Laser displacement measurement system

Details Laser displacement measurement system Laser displacement measurement system

1999-02-22

2000-08-08

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

356 511, G01C 308, G01B 1124

Patent

active

061005401

ABSTRACT:
A laser displacement measurement system including a radiation source for transmitting radiation to a target, an R.F. transmitter oscillator for modulating the amplitude of the radiation at a first frequency, a detector for sensing the radiation reflected from the target, an R.F. local oscillator for providing an R.F. signal at a second frequency, a first mixer circuit, responsive to the oscillators for providing a local I.F. signal which is the difference between the first and second frequencies, a second mixer circuit, responsive to the detector and the R.F. local oscillator, for providing a reflected I.F. signal which is the difference between the second frequency and the modulation frequency of the reflected radiation, and a phase detector, responsive to the local and reflected I.F. signals, for detecting a first phase difference between the signals representative of the distance of the target.

REFERENCES:
patent: 4297030 (1981-10-01), Chaborski
patent: 5204732 (1993-04-01), Ohmamyuda et al.
patent: 5904170 (1999-08-01), Berg et al.

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