| 摘要 |
<P>PROBLEM TO BE SOLVED: To precisely detect a magnetic field of high frequency without being influenced by a low frequency field such as an environmental magnetic field even in a low magnetic shielding environment. <P>SOLUTION: This magnetic detector comprises a low-pass filter 1 extracting a predetermined low-pass component from output signal of an integrator 14 generating detection output voltage Vout according to an object of magnetic field detection. According to the output signal of the low-pass filter, a magnetic field corresponding to the extracted low-pass component is generated in a compensation coil 3 and applied to a SQUID 10. According to the output of the integrator, a magnetic field of the corresponding magnitude is generated by a modulation coil 16 and supplied to the SQUID 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
