Dynamic control arrangement for a distance measuring apparatus

Details Dynamic control arrangement for a distance measuring apparatus Dynamic control arrangement for a distance measuring apparatus

1982-06-07

1985-02-12

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, G01C 308

Patent

active

044987641

ABSTRACT:
The invention provides a distance measuring apparatus for determining the distance of a target object as a function of the transit time of a measurement light pulse which is emitted by a transmitter in the transmission portion of the apparatus towards the target object, reflected thereby and received by the receiving portion of the measuring apparatus and for attainment of superior measurement accuracy the intensity of the measurement light pulse is correlated to the distance and reflectivity of the target object as well as to the "transparency" of the transmission medium between the measuring apparatus and the target object, such correlation being effected by optical damping of either the transmitted light pulses and/or the reference light pulse and/or the light pulses reflected by the target. Optical damping may advantageously be effected by means of a light path change-over switch which feeds a light pulse, generated by the transmitter by controlling the timing of a trigger generator for the transmitter, so that the full intensity or attenuated optic light is passed either into a transmitting measurement light path or into a reference light path having a known transit time for the reference light therein, electrical delays inherent in the apparatus and causing errors in distance measurement being compensated for by subtracting the transit time measurement values of reference light pulses from transit time measurement values of transmitted measurement light pulses.

REFERENCES:
patent: 2956472 (1960-10-01), Hildebrand
patent: 3402630 (1968-09-01), Blau et al.
patent: 3519829 (1970-07-01), Pradel et al.
patent: 3619058 (1971-11-01), Hewlett et al.
patent: 3652161 (1972-03-01), Ross
patent: 3779645 (1973-12-01), Nakazawa et al.
patent: 3802775 (1974-04-01), Hughes
patent: 3813165 (1974-05-01), Hines et al.
patent: 3941999 (1976-03-01), Moyers, Jr.
patent: 4297030 (1981-10-01), Chaborski

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