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Proceedings Paper

High-temperature contactless position sensor based on giant magnetoresistive Agx-Co1-x alloy
Author(s): Sergio Arana; Enrique Castano; Javier Gracia
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Paper Abstract

A new circular position sensor based on giant magnetoresistances has been developed. The sensing film is an Agx-Co1-x nanogranular thin film patterned in a circular Wheatstone bridge configuration over an alumina substrate. This alloy shows a high magnetoresistance of 8% at room temperature within the field generated by a neodymium-iron-boron permanent magnet. The sensor provides a sensitivity of 440 μV/V/(degrees) with an input voltage of 5V. The operation temperature range of this device is -40 degrees C~+120 degrees C although the magnetic film withstands higher temperatures up to 200 degrees C. The sensor assembly is able to attach an electronic interface in the rear of the alumina substrate to amplify and compensate the output signal. These parameters and the contact-less way of sensing make this device suitable for automotive applications. In addition, the sensor is insensitive to contamination, and devoid of friction and electrical contact noise therefore the sensor have a long lifetime.

Paper Details

Date Published: 24 April 2003
PDF: 8 pages
Proc. SPIE 5116, Smart Sensors, Actuators, and MEMS, (24 April 2003); doi: 10.1117/12.498209
Show Author Affiliations
Sergio Arana, Ctr. de Estudios e Investigaciones Tecnicas (Spain)
Enrique Castano, Ctr. de Estudios e Investigaciones Tecnicas (Spain)
Javier Gracia, Ctr. de Estudios e Investigaciones Tecnicas (Spain)

Published in SPIE Proceedings Vol. 5116:
Smart Sensors, Actuators, and MEMS
Jung-Chih Chiao; Vijay K. Varadan; Carles Cané, Editor(s)

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