TY - CHAP
T1 - Low Frequency Eddy Current Testing to Measure Thickness of Double Layer Plates Made of Nonmagnetic Steel
AU - Tajima, Naoki
AU - Yusa, Noritaka
AU - Hashizume, Hidetoshi
N1 - Funding Information:
This work was supported in part by the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research (B) under Grant 15H04237. The experiments in this paper were supported by DAINICHI Machine and Engineering Co., Ltd. The authors thank Mr. Kazuma Takakura for his technical support during experiments.
Publisher Copyright:
© 2017 The authors and IOS Press. All rights reserved.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017
Y1 - 2017
N2 - This study attempts to apply low frequency eddy current testing to measure the thickness of double-layered plates which consist of two 304 austenitic stainless steel plates with a thickness of about 30 mm and an air gap with a thickness of 80 mm. The results of numerical simulations show that a change in the magnetic flux density due to the thickness change of the plates appears at the center of the coil when the diameter of the exciting coil is as large as 300 mm and the exciting frequency is in the low tens of Hertz. Experimental verifications were conducted using a magneto-impedance sensor whose sensitivity was 1 mV/nT and sensing range was from 0.2 nT to 2000 nT. We used a large diameter pancake exciting coil and a compensating coil to make up for the short of the range of the magnetic sensor during the measurements. The signals of the sensor situated at the center of the exciting coil changed with the thickness of the double-layered plates, which agrees with the result of the simulations.
AB - This study attempts to apply low frequency eddy current testing to measure the thickness of double-layered plates which consist of two 304 austenitic stainless steel plates with a thickness of about 30 mm and an air gap with a thickness of 80 mm. The results of numerical simulations show that a change in the magnetic flux density due to the thickness change of the plates appears at the center of the coil when the diameter of the exciting coil is as large as 300 mm and the exciting frequency is in the low tens of Hertz. Experimental verifications were conducted using a magneto-impedance sensor whose sensitivity was 1 mV/nT and sensing range was from 0.2 nT to 2000 nT. We used a large diameter pancake exciting coil and a compensating coil to make up for the short of the range of the magnetic sensor during the measurements. The signals of the sensor situated at the center of the exciting coil changed with the thickness of the double-layered plates, which agrees with the result of the simulations.
KW - Magneto-impedance sensor
KW - double structure
KW - pancake coil
KW - stainless steel
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U2 - 10.3233/978-1-61499-767-2-131
DO - 10.3233/978-1-61499-767-2-131
M3 - Chapter
AN - SCOPUS:85019996903
T3 - Studies in Applied Electromagnetics and Mechanics
SP - 131
EP - 138
BT - Electromagnetic Nondestructive Evaluation (XX)
A2 - Ribeiro, Artur Lopes
A2 - Ribeiro, Artur Lopes
A2 - Ramos, Helena Geirinhas
A2 - Ramos, Helena Geirinhas
PB - IOS Press
ER -