Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-02-26
1992-02-11
Fields, Carolyn E.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214A, 356218, 356226, 356227, G01J 144
Patent
active
050878085
ABSTRACT:
A combined optical power and noise meter for measuring both optical power and optical noise includes a detector housing and a photodiode which is disposed in the detector housing. The resistence of the photodiode changes continually in response to the application of optical power thereon. A current to voltage converter applies a bias voltage to the photodiode and transforms an output current therefrom in order to obtain a power voltage which is proportional to the optical power. A first voltage meter is electrically coupled to the current to voltage converter in order to display the power voltage. A noise measuring circuit measures noise in the output voltage of the current to voltage converter and processes the output voltage in order to obtain a noise voltage which is proportional to the optical noise. A divider divides the noise voltage by the power voltage in order to obtain an optical noise to optical power voltage which is proportional to the ratio of optical noise to optical power. A second voltage meter is electrically coupled to the divider in order to display the optical noise to optical power voltage.
REFERENCES:
patent: 3687558 (1972-08-01), Rex
patent: 3966325 (1976-06-01), Mohler
patent: 4366378 (1982-12-01), Simons
patent: 4749275 (1988-06-01), Shimomura et al.
patent: 4864218 (1989-09-01), Leake et al.
patent: 4889985 (1989-12-01), Allsop et al.
Fields Carolyn E.
Johansen W. Edward
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