A surface acoustic wave response detection method for passive wireless torque sensor
A surface acoustic wave response detection method for passive wireless torque sensor
复制标题
一种无源无线扭矩传感器的声表面波响应检测方法
DOI：
10.1063/1.5003178
复制
发表时间：
2018
期刊：
影响因子：
1.6
通讯作者：
Ji Xiaojun
中科院分区：
文献类型：
--
作者：
Fan Yanping;Liu Hongye;Kong Ping;Qi Hongli;Ji Xiaojun
为提高无源无线声表面波扭矩传感器的测量精度，提出了一种有效的声表面波响应检测方法。分析了声表面波谐振器（SAWR）的响应能量熵与带宽的关系。改进了自相关法，抑制了模糊白色噪声，突出了无线声表面波响应的衰减特性。声表面波响应检测根据这两个变化和持续时间的能量熵Ascension的采集的RF信号。数值模拟结果表明，即使在信噪比为6dB的情况下，也可以检测到SAW响应。在不同的条件下，建议的SAW响应检测方法进行了评估与几个实验。声表面波响应可以很好地与正弦信号和噪声区分开。对采用该检测方法的声表面波扭矩测量系统的性能进行了测试。获得的重复性误差…
This paper presents an effective surface acoustic wave (SAW) response detection method for the passive wireless SAW torque sensor to improve the measurement accuracy. An analysis was conducted on the relationship between the response energy-entropy and the bandwidth of SAW resonator (SAWR). A self-correlation method was modified to suppress the blurred white noise and highlight the attenuation characteristic of wireless SAW response. The SAW response was detected according to both the variation and the duration of energy-entropy ascension of an acquired RF signal. Numerical simulation results showed that the SAW response can be detected even when the signal-to-noise ratio (SNR) is 6dB. The proposed SAW response detection method was evaluated with several experiments at different conditions. The SAW response can be well distinguished from the sinusoidal signal and the noise. The performance of the SAW torque measurement system incorporating the detection method was tested. The obtained repeatability error ...