仪表技术与传感器
儀錶技術與傳感器
의표기술여전감기
Instrument Technique and Sensor
2015年
9期
28-30,34
,共4页
数据采集%磁力仪%超导量子干涉仪%磁场测量%直读电路%电磁兼容
數據採集%磁力儀%超導量子榦涉儀%磁場測量%直讀電路%電磁兼容
수거채집%자력의%초도양자간섭의%자장측량%직독전로%전자겸용
DAQ%magnetometer%SQUID%magnetic field measurement%direct readout circuit%EMC
针对地球物理勘探中高精度的磁场测量需求以及应用特点，文中采用一种新型的超导量子干涉仪（ SQUID）自举电路替代传统的SQUID磁通调制电路，从而可以简便的直读方式进行磁场测量。文中介绍了新型SQUID的程控直读电路，并重点阐述了由其构成的超导磁力仪软硬件设计方案以及测控实现；然后给出了此超导磁力仪在良好磁屏蔽环境中的性能测试以及电磁兼容评估的方法和结果，试验表明传感器的本底噪声约为6fT／ Hz；最后在上海横沙岛对基于SQUID自举电路研发的超导磁力仪整体性能进行了测试评估，试验表明该磁力仪达到实用要求，其在该地的测量磁场为7fT／ Hz＠1 kHz，与地球天然磁场在该频段的理论值基本相符。
針對地毬物理勘探中高精度的磁場測量需求以及應用特點，文中採用一種新型的超導量子榦涉儀（ SQUID）自舉電路替代傳統的SQUID磁通調製電路，從而可以簡便的直讀方式進行磁場測量。文中介紹瞭新型SQUID的程控直讀電路，併重點闡述瞭由其構成的超導磁力儀軟硬件設計方案以及測控實現；然後給齣瞭此超導磁力儀在良好磁屏蔽環境中的性能測試以及電磁兼容評估的方法和結果，試驗錶明傳感器的本底譟聲約為6fT／ Hz；最後在上海橫沙島對基于SQUID自舉電路研髮的超導磁力儀整體性能進行瞭測試評估，試驗錶明該磁力儀達到實用要求，其在該地的測量磁場為7fT／ Hz＠1 kHz，與地毬天然磁場在該頻段的理論值基本相符。
침대지구물리감탐중고정도적자장측량수구이급응용특점，문중채용일충신형적초도양자간섭의（ SQUID）자거전로체대전통적SQUID자통조제전로，종이가이간편적직독방식진행자장측량。문중개소료신형SQUID적정공직독전로，병중점천술료유기구성적초도자력의연경건설계방안이급측공실현；연후급출료차초도자력의재량호자병폐배경중적성능측시이급전자겸용평고적방법화결과，시험표명전감기적본저조성약위6fT／ Hz；최후재상해횡사도대기우SQUID자거전로연발적초도자력의정체성능진행료측시평고，시험표명해자력의체도실용요구，기재해지적측량자장위7fT／ Hz＠1 kHz，여지구천연자장재해빈단적이론치기본상부。
To meet the high precision magnetic field measurement requirements and application characteristics in geophysical exploration,the paper presented a new Superconducting QUantum Interference Device Bootstrap Circuit (SBC) which can replace the conventional flux modulation readout circuit to perform magnetic field measurement in a simple direct readout way .First of all , this paper introduced a programmable direct readout circuit of the SBC ,and then focused on the hardware and software design and implementation of measurement and control of a new superconducting magnetometer .Secondly ,the paper gived the method and the results of performance testing and electromagnetic compatibility assessment for the superconducting magnetometer in magnetic shiel -ding environment ,and the results show that the senor background noise is about 6fT/ Hz .Finally,a field trial have been done in Hengsha Island ,Shanghai to asset the overall performance of the new superconducting magnetometer ,and the results show that the magnetometer meet the practical requirements ,and the measured magnetic field background noise is about 7fT/ Hz @1kHz,basi-cally conforming to the theoretical value of the earth natural magnetic field in the frequency band .
