Optics: measuring and testing – Angle measuring or angular axial alignment – Relative attitude indication along 3 axes with photodetection
Patent
1998-04-10
2000-03-28
Font, Frank G.
Optics: measuring and testing
Angle measuring or angular axial alignment
Relative attitude indication along 3 axes with photodetection
3561411, 3561391, G01B 1126
Patent
active
060438746
ABSTRACT:
A system and method for checking and calibrating, if necessary, the orientation of a rotating laser beam as projected by a laser transmitter is provided. The laser transmitter is initially adjusted so that the rotating laser beam defines a plane which will be substantially horizontal if the transmitter is properly calibrated. A retroreflective target is positioned a predetermined distance from the transmitter. A known point on the transmitter is aligned in the direction of the retroreflective target. The laser beam is reflected from the retroreflective target back to the laser transmitter. A photodetecting system within the laser transmitter generates a signal representative of the position of the laser beam on the target. The laser transmitter is then rotated about a reference axis until the position of the laser beam on the target is determined with respect to each of the remaining coordinate axes. A processor is programmed to generate a calibration signal in response to the signals from the photodetecting system. The calibration signal may be used to indicate that the laser transmitter needs to be calibrated, or to provide an indication of how to calibrate the laser transmitter. Alternatively, the calibration signal may be used to calibrate the laser transmitter automatically.
REFERENCES:
patent: 4035084 (1977-07-01), Ramsay
patent: 5137354 (1992-08-01), De Vos et al.
patent: 5589939 (1996-12-01), Kitajima
patent: 5852493 (1998-12-01), Monnin
Font Frank G.
Smith Zandra
Spectra Precision, Inc.
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