Optical attenuator providing controlled attenuation

Details Optical attenuator providing controlled attenuation Optical attenuator providing controlled attenuation

1980-11-18

1983-03-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250205, 350384, G01V 120

Patent

active

043784909

ABSTRACT:
The real attenuation produced by the optical attenuator is determined by means of photodetectors which carry out continuous measurement of the intensity of an auxiliary beam before and after it passes through the attenuator element. Signals which are emitted by the photodetectors and are proportional to the intensity received are transmitted to an electronic processing system which computes and displays the attenuation in decibels.

REFERENCES:
patent: 3962576 (1976-06-01), Kuhl et al.
patent: 4071751 (1978-01-01), Waksburg
patent: 4306142 (1981-12-01), Watanabe et al.

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