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“photometry”
photometry
1. The measurement of the visible portion of radiant energy (light).
2. Measuring the characteristics of visible radiation (light); such as, its luminous intensity or illuminance, relative to standard references.
2. Measuring the characteristics of visible radiation (light); such as, its luminous intensity or illuminance, relative to standard references.
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)
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“photometry”
photometry
The measurement of the luminous intensities of visible light sources which is sometimes expanded to include near-infrared and near-ultraviolet light.
Photometric devices accurately measure the intensity of light from the stars and galaxies.
They are nearly all based on highly sensitive, light-detecting electron tubes, called photomultipliers.
In these devices, weak starlight causes electrons to be emitted from the surface of a photocathode, and each electron released can be made to produce many millions of secondary electrons.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 18)