Method and apparatus for gap measurement between a graphite/epox

Details Method and apparatus for gap measurement between a graphite/epox Method and apparatus for gap measurement between a graphite/epox

1987-08-04

1989-03-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

73597, 324226, 324227, 324229, G01B 714, G01H 700, G01N 2772, G01N 2900

Patent

active

048147036

ABSTRACT:
A sensor including an eddy current loop and an ultrasonic transducer transmitting along a common axis is placed against a second surface of a graphite/epoxy composite structure whose first surface has been formed over the surface of a steel model. The eddy current coil can produce a signal measuring the separation between the sensor and the surface of the steel model, and the ultrasonic transduer can produce a signal representing the thickness of the graphite/epoxy composite panel. The distance and thickness signals are passed to electrical circuitry that computes their difference and displays the calibrated result as a measure of the gap between the steel model and the graphite/epoxy tool.

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