Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1988-01-19
1989-10-31
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1964
Patent
active
048773115
ABSTRACT:
Instead of using two power monitoring photodiodes and associated summing circuitries for adding the power of the laser beams circulating in the cavity of a ring laser gyro, the present invention eliminates one of the photodiodes and uses, in its stead, reflective means for directing both of the laser beams onto the remaining power monitoring photodiode, which automatically measures and sums the light intensities or power from the laser beams and provides as an output the thus added power directly to the necessary electronic circuitry to maintain constant the pathlength of the cavity.
REFERENCES:
patent: 4152072 (1979-05-01), Hutchings
patent: 4514087 (1985-04-01), Vescial
patent: 4514832 (1985-04-01), Vescial
patent: 4677641 (1987-06-01), Podgorski
Kearfott Guidance & Navigation Corporation
McGraw Vincent P.
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