Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1974-09-03
1976-09-28
Corbin, John K.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
356109, 356113, 350 35, G01B 902
Patent
active
039828352
ABSTRACT:
To facilitate visual and/or electronic determination of the shape of a light-reflecting test object, a source of coherent light such as a laser produces an illuminating beam and a reference beam, the latter beam being combined in an optical system with reflections of the illuminating beam from the test object to form a holographic pattern on a receiving surface. The optical system includes a main objectives and two ancillary objectives, these ancillary objectives focusing the reflected rays of the illuminating beam and the rays of the reference beam upon two substantially coincident points so located on or near the axis of the main objective, in non-conjugate relationship with the receiving surface, as to train upon that surface a defocused composite beam producing a holographic pattern of contour lines. The substantially coincident points also lie in or near the plane of a real or virtual aperture stop, such as a pinhole diaphragm or its image. Lens groups of different focal length, or a varifocal assembly, may be used as the main objective to enable full illumination of the receiving surface in different object positions; if necessary, especially with polychromatic radiation, adjustable delay means make its effective path length equal to that of the reflected illuminating beam in different object positions.
REFERENCES:
patent: 2151631 (1939-03-01), Williams
patent: 3494698 (1970-02-01), Neumann
patent: 3596104 (1971-07-01), Macomber
patent: 3813139 (1974-05-01), Carlsen
Clark Conrad
Corbin John K.
Dubno Herbert
Hauser Raimund
Montague Ernest G.
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