Method and device for measuring inside diameters using a laser i

Details Method and device for measuring inside diameters using a laser i Method and device for measuring inside diameters using a laser i

1987-05-18

1989-03-28

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 61P, 356358, 33707, G01R 2726, G01B 1114

Patent

active

048167444

ABSTRACT:
A method and device for measuring the distance between first and second positions on an inside surface of a metal part that includes locating a metal probe within the part, applying a voltage across the probe and part, measuring the capacitance between the probe and part, moving the probe toward the first position until a predetermined capacitance is measured, moving the probe toward the second position until the predetermined capacitance is measured, determining the distance travelled by the probe between the first and second positions, and adding to the determined distance a known value to compensate for the width of the probe and the distance between the probe and part when the predetermined capacitance is measured.

REFERENCES:
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patent: 3393799 (1968-07-01), Schmersal
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patent: 3520613 (1970-07-01), Chitayat
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patent: 4225236 (1980-09-01), Sandercock
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patent: 4417816 (1983-11-01), Kindl et al.
patent: 4560924 (1985-12-01), Nordberg
patent: 4643577 (1987-02-01), Roth et al.

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