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Ultrasonic liquid level measuring method and ultrasonic liquid level measuring device

A liquid level measurement, ultrasonic technology, applied in the direction of measuring device, liquid/fluid solid measurement, lubrication indicating device, etc., can solve the problems of increased manufacturing cost and difficult construction, etc., to achieve increased manufacturing cost, convenient and simple realization Effect

Active Publication Date: 2018-01-12
TAIHUA WISDOM IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides an ultrasonic liquid level measurement method and an ultrasonic liquid level measurement device, which solves the technical problems of difficult construction or increased manufacturing cost when correcting measurement errors in ultrasonic liquid level measurement in the prior art

Method used

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  • Ultrasonic liquid level measuring method and ultrasonic liquid level measuring device
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  • Ultrasonic liquid level measuring method and ultrasonic liquid level measuring device

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1 of the present application is a method of ultrasonic measurement of liquid level, see figure 1 , the method includes:

[0049] Step S101, transmitting a detection signal to the liquid surface, wherein the detection signal is an ultrasonic signal, and the time of transmitting the detection signal is the first time point;

[0050] Step S102, receiving the ultrasonic echo signal reflected by the liquid surface to be tested, and converting the ultrasonic echo signal into an electrical signal to obtain a feedback signal, wherein the feedback signal is an oscillation signal;

[0051] Step S103, comparing the feedback signal with a predetermined signal strength threshold;

[0052] Step S104, obtaining the time when the feedback signal is greater than the predetermined signal strength threshold for the first time, so as to obtain a second time point;

[0053] Step S105, obtaining the duration time during which the feedback signal is greater than the predetermined s...

Embodiment 2

[0058] A method for measuring liquid surface distance with ultrasonic waves, its flow chart can be found in figure 2 , the method includes:

[0059] Step S201, sending a detection signal to the liquid surface;

[0060] Step S202, judging whether to generate a pulse signal;

[0061] Step S203, calculating the ultrasonic propagation time;

[0062] Step S204, calculating the ultrasonic velocity;

[0063] Step S205, judging whether the gain of the receiving circuit is maximum;

[0064] Step S206, increasing the gain of the receiving circuit;

[0065] Step S207, generating an alarm signal;

[0066] Step S208, giving the liquid surface distance measurement result;

[0067] In the above step S201, a detection signal is transmitted to the liquid surface, wherein the detection signal is an ultrasonic wave, and the time of transmitting the detection signal is the first time point, and then go to step S202.

[0068] In the above step S202, starting from the first time point in th...

Embodiment 3

[0097] Embodiment 3 of the present application is a more preferred ultrasonic liquid level measurement method, the flow chart of which can be found in image 3 , the method includes:

[0098] Step S301, measuring the ambient temperature and calculating the ultrasonic velocity, where the ambient temperature value T is measured, then the propagation velocity v of the ultrasonic wave in the air at the current ambient temperature is:

[0099]

[0100] where, where, v 0 Indicates the propagation speed of the ultrasonic signal in the air at 0°C;

[0101] Step S302, determining a predetermined signal strength threshold, wherein the value range of the predetermined signal strength threshold is 50% to 75% of the maximum amplitude corresponding to the minimum range of the ultrasonic liquid level gauge, and the maximum amplitude corresponding to the minimum range of the ultrasonic liquid level gauge is When the amplitude is equal to the liquid level distance of the predetermined liqui...

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Abstract

The invention discloses an ultrasonic liquid level measuring method and an ultrasonic liquid level measuring device. The method comprises the steps that an ultrasonic signal is sent to a to-be-measured liquid level to serve as a detection signal, an ultrasonic echo signal which is reflected back through the to-be-measured liquid level is received, the ultrasonic echo signal is converted to be an electric signal, a feedback signal is obtained, the feedback signal is compared with a preset signal strength threshold value, the time compensation factor delta t is obtained, the measurement propagation time is calculated, the compensation time is calculated by means of the time compensation factor delta t, the measurement propagation time is compensated, and then the precise liquid level distance is obtained through calculation. According to the ultrasonic liquid level measuring method and the ultrasonic liquid level measuring device based on the method, on the condition that the manufacturing cost is not increased, by using the simple and easy-to-implement device, the stability and accuracy of ultrasonic liquid level measurement are improved.

Description

technical field [0001] The invention relates to the technical field of ultrasonic distance measurement, in particular to an ultrasonic liquid level measurement method and an ultrasonic liquid level measurement device. Background technique [0002] At present, in the application of liquid level measurement, because of the advantages of non-contact measurement, easy maintenance, and long service life, ultrasonic liquid level gauges have been more and more widely used. Ultrasonic liquid level gauges usually use the time difference method, that is, by measuring the time difference from sending to receiving the ultrasonic wave, multiplying it by the propagation speed of the ultrasonic wave to obtain the distance of the liquid surface, so as to calculate the measured liquid level value; however, affected by the hardware and software conditions, the ultrasonic wave There are often certain errors in the measurement of propagation time, which makes the accuracy and stability of ultra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/296
Inventor 赵吉祥侯绪彬李亮报徐成龙王淑平马述杰郝敬全
Owner TAIHUA WISDOM IND GRP CO LTD
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