Novel method for measuring liquid level by combining laser interference technology and free-state floater

Abstract

The invention provides a novel method for measuring a liquid level in a container in a high precision manner. In the method, the liquid level is measured by utilizing the high precision characteristic of a laser interference technology on length measurement and combining a free-state floater reflection device floating on a liquid surface. By means of an experiment device based on the method disclosed by the invention for measuring different uniformly dispersed liquid levels in a full scaling range of a container, simultaneously correcting the influences of a laser interferometer by aiming at each influence factor and comparing indicating values of a liquid indicator, a result that the accuracy of the method disclosed by the invention can reach 0.1mm is obtained. By means of the method disclosed by the invention, not only can a liquid level value inside the container be measured in real time, but also the liquidometers of various types at present can be evaluated accurately based on the high precision characteristic of the method disclosed by the invention, thus, not only can mass users be facilitated on selecting types of the liquidometers and calibrating the liquidometers in fixed time, but also various liquidometer manufacturers can be promoted to increase self technological level, so that a firm theoretical foundation is set for popularizing the high-precision liquidometers in an oil product handing-over process.

Description

Technical field [0001] The invention relates to a new method for high-precision measurement of the liquid level of a medium in a container. By this method, the change of the liquid level of the medium in the container can be measured in real time and digitally displayed through a terminal device. Compared with other liquid level measurement methods, this method can measure the liquid level up to 0.1mm, which is especially suitable for the accuracy detection of liquid level gauges used in oil storage tanks in the petrochemical industry. Background technique [0002] With the continuous development and progress of industrial automatic control systems, the need to measure and monitor the liquid level or interface of containers (tanks, kettles, towers, etc.) in real time has become more and more urgent. At present, there are many methods for measuring the liquid level of a container, and the measuring principles are also different. Generally speaking, according to whether the parts ...

AI Technical Summary

Problems solved by technology

But so far, apart from the accuracy data provided by the manufacturer, there is no general solution that can give the accuracy indicators of various liquid level gauges, and this has also caused the liquid level gauge application industry to choose the level gauge brand and models without a quantitative reference standard

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