Optical power meter with automatic switching of photodetectors h

Details Optical power meter with automatic switching of photodetectors h Optical power meter with automatic switching of photodetectors h

1986-09-30

1988-06-07

Westin, Edward P.

Optics: measuring and testing

Photometers

Photoelectric

356224, 356 731, 250214R, G01J 142, H01J 4014

Patent

active

047492759

ABSTRACT:
An optical power meter system comprises a chopper with a semicircular total reflection mirror along an incident light path, two photo-detectors of different characteristics of wavelength sensitivity, and a comparator for comparing the levels of the photo-detection signals derived from the two photo-detectors and for outputting the optical detection signal of a higher level. The photo-detectors are positioned in a first path of the light passing through the chopper and a second path of the light reflected by the chopper, respectively. The comparator may be replaced by an adder for adding the photo-detection signals derived from the two photo-detectors.

REFERENCES:
patent: 3562795 (1971-02-01), Frenk
patent: 3664752 (1972-05-01), Hermieu
patent: 4260255 (1981-04-01), Wachs et al.
patent: 4467203 (1984-08-01), Rappaport

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