A non-reference detection method of the external ultrasonic liquid level switch using the PZT

IF 0.6 Q4 ENGINEERING, MECHANICAL Journal of Measurements in Engineering Pub Date : 2023-06-23 DOI:10.21595/jme.2023.23119

Bin Liu, Y. Xiao, Li Wang, Wenjuan Wang, Jian Hu

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Abstract

Oil tank level is an important control parameter in oil depot management. According to the principle that the liquid in the oil tank can absorb the guided wave propagation energy in the tank wall, this paper studied a non-reference detection method of external ultrasonic liquid level switch based on the signal energy change value between the current and the previously liquid level detection signal. The experimental results show that the ultrasonic guided wave with the center frequency of 30 kHz is sensitive and low misjudgment to liquid level detection. According to the experimental setup, the liquid level judgment threshold is set to 0.9890. The influence of the liquid on the guided wave propagation in the tank wall decreases with the frequency of the guided wave increase. Finally, the effectiveness of the proposed method is verified on a diesel oil tank. The research of this paper provides a method for the research of oil tank external liquid level switch technology, and provides an idea for the research of oil tank liquid level measurement based on ultrasonic guided wave.

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一种基于压电陶瓷的外置超声液位开关的非参考检测方法

油库液位是油库管理中的一个重要控制参数。根据油罐内液体能够吸收导波在油罐壁上传播能量的原理，本文研究了一种基于当前与先前液位检测信号之间的信号能量变化值的外超声液位开关非参考检测方法。实验结果表明，中心频率为30 kHz的超声导波对液位检测灵敏度高，误判率低。根据实验设置，液位判断阈值设置为0.9890。液体对导波在槽壁上传播的影响随导波频率的增加而减小。最后，在一个柴油油箱上验证了该方法的有效性。本文的研究为油罐外液位开关技术的研究提供了一种方法，为基于超声导波的油罐液位测量研究提供了思路。

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