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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >An interrogation unit for passive wireless SAW sensors based on Fourier transform
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An interrogation unit for passive wireless SAW sensors based on Fourier transform

机译：基于傅立叶变换的无源无线声表面波传感器的询问单元

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摘要

The application of surface acoustic wave (SAW) resonators as sensor elements for different physical parameters such as temperature, pressure, and force has been well-known for several years. The energy storage in the SAW and the direct conversion from physical parameter to a parameter of the wave, such as frequency or phase, enables the construction of a passive sensor that can be interrogated wireless. This paper presents a temperature-measurement system based on passive wireless SAW sensors. The principle of SAW sensors and SAW sensor interrogation is discussed briefly. A new measurement device developed for analyzing the sensor signals is introduced. Compared to former interrogation units that detect resonance frequency of the SAW resonator by comparing amplitudes of sensor response signals related to different stimulating frequencies, the new equipment is able to measure the resonance frequency directly by calculating a Fourier transformation of the resonator response signal. Measurement results of an experimental setup and field tests are presented and discussed.
机译：声表面波（SAW）谐振器作为传感器元件用于不同物理参数（例如温度，压力和力）的应用已经众所周知了几年。 SAW中的能量存储以及从物理参数到波的参数（例如频率或相位）的直接转换，可以构建可以无线查询的无源传感器。本文提出了一种基于无源无线声表面波传感器的温度测量系统。简要讨论了声表面波传感器的原理和声表面波传感器的询问。介绍了一种用于分析传感器信号的新型测量设备。与以前的通过比较与不同激励频率相关的传感器响应信号的幅度来检测SAW谐振器的谐振频率的询问单元相比，新设备能够通过计算谐振器响应信号的傅立叶变换直接测量谐振频率。介绍并讨论了实验装置和现场测试的测量结果。

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