Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1975-11-03
1977-08-09
Evans, F. L.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
356 51, 356201, G01N 2122
Patent
active
040413136
ABSTRACT:
A precise measurement of the absorption of weakly absorbing optical mater is measured by measuring the temperature rise of the sample when light of the wavelength of interest passes through it. The temperature rise is determined by measuring the emission from the sample due to phonon absorption processes. This emission is of a much longer wavelength than the wavelength of interest. The temperature rise is measured by measuring the rate of increase of the emitted radiation power from the sample at the longer wavelength.
REFERENCES:
patent: 3723007 (1973-03-01), Leonard
patent: 3811782 (1974-05-01), Kerr
patent: 3887471 (1975-06-01), Stotlar
Weil, Journal of Applied Physics, vol. 41, No. 7, June 1970, pp. 3012-3014.
Potter Roy F.
Stierwalt Donald L.
Evans F. L.
Phillips T. M.
Rubens G. J.
Sciascia R. S.
The United States of America as represented by the Secretary of
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