detecting heat with IR LED receiver

[harp]

detecting heat with IR LED receiver

I have some dark IR led, and want to know if it is be situable to detect pure heat (not visable glow ir radiation) in well lighted desk?

So, if I put hand over it in near distance like few centimeters, that detect rising heat, not covering it from light.
Something like termal camera, but in one spot, any simple circuit?

[eccerr0r]

Re: detecting heat with IR LED receiver

Those IR sensors are of the wrong wavelength and won't work very well if at all.

Non-contact "laser" thermometers are basically what you're looking for - one spot heat detector.

[redwire]

Re: detecting heat with IR LED receiver

The human body emits far IR around 12 micron wavelength, 36°C strongest at 9.4μm. This is far away from any photodiode or phototransistor's response.
A Pyroelectric Infrared Sensor does detect it but only if it is moving.

[harp]

Re: detecting heat with IR LED receiver

Yes I know for pir sensor, but dont have some...
I read the article seamlessly it is very informative, I didnt know that pir sensor is type of cheramic, and how act to bring sensing to meter, it is some sort of "capacitor"...

I found that is very common using regular diode as temperature (ambient) sensor, due to characteristic of changing properties depends on it, about 2mV/C
so, I think, that some properties will also changd in ir receiver led if it is exposed to heat radiation. But cant measure and get any clear conclusion beside of light depend properties even in this dark package... The diodes was desoldering from vhs video, from tape end detecting.