Electro-optical fourier vernier device

Details Electro-optical fourier vernier device Electro-optical fourier vernier device

1974-07-22

1976-04-20

Wilbur, Maynard R.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 28, 250237G, G01C 308

Patent

active

039515486

ABSTRACT:
An electro-optical device for generating data signals representing relative displacement between an aperture pattern in a reference plane and a reflective pattern in a measurement plane comprises a reference detector for sensing reference radiation directed towards the aperture pattern and a convolution detector for sensing the reference radiation reflected by the reflective pattern. The phase of a signal generated by the convolution detector is compared to the phase of a signal generated by the reference detector for generating the data signals defining the relative displacement between the aperture pattern and the reflective pattern.

REFERENCES:
patent: 3344700 (1967-10-01), Brake
patent: 3537793 (1970-11-01), Shaffer, Jr.

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