Device for ultrasonic measuring liquid level and method thereof

Abstract

The invention discloses a device and method of measuring liquid using ultrasonic. The device includes: a signal generator; a data collecting device; a data process device; it is characterized in that it also includes an ultrasonic sending probe and at least two ultrasonic receiving probes which are fixed to a probe fixation device. The method includes following steps: 1)an ultrasonic sending probe sends ultrasonic to surface of liquid; 2)at least two ultrasonic receiving probes receive ultrasonic reflected from surface of liquid detected; 3)time of ultrasonic from sending to receiving is recorded; 4)radial distance and lognitudinal distance between said ultrasonic receiving probes and said ultrasonic sending probe are ensured; 5)altitude of liquid can be obtained by said time of ultrasonic and said radial distance and lognitudinal distance. The invention does not need to consider speed of sound, and precision of measuring liquid is increased.

Description

technical field [0001] The invention relates to a liquid level gauge, in particular to an ultrasonic liquid level measuring device and method, which can accurately measure the height of various liquids. Background technique [0002] Ultrasonic technology has irreplaceable advantages of other types of instruments in measuring liquid level, such as convenient installation and commissioning, simple maintenance and repair, high precision, and good performance. Therefore, it has been widely used in liquid level measurement in industrial enterprises. [0003] Existing ultrasonic liquid level measurement technology often needs to consider the sound velocity of ultrasonic waves, such as the technology disclosed in Document 1: "Principles and Applications of Ultrasonic Liquid Level Meters, Zhang Xiaoyan, Heilongjiang Paper, No. 3, 2004", as shown in Fig. As shown in 1, this technology installs an ultrasonic probe with a combined transmitter and receiver directly above the liquid to ...

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Problems solved by technology

[0007] However, in the actual use environment, the temperature and pressure of the medium may change, resulting in the value of the sound velocity is not necessarily a constant value of 340m / s, and the above method assumes that the sound velocity is a constant value, which is not true in the actual use environment Changes in the situation will obviously cause a large measurement error

In addition, the above-mentioned conventional threshold value judgment method for determining time in the prior art itself has a large error

[0008] Another existing technology for measuring liquid level, such as the technology disclosed in Document 2: "Application of Ultrasound in Measurement, Yin Xuquan, Zhang Jianhua, Gao Shouwei, Wang Zhongmin, Modern Electronic Technology, Issue 5, 2003, Issue 148" , as shown in Figure 2, this document expounds the basic principle of ultrasonic distance measurement. The difference from the technology in Document 1 is that two probes are placed above the liquid to be measured, one for transmitting and one for receiving, but the measurement The method is the same as that in Document 1, and it is also assumed that the sound velocity is a constant value. Obviously, this technique will also lead to inaccurate measurements

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