Interferometric tilt sensor

Details Interferometric tilt sensor Interferometric tilt sensor

1987-05-22

1988-05-24

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356363, G01B 902

Patent

active

047462175

ABSTRACT:
An apparatus and method for remotely sensing the angular displacement of a test surface 22. Two coherent collimated light beams 10,12 having different optical frequencies are directed toward optically reflective target areas 18,20. The beams are reflected and converge to form a fringe pattern in an interference zone 24. A sampling means 34 having at least one sampling aperture is positioned within the interference zone 24. The sampling aperture lies in a plane substantially perpendicular to a plane formed by the converging beams and it has a width smaller than the effective spatial period of the fringe field, .lambda..sub.es, where .lambda..sub.es =.lambda..sub.s /cos.phi., .lambda..sub.s being the spatial period of the finge field and .phi. being the angular deviation of the plane of the sampling aperture from a plane which is perpendicular to the fringe planes of the fringe field. A light detector 42 is positioned to receive the modulated optical radiation which is sampled from the interference zone. This modulated optical radiation is converted into a sample electronic signal. Any rotation of the test surface 22 about the X-axis which is normal to the converging light beams is sensed by comparing the phase of the sample electronic signal to the phase of a reference electronic signal having a frequency equal to the frequency difference between the two light beam 10,12.

REFERENCES:
patent: 3930734 (1976-01-01), Holly et al.
patent: 4188122 (1980-02-01), Massie et al.
patent: 4213704 (1980-07-01), Burns et al.
patent: 4334779 (1982-06-01), Domey et al.
patent: 4395123 (1983-07-01), Minott
patent: 4525068 (1985-06-01), Mannava et al.
patent: 4526471 (1985-07-01), Bykov et al.

Affiliated with

Also associated with

Rating

Interferometric tilt sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Interferometric tilt sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interferometric tilt sensor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1055652