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HTc RF-SQUID MAGNETOMETER AND ITS APPLICATION TO MAGNETOTELLURIC SOUNDING

Li Wenquan;Qiu Shangyong;Fang Shuju;Ren Guangqun;Zuo Zhancai(Dep.of Instrument Device)  
Two major difficulties,that is,the noise-caused out-of-locks and the pinned magnetic flux influences have to be solved before a flux-locked HTc RF-SQUIDmagnetometer can stably operate long hours in the field.A flux-locked HTc RF- SOUID magnetometer built with China- made bulk YBCO RF-SQUIDS can stablywork as long as 14000 seconds in the field enviroments without any out-Of-locks andmagnetic flux quantum jumps ,because a pinned magnetic flux suppressor for the HTc RF-SQUID and a series of techniques for the measurement and control system of themagnetometer have been used.At a measurement location of known earth strata,thecalculated resistance-ratio-curves based on the data measured with the HTc RF-SOUID magnetometer have proved nearly same as those curves given by the KIM-7802electromagnetic induction probe for magnetotelluric sounding
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