Transactions of the Society of Instrument and Control Engineers
Online ISSN : 1883-8189
Print ISSN : 0453-4654
ISSN-L : 0453-4654
An Application of Electromagnetic Thickness Sensor to Measurement of the Object Coated with Film
Takayuki YAMADAIsao SUZUKI
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1991 Volume 27 Issue 2 Pages 133-140

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Abstract
We had proposed and developed an electromagnetic thickness sensor which can measure the thickness of a conductor plate or tube coated with rust. However, our measurements were made under rust-free conditions in the previous paper. Therefore, this paper presents the measurement of simulated rusty objects. The theoretical analysis related to rust-free measurement is expanded accordingly. The effects of rust on measurement are discussed using this expanded analytical result. Experimental results for steel plates coated with Teflon film in place of rust verify that our method can measure the thickness of rusty objects and confirm that the upper limit of the measurement is about 2.5mm when the Teflon film thickness is 0.5mm.
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