Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1980-10-28
1983-08-02
Corbin, John K.
Optics: measuring and testing
By particle light scattering
With photocell detection
356360, G01B 9021
Patent
active
043962890
ABSTRACT:
A holographic interferometric method for determining dimensional differences between two objects having complementary shapes. The first step of the method is to construct a hologram of one of the objects using radiant energy of predetermined temporal and spatial coherence. The hologram of the one object is then reconstructed in a well-known manner and operates to diffract radiant energy incident thereto into n-number of wavefronts where -a.ltoreq.n.ltoreq.+a and a is an integer. A reflected wavefront is then formed from the other object by directing thereat radiant energy substantially identical to that used to either construct or reconstruct the hologram. Then, the other object wavefront is directed onto the hologram to reconstruct the hologram again by transmitting therethrough the other object wavefront. The hologram operates to diffract the other object wavefront into n-number of wavefronts where -a.ltoreq.n.ltoreq.+a and a is an integer. A predetermined n.sup.th -order wavefront from the first hologram reconstruction is then combined with the corresponding (n+1).sup.th -order wavefront from the other hologram reconstruction to form an interference pattern. The interference pattern is then interpreted to determine dimensional differences between the objects. Apparatus by which the method of the invention can be conveniently practiced is also disclosed.
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Emmel et al., "A New Instrument for Routine Optical Testing of General Aspherics", Proc. SPIE, vol. 171, pp. 93-99, 1/79.
Caufield Francis J.
Corbin John K.
Koren Matthew W.
Polaroid Corporation
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