Paper Title:
High Accuracy AMR Magnetometer and its Application to Vehicle Detection
  Abstract

The anisotropic magnetoresistive (AMR) sensors provide an excellent means of measuring the earth’s magnetic field. Low cost, high sensitivity, small size, noise immunity, and reliability are advantages of AMR sensor over other electrical alternatives. But the sensitivity of constant voltage biased AMR sensor changes greatly with the temperature of surrounding and cross-axis field. In this paper, constant current bias is used in order to reduce the sensitivity temperature coefficient of AMR sensor. At the same time, cross-axis field compensation is taken based on iteration. The results of experiment show that the sensitivity of HMC100x without cross-axis field compensation varies greatly with the variation of cross-axis field, the sensitivity of HMC100x with cross-axis field compensation is stable. It can be seen that proposed sensitivity compensation method is effective. Developed magnetometer is used for vehicle detection. Experimental results show that developed magnetometer is capable of detecting vehicle and its output variation curve shape is different for the ferrous cart moves over sensor along different direction.

  Info
Periodical
Advanced Materials Research (Volumes 443-444)
Chapter
Chapter 1: Advances in Manufacturing Engineering Techniques and Materials Science
Edited by
Li Jian
Pages
150-155
DOI
10.4028/www.scientific.net/AMR.443-444.150
Citation
X. S. Li, R. Q. Kang, Y. X. Liu, Z. H. Wang, X. Y. Shu, "High Accuracy AMR Magnetometer and its Application to Vehicle Detection", Advanced Materials Research, Vols. 443-444, pp. 150-155, 2012
Online since
January 2012
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Price
$32.00
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