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A Liquid Level Measurement Technique Outside a Sealed Metal Container Based on Ultrasonic Impedance and Echo Energy

机译：基于超声阻抗和回声能量的密封金属容器外部液位测量技术

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摘要

The proposed method for measuring the liquid level focuses on the ultrasonic impedance and echo energy inside a metal wall, to which the sensor is attached directly, not on ultrasonic waves that penetrate the gas–liquid medium of a container. Firstly, by analyzing the sound field distribution characteristics of the sensor in a metal wall, this paper proposes the concept of an "energy circle" and discusses how to calculate echo energy under three different states in detail. Meanwhile, an ultrasonic transmitting and receiving circuit is designed to convert the echo energy inside the energy circle into its equivalent electric power. Secondly, in order to find the two critical states of the energy circle in the process of liquid level detection, a program is designed to help with calculating two critical positions automatically. Finally, the proposed method is evaluated through a series of experiments, and the experimental results indicate that the proposed method is effective and accurate in calibration of the liquid level outside a sealed metal container.
机译：提议的测量液位的方法着重于传感器直接连接到的金属壁内部的超声阻抗和回波能量，而不是穿透容器的气液介质的超声波。首先，通过分析传感器在金属墙中的声场分布特性，提出了“能量圆”的概念，并详细讨论了在三种不同状态下如何计算回声能量。同时，设计了超声波发射和接收电路，将能级内的回波能量转换为等效功率。其次，为了在液位检测过程中找到能级的两个临界状态，设计了一个程序来自动计算两个临界位置。最后，通过一系列实验对所提出的方法进行了评估，实验结果表明，所提出的方法在密封金属容器外部的液位校准中是有效且准确的。

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