Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1978-10-02
1980-08-26
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01B 902, G01B 900
Patent
active
042192765
ABSTRACT:
A detection system for a ring laser gyro includes an array of photo-diodes mounted in the path of the laser beams, preferably on one of the laser mirrors. The outputs of the photo-diodes are selectively fed to first and second differential amplifiers to provide first and second outputs in quadrature relationship which represent the fringe or beat signal patterns generated between the clockwise and counter-clockwise rotating laser beams. An intensity signal for use in tuning and adjusting the laser for maximum output is generated from the very same diodes utilized for generating the quadrature related fringe signals. This end result is achieved by placing the terminals of the diodes not connected to the differential amplifier in parallel with each other and placing an amplifier in the current feed path for these elements, thereby providing a signal to the amplifier representing the sum of the photo-diode currents. This provides as the output of the last mentioned amplifier a relatively high level intensity signal having minimum fluctuations in amplitude.
REFERENCES:
patent: 4152072 (1979-05-01), Hutchings
Hamann H. Fredrick
McGraw Vincent P.
Pitts Rolf M.
Rockwell International Corporation
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