Method for detecting liquid level position based on surface wave mode conversion

Abstract

The invention discloses a method for detecting a liquid level position based on surface wave mode conversion, and the method comprises the following steps: vertically inserting a cuboid waveguide rod into the bottom of liquid, and exciting a surface wave model on the surface of the waveguide rod by utilizing ultrasonic vibration; enabling the air waveguide rod and the immersion waveguide rod to receive the arrived sound waves; on the surface of the waveguide rod, acquiring the point displacement along the sound wave propagation path, and obtaining the surface acoustic wave speed in the air waveguide rod and the stoneley wave propagation speed in the immersion waveguide rod respectively; and determining the liquid level position according to the time when the stoneley wave reaches the bottom of the waveguide rod and the surface wave speed, the stoneley wave speed and the sound wave excitation position. The invention provides a reliable method for measuring the position of the liquid level, and provides a guidance basis for realizing online detection of the position of the liquid level.

Description

technical field [0001] The invention relates to the technical field of ultrasonic detection, in particular to a method for detecting liquid level position based on surface wave mode conversion. Background technique [0002] The most traditional liquid level measurement method is the float method. This method is mainly based on the principle that the float will lower as the liquid level becomes lower. The specific measurement method is that when the liquid level increases or decreases, the float will change as the liquid level changes. As the float changes, the resistance element driven by the float will also change. And when there is very little liquid, the liquid level will become very low, so the float will also decrease with the liquid level, which will drive the resistance on the float, and the resistance value will become very large at this time. When the circuit becomes large, the current will become small, and the pointer will point to the side where the liquid lev...

AI Technical Summary

Problems solved by technology

Furthermore, when the waveguide through which the surface wave propagates is immersed in a liquid, the velocity of the surface wave decreases

[0004] However, there is no research on measuring the liquid surface position using surface wave mode conversion.

In the industry, liquid level position measurement often produces errors due to human factors, instrument factors, environmental factors, etc., which will bring disadvantages to production and application, and will affect economic benefits to a certain extent

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