Interferometric ball bearing test station

Details Interferometric ball bearing test station Interferometric ball bearing test station

1991-08-02

1993-05-11

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356359, G01B 902

Patent

active

052105911

ABSTRACT:
Method and apparatus for determining if a surface of an object, such as a ball bearing (12), has a radius of curvature within a predetermined tolerance. A test system (10) includes an interferometer having a reference beam (20a) and a measurement beam (20b). The measurement beam is disposed for illuminating a surface of the object while the object is in motion. A cylindrical lens (24) is provided for forming the measurement beam into a linear, stripe-like pattern that illuminates the surface. The measurement beam reflects from the surface of the object to a beamsplitter (20) that combines the reflected measurement beam with a reflected reference beam. The test system further includes an imager (30), optically coupled to an output of the interferometer, for recording a two dimensional interferogram that results from a change in an optical path length of the measurement beam relative to an optical path length of the reference beam. The test system further includes a processor (32), coupled to an output of the imager, for comparing the interferogram recorded by the imager to a reference interferogram previously recorded from a surface of an object known to have a radius of curvature within the predetermined tolerance.

REFERENCES:
patent: 3749500 (1973-07-01), Carlson et al.
patent: 3812376 (1974-05-01), Takeyama et al.
patent: 3825349 (1974-07-01), Nomarski
patent: 4131365 (1978-12-01), Pryor
patent: 4917498 (1990-04-01), Geary

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