Calibration of Detecting Depth of LCR Wave of Ultrasonic Stress Transducer Based on Slotting Method
YI Chang1,2,3,YAO Lei2,3,ZHENG Huifeng1,NIU Miao1,2,3,WU Delin2,3,GAO Shenping2,3,YU Xingyan2,3
1. College of Metrological Technology and Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. Zhejiang Institute of Quality Sciences, Hangzhou, Zhejiang 310018, China
3. Key Laboratory of Acoustics andVibration Applied Measuring Technology, State Administration for Market Regulation, Hangzhou, Zhejiang 310018, China
Abstract：In order to accurately characterize the detection depth (LCR wave penetration depth) of ultrasonic stress transducers at different frequencies and improve the spatial resolution of stress measurement, a study on LCR wave detection depth calibration of ultrasonic stress transducers based on slotting method is carried out. The slotting calibration method is based on the principle that when the slotting depth exceeds the penetration depth of LCR waves, the propagation of waves will be affected by the slotting. Firstly, a finite element research model for the penetration depth of LCR waves is established by using a physical field of elastic waves with time domain. The generation and propagation process of LCR waves are simulated, and the influence of groove shapes on LCR waves and detection depth are analyzed. By analyzing the two characteristic parameters of sound time difference and amplitude change, it is concluded that rectangular slot is more suitable for the detection depth calibration. Based on this, detection depth calibration experiments are conducted of transducers at frequencies of 2.5, 5, and 7.5MHz. The uncertainty of the experimental results at 2.5MHz is evaluated. The results show that the average value of ten measurements of LCR wave detection depth for a 2.5MHz transducer is 2.85mm, with an error of 0.15mm from the nominal value, and the combined standard uncertainty is 0.29mm. The research results are meaningful for calibrating the detection depth of transducers at different frequencies and improving the spatial resolution of stress measurement, and can provide experimental reference for the empirical formula of LCR wave penetration depth.
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2024, Vol. 45 
