troland

troland
(Td)
   a unit used in photometry to measure the amount of light reaching the retina of the eye. The "retinal illuminance" in trolands is equal to the luminance of the light shining on the eye, measured in candelas per square meter (cd/m2), multiplied by the area of the pupil open to the light, in square millimeters (mm2). This calculation makes the troland technically equal to the microcandela (µcd), a unit of luminous intensity, but retinal illuminance is a physical quantity different from luminous intensity. The unit is named for the American experimental psychologist Leonard T. Troland (1889-1932).

Dictionary of units of measurement. 2015.

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  • Troland — Einheit Norm Einheitenname Troland Einheitenzeichen td Beschriebene Größe(n) Retinale Beleuchtungsstärke Dimensionssymbol …   Deutsch Wikipedia

  • Troland — The troland (symbol Td), named after L.T. Troland, is a unit of conventional retinal illuminance . It is meant as a method for correcting photometric measurements of luminance values impinging on the human eye by scaling them by the effective… …   Wikipedia

  • Troland — L.T., U.S. physicist, 1889–1932. See t.. * * * tro·land trō lənd n PHOTON (1) Troland Leonard Thompson (1889 1932) American psychologist and physicist. Troland was a university instructor of psychology and a practical engineer. He devised most of …   Medical dictionary

  • troland — A unit of visual stimulation at the retina equal to the illumination per square millimeter of pupil received from a surface of 1 lux brightness. * * * tro·land trō lənd n PHOTON …   Medical dictionary

  • Troland — n. family name; Leonard Thompson Troland (1889 1932), United States psychologist and physicist, inventor of most of the photographic and mechanical devices for the movies …   English contemporary dictionary

  • troland — ˈtrōlənd noun ( s) Etymology: after Leonard T. Troland died 1932 American psychologist and physicist : photon 2 …   Useful english dictionary

  • troland — n. unit in photometry for measuring the amount of light that reaches the retina of the eye …   English contemporary dictionary

  • troland — tro·land …   English syllables

  • Leonard Thompson Troland — n. (1889 1932) United States psychologist and physicist, inventor of most of the photographic and mechanical devices for the movies …   English contemporary dictionary

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