Light wavelength selection device and method using diffraction g

Details Light wavelength selection device and method using diffraction g Light wavelength selection device and method using diffraction g

1993-12-02

1995-05-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

25022723, G01J 120

Patent

active

054204160

ABSTRACT:
An input light beam is applied to a diffraction element. The diffraction element is moved relative to a path of the input light beam while the input light beam is diffracted by the diffraction element and is thereby made into a diffracted light beam traveling from the diffraction element. A portion of the diffracted light beam is detected, and an intensity of the received diffracted light beam is also detected. In addition, a peak of the detected intensity of the received diffracted light beam is detected while the diffraction element is moved relative to the path of the input light beam. A position of the diffraction element is detected at which the detected peak of the detected intensity occurs. The position of the diffraction element is controlled on the basis of the detected position at which the detected peak of the detected intensity occurs.

REFERENCES:
patent: 4815820 (1989-03-01), McNeil et al.
patent: 5173794 (1992-12-01), Cheung et al.
patent: 5233405 (1993-08-01), Wildnauer et al.
patent: 5268737 (1993-12-01), Fukuma et al.

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