Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1976-02-19
1977-07-12
Wilbur, Maynard R.
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
33291, 318640, 318648, 356172, G01B 1126, G05B 106
Patent
active
040350843
ABSTRACT:
Transmitters generating rotating laser beams are commonly employed for surveying and earth working equipment control purposes. This invention relates to a method and apparatus for automatically maintaining the rotating laser beam in a required plane which is either exactly horizontal or at a known angle to the horizontal. The apparatus includes two remotely located laser beam reflectors which, when traversed by the rotating laser beam, respectively reflect the beam back to the transmitter along a path parallel to, but vertically displaced from the original path of the beam from the transmitter. Receiving equipment at the transmitter analyzes the vertical positions of the two reflected beams and effects any required correction of the position of the transmitter to maintain the rotating laser beam in the desired plane.
REFERENCES:
patent: 3471234 (1969-10-01), Studebaker
patent: 3588249 (1971-06-01), Studebaker et al.
patent: 3865491 (1975-02-01), Hogan
patent: 3936197 (1976-02-01), Aldrink et al.
Buczinski S. C.
Wilbur Maynard R.
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