A Human Powered IR Detector

Figure 1:   A low pass (visible light blocking) filter,  that allows infrared to pass thru it unblocked.

Normally, IR is invisible to the human eye.  So, how could a person detect infrared radiation with the eye?  It can be done indirectly.  In figure 1 is the low pass visible light blocking filter known to all IR photographers.   It blocks visible light (notice that it is jet black, even when held in front of a bright lamp).

The thing is, the human eye can detect IR already.  It can detect even down to the level of upper level “far” IR!

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