Accurate correlator of rotational and translational motions and

Details Accurate correlator of rotational and translational motions and Accurate correlator of rotational and translational motions and

1991-05-10

1992-10-13

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356351, 356358, 356346, 250225, G01B 902

Patent

active

051555506

ABSTRACT:
A beam retarder positioned in the path of a superimposed linearly polarized working beam and an orthogonal linearly polarized reference beam, where the working beam and the reference beam have travelled over different optical paths, converts the linearly polarized superimposed working beam and reference beam components into circularly polarized beam components having opposite hands. A rotatable analyzer projects an analyzed beam having phase characteristics determined by the rotational orientation of the analyzer and by the optical path difference between the reference beam and the working beam. A radiation sensitive detector detects changes in intensity of the analyzed beam that are related to the beat frequency and phase of the analyzed beam. Signal processor apparatus relate the phase of the beat frequency to the rotation of the analyzer to adjust the variable path length traveled by the working beam.

REFERENCES:
patent: 3635552 (1972-01-01), De Lang
patent: 4688934 (1987-08-01), Clark
A. M. Title et al., "Improvements in Birefringent Filters. 6: Analog Birefringement Elements", Applied Optics, vol. 19, No. 12, Jun. 1980, pp. 2046-2071.
G. C. Bjorklund, "Frequency-modulation Spectroscopy: A New Method for Measuring Weak Absorptions and Dispersions", Optics Letters, vol. 5, No. 1, Jan. 1980, pp. 15-17.
C. B. Carlisle, et al., "Quantum Noise-Limited FM Spectroscopy with a Lead-salt Diode Laser", Applied Optics, vol. 28, No. 13, Jul. 1989, pp. 2567-2576.
J. L. Hall et al., "Optical Heterodyne Saturation Spectroscopy", Applied Physics Letters, vol. 39, No. 9, Nov. 1980, pp. 680-682.

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