Method of and apparatus for measuring small gaps

Details Method of and apparatus for measuring small gaps Method of and apparatus for measuring small gaps

1990-08-21

1993-04-27

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356378, 356384, G01B 1100, G01B 1122, G01B 1102

Patent

active

052067033

ABSTRACT:
A technique for measuring a small gap, in particular the clearance gap between the lobes of the rotors of a screw compressor. Light is directed through the gap, and the amount of paraxial light passing through the gap is measured, with the gap width being related to the measured amount of light. The light is directed at the pitch line helix angle into the rotor clearance gap, and the paraxial light is measured by means of an area scan camera.

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patent: 3102960 (1963-09-01), Sick
patent: 3746455 (1973-07-01), Flamholz
patent: 3809907 (1974-05-01), Schuller et al.
patent: 4399861 (1983-08-01), Carlson
patent: 4659937 (1987-04-01), Cielo et al.
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patent: 4695233 (1987-09-01), Miyoshi et al.
patent: 5008556 (1991-04-01), Mersch
"Pin Gauges" German Metrology Equipment Manufacturer, Mahr, pp. 185-186.
Optical Technology--"Double Perflectomefer" for Measuring Small Holes Diameters, vol. 38, No. 1 pp. 28-321; Jan. 1974; Vesnina et al.

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