Institute of Electronic and Control Systems, Technical University of Czestochowa, 17 A.K. Str., 42-200 Częstochowa, Poland.
Sensors (Basel). 2011;11(12):11809-32. doi: 10.3390/s111211809. Epub 2011 Dec 19.
In the paper a feasibility study on the use of surface acoustic wave (SAW) vibration sensors for electronic warning systems is presented. The system is assembled from concatenated SAW vibration sensors based on a SAW delay line manufactured on a surface of a piezoelectric plate. Vibrations of the plate are transformed into electric signals that allow identification of the sensor and localization of a threat. The theoretical study of sensor vibrations leads us to the simple isotropic model with one degree of freedom. This model allowed an explicit description of the sensor plate movement and identification of the vibrating sensor. Analysis of frequency response of the ST-cut quartz sensor plate and a damping speed of its impulse response has been conducted. The analysis above was the basis to determine the ranges of parameters for vibrating plates to be useful in electronic warning systems. Generally, operation of electronic warning systems with SAW vibration sensors is based on the analysis of signal phase changes at the working frequency of delay line after being transmitted via two circuits of concatenated four-terminal networks. Frequencies of phase changes are equal to resonance frequencies of vibrating plates of sensors. The amplitude of these phase changes is proportional to the amplitude of vibrations of a sensor plate. Both pieces of information may be sent and recorded jointly by a simple electrical unit.
本文提出了一种使用表面声波（SAW）振动传感器的电子预警系统的可行性研究。该系统由基于在压电板表面制造的 SAW 延迟线的串联 SAW 振动传感器组装而成。板的振动被转换为电信号，允许识别传感器和定位威胁。传感器振动的理论研究导致了具有一个自由度的简单各向同性模型。该模型允许对传感器板的运动进行显式描述，并识别出振动传感器。对 ST 切石英传感器板的频率响应和其脉冲响应的阻尼速度进行了分析。上述分析是确定在电子预警系统中有用的振动板参数范围的基础。通常，带有 SAW 振动传感器的电子预警系统的操作基于在通过两个串联的四端网络的电路传输后，在延迟线的工作频率下分析信号相位变化。相位变化的频率等于传感器振动板的共振频率。这些相位变化的幅度与传感器板振动的幅度成正比。这两条信息可以由一个简单的电气单元联合发送和记录。
