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声表面波传感器检测电路的研究 被引量：3

Research of the Surface Acoustic Wave Sensor Test Circuit
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摘要 针对目前声表面波(SAW)传感器检测电路的缺点,通过对SAW传感器信号的特征分析,设计了一种简单实用的SAW传感器检测电路,降低了硬件成本。该电路利用直接数字频率合成技术产生不同的频率信号,用以激励不同谐振频率的声表面波敏感元件,在间歇收发周期从SAW传感器输出信号中提取出反映被测量的频率信号,通过对该频率的测量得到被测物理量的变化。通过对SAW传感器的温度实验,获得了传感器的温度-频率特性,在较低频率(20MHz)时检测灵敏度可达1.36kHz/℃,具有较好的一致性;在较高频率(75MHz)时检测灵敏度可达2.03kHz/℃,存在一定偏差。 Aiming at the shortcoming of the present SAW sensor testing circuits, a simple and practical SAW sensor test circuit which saves hardware cost was designed by analyzing the features of the SAW sensor signals. In this circuit, the different frequency signals were produced by direct digital synthesis technology, and were applied to excite SAW sensors with different resonance frequencies. At the intermittent cycle, the frequency signal which reflects the measurement was extracted from the output signal of SAW sensor, and the change of the measured physical quantity was obtained by testing this frequency. The temperature-frequency characteristic was concluded by the SAW sensor temperature experiment. The test sensitivity is 1.36 kHz/℃ at the lower frequency （20 MHz）, and the circuit has the better consistency. The test sensitivity is 2.03 kHz/℃ at the higher frequency （75 MHz）, and the circuit has a little warp.
作者 李永刚 李炜 朱嘉林
机构地区 北京信息工程学院
出处 《微纳电子技术》 CAS 2008年第10期601-605,共5页 Micronanoelectronic Technology
基金 国家自然科学基金资助项目(60374040) 北京市自然科学基金项目(2063027)
关键词 声表面波 传感器 直接数字频率合成 测试电路 延迟线 SAW （surface acoustic wave） sensor direct digital synthesis test circuit delay line
分类号 TN65 [电子电信—电路与系统] TP212.9 [自动化与计算机技术—检测技术与自动化装置]
  • 相关文献

参考文献10

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共引文献21

同被引文献27

  • 1孔令兵,武明堂.声表面波湿度传感器[J].传感器技术,1993,12(4):12-15. 被引量：6
  • 2周世新,沈文军.一种雷达天线罩水密性检测方法[c]//2008年电子机械与微波结构工艺学术会议论文集,2008:193-195.
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引证文献3

二级引证文献8

微纳电子技术
2008年 第10期

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