Methods for wavelength discrimination of monochromatic light bea

Details Methods for wavelength discrimination of monochromatic light bea Methods for wavelength discrimination of monochromatic light bea

1994-09-22

1997-12-30

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214PR, 356419, G01J 350, H01J 516, H01J 4014

Patent

active

057033579

ABSTRACT:
Methods for wavelength determination of a monochromatic beam are described. The methods involve a detector unit containing at least one variable filter and at least one pair of photo detectors. The detectors have photo sensitive regions with their areas varying with the position in one direction. The wavelength for maximum transmission of the variable filter varies in the same direction. By comparing the photo current values from the two detectors, wavelength of the incident beam is determined. Methods to construct wavelength discrimination junction photo detector pair and double barrier photo detector pair are also given.

REFERENCES:
patent: 2896086 (1959-07-01), Wunderman
patent: 4054389 (1977-10-01), Owen
patent: 4308456 (1981-12-01), Van Der Gaag et al.
patent: 4520381 (1985-05-01), Moriguchi et al.
patent: 5166755 (1992-11-01), Gat
patent: 5225894 (1993-07-01), Nicholson et al.
patent: 5266792 (1993-11-01), Crowne et al.

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