Crack opening displacement gage

Details Crack opening displacement gage Crack opening displacement gage

1977-04-04

1978-07-04

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

G01B 500

Patent

active

040980006

ABSTRACT:
An electrical transducer for measuring changes in the size of crack openings. The device is designed to operate at temperatures up to and exceeding 1500.degree. F., is portable, compact, easy to use and reuseable. The device comprises a differential capacitive sensing assembly, arm-like members each including an arm assembly for transmitting the change in crack opening from the crack to the sensing assembly, a flexural pivot to facilitate movement of the arm-like members with changes in the crack opening and means for anchoring the device in the crack. The differential capacitive displacement assembly comprises a plurality of capacitor plates, with the reference excitation plates coupled to one arm assembly and the movable sensing plate coupled to another arm assembly. A bridge circuit couples to the differential capacitive sensing assembly for electrically sensing capacitive variations occasioned by crack opening displacements.

REFERENCES:
patent: 1431638 (1922-10-01), Dowling
patent: 1816464 (1931-07-01), Biggert
patent: 1958424 (1934-05-01), Gebhard
patent: 2138411 (1938-11-01), Tornebohn
patent: 3221256 (1965-11-01), Walden
patent: 3702957 (1972-11-01), Wolfendale

Affiliated with

Also associated with

Rating

Crack opening displacement gage does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Crack opening displacement gage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crack opening displacement gage will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-271245