Development of the Plate Antenna and Research for ELF EMW at Deep Sea Bed

板式天线的研制及深海海底极低频电磁波研究

• 批准号: 10640410
• 负责人: SASAKI Hiroshi
• 金额: $ 1.92万
• 依托单位: Kochi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640410/
• 关键词: Plate Antenna; EM Wave in the Sea; ボールアンテナ

We succeeded to develop the plate antenna for the deep sea bed and obtained information on the electrical environment at the sea bed. The plate antenna system consist of two stainless steal plates of 20cm X 20cm X 1mm and the amplifier circuit with a gain of 2X10^4 in amplitude and the DAT for the data recording housed in a glass sphere. The performed minimum detectable amplitude of the system is 0.1 micro-Volts in the sea when we utilize the FWT (First Wavelet Transfer) method. So if we use the plate antenna with lOOm span, the minimum detectable voltage will be 10 nV.Due to the trouble of the floating device (Model TR6000, Benthos Inc), observation performed at the shallow sea bed instead of the deep sea bottom, more than lOOOm in depth. The observed electric field at depth 50m, near Usa bay is less than +- 10.5 micro volts which is governed by circuit noises.Comparison with the data of the EM pulses on land measured by the ball antenna and in the sea at depth 20m, we showed that the pulses under the segment layer of a thickness of 20m equivalent of sea water, can be detected with the present system in the case of their amplitude more than 100 mV.Moreover, we estimated the amplitude of the commercial AC signals at the 50m depth, at 5.47 km away from the Usa sea shore, as +-63 nV/m.

我们成功地开发了用于深海海底的平板天线，并获得了有关海底电环境的信息。平板天线系统由两块20 cm × 20 cm × 1 mm的不锈钢板和振幅增益为2 × 10^4的放大器电路组成，用于数据记录的DAT装在玻璃球中。当我们使用第一小波变换（FWT）方法时，系统在海洋中的最小可检测幅度为0.1微伏。因此，如果我们使用100 m跨度的平板天线，最小可检测电压将为10 nV。由于浮动装置（型号TR 6000，Benthos Inc）的故障，在浅海床而不是深海底部进行观测，深度超过1000 m。在美国湾附近50米深处观测到的电场小于± 10.5微伏，受电路噪声的影响，与陆地上球形天线测量的电磁脉冲和20米深处海水中的电磁脉冲资料比较表明，在20米厚的海水分段层下的电磁脉冲，此外，我们还估算了距美国海海岸5.47 km处50 m深处的商用交流信号的幅度为+-63 nV/m。

项目成果

V.A.Tsarev and H.Sasaki: "Low Frequency Seismogenic Electromagnetic Radiation : How Does It Propagate in the Earth's Crust and Where Can It Be Detected?"Atmospheric and Ionospheric Electromagnetic Phenomena Associated with Earthquakes (Ed,M,Hayakawa) TERR

V.A.Tsarev 和 H.Sasaki：“低频震源电磁辐射：它如何在地壳中传播以及在哪里可以检测到？”与地震相关的大气和电离层电磁现象 (Ed,M,Hayakawa) TERR

V.A.Tsarev and H.Sasaki: "Low Frequency Seismogenic Electromagnetic Radiation : How Does It Propagate in the Earth's Crust and Where can It Be Detected?"Atmospheric and Ionospheric Electromagnetic Phenomena Associated with Earthquakes (Ed.M.Hayak wa) (TER

V.A.Tsarev 和 H.Sasaki：“低频震源电磁辐射：它如何在地壳中传播以及在哪里可以检测到？”与地震相关的大气和电离层电磁现象 (Ed.M.Hayak wa) (TER

K.A.Kotelnikov,...H.Sasaki et.al: "Search for Charged Massive Particles of Dark Matter Using Satellite-Based Acoustic Detectors"Acoustical Physics. Vol.44. 61-67 (1998)

K.A.Kotelnikov,...H.Sasaki 等人：“使用基于卫星的声学探测器搜索暗物质的带电大质量粒子”声学物理学。

K.A.Koto l'nikov, ......, H.Sasaki, et al: "Search for Charged Massive Particles of Dark Matter using Satellite-Based Acoustic Detector"Acoustical Physics. Vol.44. 61-67 (1998)

K.A.Koto lnikov，......，H.Sasaki，等人：“使用基于卫星的声学探测器搜索暗物质的带电质量粒子”声学物理学。