Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-01-10
1976-01-20
Stolwein, Walter
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250216, 250237R, 356 74, H01J 3912
Patent
active
039341534
ABSTRACT:
A Bragg cell spectrum analyzer in which the output of the Bragg cell is detected by a unique electro-optic system which allows the selection of any desired dynamic power detection range. As is known in the art, the output of a Bragg cell consists of a radiation spot or spots along a line in which the position of each spot along the line is related to the frequency of a component of the input signal to the Bragg cell, and the intensity of radiation of each spot is proportional to the strength of the component causing that spot. In the disclosed embodiment the output of the Bragg cell is directed upon a cylindrical lens system which expands each spot into a line of radiation. This results in a two dimensional pattern of lines with the position of each line being the same as the position of the radiation spot causing the line, and the intensity of radiation in each line being proportional to the intensity of radiation in the spot causing that line. The two dimensional pattern of radiation, consisting of spaced lines of radiation, is directed through a stepped density filter onto a two dimensional photodiode array. The photodiode array is utilized to detect the position of each line, which indicates the frequency of the input component causing that line, and is utilized to detect the number of photodiodes reaching saturation along the line, which indicates the strength of the component.
REFERENCES:
patent: 2807799 (1957-09-01), Rosenthal
patent: 3193687 (1965-07-01), Hatcher
patent: 3612691 (1971-10-01), Schwartz
patent: 3700910 (1972-10-01), Smith
patent: 3702735 (1972-11-01), Potter, Jr.
patent: 3829218 (1974-08-01), Alyanak
Lindley John P.
Rieden James
Blair Homer O.
Glanzman Gerald H.
Itek Corporation
Nathans Robert L.
Stolwein Walter
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