Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1984-07-16
1987-08-11
Buczinski, Stephen C.
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
340982, 342398, G01B 1126
Patent
active
046858008
ABSTRACT:
Disclosed is a system for aligning elements in azimuth, in particular guns of artillery batteries. A prior system of this type uses an omnidirectional xenon beacon which produces pulses to indicate rotation of a reference unit, a double pulse indicating a reference director. A receiver counts pulses until it detects a directional laser beam from the reference unit, the number of pulses given a reading of what is known as a reciprocal bearing. The xenon and laser pulses are optically separated in the receiver. The prior system is not as reliable as desired, mainly because of scintillation effects. The present invention overcomes this problem by identifying different pulses by the pattern of their arrival times. A detector unit generates and stores numbers each having a magnitude proportional to their time of arrival. The numbers are processed by a microprocessor to determine the angle through which the laser beam travels between a reference direction and the direction of the detector unit. The system can compensate for slow changes in speed of rotation of the beacon and overcomes the effects of scintillation of signals over heated terrain. The receiver is lighter than one using optical pulse separation.
REFERENCES:
patent: 3400398 (1968-09-01), Lapeyre et al.
patent: 3714657 (1973-01-01), Lapeyre
patent: 3881824 (1975-05-01), Higgins
Buczinski Stephen C.
Her Majesty the Queen in right of Canada
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