IR source illuminates audience viewed with CCD TV camera in dark room.

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(E)Optics - E+65: Spectral Energy

IR source illuminates audience viewed with CCD TV camera in dark room. In a dark room, an infra-red LED flashlight is used to illuminate people in the audience. A small TV camera, which is sensitive to infra-red, displays one or more people using a monitor or video projector.
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E+65+0
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E+65+5 Crooke's radiometer with flashlight or IR source.