Noise resistant laser system for machine alignment

Details Noise resistant laser system for machine alignment Noise resistant laser system for machine alignment

1993-03-29

1994-10-04

Buczinski, Stephen C.

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

356153, 250214B, G01B 1126, G01C 100

Patent

active

053531116

ABSTRACT:
A noise resistant laser system for machine alignment comprised of a semiconductor laser for producing a narrow collimated beam; a photodetector target for receiving the beam and producing four trains of output pulses which are indicative of the horizontal and vertical displacements of the laser beam from the center of the target; a crystal controlled oscillator for generating pulses at a frequency which is distinguishable from the frequencies of noise generated by industrial power supplies, industrial lighting and their harmonics; a closed loop control circuit for pulsing the laser at the distinguishable frequency; and a sample and hold circuit for sorting out components due to the beam displacement and suppressing components due to the industrial power supplies, industrial lighting and their harmonics. The closed loop control circuit is comprised of an interrupter, a feedback control circuit and a laser current control circuit. The interruper and the feedback control circuit are controlled by the crystal controlled oscillator. The feedback control circuit is responsive to the emission level of the laser to maintain a constant average emmision level. A display unit processes output signals from X/Y amplifiers at the output of the sample and hold circuit to enable an operator to perform a machine alignment.

REFERENCES:
patent: 3551057 (1970-12-01), Hamilton et al.
patent: 4518253 (1985-05-01), Takahashi
patent: 4712953 (1987-12-01), Witzel et al.
patent: 4732471 (1988-03-01), Cain et al.
patent: 4981354 (1991-01-01), DeHainaut et al.
patent: 4987293 (1991-01-01), Baciak
patent: 5148232 (1992-09-01), Duey et al.

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