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illuminometer
A photometric instrument used to measure the illumination falling on a surface. It may be photoelectric or visual.
Lummer-Brodhun cube
A photometric instrument having two prisms clamped in optical contact to produce a photometric field with an acute dividing line.
multianode microchannel array detector
A photon-counting instrument for use in both space-borne and ground-based photometric and spectroscopic instrumentation. This style of detector is composed of opaque photocathodes for photon to...
photometric equipment
Photocells of various kinds used to measure photometric quantities; i.e., intensity, luminance and illuminance. Meter readings are used to express illuminance and, by calibration, to measure...
photometry
Photometry is the branch of science that deals with the measurement of light, particularly in terms of its intensity and the way the human eye perceives it. It involves the quantification of visible...
spectrogrammetric reading equipment
Spectra can be conveniently recorded on photographic film or plates. The portions that are occupied by regions of the recorded developed images on the film or plate can be determined with some...
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