实验室岩石变形电磁信号的观测系统
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摘要
为了能观测到岩石变形产生的微弱的电磁信号,需要建立一套相应的实验观测系统。典型岩石实验表明,在考虑到变形电磁实验的种种特殊要求,认真选择观测设备,并进行了严格误差校正之后,可以获得可靠的岩石变形过程的电磁辐射信号。并且在机械振动激发条件下,无论岩石是否含有石英,都会产生足够强的电磁辐射信号。但是其中,石英晶体的敲击电磁信号最强,频率最高。该结果对研究地震的电磁现象具有一定的参考价值和指导意义。
The electromagnetic emissions(EMEs) produced during rock deformation are very faint and tiny,so that the measurements of them require excellent capabilities of detection system. Some rock impacting and rock compressing experiments were made for testing the system. The reliability of the results of electromagnetic emission experiment,therefore,depends greatly on the reasonable technical specifications of high sensitivity recorder and effectively controlled electromagnetic background. The tests have proved that the system is reliable and the data quality is improved greatly. The results show that with a sudden mechanical vibration,regardless can whether the rock contains quartz,a strong enough electromagnetic radiation signal can be generated and received by the new system. The amplitude from quartz crystal is the strongest and the frequency highest. The research has certain significance in the abstract and foreground in the application for the study of seismic electromagnetic phenomenon.
The electromagnetic emissions(EMEs) produced during rock deformation are very faint and tiny,so that the measurements of them require excellent capabilities of detection system. Some rock impacting and rock compressing experiments were made for testing the system. The reliability of the results of electromagnetic emission experiment,therefore,depends greatly on the reasonable technical specifications of high sensitivity recorder and effectively controlled electromagnetic background. The tests have proved that the system is reliable and the data quality is improved greatly. The results show that with a sudden mechanical vibration,regardless can whether the rock contains quartz,a strong enough electromagnetic radiation signal can be generated and received by the new system. The amplitude from quartz crystal is the strongest and the frequency highest. The research has certain significance in the abstract and foreground in the application for the study of seismic electromagnetic phenomenon.
引文
[1]王恩元,赵恩来.岩石单轴压缩过程的电磁辐射特性实验研究[J].辽宁工程技术大学学报,2007,26(1):56-58.
[2]钱书清,任克新,吕智.伴随岩石破裂的VLF、MF、HF和VHF电磁辐射特性的实验研究[J].地震学报,1996,18(3):346-351.
[3]钱书清,任克新,吕智.地震电磁辐射前兆不同步现象物理机制的实验研究[J].地震学报,1998,20(5):535-540.
[4]钱书清,张以勤,曹惠馨,等.岩石破裂时产生电磁脉冲的观测与研究[J].地震学报,1986,8(3):301-308.
[5]王恩元.受载岩石电磁辐射特性及其应用研究[J].岩石力学与工程学报,2002,21(10):1473-1477.
[6]郭自强,郭子棋,钱书清,等.岩石破裂中的电声效应[J].地球物理学报,1999,42(1):74-83.
[7]曹惠馨,钱书清.岩石破裂过程中超长波段的电磁信号和声发射的实验研究[J].地震学报,1994(5):235-241.
[8]I.Yamada,K.Masuda,H.Mizutani.Electromagnetic and acoustic emission associated with rock fracture[J].Physics of the Earth and Planetary Interiors,1989,57:157-168.
[9]何学秋,王恩元.煤岩流变电磁动力学[M].北京:科学出版社,2003.
[2]钱书清,任克新,吕智.伴随岩石破裂的VLF、MF、HF和VHF电磁辐射特性的实验研究[J].地震学报,1996,18(3):346-351.
[3]钱书清,任克新,吕智.地震电磁辐射前兆不同步现象物理机制的实验研究[J].地震学报,1998,20(5):535-540.
[4]钱书清,张以勤,曹惠馨,等.岩石破裂时产生电磁脉冲的观测与研究[J].地震学报,1986,8(3):301-308.
[5]王恩元.受载岩石电磁辐射特性及其应用研究[J].岩石力学与工程学报,2002,21(10):1473-1477.
[6]郭自强,郭子棋,钱书清,等.岩石破裂中的电声效应[J].地球物理学报,1999,42(1):74-83.
[7]曹惠馨,钱书清.岩石破裂过程中超长波段的电磁信号和声发射的实验研究[J].地震学报,1994(5):235-241.
[8]I.Yamada,K.Masuda,H.Mizutani.Electromagnetic and acoustic emission associated with rock fracture[J].Physics of the Earth and Planetary Interiors,1989,57:157-168.
[9]何学秋,王恩元.煤岩流变电磁动力学[M].北京:科学出版社,2003.
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