Phase-stepping fiber-optic projected fringe system for surface t

Details Phase-stepping fiber-optic projected fringe system for surface t Phase-stepping fiber-optic projected fringe system for surface t

1991-05-13

1992-09-08

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356360, 356376, 382 26, 364575, G01B 1102

Patent

active

051462931

ABSTRACT:
A projected fringe interferometer for measuring the topography of an object periodically steps the phase angle between a pair of light beams emanating from a common source. The steps are .pi./2 radians (90.degree.) apart and at each step a video image of the fringes is recorded and stored. Photodetectors measure either the phase angle .theta. of the beams or 2.theta. either of which is used to control one of the light beams so the 90.degree. .theta. is accurately maintained. A camera, a computer, a phase controller and a phase modulator established closed-loop control of .theta.. Measuring the phase map of a flat surface establishes a calibration reference.

REFERENCES:
patent: 3520607 (1970-07-01), Zoot
patent: 4639139 (1987-01-01), Wyant et al.
patent: 4677302 (1987-06-01), Chiu et al.
patent: 4695163 (1987-09-01), Schachar
patent: 4732483 (1988-03-01), Biegen
patent: 5042949 (1991-08-01), Greenberg et al.
W. T. Welford, "Some Applications of Projected Fringes", Optica Aeta, vol. 16, pp. 371-379 (1969).

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