Light detection with waveguide having fully and partially reflec

Details Light detection with waveguide having fully and partially reflec Light detection with waveguide having fully and partially reflec

1990-02-28

1991-09-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

25022731, H01J 4014

Patent

active

050456849

ABSTRACT:
A low-cost wide-band light detection system is disclosed using a light conducting member which is a long dielectric waveguide having a phototransistor at a far end. The waveguide or light conducting member is designed to have a specified leakage rate with one side of the guide being perfectly reflecting and the other side being only partially reflecting. The output of the phototransistor or other photodetector is dependent upon the intensity and position of the beam which strikes an incident zone of the photodetection device. The photodetection device may function as a laser power monitor, while advantageously allowing most of the laser power to be used for an experiment or other purpose. Additionally, the device may be used as a position sensitive detector (PSD). By using one of the devices as a power monitor and another of the devices as a PSD in the same experiment, one can determine the motion or displacement of an object under test independent of instability in the laser or other source of light.

REFERENCES:
patent: 3039002 (1962-06-01), Guerth
patent: 3978334 (1976-08-01), McCardell
patent: 4047816 (1977-09-01), Pell et al.
patent: 4049644 (1977-09-01), Wennerstrom
patent: 4123165 (1978-10-01), Brown et al.
patent: 4371897 (1983-02-01), Kramer
patent: 4602154 (1986-07-01), Taniguchi
patent: 4840445 (1989-06-01), Lerat
IBM Technical Disclosure Bulletin, vol. 13, No. 3, Aug. 1970.

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