Rectification of a laser pointing device

Details Rectification of a laser pointing device Rectification of a laser pointing device

1993-10-12

1995-03-21

Evans, F. L.

Optics: measuring and testing

Angle measuring or angular axial alignment

356153, 356400, 21912178, 36416701, 36457104, G01B 1100

Patent

active

054001323

ABSTRACT:
Methods of compensating for errors in a laser pointing device, particularly for use in three-dimensional applications, by accurately controlling the angle that the laser beam makes in space.
A method for rectifying a laser pointing device that aims a laser beam by deflecting the beam through a plurality of optical deflection devices each directed by a galvanometer controlled by an input. In the method, the laser pointing device is established in an accurate angular relationship to at least four fiducial points. The angular errors internal of the laser pointing device are determined by comparing actual galvanometer inputs to nominal galvanometer inputs, assuming no error in the established angular relationship. The actual galvanometer inputs are those that aim the laser beam at the fiducial points (while recognizing the existence of the internal errors), and the nominal galvanometer inputs are those that would aim the laser beam at the fiducial points assuming no internal errors in the laser pointing device. The angular errors are stored in a form for use during scanning by the laser pointing device to compensate for the internal errors in converting nominal direction numbers computed by a control to actual galvanometer inputs.

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