electronics
why cant we use a IR rays for transmiting signals

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sarat kumar s g

 

i don't see why not

take a look at http://www.epanorama.net/links/irremote.html and you'll find some examples, it is quite simple.

Some mobile phones have IR on board, mine has and I can communicate with my laptop which has an IR port as well

It is not used much however because it is quite slow

regards, Jef

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thank u for sending reply about what i asked can u send some information regarding UV rays

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sarat kumar s g

 

that,s physics, don,t know what i could explain about that, check google for it

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ok
thank u sir i am happy in receiving reply from u
ok sir i am an engineering student electronics

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sarat kumar s g

 

Wavelegth limits IR to certain Fiber optic cables, IR though the air is short distances only, expensive to implement large systems to travel IR over wide areas, IR is line of sight.

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I'm guessing you meant to ask why aren't UV rays used for transmitting instead of IR.

UV is higher energy than visible spectrum, while IR is lower. UV can potentially damage the eye if stared into at close range (kids). UV takes more power to drive. UV LEDs are only recently available (5 yrs or so), much more expensive than IR, and there are no cheap UV receivers.

 

UV has about the same constraints. UV transmits faster. You would not want to uses it to transmit though the air.

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