HT_cSQUID低频通信接收机和穿墙通信接收实验

发布时间：2018-03-01 02:30

本文关键词： HTcSQUID磁强计低频电磁波低频无线电通讯　出处：《物理学报》2014年19期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:Has tested a system and method capable of establishing wireless communications in water-bearing rock formations, soil and even seawater. The key components of the system, The high sensitive reception front end and receiver use the high critical temperature superconducting quantum interference device HTC squid magnetometer and the commercial high speed, high precision data acquisition and processing system. Currently, it is in the frequency range of 30 Hz to 100 kHz. The commercial HTcSQUID magnetometer can provide an inner magnetic field noise spectrum density better than 100 fT/Hz1/2. At the same time, the commercial data acquisition and processing system can modulate and collect the transmitted information by software. Demodulation and analysis. The HTcSQUID magnetometer has the characteristics of high sensitivity and small volume of low frequency magnetic field by using the low frequency electromagnetic wave with large penetration depth in conductive medium and the high sensitivity of low frequency magnetic field of HTcSQUID magnetometer. For a mobile low-frequency radio communication system that can be used in underground (rock and soil) and underwater (seawater) environments, Using a square coil with an area of 1 m2 as the radiator of the test signal (transmitting antenna), the sensor of the SQUID magnetometer is enclosed in an electromagnetic shield which can provide a large attenuation to the ultra-low frequency test signal. The 99 Hz amplitude modulation signal radiated by the transmitting coil has been successfully received, so it is proved that the radio communication with practical value can be established on the ground and hundreds of meters underground by using HTcSQUID technology.
【作者单位】：北京大学应用超导研究中心;北京大学介观物理和人工微结构国家重点实验室;北京大学物理学院;
【基金】：国家重点基础研究发展计划(973计划)(批准号:2011CBA00106)资助的课题~~
【分类号】：TN92

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