Abstract
A survey is given of the standards used in photometry and spectroradiometry.
After an introduction in Sec. I, the candela and lumen standards are discussed
in Sec. II. Some problems related to heterochromatic photometry and the changes
in the IPTS are mentioned in Secs. II.B and II.C, respectively. Section III
deals with standards for spectroradiometry—the tungsten strip lamp, the
anode of the carbon arc, and the high pressure xenon arc—and also with
some irradiance standards. A comparison of photometric and radiometric standards
is given in Sec. IV. It is concluded that with the present standards an accuracy
of 1% is hardly obtainable.
© 1971 Optical Society of America
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