DocumentCode :
1193264
Title :
High sensitive and heat-resistant magnetic sensor using magnetostrictive/Piezoelectric Laminate composite
Author :
Ueno, Toshiyuki ; Higuchi, Toshiro
Author_Institution :
Dept. of Precision Machinery Eng., Univ. of Tokyo, Japan
Volume :
41
Issue :
10
fYear :
2005
Firstpage :
3670
Lastpage :
3672
Abstract :
A highly sensitive and heat-resistant magnetic sensor using a magnetostrictive/piezoelectric laminate composite is investigated. The sensing principle is based on the magnetostrictive and piezoelectric effect, whereby a detected yoke displacement is transduced into a voltage on the piezoelectric materials. The sensor is intended to detect the displacement of a ferromagnetic object in a high temperature environment, where conventional magnetic sensors are not available. Such applications include sensors in automobile engines and machinery used in material processing. The sensor features combination of a laminate composite of magnetostrictive/piezoelectric materials with high Curie temperatures and an appropriate magnetic circuit to convert mechanical displacement to sensor voltages. This paper describes the sensing principle and demonstrates experimental results using a composite of Terfenol-D and Lithium Niobate to assure high sensitivity of 50 V/mm and a temperature operating range over 200°C.
Keywords :
laminates; lithium compounds; magnetic circuits; magnetic sensors; magnetostrictive devices; piezoelectric devices; piezoelectric materials; terbium compounds; LiNbO3; Tb0.27Dy0.73Fe1.9; Terfenol-D; displacement sensor; ferromagnetic object displacement; heat-resistant magnetic sensor; lithium niobate; magnetic circuits; magnetostrictive effects; magnetostrictive laminate composite; magnetostrictive materials; piezoelectric effects; piezoelectric laminate composite; piezoelectric materials; yoke displacement detection; Laminates; Magnetic sensors; Magnetostriction; Mechanical sensors; Object detection; Piezoelectric effect; Piezoelectric materials; Sensor phenomena and characterization; Temperature sensors; Voltage; Magnetostrictive material; displacement sensor; laminate composite; piezoelectric material;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2005.854795
Filename :
1519406
Link To Document :
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