Optical differential tilt sensor

Details Optical differential tilt sensor Optical differential tilt sensor

1989-03-13

1991-01-01

Tarcza, Thomas H.

Optics: measuring and testing

Angle measuring or angular axial alignment

Apex of angle at observing or detecting station

356152, 356144, 356147, 356365, 350370, 2502031, C01C 100, G01J 400

Patent

active

049813544

ABSTRACT:
An electrooptical sensor system directly measures the angle between two nearly parallel collimated laser beams. After focussing with a positive lens, the beams pass through a photoelastic modulator, a quarter wave retardation plate, and two polarizers. The beams then hit a lateral cell position sensor. Electrical signals from the lateral cell are processed with special electronics to yield a voltage which is proportional to the angular difference between the two beams. The sensor measures extremely small angles and operates at a high bandwidth. Its primary application is in the control of phased array optical telescopes.

REFERENCES:
patent: 3623814 (1971-11-01), Buhrer
patent: 4624563 (1986-11-01), Johnson
patent: 4639586 (1987-01-01), Fender et al.
patent: 4667090 (1987-05-01), Carreras et al.
De Hainaut et al., "Design of a Wide Field of View Phased Array Telescope," Optical Engineering, vol. 27, No. 9, Sep. 1988, pp. 736-739.
De Hainaut et al., "System Design of a Wavefront Sensing Package for a Wide Field of View Optical Phased Array," Optical Engineering, vol. 27, No. 9, Sep. 1988, pp. 785-792.

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