Find the word definition

Crossword clues for photometer

The Collaborative International Dictionary

Photometer \Pho*tom"e*ter\, n. [Photo- + -meter: cf. F. photom[`e]tre.] (Physics) An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.


n. (context physics English) Any of several instruments used to measure various aspects of the intensity of light. vb. (context astronomy English) To measure some aspect of light (from a star) using a photometer.

  1. n. measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source

  2. photographic equipment that measures the intensity of light [syn: light meter, exposure meter]


A photometer, generally, is an instrument that measures light intensity or optical properties of solutions or surfaces. Photometers measure:

  • Illuminance
  • Irradiance
  • Light absorption
  • Scattering of light
  • Reflection of light
  • Fluorescence
  • Phosphorescence
  • Luminescence

Usage examples of "photometer".

The jump in the photometers showed that the solar blade, invisible in empty space, had traveled sideways.

At our research station, away from Edo, the company maintains radiometers, photometers, photo-polarimeters, cameras.

It carried two spectrographs, a high-speed photometer, a wide-field Advanced Charge-Coupled Device, and a fine guidance sensor.