Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1988-08-22
1990-01-23
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
172 45, 356 4, 356152, G01C 308, G01B 1126
Patent
active
048954403
ABSTRACT:
A laser beam three dimensional position measurement system includes a laser transmitter mounted at a stationary reference position at a work site and a receiver mounted on a mobile machine at the site. The transmitter produces a laser reference plane by sweeping a laser beam about the transmitter. The receiver includes a retroreflector which intercepts and reflects laser energy back to the transmitter when the laser beam sweeps past the retroreflector. The system also includes at the transmitter a circuit composed of a photodetector, timer, clock and counter. The photodetector senses laser energy reflected back to the transmitter from the retroreflector. The timer modulates the laser beam produced by the transmitter in response to detection of the beam. The counter is connected to the clock and timer, and is enabled by the timer to start counting electrical pulses received from the clock when the beam is modulated. The counter is disabled to stop counting electrical pulses when the modulation is detected. The number of pulses counted by the counter is indicative of the range of the receiver from the transmitter. The orientation of the beam relative to a fixed reference axis at the time reflected laser energy is detected defines the direction of the receiver relative to the transmitter.
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Cain Gary L.
Rando Joseph F.
Sobottke Mark D.
Buczinski Stephen C.
Spectra-Physics Inc.
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