Abstract
This study presents a novel method for determining the liquid level from the outside of a sealed container, which is based on the balance of echo energy received by two receiving sensors. The proposed method uses one transmitting transducer and two receiving sensors that are encapsulated in a coupling plane and arranged by certain rules. The calculation and comparison of echo energy are grounded on the difference ultrasonic impedance between gas and liquid media. First, by analyzing the propagation and attenuation characteristics of ultrasonic waves in a solid, an acoustic model for calculating the echo energy is established and simulated in MATLAB. Second, the proposed method is evaluated through a series of experiments. The difference and ratio of echo energy received by two receiving sensors are calculated and compared under two different coupling conditions. Two kinds of the sensors that are arranged by different rules are selected for measuring the liquid level, and the measurement are analyzed and discussed in detail. Finally, the experimental results indicate that the proposed method can meet the proposed accuracy requirements and can effectively solve the problems caused by some poor coupling conditions.
Highlights
In fields such as petroleum, chemical, and aerospace, the real-time monitoring and accurate measurement of the liquid level in a sealed container are important for the industrial automation and safety production [1,2]
The detection results are affected by the rules of sensors arrangement, which is determined by the values of d and d. Another important influence factor is the thickness which is determined by the values of d1 and d2
It can be known that with of the container wall, which is similar to d2
Summary
In fields such as petroleum, chemical, and aerospace, the real-time monitoring and accurate measurement of the liquid level in a sealed container are important for the industrial automation and safety production [1,2]. There are several traditional liquid level measurement methods [1,2,3,4,5,6], of which the technologies are stable and reliable and the measurement results are accurate. Some special industries require a container to be stored with high temperature, high pressure, inflammable, explosive, highly corrosive, or strong, volatile liquid inside. It is easy for a leakage accident to occur, and after a containment failure, maintenance is difficult and costly
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