Optics: measuring and testing – Angle measuring or angular axial alignment
Patent
1974-08-08
1976-01-13
McGraw, Vincent P.
Optics: measuring and testing
Angle measuring or angular axial alignment
356152, 356114, 350159, 250225, G01C 100, G01J 400
Patent
active
039320391
ABSTRACT:
An electro-optical system is disclosed for measuring rotational angle. The system includes a radiation source and reference linear polarizer in combination with a plurality of linear target polarizers. Photosensors are arranged to receive modulated light separately from an adjacent pair of target polarizers. Pulsed electrical output signals representative of the modulated light received by the photosensors are generated. Means are provided for comparing output signals from the sensors and generating a signal representative of rotational angle between the reference and target. The angle of rotation between the reference linear polarizer and the target linear polarizers is thereby converted to a representative signal which may be used to drive a servo motor or other device operatively connected to a rotatable element directly or indirectly. The reference polarizer may be held in a fixed position or it may be mounted on an independently rotatable element.
Angle measurement systems herein disclosed may be used in servo loops, as follow-up control devices or angle measurement pick-off applications. Devices controlled by an operator head motion can be used for hand-free control of machines, tools, weapon systems, or radar antenna positioning systems. Because mechanical linkages are not required between most elements of the system, systems according to the present invention are especially useful for remote optically-coupled sensing and control systems.
REFERENCES:
patent: 3316799 (1967-05-01), Daley et al.
patent: 3474255 (1969-10-01), White
patent: 3604811 (1971-09-01), McMenmin
Henry Jon W.
McGraw Vincent P.
Schron D.
Westinghouse Electric Corporation
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