Wall thickness inspection device
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United States of America Patent
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May 17, 2016
Grant Date -
Oct 1, 2015
app pub date -
Sep 24, 2013
filing date -
Sep 28, 2012
priority date (Note) -
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Abstract
A wall thickness inspection device includes an electrostatic capacity detector 4 for detecting the electrostatic capacity of a portion of an object subjected to wall thickness inspection, and an arithmetic and control unit for taking in the electrostatic capacity detected by the electrostatic capacity detector 4 and converting the electrostatic capacity to a wall thickness. The electrostatic capacity detector 4 includes a sensor unit 5 brought into contact with the surface of a portion of the object subjected to the wall thickness inspection, and an elastic body 6 for biasing the sensor unit 5 toward the portion of the object. The sensor unit 5 has a curved surface 50 with the radius of curvature R represented by 2 mm≦R≦10 mm. The curved surface 50 is formed by bonding an electrode sheet 7 made of synthetic resin having each electrode pattern formed thereon to a belt-like attachment substrate 51 so that at least the electrode pattern of a measurement electrode from among the electrode pattern of the measurement electrode and the electrode pattern of an earth electrode is positioned on the surface of a curved portion of the attachment substrate 51.
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