Heritage Steam Engine Azad -- (WP 7200)

101th BLOG POST -->>

Heritage Steam Engine Azad

Heritage Steam Engine Azad... This was 3rd meeting to this Engine at two different places. As it was brought to India in 1947, the year of independence, it was named AZAD.  A commemorative run of iconic steam engine WP-7200 popularly known as Azad, Steam powered locomotives were Indian Railways’ go to option in the 60s and 70s before diesel and electric variants were introduced. A total of 755 steam engines of the WP class were built for the Railways between 1947 and 1967 and designed specially to feed on Indian coal varieties. In world Steam Engine is known as the king of inventions.... First meeting was at New Delhi during 63 rd railway week exhibition. Watched all inside function... Yet I've watched Coal furnace in movies and now checked it. In summer day’s not easy to operate. When I was curious to know about furnace then Train Operator opened once. Now the ride is open to public and the charges are nominal at Rs 10.

Inside Operating Function Of Engine

Indian Railways ran its first passenger train on 16th April, 1853, between Bombay (Bori Bunder) and Thane, a remarkable day in the history of the nation heralding the dawn of speedy long distance locomotion in the country. Over time by linking major cities and far-flung locations through the challenging hilly terrain and adverse climatic conditions, the Railways created its own metaphor of existence and rapidly evolved as a mass transportation mode of men and material and earned the distinction of the “Lifeline of the Nation”. Once the mode of haulage over Indian Railways the Steam Engines were slowly phased out and replaced by Diesel and Electric locomotives. It is a matter of pride that some steam engines still run on the 5 spectacular Hill Railways.

Small Video Of Heritage Steam Engine Azad

In the late 1920s, after years of manufacturing non-standardized and British standard locomotive designs, the Indian Railways came up with their own set of design specifications. These Indian Railway Standard or IRS designs were made post World War I, for the Indian Government by British consulting engineers.  

Coal Furnace for Heat 

The classifications were done as follows - X and W class (for broad gauge locomotives), Y class (for meter gauge), Z and N class (for narrow gauge). Of these, all broad gauge locos have been completely withdrawn from service, with the exception of steam specials like Angadh, Akbar, and Azad, currently housed at Rewari Heritage Steam Loco Shed.

In the mid 1940s, after World War II, upon experiencing a shortage of locomotives in the system, Baldwin Locomotive Works (BLW), Philadelphia, USA, was awarded the task of building the first sixteen prototype WP class locomotives. These were numbered from 7200 to 7215 and went to Great Indian Peninsular Railway, Bombay Baroda & Central India Railway and East Indian Railway. The initial locos were called WP/P, the extra P indicating prototype. After being taken off service in May 1987, it received a full overhaul at the Amritsar Railway Workshop in April 2015. 

With the British manufacturing works diverted towards the war, American manufacturers got headway in the locomotive market in India. It was well suited as the American designs were not only lighter and faster, but also this class was specifically designed for the low-calorie, high ash Indian Coal. The WP design hence marked a new era of locomotives, marking the change from X to W as classification code. As opposed to bulky, British models, the WPs were a much lighter and faster class of locomotives. All WP class locomotives can be easily recognised by their standard cone-shaped bulging nose, usually with a silver star painted on it. The American WP locomotives were made on bar frames instead of the plate frames used by the British manufacturers. This reduced the weight of the locomotive considerably.

WP-7200 Class 

It is believed that WP-7200 was the first WP class of engine that was handed over to Indian Railways, on the 15th of August 1947, India's Independence Day, inspiring them to name the locomotive Azad.

On 15th September 2018, Azad also became the chosen locomotive to run the first ever time tabled, weekly steam service between Farukh Nagar and Gadi Harsaru, in Haryana. It had been a long standing demand of the people of Farukhnagar to have a train service on Sunday. Using a steam engine for this service is an attempt to fulfil not only that demand but also boost tourism related activities and attract steam enthusiasts from all over the world to visit these places.

Coal Storage 

A railway worker shovels coal into the grate. The giant engine has a capacity to hold around 25,000 litre of water and 15 tons of coal and can run at a speed of 100 kmph.

It will be the first time in nearly 25 years, since the last steam engine ran on the Indian Railways that such a weekly service in steam is being made available. For Azad, this will be a new lease of life since being withdrawn from service 30 years ago, in May 1987. The locomotive has been restored to its pristine beauty and mechanical engineering perfections. This locomotive can run up to 60 miles per hours. Now major repair works have been done to revive the locomotive and shall be run on mainline. Its revival has been carried out at Heritage Steam Shed in Rewari in keeping with the insistence of the minister for Railways, Piyush Goyal, in reviving tourism and preserving railway heritage,” said Arun Arora, the principal chief mechanical engineer of Northern Railway.

Wheel Arrangement with Hollow Space

It is a typical British design, easily distinguishable because of its heavy plate frame, on which all the other running parts are bolted. This makes the structure, bulky and quite slow. Another significant design element of this locomotive is the wheels. They are solid, heavy with bulky spokes. This again, adds to the overall weight of the locomotive. They have a 4-6-2 wheel arrangement. The wheels were made of two plates joined at the edges, leaving a hollow space between, making the wheels lighter than those in the British models. Some rail enthusiasts also prefer its softer visual aesthetics over the others.

  Azad in particular has even appeared in various movies, one of them being Aamir Khan starrer Rang De Basanti, Guru and Rifle man Jaswant Singh Rawat.

See more pics on following link https://www.instagram.com/p/BpCXEtZj2VY/

YouTube: https://www.youtube.com/watch?v=afqTs8tgT14

Thanks
Parveen Kumar Sahrawat

Surrogacy - Priceless Act On The Part of A Surrogate Mother

99th BLOG POST -->>

In last two weeks, there were two different news about surrogacy. The Maternity Benefits (Amendment) bill passed by the Rajya Sabha on 20 March in which some acts are changed related to surrogacy. Second news was from our film industry that a film maker get twins. Two or three years ago, surrogacy was a big topic of discussion. Although surrogacy has existed since ancient times, it does not seem to have been a popular practice among childless couples to formally seek out a surrogate. In ancient time, no surrogacy medical technique was introduced so that time did not require the actual consummation of the sexual act.

As science is boon as well as curse . Now medically advanced techniques are available. Artificial insemination opened the way to traditional surrogacy. The surrogate mother is impregnated with the sperm of the intended father. The surrogate mother is also known as the genetic mother. Surrogacy is not an accepted procedure in many countries, although some are more lenient towards altruistic surrogacy. Some countries strictly prohibit commercial surrogacy. In some country it becomes business and in India it is a fast growing business. India is increasingly becoming a sought after country for surrogate mothers. Surrogacy was legalized in India in 2002. It became popular in 2003 when a Doctor successfully delivered a surrogate child through gestational surrogacy using the genetic grandmother as a surrogate mother. 

The dictionary meaning of “surrogate mother” is a woman who bears a child on behalf of another woman, either from her own egg fertilized by the other woman's partner, or from the implantation in her uterus of a fertilized egg from the other woman.

According to a health agency, some 12% of women of reproductive age have trouble getting pregnant or carrying a pregnancy to term. While fertility treatments are evolving, some aspiring mothers' best option especially if they don't have eggs or their eggs are unhealthy is to work with a surrogate who becomes pregnant using the would be mom's chosen sperm and the surrogate's own egg.

I am constantly amazed at the strength, resilience and determination of these women. They are supporting women through infertility. In such women you can see their endless capacity to love and care for their surrogate baby. Such women are grateful for those she is carrying baby. A good ideology behind this is that “maybe you can not change the world but you can give the world to someone and change their life.” Good point is that women felt so privileged to be able to do this. Such women fulfill the happiness of another couple. She felt in a very real way that she had made their happiness possible. It will be a very different feeling from having her own child. May be she felt like she was simply returning the baby that they had given her to care for nine months.

I was watching some episodes related to surrogacy. Words can't describe how they felt when they saw the intended parents catch the first glimpse of their newborn son nor can they describe the completeness I am sure they felt that day. There truly is no greater gift a woman can give. Surrogacy is essentially a giving, fulfilling, and priceless act on the part of a surrogate mother. This privilege of feeling as a giver is articulated and emphasized in some contexts, but is taken away in other contexts such as India, where a surrogate mother is simply left with a feeling of being just a receiver.

            While writing this post I was come to know that there are several ways you can find a surrogate mother. You can ask your friend or relative to be a surrogate for you. It's somewhat controversial. And in Indian society it is high controversial because of several Ceremony and social represents.  But in developed and European country you can find surrogacy agency. There are several agencies operating in the United States. They act as go-between. An agency helps you find a surrogate and make arrangements. It also collects fees that get passed between you and the surrogate, such as paying for her medical expenses.

            To choose a surrogate one need to follow the law instructions which is based on the medical checkup. There are some parameters for women like as surrogate should have at least 21 year old who has already given birth to at least one healthy baby so she understands firsthand the medical risks of pregnancy and childbirth and the emotional issues of bonding with a newborn. Signs a contract about her role and responsibilities in the pregnancy, such as prenatal care and agreeing to give you the baby after birth

            Legal Aspects of Surrogacy in India is different from Europe. You can only approach a close relative for surrogacy. Commercial surrogacy in India was legal but now the government approved a Bill that bans commercial surrogacy, and bars married couples who have biological or adopted children, single people, live-in partners and homosexuals from opting for surrogacy. Surrogacy will be allowed only once. The bill effectively bans foreigners to seek an Indian surrogate mother. This includes non-resident Indians (NRIs). An important change is that If you're a heterosexual married couple who have proven infertility, and you find someone who agrees to be a surrogate mother, you can't pay her. You can pay for any and all of her medical bills, but that's all. Now I should stop writing. Many points are available to discuss about surrogacy. Again will meet after a break.

Thanks

Parveen Kumar Sahrawat

Engineers are Versatile: Engineers Can Change The World....!!

97th BLOG POST -->>

Happy Engineers Day 

The discipline of engineering is extremely broad, and encompasses a range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied science, technology and types of application. An Engineer can be Plumber, Electrician, Carpenter, jamidaar, doodhwala but not vice versa. Engineering is one of those studies in which you end up understanding people and life more than your syllabus.

 Engineering is the science, skill, and profession of acquiring and applying scientific, economic, social, and practical knowledge, in order to design and also build structures, machines, devices, systems, materials and processes. This is how Internet defines Engineering. I remember how I discomfort when first time I looked at my Science, Mathematics and numerous books after getting admission in 11th under Science stream. That was the exact moment I choose non-medical when I decided "I'm going to be an Engineer ever". Before my aim was to be a doctor like my father but due to less no interest in biology I left medical side and also in my school there was no one interested in biology except a girl. My father kept me to study for non-medical stream and I score respectable marks in first division to get an institute.

So it's Engineer's Day now. A day meant for all the geniuses who keep on working hard, inventing, researching and developing incessantly without any interruptions and failures. The world would have been a big void if Engineers would not have contributed their piece of mind to it. It has been a very proud moment to see that our country- India has produced many Engineers in last few years who have managed to amaze us every time they came up with something new. Engineering is the reason behind many inventions and creations. Every human made object has engineering involved in it. The bike, car or bus you ride, the washing machine that you use, the vacuum cleaner with which you clean your house, the mobile that you operate, the television that you see, the mobile through which you connect with your old and long-distance friends- All are the results of magnificence shown by the engineers.

Engineering is quite different from science. Scientists try to understand nature. Engineers try to make things that do not exist in nature. Engineers stress innovation and invention. To embody an invention the engineer must put his idea in concrete terms, and design something that people can use. That something can be a complex system, device, a gadget, a material, a method, a computing program, an innovative experiment, a new solution to a problem, or an improvement on what already exists. Since a design has to be realistic and functional, it must have its geometry, dimensions, and characteristics data defined. In the past engineers working on new designs found that they did not have all the required information to make design decisions. Most often, they were limited by insufficient scientific knowledge. Thus they studied mathematics, physics, chemistry, biology and mechanics. Often they had to add to the sciences relevant to their profession. Thus engineering sciences were born.

Engineering has existed since ancient times as humans devised fundamental inventions such as the wedge, lever, wheel, and pulley. Each of these inventions is essentially consistent with the modern definition of engineering. As with all modern scientific and technological endeavors, computers and software play an increasingly important role. As well as the typical business application software there are a number of computer aided applications (computer-aided technologies) specifically for engineering. Computers can be used to generate models of fundamental physical processes, which can be solved using numerical methods.

It's a real proud moment to have so many friends who are Graduates in Engineering. It's very easy to say "Aaj kal toh sadak pe ghumta har ek banda Engineer hai" but it's very hard to earn the degree. Everything seems to be fun and frolic from distance but the one who is in the process of getting sharpen up for a bring future knows the struggle and obstacle in the journey. I have done Bachelors in Information Technology. I found it very easy as my University was MDU. But when I was landed up into a renowned-MDU University for Bachelor of Technology (B.Tech.), I have started going through the pain of what a Graduation of any field goes through. Before that day, whenever I found any friend with a degree of B.Tech, a respect never came from within. But being in the First semester itself (of B.Tech), I have started respecting all the geniuses who have passed out their Graduation with respectable marks. And thus, I know now what a student goes through in an Engineering college where once faces continuous tortures, assignments, projects and I don't know what what....!!

I Salute the Dedication & Service of all courageous peoples who consistently work for make our life easier. A Very Happy Engineer's Day to all the Engineers of the world and to hit the bird's eye, I would like to wish all my friends (whom I know personally) who have successfully held their Engineering's Degree on their respective Convocations. It's a real proud moment to have so many friends who are Graduates in Engineering. 

Thanks

Parveen Kumar Sahrawat

Technology Evolution, Social Media Connectivity, Chit Chat and Celebrity ....!!

95th BLOG POST -->>

With my birthday I’ve completed 8 years of joining RSS. On this birthday I was at home. Generally I’m not celebrating birthday like other friends. But on this special day I’m always trying to make some special recipe and always enjoying cooking. This time I make Aloo Tikki using bread, Pread Pakoda and Toast for my family.

This time received some special birthday wishes from the legend bollywood Actor, Padma Shri & BJP MP Mr. Paresh Rawal Ji.  He wrote birthday wishes as “Work hard n makes your parent proud... Happy birthday n God Bless you”. Can’t imagine such moment of receiving birthday wishes form bollywood actor. Another best thing is that he is following me on Twitter since from 25 December, 2015. We are following to each other and can send direct message to each other.

Actor, Padma Shri & BJP MP Mr. Paresh Rawal Ji

He won the National Film Award for Best Supporting Actor for his performances in the films Woh Chokri and Sir. First I was come to know about his move Sir when I asked him that “Sir first time listened about this movie ‘Sir’. This film/movie is special to you??” Then he replied that "it’s directed by Mahesh Bhatt and starred by Naseer Bhai n Puja Bhatt… that’s all. Then I say only yeah truly... Mahesh Bhatt & Naseer are awesome ‘Zakham’ is one of Mahesh Bhatt’s most down to earth works to date. Currently he is working in the biopic of Indian PM Shree Narendra Modi Ji who is the icon of development for Indian. He is always saying that “Development should be made a mass revolution, in the history of INDIA there were many leaders who gave their lives for the nation and fought for freedom in groups of 10s and 100s. But its Gandhi who has made the freedom movement to a mass revolution – with the things they do in everyday life – connects these actions with freedom movement.” Sir best wishes for upcoming biopic, and will be interesting to see your chemistry and dialogue & waiting for release of movie. 

Bollywood actor and producer Sanjay Kapoor is also good in communication with their fans. He is not active on social media. But he is always online on WhatsApp. Sometimes I’m texting him on WhatsApp related to review of movies only. In today generations, it’s possible only because of Technology.

Vanessa Martini during a Movie Shot

Over social media Hollywood Actress and Producer Vanessa Martini also have good conversations. She is well known for her role in Party Betchez, Road to Redemption and executive producer of Once upon a Night movie. When I searched her on Google then I was little confused that she is Germany based actress or elsewhere. I asked her are you Germany based? She replied – lol I live in Los Angeles and working with an international director so there's stuff written about me all over. I’m impressed with her quick response. Even have more conversations with her. It’s enough for this post.

And received 2^nd from Deputy Advocate General at Government of Haryana Mr. Raj Kumar Makkad Ji. It is always interesting to interact with Raj Kumar Ji on social issues. First time I was meet him during RSS camp in March, 2008 at Loharu. At that time he was Advocate at bar council, Bhiwani. Now a day he is living at Chandigarh. He is good at singing.  Generally I’m receiving inspirational social message from him on WhatsApp. “Badon ka aasheervaad ave preranaadaayee shiksha hamesha aage badhane ko protsaahit karatee hai, aapake preranaadaayak maisej tatha janmadin kee shubhakaamanaon ke lie bahot bahot dhanayavaad. Mera saubhaagy raha hai ki pahalee hee shaakha main aap kee aur Ravi Kumaar Ji ki ungalee pakad kar chalane ka saubhaagay mila hai”

DAG at Haryana Govt. Mr. Raj Kumar Makkad Ji

Also received some good birthday message from unknown persons on social media, Monica Sharma write “happy birthday…best wishes”. Mr. Dipesh Bothra writes "that's most important makes your parent’s proud society n country will automatically be… Happy birthday.” Mr. Krunal writes “nice blessing sir ji warna aaj kal to kanaiya kumar ki tarah protest karo aap fukat mein khilayega.”  And at last it was nice to talk them on various issues of politics, national issues and social issues.

At last I’d like to thanks again for sweet birthday wishes.

Thanks J

Bharat Mata Ki Jai

Parveen Kumar Sahrawat

Simply Baaten With National Conference Moments....!!

90th BLOG POST -->>

Receiving My Certificate Of Publication

Last month on 29^th march was my birthday. On that I get so many birthday wishes. This time BJP Haryana media spoke person Mr. Hritik Wadhwa also send me birthday wishes. He is a cool person like as Indian captain cool MS Dhoni. I was meeting him some months ago in Bhiwani at his office. I’m not celebrating my birthday too much like others. So this time also birthday was like a normal day but whole day I was busy in doing some creative work. At night time I was busy in preparing the notes for national conference.

After a long time again I play a prank with Preeti. Actually the idea of prank was come when I was discussing on some matter with my friend Mr. Rakesh Baloda and Mr. Alok Bhardwaj ji. After spending a quality time of lectures we were travelling on bike. We were talking about spending moments in campus. For this prank Urmila give me support. Thaks Urmila ji… :-) I’ve no words for Preeti. She is so kind hearted. I can’t explain how much you are so sweet. Even I was saying you. Your voice is like a nightingale. Every word you utter is sweet. I think it’s a genuine comment for you.

Life is changing its phase like as sometimes it’s becoming happier or sadness. It’s only because of thoughts and its process. Our living environment always changes magnitude of mood and the proficiency with which the mind works. It is not what you have but it is how you think has a profound effect on your life. If possible we should enjoy every moment of life. Because zindagi na milage dobara. All of us should always subjective to ourselves and then the people around us. A race is always there in life. I prefer the one with myself. Whatever happens to me is by what happens with me. I’m telling you a motivational quote that I’ve read somewhere: "Be sure that you appreciate everything you've got; and be thankful for the little things in life that mean a lot." I remember some best words as given below:

Koi bhi cheez duniya main rehti nahi

Aaj main hoon jahaan kal koi aur thaa

Aaj main hoon jahaan kal koi aur thaa

Ye bhi ek daur hai woh bhi ek daur tha…!!

I participated in National Conference on Innovative Trends in Computer Science Engineering ITCSE-2015 on 4th April 2015 held by International Journal of Recent Research Aspects ISSN: 2349-7688. My research paper was selected for publication on the topic Li-Fi: Future of Wireless Comunication.  National Conference was addressed by Guest of Honor Dr. B.K. Kaushik, Associate Professor in Department of Electronics and communication engineering at Indian institute of technology, Roorkee and Chief Guest Dr.Nasib Singh Gill, Professor and Head at Department of Computer Science and Applications, MDU, Rohtak. I was impressed from his shahyari. He gave inspirational speech about technologies with his some shahyari. Here I’m posting one of his best shahyari.

Soch Ko Badlo, Sitaare Badal Jaayenge
Nazar Ko Badlo, Nazare Badal Jaayenge
Kastiyaan Badalne Ko Kaun Kehta Hai?
Dishaon Ko Badlon Kinare Badal Jaayenge

In national conference the best speech was given by Dr. B.K. Kaushik about make in India and also about the quality research requirements of DRDO. He was praising of Mr. Narendra Modi for his vision. I think NarendraModi is right to invite Foreign Companies to manufacture in India so that the countrymen can have employment using their skills. Come, make in India," Prime Minister Narendra Modi exhorted the world in his maiden Independence Day address, inviting global firms to set up manufacturing bases as part of his biggest push to fix in one go multiple economic problems including low employment creation, slow economic growth and high trade deficit. India's manufacturing activity contracted 0.7 per cent in 2013-14, the first time since 1991-92, dragging overall economic growth down to sub-5 per cent for the second consecutive year.

Reviving manufacturing is the biggest challenge for the government as the high inflation has kept interest rates high, impacting investments and demand. We should dream of 'Made in India' products across the world. We need to encourage the manufacturing sector. We need to channelize the strength of the youth through manufacturing.  Manufactured goods should have zero defects as also zero effect on environment.

We should strive to be a nation that doesn't import, but exports. In one speech Narendra Modi was saying that “I urge youth to reduce dependence on imported products." He is right, we should think about it. Today Indian youth power can play a best role in every field. Dr. B.K. Kaushik, Associate Professor in Department of Electronics and communication engineering at Indian institute of technology, Roorkee was also saying about this point. He give the best example of china for this purpose. Hindustan phir se Golden Sparrow ban sakta hai. We can be superpower in the world. But for this we need to use resources carefully. 

Industry chambers hailed Modi's vision as path-breaking and visionary. CII i.e. Confederation of Indian Industry is happy to see high importance attached to manufacturing and investment. As PM said, manufacturing is necessary for employment and for trade expansion. Come, make in India - what an inspiring statement….!! In order to achieve this, the government would need to address issues such as taxation, including introduction of the GST (Goods and Services Tax), land acquisition, faster approvals, trade policy, etc. The government has initiated a drive over the past ten months to improve business climate, streamlining application clearance mechanism.

Making India the manufacturing hub will also mean higher exports from the country and lower imports, reducing the trade gap. "We are now confident that the 'Makein India' and 'Made in India' vision will be supported by requisite policy and implementation measures for enhancing the competitiveness of our manufacturing sector," said Ficci president Sidharth Birla.

          Now I think you are boring because there is nothing much interesting like a romantic love story in reading the technical part of this post. Perhaps all of you are reading in newspaper as well as listening and watching on news channels. 

Thanks

Parveen Kumar Sahrawat

Any Sufficiently Advanced Technology Is Indistinguishable From Magic....!!

87th BLOG POST -->>

How Li Fi Works

Here we are meeting first time in 2015. Last year was only for travelling to different places of Rajasthan, Haryana and Delhi. One of the best moment was of Surya Foundation Trip with 70 friends belong to all over India means of different state. In Surya foundation, many compilations were organized which were very helpful. During that camp I get a chance to give speech on a topic. And also participated in many events in a week. Rest about the participated related task I will talk in next blog post. I promise I’ll post in coming days so ready of that post.

Today I want to post a technical post. Perhaps it will be first time I’m going to post technical information. Today technology changed per day. Every day I try to learn something special from technologies. But we get knowledge’s about these technical topics then we not get such platform where we present our technical skill. But I was in this case; I get 7 days to represent some knowledge of information technology in a school and after that one day in seminar. Where I choose a technical topic for seminar was Li-FI Technology. I am sure most of you reader don’t know about this technology. When in seminar hall I say Li-FI Technology, for a moment in seminar hall sanata cha gya….!! What you say… ye kya hota hai … etc etc. Even I think here also such questions were come in your mind. Below I’m giving some information related to this technology.

        Whether you're using wireless internet in a coffee shop, stealing it from the guy next door, or competing for bandwidth at a conference, you've probably gotten frustrated at the slow speeds you face when more than one device is tapped into the network. As more and more people and their many devices access wireless internet, clogged airwaves are going to make it increasingly difficult to latch onto a reliable signal. But radio waves are just one part of the spectrum that can carry our data. What if we could use other waves to surf the internet?  For all this we’ve a solution calls “Data Through Illumination”—taking the fiber out of fiber optics by sending data through an LED light bulb that varies in intensity faster than the human eye can follow. It’s the same idea behind infrared remote controls, but far more powerful.

       Li-Fi is now part of the Visible Light Communications (VLC) PAN IEEE 802.15.7 standard. Li-Fi is typically implemented using white LED light bulbs. These devices are normally used for illumination by applying a constant current through the LED. However, by fast and subtle variations of the current, the optical output can be made to vary at extremely high speeds. Unseen by the human eye, this variation is used to carry high-speed data. In simple terms, Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information. Since simple light bulbs are used, there can technically be any number of access points.

Li-Fi is typically implemented using white LED light bulbs at the downlink transmitter. These devices are normally used for illumination only by applying a constant current. However, by fast and subtle variations of the current, the optical output can be made to vary at extremely high speeds. This very property of optical current is used in Li-Fi setup. The operational procedure is very simple-, if the LED is on, you transmit a digital 1, if it’s off you transmit a 0. The LEDs can be switched on and off very quickly, which gives nice opportunities for transmitting data. Hence all that is required is some LEDs and a controller that code data into those LEDs. All one has to do is to vary the rate at which the LED’s flicker depending upon the data we want to encode. Further enhancements can be made in this method, like using an array of LEDs for parallel data transmission, or using mixtures of red, green and blue LEDs to alter the light’s frequency with each frequency encoding a different data channel. Such advancements promise a theoretical speed of 10 Gbps – meaning one can download a full high-definition film in just 30 seconds.

Working Technology of Li Fi

Light is inherently safe and can be used in places where radio frequency communication is often deemed problematic, such as in aircraft cabins or hospitals. So visible light communication not only has the potential to solve the problem of lack of spectrum space, but can also enable novel application. The visible light spectrum is unused; it's not regulated, and can be used for communication at very high speeds. Wi-Fi and many other radiation types are bad for sensitive areas. Like those surrounding power plants. But power plants need fast, inter-connected data systems to monitor things like demand, grid integrity and (in nuclear plants) core temperature. The savings from proper monitoring at a single power plant can add up to hundreds of thousands of dollars. Li-Fi could offer safe, abundant connectivity for all areas of these sensitive locations. Not only would this save money related to currently implemented solutions, but the draw on a power plant’s own reserves could be lessened if they haven’t yet converted to LED lighting.

The possibilities are numerous and can be explored further. If his technology can be put into practical use, every bulb can be used something like a Wi-Fi hotspot to transmit wireless data and we will proceed toward the cleaner, greener, safer and brighter future. The concept of Li-Fi is currently attracting a great deal of interest, not least because it may offer a genuine and very efficient alternative to radio-based wireless. As a growing number of people and their many devices access wireless internet, the airwaves are becoming increasingly clogged, making it more and more difficult to get a reliable, high-speed signal. This may solve issues such as the shortage of radio-frequency bandwidth and also allow internet where traditional radio based wireless isn’t allowed such as aircraft or hospitals. One of the shortcomings however is that it only work in direct line of sight. There are so many applications of this technology and even this technology is used in developed country. Rest of large information you can find out on internet. I think it’s enough to understand the basic of this technology. 

Thanks

Parveen Kumar Sahrawat