G - Physics – 01 – B
Patent
G - Physics
01
B
G01B 11/26 (2006.01) G01B 9/02 (2006.01) G01H 9/00 (2006.01) G01S 3/784 (2006.01) G01S 17/46 (2006.01)
Patent
CA 2181306
The method for the differential measurement of an angle of incidence of a luminous beam makes use of a polarized light beam which is passed twice through a birefringent plate followed by a polarizing analyzer in order to obtain a succession of interference fringes, and the orientation or the mutual spacing between the crests of said fringes, which are a direct function of the measured angle (.gamma.), are analyzed by means of a suitable detector and of an electronic analyzing circuit. The measuring device comprises a single polarizing analyzer, a birefringent plate which is followed by a mirror in order to reflect the light beam through said birefringent plate a second time, and means for detecting the variations of the luminous intensity including an electronic analyzing circuit. The use of a double passage through a birefringent plate allows to adjust the optical elements in one plane (V) in order to optimize the efficiency and the sensitivity while measuring in the other plane (H), thus obtaining a device which is simple and at the same time very sensitive to angular displacements, for example for the measurement of vibrations.
Fetherstonhaugh & Co.
Optosys Sa
Rheme Charles
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