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高温环境下供电和导线联接困难,一般电子元件难以正常工作,因此高温环境下温度、压力等物理量的监测一直是一项较难解决的技术难题。新兴的硅酸钾镧(LGS)压电晶体具有良好的压电和高温特性,为声表面波(SAW)传感器的高温应用提供了可能。该文分析了新兴LGS压电晶体的高温及SAW特性,讨论了它在高温无线无源传感方面的应用途径和关键问题。初步的实验证明了基于LGS的高温SAW无线无源传感系统的可行性。  相似文献
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采用一种低成本、高效率的电路系统实现对谐振型无线无源声表面波(SAW)传感器的测试。该电路利用直接数字频率合成(DDS)技术产生不同频率的射频信号用以激励SAW传感器。在接收端采用功率探测器检测回波信号的包络,通过包络的变化得到待测物理化学参量的变化。该测试系统产生的激励信号功率最高可达10dBm,测试时间约为0.5s,与矢网测试结果相比,其测试相对误差仅为0.002 4%。实验结果表明,该系统能够稳定、可靠地实现谐振型SAW传感器的快速检测。  相似文献
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Wireless passive sensor networks play an important role in solving the energy limitation of nodes in the Internet of Things, and node scheduling is a significant method used to improve the energy utilization of nodes. In this work, an unused energy model based on analyzing the energy consumption characteristics of passive nodes is proposed because no unified model of passive sensor nodes is reported in previous studies. A rapid square partition clustering method is proposed according to the analysis of the relation between the sensing and communication radii of nodes, and the secondary grouping and node scheduling in each cluster are implemented to ensure the coverage rate of networks. Experimental results show that the state distribution of nodes in the proposed algorithm is favorable. The performance of the proposed algorithm is significantly affected by the P ratio between the working and charging powers of nodes. When the value of P is less than 100, the network coverage and connectivity rate are maintained at more than 95% and 90%, respectively, and are both higher than the existing algorithm.  相似文献
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