Low Conductivity Material Detection Method Based on Eddy Current and GMR Sensors

Abstract:

The low conductivity material such as cancellous bone, cortical bone tissue and soft tissue is the mainly content in the spine. And the improvements on distinguishing the low conductivity material can make a contribution to the spinal fixation surgery process, and protect the patient from spine incident trauma injury during internal fixation prosthetics with implanting pedicle screws. As a result the low conductivity material detection is of great importance in biomedicine study. According to the magnetic property difference of different low conductivity material, an eddy current detection method based on GMR sensor which is proposed in this paper. Compared with coil sensor in traditional non-contact detecting system, GMR sensors have advantages of higher sensitivity, higher precision, better linearity and better stability. Based on this methods, this paper introduces a low conductivity material detection probe. Several experiments indicate that this detection method can detect the low conductivity material NaCl solution with conductivity of 0.128 S/m, whose electrical conductivity matches that of biological tissue. This results lay a solid foundation on the biological tissue detection research.

• Periodical: Applied Mechanics and Materials (Volume 742)
• Pages: 99-104
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.742.99
• Online since: March 2015
• Authors: Kai Jiang, Hua Ming Lei, Hui Zhao*
• Keywords: Eddy Current Detection, GMR, Low Conductivity Material, Non-Contact Detection

References

[1] Weiwen Liu, Kai Jiang, Localization and Recognition of Different Vertebra Tissues based on Eddy Current Detection Method[J]. Advanced Materials Research. vol 740(2013), pp.128-133.

DOI: 10.4028/www.scientific.net/amr.740.128

[2] Hideo Matsui, Hirofumi Anno. Relatively small size linitis plastica of the stomach: multislice CT detection of tissue fibrosis[J], Abdominal Imaging, vol 32(6) 2007, pp.694-697.

DOI: 10.1007/s00261-006-9171-3

[3] Lu M, Ueno S. Calculating the current density and electric field in human head by multicannel transcranial magnetic stimulation[j]. IEEE Transactions On Magnetics, vol 45(3) 2009, pp.1662-1665.

DOI: 10.1109/tmag.2009.2012770

[4] Zolgharni M, Ledger PD. Imaging cerebral haemorrhage with magnetic induction tomography numerical modeling [J]. Physiological Measurement, vol 30(6) 2009, pp.187-200.

DOI: 10.1088/0967-3334/30/6/s13

[5] Johannes Netzt, Ewald Fornert, Sabine Haagemannt. Contactless impedance measurement by magnetic induction - a possible method for investigation of brain impedance[J]. Physiological Measurement, vol 14(4) 1993, pp.463-471.

DOI: 10.1088/0967-3334/14/4/007

[6] Saulnier GJ , Blue RS, Newell JC. Electrical Impedance Tomography[J]. IEEE Signal Processing Magazine, vol 18(6) 2001, pp.31-43.

DOI: 10.1109/79.962276

[7] Qin Mingxin, Dong Xiuzhen, You Fusheng. The System of Bio-electrical Impedance Tomography for Detecting Lung Function[J]. CT Theory and Applications, vol 9(2000), pp.133-137.

[8] LI Liang, QUE Pei-wen, CHEN Liang. Application of Magnetic Flux Leakage Method in Pipline Based on Giant Magneto-resistance sensor[J]. Instrument Technique and Sensor, vol 12(2005), pp.44-46.

[9] XIAO You zhuan, ZENG Rong wei. Application of GMR Sensor[J]. Journal of Magnetic Materials and Devices, 32(2) 2001, pp.40-44, 49.

[10] Wang Chenglong, Liu Weiwen, Zhao Hui. Study on Method of Materials Identification Based on Eddy Current Sensor with Three Serial Reversed Coils[J]. Computer Measurement& Control, vol 20(6) 2012, pp.1669-1671, 1675.