Photodetector system for determination of the wavelength of inci

Details Photodetector system for determination of the wavelength of inci Photodetector system for determination of the wavelength of inci

1975-07-09

1976-10-19

Lieberman, Eli

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

H01J 3912

Patent

active

039872980

ABSTRACT:
A photodetector system is used to resolve the wavelength of an unknown line source in a broad spectral range or to determine the temperature of blackbody or other broad band sources. The photodetector system includes two photodetectors having the same band gap but different thicknesses. The thicker of the two photodetectors receives radiation transmitted by the thinner photodetector. Because responsivity and quantum efficiency are influenced by detector thickness, a signal indicative of the wavelength or temperature is produced by taking the ratio of the signals from the two photodetectors.

REFERENCES:
patent: 3454769 (1969-07-01), Dynes
patent: 3508126 (1970-04-01), Newman et al.
patent: 3845494 (1974-10-01), Ameurlaine et al.

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