Holographic optical apparatus and method for producing the same

Details Holographic optical apparatus and method for producing the same Holographic optical apparatus and method for producing the same

G - Physics

01

B

88/0.13

G01B 9/021 (2006.01) G01B 9/02 (2006.01)

Patent

CA 1109707

Abstract of the Disclosure Optical measuring and testing apparatus incorporating a holographically recorded, single-frequency phase grating. When this phase grating is illuminated by a quasi-monochromatic spatially coherent light source, it acts as a basic common path interferometer and constitutes a highly efficient source for a high contrast, stable, interference fringe pattern. In one embodiment, elements are repositioned to move the light source with respect to the grating thereby to alter the number of fringes in a given area. In another embodiment the grating moves in a plane that is orthogonal to an axis from the light source. This motion causes the fringe pattern to move past detecting means thereby to sense motion of the grating. In a third embodiment, a phase grating operates as a Fourier filter in a coherent optical processor which generates equal height contour lines from the information contained in two vertical stereo photographs.

318536

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