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Method for measuring liquid level by using radar and radar level gauge using same

A radar liquid level meter and radar technology, which is applied in the field of radar liquid level meter, can solve the problems of high cost and poor measurement result accuracy, and achieve the effects of simple equipment, elimination of influence and simple structure

Inactive Publication Date: 2007-05-30
戴奉周 +1
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  • Application Information

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Problems solved by technology

[0003] The present invention provides a method for measuring liquid level with radar and a radar liquid level meter using the method, so as to overcome the problems of poor measurement accuracy and high cost in the prior art

Method used

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  • Method for measuring liquid level by using radar and radar level gauge using same
  • Method for measuring liquid level by using radar and radar level gauge using same
  • Method for measuring liquid level by using radar and radar level gauge using same

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Embodiment Construction

[0022] The present invention will be described in detail below with reference to the drawings and embodiments.

[0023] A method of measuring liquid level with radar:

[0024] Referring to Figure 1, a certain liquid is stored in a liquid storage tank, and the antenna of the radar liquid level gauge is installed on the top of the liquid storage tank. The height of the liquid storage tank is H, and the height of the liquid level is L. The time required for the electromagnetic wave emitted by the radar to propagate to the measured liquid surface and return is t1, and the propagation speed of the electromagnetic wave above the liquid surface in the liquid storage tank is c1, then the following calculation formula can be obtained:

[0025] L=H-c 1 t 1 / twenty one)

[0026] Since the height H of the liquid storage tank is known, only t is required 1 The height L of the measured liquid level can be obtained. But in fact, in many cases, the echo received by the rad...

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Abstract

The invention relates to the field of liquid level measurement device, specifically a method of liquid level measurement with radar and radar liquid level instrument with this method. To solve the current problems of low accuracy of measurement result and high cost, the invention employs the technical project: a method of liquid level measurement with radar, the liquid level to be measured can be obtained based on the formula L=H-c1(Deltphi11 / 4 piDeltf1); a radar liquid level instrument with this method includes radio-frequency unit, transmitting element, receiving element and processing unit, radio-frequency unit includes reference clock source and clock source, reference clock source is connected with the clock source in radio-frequency unit; said transmitting element comprises digit up converter, D / A converter and low-pass filter, said receiving element includes low-pass filter and digit down converter and D / A converter.

Description

Technical field: [0001] The invention relates to the technical field of liquid level measuring equipment, in particular to a method for measuring liquid level by radar and a radar liquid level instrument using the method. Background technique: [0002] Radar level gauge is one of many liquid level measurement methods. It has the advantages of no moving parts, no contact with the measured substance, and high measurement accuracy. At present, the existing radar level gauges are classified into two types: linear frequency modulation continuous wave radar level gauges and pulse radar level gauges. Whether the existing radar level gauges are linear frequency modulation continuous wave radar level gauges or pulse radar level gauges, they all achieve high-precision measurement by transmitting large-bandwidth signals. However, there is a problem with this method. In fact, in many cases, the echoes received by the radar are mixed with strong reflection echoes from the bottom of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/296G01F23/284G01S15/08G01S13/08
Inventor 戴奉周郭晓昱
Owner 戴奉周
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