Touch probe and signal processing circuit therefor

Details Touch probe and signal processing circuit therefor Touch probe and signal processing circuit therefor

1993-12-16

1995-07-25

Fulton, Christopher W.

Geometrical instruments

Gauge

Movable contact probe, per se

33561, G01B 728

Patent

active

054350727

ABSTRACT:
A touch trigger probe incorporates piezoelectric sensors 50, whose outputs are processed by an interface circuit. The interface circuit discriminates between signals generated from the piezoelectric sensors 50 as a result of machine vibration and those generated as a result of a genuine measurement event, by the use of a timing circuit 90. The timing circuit 90 compares the time intervals (t.sub.1 -t.sub.2);(t.sub.2 -t.sub.3) between attainment of first 1.sub.1 and second 1.sub.2, and second 1.sub.2 and third 1.sub.3 output signal levels from the sensor 50, and upon the basis of this comparison validates (or rejects) measurements made with the probe. Additionally, the interface determines whether measurements made with the probe are taken upon the basis of outputs generated by the sensors 50 due to a shock wave in the stylus 24 of the probe, or as a result of strain in the stylus 24; as an alternative, measurements may be made only on the basis of strain.

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patent: 5083379 (1992-01-01), Enderle et al.
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