photometer

[ foh-tom-i-ter ]

noun

, Optics.

1. an instrument that measures luminous intensity or brightness, luminous flux, light distribution, color, etc., usually by comparing the light emitted by two sources, one source having certain specified standard characteristics.

photometer

/ fəʊˈtɒmɪtə /

noun

1. an instrument used in photometry, usually one that compares the illumination produced by a particular light source with that produced by a standard source See also spectrophotometer

Word History and Origins

Origin of photometer¹

From the New Latin word photometrum, dating back to 1770–80. See photo-, -meter

Example Sentences

Prof. Zenger's differential photometer that we shall finally cite is an improvement upon Bunsen's.

From Project Gutenberg

The photometer, preferably one of the Lummer-Brodhun form, is set up on a gallery or bench.

From Project Gutenberg

There is no other way of measuring the exposure than by the photometer or personal experience, and the latter is by far the best.

From Project Gutenberg

A number of measurements of the illuminating power of an electric lamp were rapidly made during the lecture with this photometer.

From Project Gutenberg

An application of the law of intensity is made in using a simple (Bunsen) photometer.

From Project Gutenberg