STUDY ON THE ELECTROMAGNETIC ENVIROMENT ON THE SEA BED FOR THE NUCLEARITE SEARCH

核矿搜寻海底电磁环境研究

• 批准号: 06452033
• 负责人: SASAKI Hiroshi
• 金额: $ 3.2万
• 依托单位: KOCHI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452033/
• 关键词: Nuclearite; Electromagnetic Wave in the sea; ELF; VLF radio wave; Ball Antenna; Rock Fracture; Micro-fracture; SQM; ELF電磁波; VLF電磁波

In order to investigate electromagnetic (EM) waves emitted from the rock fracture region along the passage of Nuclearites, we have developed an extremely low frequency (ELF) and very low frequency (VLF) EM observation system working in the sea. Development of the ball antenna system as a sensor of EM waves (without any contact to the sea water) and the instrumental amplifier with high CMRR,manufacturing the housing and framework for the ball antenna system, acquisition of the flotation technique, all these were done. The minimum detectable amplitude by the ball antenna system was eached to <plus-minus>20 mu V/1.6The electric field at the shallow seabed was measured many times to investigate experimantally the pulse wave forms at the seabed propagated from the source region of the rock fracture though the crust under the seabed. Theoretical analysis of the propagation of atmospheric EM waves from the air to the seabed performed, that is we investigated the effect of reflection at the sea surface and attenuation in the sea water and the expected pulse wave form in the sea was simulated using the real pulse wave form measured in the atmosphere. We found good correlation between the measured signals in the sea and the simulated them.Another results is related to the mechanism of radiation of EM waves from the rock fracture region. We developed a new model of the radiation EM waves at the microfracturing of the rock, namely we offer the "Wash Board Model" to be published in near future.

为了研究核爆体在岩石裂隙区沿着传播的电磁波，我们研制了一套极低频（ELF）和甚低频（VLF）电磁观测系统。开发了作为电磁波传感器的球形天线系统（与海水没有任何接触）和具有高CMRR的仪器放大器，制造了球形天线系统的外壳和框架，获得了漂浮技术，所有这些都完成了。球天线系统的最小可探测幅度达到<plus-minus>20 μ V/1.6。为了实验研究岩石破裂源区通过海底地壳传播的海底脉冲波形，多次测量了浅海底电场。对大气电磁波从空气到海底的传播进行了理论分析，即研究了大气电磁波在海面的反射和在海水中的衰减效应，并利用大气中测量的真实的脉冲波形模拟了海洋中期望的脉冲波形。实验结果表明，模拟信号与实测信号有较好的相关性，并对岩石裂隙区电磁波辐射机理进行了探讨。本文提出了一种新的岩石微破裂辐射电磁波模型，即“搓板模型”。

项目成果

H.Sasaki: "Technique on the measurement of electromagnetic radiation in the sea" Gekkann Chikyuu. Vol.7, No.8. 548-554 (1995)

H.Sasaki：“测量海洋电磁辐射的技术”Gekkann Chikyuu。

H.Sasaki, N.Ohmori, T.Nakamura et al.: "Study on the ELF/VLF Noise for the Nuclearites Search Experiment" Proc.24th Int.Cosmic Ray Conf., Rome. Vol.1. 1064-1067 (1995)

H.Sasaki、N.Ohmori、T.Nakamura 等人：“核子搜索实验的 ELF/VLF 噪声研究”Proc.24th Int.Cosmic Ray Conf.，罗马。

H.Sasaki, K.Tsuji, M.Itoh et al.: "ELF Electromagnetic Wave Observation System on the Seabed" Terra Scientific Publishing Company, Edt.by M.Hayakawa and S.Fuginawa. 193-204 (1994)

H.Sasaki、K.Tsuji、M.Itoh 等人：“海底 ELF 电磁波观测系统”Terra Scientific Publishing Company，M.Hayakawa 和 S.Fuginawa 编辑。

V.CHECHIN et al.: "Global ELF/VLF Wave Observation at the SL-9 Comet Crash ON Jupiter" Proc.24th Int.Cosmic Ray Conf.Rome. 4. 1168-1171 (1995)

V.CHECHIN 等人：“木星 SL-9 彗星坠毁处的全球 ELF/VLF 波观测”Proc.24th Int.Cosmic Ray Conf.Rome。

V.Chechin, H.Sasaki, V.Tsuarev et al.: "Global ELF/VLF Wave Observation at the SL-9 Comet Crash on Jupiter" Proc.24th Int.Cosmic Ray Conf., Rome. Vol.4. 1168-1171 (1995)

V.Chechin、H.Sasaki、V.Tsuarev 等人：“SL-9 彗星撞击木星时的全球 ELF/VLF 波观测”Proc.24th Int.Cosmic Ray Conf.，罗马。