Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1975-02-10
1977-06-21
Wilbur, Maynard R.
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
33293, 33294, 356 4, 356172, G01B 1126, G01C 308, G01C 1506
Patent
active
040308324
ABSTRACT:
A grade rod and method of operation for use in a surveying system employing a laser beam which is rotated in a plane. A flexible tape formed with a graduated scale is mounted for movement in a loop within the housing. A slider on the tape carries a pair of closely spaced-apart light detectors as well as electronic circuitry which discriminates between laser beam pulses and sunlight. Output signals from the circuitry on the slider are fed into a control circuit in the housing through a flexible cable which is carried in a traveling loop. Scale indicators are mounted for movement with the slider along a fixed scale which is provided on the housing, and a manually operated cursor is mounted for movement along the housing. The control circuit includes means for driving the tape and slider in a search mode until a light pulse from the laser hits a detector, and then in a track mode for centering the detectors on the plane of the laser beam. A circuit is provided for returning the slider to its home position should the beam be interrupted for a period of time, and also for returning the slider to its home position should no laser beam be detected. A stutter-start circuit is employed for operation in a track mode for a short time period after activation before switching to the search mode.
REFERENCES:
patent: 2713722 (1955-07-01), Henderson
patent: 3494426 (1970-02-01), Studebaker
patent: 3527539 (1970-09-01), Studebaker
patent: 3588249 (1971-06-01), Studebaker
patent: 3790277 (1974-02-01), Hogan
patent: 3819273 (1974-06-01), Unema
patent: 3857639 (1974-12-01), Mason
patent: 3894230 (1975-07-01), Rorden
Davidson Richard W.
Rando Joseph F.
Sobel Arthur
Buczinski S. C.
Spectra-Physics Inc.
Wilbur Maynard R.
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