what r IR leds used 4?
- Thread starter Miracle
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TORCH_BOY
Flashlight Enthusiast
They are used with night vision cameras, door detector beams ect
bexteck
Enlightened
Two things come to mind right away. Almost all remote controls use IR LED's to send a signal to the device they control. Also, IR LED's are sometimes used with night vision or security cameras since they will see the IR light, but it will not be visible to the naked eye.
bexteck
Enlightened
Looks like TorchBoy beat me by a few seconds.
Pretty much every electro optical system that doesn't have to be visible. IR LED's are cheaper than visible ones and nicely match the sensitivity of common detectors, so IR is usually first the choice.
Examples (cribbing some from above to keep the list complete):
Remote controls
Opto isolaters (isolates two sections of a circuit by optically coupling a signal from one section to the other)
Position sensors (industrial, inside VCR's, etc.)
Beam break detectors (industrial control, safety interlocks, security systems)
Optical scanners (grading "fill in the dot" sheets, etc.)
Fiber optic communications (short range; long range uses semi-conductor lasers)
And, since semiconductor lasers are specialized LED's, you can add long range fiber optic communications, pump lasers for other colors, etc.
And, as pointed out above, they can also be used to hide illumination from people, either for covertness or to avoid distraction, when used for lighting or signalling.
Cheers,
Bob
Examples (cribbing some from above to keep the list complete):
Remote controls
Opto isolaters (isolates two sections of a circuit by optically coupling a signal from one section to the other)
Position sensors (industrial, inside VCR's, etc.)
Beam break detectors (industrial control, safety interlocks, security systems)
Optical scanners (grading "fill in the dot" sheets, etc.)
Fiber optic communications (short range; long range uses semi-conductor lasers)
And, since semiconductor lasers are specialized LED's, you can add long range fiber optic communications, pump lasers for other colors, etc.
And, as pointed out above, they can also be used to hide illumination from people, either for covertness or to avoid distraction, when used for lighting or signalling.
Cheers,
Bob
idleprocess
Flashaholic
Miracle said:
You will need a thermal imaging device to see something like that. Thermal imaging devices operate at much lower wavelengths than the most common IR LEDs which are techically "near IR" and typically barely visible to the naked eye.
Shining near IR on something that's absorbed heat from something (like a bare foot) won't do much anything.
Sub_Umbra
Flashlight Enthusiast
Some elite military units use IR Photon Freedoms in 'strobe mode' to mark LZs, etc.
Sub_Umbra
Flashlight Enthusiast
Sorry,
LZ = Landing Zone
