transmissometern.
/trɑːnzmɪˈsɒmɪtə//tranzmɪˈsɒmɪtə//trɑːnsmɪˈsɒmɪtə//transmɪˈsɒmɪtə/ An instrument for measuring the degree to which light is transmitted through a medium without absorption.
ΘΚΠ
the world > matter > physics > electromagnetic radiation > light > refraction > [noun] > index of refraction > measurement of indices > instrument for
spectrometer1874
reflectometer1879
transmissometer1955
1955 Sci. News Let. 24 Sept. 197/1 Other equipment the Weather Bureau plans to purchase includes:... Ceilometers and transmissometers, instruments that tell cloud ceiling height and visibility.
1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) X. 172/1 Reflectometer. This instrument, also called a transmissometer, combines integrating spheres and barrier-layer cells... The transmittance can be measured by placing a sample of the material in the opening between the two spheres.
1975 Nature 3 Apr. 414/2 A volumetric concentration [in the sea] on the order of 0·01–1%, obtained from the acoustic data, enabled us to carry out a first-cut check of acoustic and transmissometer readings.
This entry has not yet been fully updated (first published 1986; most recently modified version published online September 2018).
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