Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1990-02-01
1991-10-22
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
372 31, 372 94, G01C 1966
Patent
active
050590286
ABSTRACT:
A closed path (14) around which two beams of laser radiation may pass in opposite directions is formed in a block (10) of material and is defined by at least three mirrors (11, 12 13). One of these mirrors (11) is partially transmissive of laser radiation in each beam and has detector means (17, 18) associated with it to derive electrical signals dependent upon the rotational forces acting on the gyroscope about an axis 19. A second mirror (12) is totally reflecting and is associated with a transducer (20) which continuously moves the mirror. Second detector means (21) is responsive to laser radiation in the two beams to derive alternating-current signals to control the transducer (20). Control means (22) respond to the direct-current component of the output of the second detector means (21) to maintain the intensity of the laser beams at a constant value.
REFERENCES:
patent: 4284964 (1981-08-01), Maier, Jr.
patent: 4514087 (1985-04-01), Vescial
patent: 4890923 (1990-01-01), Buschelberger
GEC Ferranti Defence Systems Limited
McGraw Vincent P.
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