A non-contact liquid level detection method and system

By simultaneously measuring distance using millimeter-wave radar and ultrasonic sensors and combining it with signal processing, the problems of easy contamination and insufficient accuracy in existing liquid level detection technologies have been solved, achieving efficient and non-destructive liquid level measurement.

CN122130183APending Publication Date: 2026-06-02E SURFING IOT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
E SURFING IOT CO LTD
Filing Date
2026-03-30
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In existing technologies, non-contact liquid level detection methods such as laser ranging are prone to contaminating the liquid and are affected by liquid transparency, color differences and liquid surface fluctuations, making it difficult to achieve high-precision measurement in complex environments.

Method used

The system uses millimeter-wave radar and ultrasonic sensors for simultaneous ranging. Through signal processing and calculation, the liquid level result is determined by combining the deviation between the two liquid level values, invalid data is eliminated, and contamination is prevented.

Benefits of technology

It enables rapid and efficient liquid level measurement in complex engineering environments, eliminates invalid data, prevents contamination, and improves measurement accuracy and reliability.

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Abstract

This invention relates to a non-contact liquid level detection method and system, belonging to the field of industrial detection technology. The method includes: receiving a ranging command; simultaneously triggering a millimeter-wave radar sensor and an ultrasonic sensor to measure the liquid level in the same container, obtaining raw echo signals respectively; performing signal processing and liquid level calculation on the raw echo signal from the millimeter-wave radar sensor to obtain a first liquid level value from the millimeter-wave radar sensor, and performing signal processing and liquid level calculation on the raw echo signal from the ultrasonic sensor to obtain a second liquid level value from the ultrasonic sensor; and determining the liquid level in the container based on the first and second liquid level values. This method achieves rapid and efficient removal of invalid data, preventing contamination from flowing into subsequent data systems, and solves the problem that a single sensor cannot identify invalid data in complex engineering environments in the liquid industry.
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