Laser range finder with non-linearity compensation

Details Laser range finder with non-linearity compensation Laser range finder with non-linearity compensation

1984-03-07

1986-09-23

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

343 73, 343 13R, 367 99, 367101, 367102, G01C 308

Patent

active

046132317

ABSTRACT:
The receiver (3') of a laser range finder operating on the pulse propagation and including a transmitter unit (1) and a first receiver unit (2) is sampled by a spike pulse (5) derived from the transmitter pulse in such a way as to produce a low-frequency representation (10). The non-linearity of the phase modulation of this spike pulse, which is detrimental in very accurate measurements taken over long distances, is eliminated in that the oscillations of high-frequency oscillator (8) are supplied to a second receiver unit (2') in which they are scanned by the same spike pulse (5) and are then also suitably transformed into a low-frequency representation (10'). A counter (12) then counts the low-frequency zero-passages of the oscillator, beginning with the onset of the low-frequency cycle, thereby eliminating all errors (FIG. 1).

REFERENCES:
patent: 3900260 (1975-08-01), Wendt

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