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Zurich Instruments AG - Lock-In Amplifiers 4/24 LB
Photonics Dictionary

snooperscope

An instrument used for viewing in low levels of illumination by means of infrared radiation. A high-aperture lens forms an image of distant objects on the photocathode of an infrared-sensitive image tube, the visible final image being viewed through a magnifier. The scene must be illuminated with infrared energy.
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