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Black bodies in the extreme infra-red

Cartwright, C. Hawley (1930) Black bodies in the extreme infra-red. Physical Review, 35 (4). pp. 415-420. ISSN 0031-899X. http://resolver.caltech.edu/CaltechAUTHORS:CARpr30

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Abstract

Absorbing power of various materials of wave-lengths greater than 50μ—For blackening a receiver of a thermocouple for radiation for obtaining pure rotation band spectra, it is desirable to use a material that is an efficient absorber of the extreme infra-red but a poor absorber of radiation of shorter wave-lengths. The absorbing power of 25 materials were tested for radiation of wave-lengths near 4μ and greater than 50μ. Of all the materials tested, white lead, litharge, red phosphorus, powdered glass, copper sulphide, and celestite were found the best for covering a receiver to absorb the extreme infa-red radiation. The 25 materials were tested by painting them on a receiver of a thermocouple which was exposed to extreme infra-red radiation. The same receiver and thermocouple were used throughout the experiment. A D'Arsonval type galvanometer was improved by using a quartz suspension and replacing each conducting lead with silver leaf or gold plated silver ribbon 1μ thick wound in a spiral.


Item Type:Article
Additional Information:©1930 The American Physical Society. Received 30 December 1929.
Record Number:CaltechAUTHORS:CARpr30
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:CARpr30
Alternative URL:http://dx.doi.org/10.1103/PhysRev.35.415
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2569
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Apr 2006
Last Modified:26 Dec 2012 08:49

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