发明名称 |
MAGNETIC IMPEDANCE MEASURING DEVICE |
摘要 |
<p>An AC magnetic field of low frequency is applied to a measurement object and distribution of induced current is measured to detect distribution of the impedance characteristic of the measurement object. A magnetic impedance measuring device includes: an application coil for generating an AC magnetic field whose frequency can be varied and a power source for the application coil; at least a pair of magnetic sensor means formed by two magnetic sensors for detecting a vector component parallel to the application coil surface by a vector component orthogonal to the magnetic field generated by the measurement object; magnetic sensor measuring means arranged apart from the application coil surface to oppose to the measurement object for measuring a detection signal of the magnetic sensor means; a lock-in amplifier circuit for detecting a signal of the same frequency as the application coil from the output of the magnetic sensor measuring means; and analysis means for analyzing the output intensity and the phase change of the magnetic sensor by the output signal of the lock-in amplifier circuit.</p> |
申请公布号 |
WO2006109382(A1) |
申请公布日期 |
2006.10.19 |
申请号 |
WO2006JP304927 |
申请日期 |
2006.03.13 |
申请人 |
NATIONAL UNIVERSITY CORPORATION OKAYAMA UNIVERSITY;TSUKADA, KEIJI;KIWA, TOSHIHIKO |
发明人 |
TSUKADA, KEIJI;KIWA, TOSHIHIKO |
分类号 |
G01R31/302;G01N27/72;G01N27/82;G01R33/02 |
主分类号 |
G01R31/302 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|