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“photometer”
photometer
1. An instrument used in measuring the intensity of light, especially in determining the relative intensity of light from different sources.
2. A device for measuring the intensity of infrared, ultraviolet, or visible light.
3. A device for testing the sensitivity of the eye to light by determining the light minimum.
2. A device for measuring the intensity of infrared, ultraviolet, or visible light.
3. A device for testing the sensitivity of the eye to light by determining the light minimum.
This entry is located in the following units:
meter-, metro-, metr-, -metrical, -metrically, -metron, -metric, -metrist, -meter, -meters, -metry, -metre
(page 31)
photo-, phot-, -photic
(page 11)
Word Entries containing the term:
“photometer”
electronic photometer, photoelectric photometer
A photometer (instrument used for making measurements of light or electromagnetic radiation, in the visible range) which uses a photocell, a phototransistor, or a phototube to measure the intensity of light.
This entry is located in the following units:
electro-, electr-, electri-
(page 67)
-tron, -tronic, -tronics +
(page 11)
sphere photometer, integrating-sphere photometer
An instrument for measuring the total luminous flux of a lamp or luminaire; the source is placed inside a sphere whose inside surface has a diffusely reflecting white finish, and the light reflected from this surface onto a window is measured by an ordinary photometer.
visual photometer
A photometer (instrument for measuring light intensity) in which the luminance of two surfaces is compared by human vision.
This entry is located in the following unit:
vid-, video-, vis-, -vision, -visional, -visionally, visuo-, vu-
(page 17)