Sensing circuit for position-sensing probe

Details Sensing circuit for position-sensing probe Sensing circuit for position-sensing probe

1992-07-20

1994-03-22

Cuchlinski, Jr., William A.

Geometrical instruments

Gauge

Movable contact probe, per se

33558, 33DIG13, G01B 718

Patent

active

052953076

ABSTRACT:
A touch trigger probe for machine tools or coordinate measuring machines has three strain gauges SG1-3 which react to deflection of a stylus of the probe, causing a trigger signal to be generated in signal processing circuitry SP. To reduce power consumption, and thus to reduce thermal growth of the probe, the strain gauges are fed by constant current sources CS1-3. The sources CS1-3 are servo controlled from a reference resistance R.sub.ref and constant current source CS4, by an amplifier A4.

REFERENCES:
patent: 4213348 (1980-07-01), Reinertson et al.
patent: 4462162 (1984-07-01), McMurtry
patent: 4622751 (1986-11-01), Berg
patent: 4637263 (1987-01-01), Fritz et al.
patent: 4817362 (1989-04-01), Archer
patent: 4818151 (1989-03-01), Hajdukiewicz et al.
Database WPIL, Week 8032, Derwent Publications Ltd., London, GB; AN 80-G9597C (Medasonics Inc) Jul. 23, 1980.

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