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photometer
(redirected from illuminometer)

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photometer

Instrument that measures the intensity of light (electromagnetic radiation in the visible range), usually by comparing relative intensities from different sources. Bunsen's grease-spot photometer of 1844 compares the intensity of a light source with that of a known source by using each source to illuminate one half of a translucent area. Modern photometers use photocells, as in a photographer's exposure meter. A photomultiplier can also be used as a photometer.
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Finally, during the investigation of an officer-involved shooting, police administrators should document the lighting level at the time of the incident with an illuminometer and consult a vision expert with experience in this area.
Visual perception in low-light levels by Michel, Paul / The FBI Law Enforcement Bulletin
 
 
 
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