Shearing phase difference sensor

Details Shearing phase difference sensor Shearing phase difference sensor

1985-12-09

1987-11-10

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356354, G01B 902

Patent

active

047054000

ABSTRACT:
A shearing phase difference sensor including a high energy laser source for generating adjacent coherent light beam. Samples of the beams are extracted by an extracter and directed to an optical modifier. The optical modifier, positioned for intercepting the sample beams from the extracter, diffracts the beams and produces output beams which, in turn, are directed through a lens to a detector. The detector, positioned to intercept the output beams, produces electrical signals indicative of the output beams. The electrical signals are processed by a processor which calculates the phase difference between adjacent coherent light beams. Also, disclosed is a method for measuring the phase difference between adjacent coherent light beams.

REFERENCES:
Heushaw et al., "Multiple-Order Radial-Grating Shearing Interferometer", Applied Optics, vol. 21, No. 10, pp. 1772-1777, 5/82.

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