Non-contact liquid level measuring system

Abstract

The invention relates to the technical field of sensors and measurement, in particular to a non-contact liquid level measuring system which comprises a probe arranged on the upper side of a liquid storage tank. The probe outputs collected analog video information to a processing module. The processing module comprises an image collection card, an industrial personal computer or a computer. The image collection card converts the analog video information into digital image information. The industrial personal computer or the computer processes the digital image information to extract a liquid level boundary function to obtain liquid level height according to the function. In the whole liquid level, the liquid level boundary is smallest in change, and the boundary liquid level distribution is simulated through an equation by collecting the liquid level image information. When the position of the probe is fixed, the liquid level height can be obtained directly through the liquid level boundary function. Even if the liquid level has a fall, a result can be measured accurately. The system is wide in application range, capable of conducting real-time measurement and is not affected by factors such as peripheral environment and temperature.

Description

technical field [0001] The invention relates to the technical field of sensors and measurement, in particular to a non-contact liquid level measurement system. Background technique [0002] At present, automatic liquid level measurement of storage tanks is widely used in industry, agriculture, medical and other industries. There are many measurement principles and methods. According to whether it is in contact with liquid, it is divided into two types: contact liquid level measurement and non-contact measurement. The contact type includes float type liquid level gauge, pressure type liquid level gauge, etc. The contact type liquid level gauge is often affected by factors such as the liquid itself and the environment, its accuracy will gradually decrease, and its service life is also short, which makes the maintenance cost relatively high. high. The non-contact type includes ultrasonic wave type and radar wave type. They calculate the liquid level depth by measuring the time...

AI Technical Summary

Problems solved by technology

This solution has the following deficiencies: 1. Unable to complete the measurement of unstable liquid level; 2. It is necessary to set additional measurement benchmarks, colored buoys and other objects in contact with the liquid, which does not achieve a true non-contact measurement; 3. Due to the layout of the image sensor The method is limited, so that the measurement drop is small

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