Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1992-07-15
1994-03-01
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 28, 368120, G01C 308, G01P 336
Patent
active
052912620
ABSTRACT:
A laser survey instrument is described which includes a laser rangefinder which determines the time-of-flight of an infrared laser pulse to a target, a magnetic compass module which produces an electronically readable compass signal, a vertical angle sensor module which produces an electronically readable inclination signal, and a microprocessor-based microcontroller. The device is small enough to be easily hand-held, and includes a trigger and a sighting scope for a user to visually select a target and to trigger operation of the device upon the selected target. The sighting scope preferably has means for measuring the apparent width of the target. The laser rangefinder includes self-calibrating interpolation circuitry, a digital logic-operated gate for reflected laser pulses in which both the "opening" and the "closing" of the gate can be selectably set by the microcontroller, and dual collimation of the outgoing laser pulse such that a minor portion of the outgoing laser pulse is sent to means for producing a timing reference signal. The instrument is capable of performing numerous kinds of surveying operations.
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