Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-04-14
1988-08-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356361, G01V 904
Patent
active
047646802
ABSTRACT:
An arrangement for testing a cylindrical object, which may be constituted either by a reflective or refractive element capable of focusing collimated light into a focal line or by an elongated filament, employs cooperation of the element and of the filament, with a laser beam directed onto the element. The filament, especially an optical fiber, extends along the focal line of the element, so that a portion of the laser beam aimed at the element and focused thereby into a waist region extending along the focal line and thus onto the filament, is reflected back to the element and recollimated thereby for travel back along the path of the original laser beam, whereupon the return light beam is caused to interfere with the original laser beam and thus to provide an interferogram that can then be evaluated to obtain information about the magnitude and location of any deviations of the object being tested from its ideal shape.
REFERENCES:
patent: 3953128 (1976-04-01), Holly
patent: 4565449 (1986-01-01), Grego
patent: 4571082 (1986-02-01), Downs
patent: 4711574 (1987-12-01), Baldwin
Nelms David C.
Ruoff Jessica
Ruzek Peter R.
United Technologies Corporation
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