US 7,321,421 B2 | ||
Apparatus and methods for scanning conoscopic holography measurements | ||
Stephen J. Bennison, Bellevue, Wash. (US) | ||
Assigned to The Boeing Company, Chicago, Ill. (US) | ||
Filed on Jul. 30, 2004, as Appl. No. 10/903,332. | ||
Prior Publication US 2006/0023223 A1, Feb. 02, 2006 | ||
Int. Cl. G01N 21/00 (2006.01) |
U.S. Cl. 356—237.1 [356/237.6; 356/445; 356/614] | 33 Claims |
1. A system for performing a measurement of a physical characteristic of a workpiece, comprising:
a conoscopic holography sensor configured to emit a laser beam;
a beam directing assembly configured to adjustably direct the laser beam toward the workpiece, and to adjustably direct a
reflected light from the workpiece into the conoscopic holography sensor, wherein the conoscopic holography sensor includes
a crystal configured to transmit the reflected light to form a fringe pattern at least partially indicative of the physical
characteristic, wherein the beam directing assembly includes:
a first mirror operatively coupled to a first galvanometer and being controllably adjustable to direct the laser beam alone
a first axis; and
a second mirror operatively coupled to a second galvanometer and being controllably adjustable to direct the laser beam along
a second axis; and
a control assembly operatively coupled to the conoscopic holography sensor and to the beam directing assembly, the control
assembly being configured to send a first control signal to the conoscopic holography sensor to initiate the emission of the
laser beam, and a second control signal to the beam directing assembly to controllably adjust a direction of the laser beam.
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