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基于振动能量采集器的无源无线传感节点技术研究 被引量:4
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作者 李梦阳 董川 +2 位作者 唐翘楚 徐大诚 李昕欣 《传感技术学报》 CAS CSCD 北大核心 2016年第8期1260-1266,共7页
随着以MEMS技术为依托,结合压电效应的振动能量采集技术的日臻完善,如何利用振动能量采集器构成高效的无源无线传感节点成为近期研究热点,而能量采集器输出的电能储存控制和低功耗发射技术是实现该节点的难点。在设计出对储能电容电压... 随着以MEMS技术为依托,结合压电效应的振动能量采集技术的日臻完善,如何利用振动能量采集器构成高效的无源无线传感节点成为近期研究热点,而能量采集器输出的电能储存控制和低功耗发射技术是实现该节点的难点。在设计出对储能电容电压具有双阈值检测与控制功能的低功耗电路基础上,给出了一种自报警、无源无线低功耗传感节点。实验表明,在频率52 Hz正弦振动、振动加速度幅值为5 gn激励下,经过125 s的能量储存,节点能够以+10 d Bm功率在16 ms内完成发射及无线报警,发射距离可达1.31 km。该节点构成的无线传感网络可广泛应用于石油管线、桥梁和军事侦察等外部供电极度受限环境的现场监控等用途。 展开更多
关键词 自供电 无线传感节点 振动能量采集器 电源管理电路 双阈值检测 低功耗发射
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Compensation Method: New Perspectives
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作者 Boris Levin 《Journal of Physical Science and Application》 2014年第2期119-129,共11页
The compensation method aiming to reduce the irradiation on the user's body and to form a weak field area (a dark spot) in an antenna near region is considered. The results of the method development for the use in ... The compensation method aiming to reduce the irradiation on the user's body and to form a weak field area (a dark spot) in an antenna near region is considered. The results of the method development for the use in a narrow frequencies range are given. They show that under realistic conditions the compensation method allows reducing the irradiation power by a factor of 3-4 and more. The pattern changes are predictable and small, if the points of antennas placement are selected correctly. The dark spot necessity near the transmitter is not limited by mobile communication. A man often uses a low-power radio station, which is placed nearby in a vehicle, and it is necessary to protect from irradiation not only user but also other passengers. In the paper, it is shown that broadband field compensation can be achieved in various structures where the needed anti-phase fields are created either by identical antennas or by radiators located at equal distance from the compensation point, or by flat reflectors. 展开更多
关键词 Antenna theory COMPENSATION mobile antennas mutual coupling near fields
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