AMR gradiometer for mine detection

Anisotropic magnetoresistors (AMRs) are used to build an advanced mine detector. The sensing head involves a gradiometric pair of AMR sensors and a continuous-wave driven excitation coil, so the gradiometer is capable of detection of ferromagnetic materials as well as diamagnetic metals. The sensors...

Full description

Saved in:
Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2012-10, Vol.186, p.100-104
Main Authors: Vyhnánek, Jan, Janošek, Michal, Ripka, Pavel
Format: Article
Language:English
Subjects:
Actuators
AMR
Construction
Eddy currents
Electronics
Excitation
Ferromagnetic materials
Gradiometer
Magnetic measurements
Magnetic sensors
Mine detection
Mine detectors
Sensors
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Anisotropic magnetoresistors (AMRs) are used to build an advanced mine detector. The sensing head involves a gradiometric pair of AMR sensors and a continuous-wave driven excitation coil, so the gradiometer is capable of detection of ferromagnetic materials as well as diamagnetic metals. The sensors are specially arranged to suppress the large AC-excitation field, so the mine detector senses both DC and AC field gradient responses of the object of interest. Being limited by the sensor and electronics noise of 268pT/√Hz at 1kHz, we were able to detect a 50mm×50mm×1.5mm aluminum test object in a 20cm depth using a 150μT, 1-kHz excitation field.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2012.03.007