Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1975-01-10
1976-06-08
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250216, 250226, 250578, 356 74, 356 93, G01J 302, G01J 342, G01J 334
Patent
active
039625770
ABSTRACT:
An electro-optic system having an extended dynamic power range. The dynamic power range of a Bragg cell spectrum analyzer is expanded by unevenly splitting the radiation output of the Bragg cell with a beam splitter and directing a major portion of the radiation output to a first photodiode array and a minor portion of the radiation output to a second photodiode array. The first photodiode array is utilized to detect the output of the Bragg cell until it becomes sufficiently intense to saturate it. When the first photodiode array becomes saturated, the second photodiode array, which receives a minor amount of radiation from the Bragg cell, is utilized to detect the output of the Bragg cell. Detection with the first and second photodiode arrays allows the dynamic power detection range of the system to be expanded to include the combined detection ranges of the first and second photodiode arrays.
REFERENCES:
patent: 2744439 (1956-05-01), Hill
patent: 3011386 (1961-12-01), Rosenthal
patent: 3653765 (1972-04-01), Hearn
patent: 3861801 (1975-01-01), Peters et al.
Lindley John P.
Rieden James
Blair Homer O.
Glanzman Gerald H.
Itek Corporation
La Roche E. R.
Nathans Robert L.
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