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

A mode conversion and surface wave technology, applied in measuring devices, liquid level indicators, engine lubrication, etc., can solve problems such as affecting economic benefits, unfavorable production applications, errors, etc., and achieve the effect of high measurement accuracy

Pending Publication Date: 2021-09-03
CHANGZHOU INST OF TECH
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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

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

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Such as figure 1 As shown, it is a schematic flow chart of an embodiment of using surface wave mode conversion to detect liquid level position provided by the present invention. A method for detecting liquid level position based on surface wave mode conversion includes the following steps:

[0027] 1) Establish the waveguide rod model: the cuboid waveguide rod is vertically inserted into the bottom of the liquid, and the ultrasonic vibration is used to excite the surface wave on the surface of the waveguide rod; part of the waveguide rod is immersed in the liquid, and the acoustic wave excitation position is placed in the air.

[0028] 2) Receive the arriving surface acoustic wave on the air waveguide rod;

[0029] 3) According to the arrival time of the surface acoustic wave obtained in step 2), the propagation velocity of the surfac...

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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...

Claims

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Application Information

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IPC IPC(8): G01F23/296
CPCG01F23/2962
Inventor 贾静檀洋阳郑丹丹吉娇周康
Owner CHANGZHOU INST OF TECH
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