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The telescopes accommodate a wide variety of sensor systems, including imaging systems, conventional and contrast mode photometers, infrared radiometers, low light level video systems, and acquisition telescopes.
en.wikipedia.org The other four instruments include an optical photometer and infrared spectrometers with various spectral ranges.
en.wikipedia.org Initial light output is measured with an integrating sphere photometer, 30 seconds after the light is switched on with fresh (or newly charged) batteries.
en.wikipedia.org He also devised a specialized photometer to determine the smallest amount of light that will permit an object to be visible.
en.wikipedia.org The time of day, the circadian phase, is signalled to the pineal gland, the bodys photometer, by the suprachiasmatic nucleus.
en.wikipedia.org