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photoelectric photometer

An instrument for measuring the brightness of a star by means of the electric current produced when its light falls on a light-sensitive surface (the photoelectric effect). The light ...

photometer

photometer n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

... n . An instrument for measuring luminous intensity , older types usually involving visual comparisons of the illumination from a specified light source with that from a standard comparison source, and more modern types using photoelectric cells that generate electrical signals in response to light. photometry n . The measurement of luminous intensity , luminous flux , and related phenomena, or the branch of physics concerned with these phenomena. [From Greek phos , photos light + metron a...

Instruments of Science

Instruments of Science   Reference library

Deborah J. Warner

The Oxford Encyclopedia of the History of American Science, Medicine, and Technology

Reference type:
Subject Reference
Current Version:
2015

...and Space Administration (NASA) with help from the European Space Agency and operated by the Space Telescope Science Institute, was placed in a low earth orbit in 1990 ; it was built with a primary mirror of 2.4-meter aperture, as well as cameras, spectrographs, and photometers. Americans have been involved with astronomical photography since the 1840s and with astronomical spectroscopy since the 1860s. Notable here were the diffraction gratings produced on engines designed and constructed by Lewis Rutherfurd of New York and Henry Rowland of...

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