Quote:
Originally Posted by Esteban
Who is going to set to think that the phase shift is altered, or increasing a small amount of voltage in the system, by the buried metal? This does not happen with a coil, which transmission is dispersed and of short scope. Here the light of the led, the transmitter, is concentrated more in comparison with the transmission by a coil or a common antenna.
Regards
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Hi,
IR leds... like any led stuff have epoxy container and some "cup" stuff... these things have a strong impact on e.g. aperture angle of light emitted... you can test very easy...
use an IR camera or a simple CCD one in low light ...dark room.
Power the led and point horizontal... put the camera vertical above it at 20-30cm from it... then spray around some stuff... like e.g. some deodorant spray thing.
The aerosol stuff made of thiny particles will scatter IR photons you''ll see at camera ... that way you'll see the conic shaped "beam" so the angle.
At meters this kind of propagation will make you "illuminate" several square meters of soil... cause these things are not lasers... their use is mostly for remote controls and it's good for remotes having such large diffusion of IR light, otherwise you'll have to aim the remote to the VCR/DVD thing... (like in cheap chinese stuff, very annoying !
)
If wanna a narrow spot you MUST use a laser module...
So I don't understand which concentration you're talking about ?
As always...
Kind regards,
Max