Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1987-11-02
1989-12-26
Tarcza, Thomas H.
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
33263, 33266, 33279, 33286, 33288, 250578, 356149, 356153, 356250, 356400, G01B 1126, G01C 110, G01C 300
Patent
active
048894257
ABSTRACT:
A system for monitoring changes in shape of a structure employs a laser source attached to the structure and a set of beam splitters mounted at various locations on the structure and arranged to route portions of a laser beam produced by the laser source into various video cameras also mounted on the structure. Each video camera includes a photodetector array and produces an output signal indicating the intensity of light detected by each photodetector of the array, thereby indicating the beam intensity distribution in a corresponding plane of interest. The video output signal of each camera is digitized and stored as an intensity data array in the memory of a digital computer. The computer calculates from the intensity data array the position of the centroid of the beam with respect to a reference point on the plane of interest using a least squares fit of the intensity data to a two-dimensional Gaussian intensity distribution. Any deviation of the calculated beam centroid position from the reference point indicates a change in jig shape in the plane of interest. The reference point in each plane of interest is determined by a least squares fit of the computed beam centroids in several planes to a line.
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Edwards Frank E.
Wilcken Stephen W.
Tarcza Thomas H.
The Boeing Company
Wallace Linda J.
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