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Proceedings Paper

Radiometric And Photometric Concepts Based On Measurement Techniques
Author(s): C. Richard Duda
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Paper Abstract

The value of the fundamental quantity in radiometry, the watt, is presently realized by electrical substitution in which the temperature produced in a blackened material due to absorption of radiant energy is balanced against that produced by electrical energy whose current and voltage can be accurately measured. A new method to measure optical radiation is being explored by the National Bureau of Standards in which photons are absorbed in a semiconductor and converted with an efficiency closely approaching the theorectical maximum - 100 percent. Other radiometric concepts, such as radiance, irradiance, and radiant intensity can easily be defined through simple geometric relationships. Photometry on the other hand, while sharing these identical relationships also introduces detector response modeled after human visual traits, new measurement unit names, and a reliance on source intensity as its practical fundamental quantity. The validity of assumptions often unconsciously made in measurement techniques will be examined from the view point of detector-based radiometry and photometry.

Paper Details

Date Published: 22 September 1983
PDF: 9 pages
Proc. SPIE 0416, Applications of Optical Metrology: Techniques and Measurements II, (22 September 1983); doi: 10.1117/12.935925
Show Author Affiliations
C. Richard Duda, United Detector Technology (United States)

Published in SPIE Proceedings Vol. 0416:
Applications of Optical Metrology: Techniques and Measurements II
Jar Jueh Lee, Editor(s)

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