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试验了一种能够在含水的岩层、土壤甚至海水中建立起无线通信的系统和方法.该系统的关键部件,高灵敏接收前端和接收机使用的是商品级高温超导量子干涉仪(high critical temperature superconducting quantum interference device,HTcSQUID)磁强计和商用高速、高精度数据采集处理系统.目前在从30 Hz到100 kHz频段内,商品级HTcSQUID磁强计可以提供优于100 fT/Hz1/2的内秉磁场噪声谱密度,同时商用数据采集处理系统可通过软件实现对传输信息的调制、采集、解调和分析.利用低频电磁波在导电介质中有较大穿透深度以及HTcSQUID磁强计低频磁场灵敏度高、体积小的特点,对于一种能在地下(岩石和土壤)和水下(海水)环境中使用的可移动式低频无线电通讯系统实现的可行性,进行了初步讨论.使用面积等于1 m2的方形线圈作为测试信号的辐射体(发射天线),将SQUID磁强计的传感器封闭在一个能对超低频测试信号提供较大衰减的电磁屏蔽体中,成功地接收到了发射线圈辐射的99 Hz调幅信号.因此证明,采用HTcSQUID技术,可以在地面与数百米深的地下建立起有实用价值的无线电通信.
A system and method to establish wireless communication in water-bearing rock formations, soils and even seawater was tested.The key components of this system, the highly sensitive receive front-end and the receiver, were commercial high-temperature superconducting quantum interferometers magnetometer and commercially available high-speed, high-precision data acquisition and processing system, the commercial HTcSQUID magnetometer now offers better than 100 fT / Hz1 / 2 Within the magnetic field noise spectral density, while commercial data acquisition and processing system can be achieved through software modulation, acquisition, demodulation and analysis of the transmission information. The use of low frequency electromagnetic waves in the conductive medium has a greater penetration depth and HTcSQUID magnetometer low frequency magnetic field High sensitivity and small volume, and discussed the feasibility of realizing a mobile low-frequency radio communication system which can be used underground (rock and soil) and underwater (seawater) environment.The area of use is equal to 1 m2 square coil as a test signal radiator (transmitting antenna), the SQUID magnetometer sensor enclosed in a pair of The ultra-low frequency test signal provides a large attenuation of the electromagnetic shielding body, successfully received the transmitting coil radiation 99 Hz AM signal.Therefore, using HTcSQUID technology, can be established in the ground and hundreds of meters deep underground have practical value Radiocommunication.