Highly sensitive anisotropic magnetoresistance magnetometer for Eddy-current nondestructive evaluation.
Using a commercially available anisotropic magnetoresistance (AMR) sensor of HMC1001, we developed a sensitive magnetometer. It could operate in amplifier mode or feedback mode. The magnetic field sensitivity of the AMR sensor was about 3.2 mV/V G. When the AMR sensor was biased by a voltage of 24 V, the magnetic field resolutions of the AMR magnetometer were about 12 pT/square root(Hz) at 1 kHz and 20 pT/square root(Hz) at 100 Hz. We used the AMR magnetometer for Eddy-current nondestructive evaluation in unshielded environment.
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Superconducting Materials Center, National Institute for Materials Science, 1-2-1 Sengen Tsukuba Ibaraki 305-0047, Japan. he.dongfeng@nims.go.jp
Tachiki
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Itozaki
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