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Electronics Forum / Electronics / December 2003long range IRDA (your opinions please)
Hi, hypothetically, do you think that I could extend the range of an IRDA unit like this one http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=3375028267&category=14 417 I'm thinking I can greatly extend the range of communications by using a telescope. Picture this: The IR receiver is carefully mounted on the eyepiece of the telescope, which is positioned to look at an IRDA device quite far away. To further extend the range, one could probably easily separate the IR transmitter diode from the emitter diode, and set up a target of multiple IR emitters, which could easily be viewed through the telescope up to a km away. With the same setup at the remote location. Do you think this will work? Would the distance achieved be only limited by the power of the telescope? I doubt there would be timing issues, as the IR is traveling at the speed of light. Regards, Phil > Hi, > > hypothetically, do you think that I could extend the range of an IRDA unit > like this one http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=3375028267&category=14 > 417 > [quoted text clipped - 13 lines] > > Regards, Phil I did not check out you link, however something worth checking (which you may already be aware of) is that the lenses used are transparent to IR. rob You'll need IR transparent plastic lenses as glass is opaque to IR, a parabolic reflector (torch reflector) with an IR filter across may do the trick nicely. Mark Harriss so why do remote controls work on DVD's & VCR's in glass TV cabinets? > You'll need IR transparent plastic lenses as glass is > opaque to IR, a parabolic reflector (torch reflector) with an IR > filter across may do the trick nicely. > > Mark Harriss > so why do remote controls work on DVD's & VCR's in glass TV cabinets? See Rod Speed's answer which is the correct one, I was thinking in terms of far IR such as that from CO2 lasers (10600 nM) which is unable to pass through silica glass to the point where a beam of a couple of watts will shatter glass immediately through thermal heating effects. At those wavelengths optics are made from crystal materials including table salt. Mark Harriss > You'll need IR transparent plastic lenses as glass is > opaque to IR, a parabolic reflector (torch reflector) with an IR > filter across may do the trick nicely. > > Mark Harriss I didn't know that glass stopped IR. Are you sure you are not talking about UV? I have an IR security camera outside which is enclosed around glass. Works OK. I dont think it is any sort of special glass. Cheers, Phil >> You'll need IR transparent plastic lenses as glass is > > opaque to IR, a parabolic reflector (torch reflector) >> with an IR filter across may do the trick nicely. > I didn't know that glass stopped IR. Only far IR which isnt what's used by remotes. > Are you sure you are not talking about UV? Nope, its true of IR too. > I have an IR security camera outside which is enclosed around glass. > Works OK. I dont think it is any sort of special glass. Because thats near IR. |
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