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Ford Global Technolgoies, LLC

Mumin Song

Fang Frank Chen

James Stewart Rankin, Ii

Paul Joseph Stewart

Patrick J Harwood

Christopher Thomas Griffen

A measurement system ( ) for accurately measuring the surface geometry of a part ( ) in three dimensions includes a laser ( ) for emitting a laser beam ( ). The laser beam ( ) is transmitted to a birefringent crystal ( ) which splits the laser beam ( ) into a pair of beams ( ). The pair of beams ( ) are then subjected to a phase shift by a liquid crystal system ( ) as controlled by a computer ( ). The pair of beams ( ) are then expanded in order to form a fringe pattern ( ) on the surface of the part ( ) to be measured.

Crystal based fringe generator system

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).

Surface measurement system with a laser light generator

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Ann Arbor, MI, United States of America

Mumin Song