Calculate the radiation output of a thermal imaging camera?
How can I calculate the radiant power of a part in the direction of the thermal imaging camera?
In principle, I think the camera also uses the following formula:
https://wikimedia.org/api/rest_v1/media/math/render/svg/a72b04d068b19fd11a53a8529cd0e760cb5cfdc2
But what area does the camera use then?
Or: I have a Fluke Ti400 camera – how can I read the radiant power hitting the lens or per pixel, …?
Thank you in advance!
LG
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To do this, the aperture of the camera must be known. In case of doubt, you calculate the from the focal length and the F number of optics. Only photons passing through the aperture also reach the detector.
If you still know how far the camera is from the object, you can calculate the photon flow via the distance and the space angle.
hmm, I have doubts that this is possible!
Theoretically, an IR-Cam should indicate the temperature over the wavelength, INDEPENDENTLY depends on the power (per surface), which depends on the distance! However, this decreases with the Distance Act antiproportional-quadratic.
Rough. The IR camera is basically a color sensor and no brightness sensor.
For your purpose, a solar cell would possibly be usable behind an IR filter. We have to consider how to calibrate it.
hmm, doesn't a solar cell have a certain 'minimum frequency' to create a voltage at all? It would have to be a 'special' solar cell to respond to IR light. In principle, there is no difference to an IR photosensor, but because the intention is different, it is otherwise constructed.