photodensitometern.
/ˌfəʊtə(ʊ)dɛnsᵻˈtɒmᵻtə/, U.S. /ˈˌfoʊdəˌdɛnsəˈtɑmədər/ Science.
An instrument for measuring the density of a photographic negative or the opacity of a fluid.
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photodensitometer1928
photodetector1947
1928 Jrnl. Optical Soc. Amer. 16 222 A self-registering photodensitometer has been described in which the direct-reading method and a thermocouple are employed.
1949 Jrnl. Appl. Physics 20 129/2 The specimen containing the diffused Na24 was placed directly on the emulsion for one-half hour... The plate was then developed and analyzed in a photo-densitometer.
1971 Nature 19 Feb. 572/1 For most plant shoots, however, the change in methylene blue concentration is far too small to be accurately measured using standard photodensitometers.
1995 Mineral. Mag. 59 35 The readings were done optically on a Jarrell-Ash photodensitometer.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1928