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System and methods for wireless communication that could go through hydrous rocks, seawater, and even soil are investigated. The key components of the system are the high sensitive receivers of commercial HighTcSQUID and high-speed signal acquisition and processing systems. Within the frequency band of 30 Hz to 100 kHZ, the intrinsic noise spectral density of commercial HTcSQUID could be as good as 100 fT/Hz1/2, so that with commercial software, signals could be accurately modulated, collected,demodulated and processed. In the low frequency end, with the features of long penetration depth of electromagnetic wave and high sensitive, small size of HTcSQUID magnetometer, the feasibility of the implementation of portable low-frequency wireless communication system which could be used both under ground and water is discussed preliminarily. Using a 1 m2 square coil as test signal transmitting antenna, with the HTcSQUID magnetometer receiving sensor placed in an electromagnetic shielding cavity which could provide considerable electromagnetic attenuation, the 99 Hz AM signal emitted by the transmitting antenna is successfully collected. The result proves that with the technology of HTcSQUID, practical wireless communications can be realized between the earth's surface and a depth of hundreds of meters underground.
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Keywords:
- HTcSQUID magnetometer /
- low frequency electromagnetic wave /
- low frequency radio communication
[1] Wolf S A, Davis J R, Nisenoff M 1974 IEEE Trans. Commun. 22 549
[2] Davis J R, Dinger R J, Goldstein J A 1977 IEEE Trans. Antennas Propag. 25 223
[3] Bednorz J G, Mller K A 1986 Z. Phys. B Condensed Matter 64 189
[4] Zhao Z X, Chen L Q, Yang Q S, Huang Y Z, Chen G H, Tang R M, Liu G R, Cui C G, Chen L, Wang L Z, Guo S Q, Li S L, Bi J Q 1987 Chin. Sci. Bull. 32 412(in Chinese) [赵忠贤, 陈立泉, 杨乾声, 黄玉珍, 陈赓华, 唐汝明, 刘贵荣, 崔长庚, 陈烈, 王连忠, 郭树权, 李山林, 毕建清 1987 科学通报 32 412]
[5] Reagor D, Fan Y, Mombourquette C, Jia Q, Stolarczyk L 1997 IEEE Trans. Appl. Superconduct. 7 3845
[6] Vasquez J, Rodriguez V, Reagor D 2004 IEEE Trans. Appl. Superconduct. 14 46
[7] Zhang M J, Lang P L, Peng Z H, Chen Y F, Chen K, Zheng D N 2006 Chin. Phys. 15 1903
[8] Gu H F, Cai W Y, Wei Y K, Liu Z H, Wang Q, Wang Y, Dai Y D, Ma P 2012 Chin. Phys. B 21 040702
[9] Zhao K H, Chen X M 2003 Electromagnetism (Beijing: Higher Education Press) p355 (in Chinese) [赵凯华, 陈熙谋 2003 电磁学(北京: 高等教育出版社)第355页]
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[1] Wolf S A, Davis J R, Nisenoff M 1974 IEEE Trans. Commun. 22 549
[2] Davis J R, Dinger R J, Goldstein J A 1977 IEEE Trans. Antennas Propag. 25 223
[3] Bednorz J G, Mller K A 1986 Z. Phys. B Condensed Matter 64 189
[4] Zhao Z X, Chen L Q, Yang Q S, Huang Y Z, Chen G H, Tang R M, Liu G R, Cui C G, Chen L, Wang L Z, Guo S Q, Li S L, Bi J Q 1987 Chin. Sci. Bull. 32 412(in Chinese) [赵忠贤, 陈立泉, 杨乾声, 黄玉珍, 陈赓华, 唐汝明, 刘贵荣, 崔长庚, 陈烈, 王连忠, 郭树权, 李山林, 毕建清 1987 科学通报 32 412]
[5] Reagor D, Fan Y, Mombourquette C, Jia Q, Stolarczyk L 1997 IEEE Trans. Appl. Superconduct. 7 3845
[6] Vasquez J, Rodriguez V, Reagor D 2004 IEEE Trans. Appl. Superconduct. 14 46
[7] Zhang M J, Lang P L, Peng Z H, Chen Y F, Chen K, Zheng D N 2006 Chin. Phys. 15 1903
[8] Gu H F, Cai W Y, Wei Y K, Liu Z H, Wang Q, Wang Y, Dai Y D, Ma P 2012 Chin. Phys. B 21 040702
[9] Zhao K H, Chen X M 2003 Electromagnetism (Beijing: Higher Education Press) p355 (in Chinese) [赵凯华, 陈熙谋 2003 电磁学(北京: 高等教育出版社)第355页]
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