Lou Litai, Yang Jianhua, Ma Kaixuan, Gong Tao, Wang Zhongqiu, Li Baofeng
Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment, School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
School of Computer Science and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
Rev Sci Instrum. 2024 Sep 1;95(9). doi: 10.1063/5.0217499.
Ultra-low-frequency vibration is prevalent in many critical research fields. Nevertheless, for ultra-low-frequency vibration signals below 1 Hz, there is currently a lack of a cost-effective and efficient measurement method. A new ultra-low-frequency vibration signal testing method based on the passive radio frequency tag phase is proposed using the Radio Frequency Identification (RFID) sensing method. By employing vibration detection on ultra-low-frequency vibration signals, the effectiveness of the proposed approach across different frequencies is validated while thoroughly considering factors such as measurement range, precision, distance, and occlusion effects. The results indicate that this method can accurately measure ultra-low frequency vibration signals as low as 0.01 Hz, with an average relative error of only less than 1.5% for all measurement results, and the error decreases with increasing detection frequency. For the measurement of a 1 Hz vibration signal, the average relative error is less than 1%. In addition, the measurement accuracy remains unaffected by distance or occlusion. Sensitivity and stability tests are also conducted. Continuous monitoring for 8 hours demonstrates the excellent measurement stability of the proposed method. Finally, a performance comparison has been made with laser displacement sensors commonly used in non-contact ultra-low-frequency measurement methods. The results show that the RFID sensing method can detect lower vibration frequencies and has a larger amplitude measurement range and better environmental adaptability. Overall, for ultra-low-frequency vibration, this method offers advantages such as high precision, passive non-contact operation, non-line-of-sight path monitoring, affordability, and convenience. These attributes render it suitable for extensive application in various engineering scenarios requiring ultra-low-frequency vibration testing.
超低频振动在许多关键研究领域中普遍存在。然而，对于低于1Hz的超低频振动信号，目前缺乏一种经济高效的测量方法。利用射频识别（RFID）传感方法，提出了一种基于无源射频标签相位的超低频振动信号测试新方法。通过对超低频振动信号进行振动检测，在充分考虑测量范围、精度、距离和遮挡效应等因素的情况下，验证了该方法在不同频率下的有效性。结果表明，该方法能够准确测量低至0.01Hz的超低频振动信号，所有测量结果的平均相对误差仅小于1.5%，且误差随检测频率的增加而减小。对于1Hz振动信号的测量，平均相对误差小于1%。此外，测量精度不受距离或遮挡的影响。还进行了灵敏度和稳定性测试。连续监测8小时证明了该方法具有出色的测量稳定性。最后，与非接触式超低频测量方法中常用的激光位移传感器进行了性能比较。结果表明，RFID传感方法能够检测更低的振动频率，具有更大的振幅测量范围和更好的环境适应性。总体而言，对于超低频振动，该方法具有高精度、无源非接触操作、非视线路径监测、价格低廉和方便等优点。这些特性使其适用于各种需要超低频振动测试的工程场景中的广泛应用。
