Surface measurement system with a laser light generator

Details Surface measurement system with a laser light generator Surface measurement system with a laser light generator

1999-06-11

2000-08-08

Pham, Hoa Q.

Optics: measuring and testing

By polarized light examination

With light attenuation

25055922, G01B 1124

Patent

active

061009849

ABSTRACT:
A measurement system (10) for accurately measuring the surface geometry of a part in three dimensions includes a laser (22) for emitting a laser beam (20). An objective lens (18) receives the laser beam (20) and expands the received laser beam (20) into a diverged beam. A liquid crystal system (16) is disposed in front of the objective lens (18) with respect to the laser (22) for receiving the diverged beam. The liquid crystal system (16) receives the diverged beam and generates at least one fringe pattern (24) on a surface of a three dimensional part which is to be measured. A computer (12) is in communication with the liquid crystal system (16) to control the pitch and phase of the fringe pattern (24).

REFERENCES:
patent: 4906099 (1990-03-01), Casasent
patent: 5175601 (1992-12-01), Fitts
patent: 5319445 (1994-06-01), Fitts
patent: 5450204 (1995-09-01), Shigeyama et al.
patent: 5471308 (1995-11-01), Zeien
patent: 5581352 (1996-12-01), Zeien
patent: 5589942 (1996-12-01), Gordon
patent: 5691784 (1997-11-01), Hausler et al.
patent: 5825482 (1998-10-01), Nikoonahad

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