Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An instrument for measuring a property of light, especially luminous intensity or flux.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of several instruments used to measure various aspects of the intensity of light.
  • v. To measure some aspect of light (from a star) using a photometer.

from the GNU version of the Collaborative International Dictionary of English

  • n. An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.

from The Century Dictionary and Cyclopedia

  • n. An instrument used to measure the intensity of light, specifically to compare the relative ! intensities of the light emitted from different sources.
  • n. In photography, a device for determining the proper length of time for exposure. See actinometer.
  • n. An instrument for determining the length of time proper for photographic exposures.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. photographic equipment that measures the intensity of light
  • n. measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source

Etymologies

photo- + -meter (Wiktionary)

Examples

  • To accomplish this mission, a space-based photometer is being developed that employs a 0. 95m aperture Schmidt telescope coupled to a very large focal plane array (FPA) measuring 14” (L) x 14” (W) x 10” (D).

    Kepler Is On Its Way - NASA Watch

  • If the photometer were analog, you could remove the cover and feel the position of the needle.

    Carry-Over Thread

  • Anyone who wants to make sure their sunglasses have adequate protection can have them tested by a machine called a photometer in an ophthalmologist's or optician's office.

    Dr. Rock Positano: Sunglasses Are More Than A Fashion Statement

  • An instrument for measuring the strength of a light is called a photometer, and there are many different varieties, just as there are varieties of scales which measure household articles.

    General Science

  • Munsell photometer, which is briefly referred to, is an instrument of wide range, high precision, and great sensitiveness, and permits the valuations which are necessary in his system to be accurately made.

    A Color Notation A measured color system, based on the three qualities Hue, Value and Chroma

  • It's fitted with a specially-designed telescope called a photometer or light meter designed to detect small variations in the brightness of stars.

    CNN.com

  • The mission's science instrument, called a photometer, contains the largest camera ever flown in space -- its 42 charge-coupled devices (CCDs) will detect slight dips in starlight, which occur when planets passing in front of their stars partially block the light from Kepler's view.

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  • The mission's science instrument, called a photometer, contains the largest camera ever flown in space - its 42 charge-coupled devices (CCDs) will detect slight dips in starlight, which occur when planets passing in front of their stars partially block the light from Kepler's view.

    Universe Today

  • The mission's science instrument, called a photometer, contains the largest camera ever flown in space -- its 42 charge-coupled devices

    SpaceRef Top Stories

  • Its instrument is a specially designed telescope of 0.95 meters in diameter which is called a photometer or light meter, the largest ever flown in space.

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