CN103674170B - A kind of guide wave radar liquid level gauge - Google Patents
A kind of guide wave radar liquid level gauge Download PDFInfo
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- CN103674170B CN103674170B CN201310692985.4A CN201310692985A CN103674170B CN 103674170 B CN103674170 B CN 103674170B CN 201310692985 A CN201310692985 A CN 201310692985A CN 103674170 B CN103674170 B CN 103674170B
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- level gauge
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Abstract
The present disclosure provides a kind of guide wave radar liquid level gauge.The liquid level gauge includes：Signal transmitter unit, signal amplification unit, signal receiving unit and processor.Wherein, signal amplification unit is used for the echo-signal of reception signal receiving unit output, and the echo-signal is amplified accordingly according to the amplitude of the echo-signal.That is, the multiple that the signal amplification unit is amplified to the echo-signal of different amplitudes is different.So, the echo-signal after signal amplification unit amplifies is more beneficial for the identification of processor, so as to improve the detection range of guide wave radar liquid level gauge.
Description
Technical field
The present invention relates to level gauging field, more particularly to a kind of guide wave radar liquid level gauge.
Background technology
With the development of oil and chemical engineering industry, liquid level gauge has obtained more and more extensive answer in field of industrial automatic control
With.The liquid level gauge that currently there are generally based on radar level gauge, such as：Guide wave radar liquid level gauge.
Guide wave radar liquid level gauge is measured using Time Domain Reflectometry principle and time domain Extended Technology.Its operation principle is：
Propagated by guided wave bar of the pulse signal of instrument output along guide wave radar liquid level gauge.When the pulse signal travel to guided wave bar and
During the contact position of liquid level, because the characteristic impedance of pulse signal changes, echo-signal will be produced at liquid level.Enter
And instrument launches the time difference of pulse signal and echo-signal by calculating, so as to obtain the liquid level of measured medium.
Because the dielectric constant of measured medium is different, the amplitude of the echo-signal of reflection is also different.Specifically, dielectric constant
The amplitude for the echo-signal that big measured medium reflects is larger, the echo letter that the small measured medium of dielectric constant reflects
Number amplitude it is smaller.Because the instrument echo-signal small to amplitude is difficult identification, thus reduce the detection range of instrument.
The content of the invention
In view of this, the present invention provides a kind of guide wave radar liquid level gauge, to improve the detection range of instrument.
To achieve the above object, the present invention provides following technical scheme：
A kind of guide wave radar liquid level gauge, including：Signal transmitter unit, signal receiving unit and calculating measured medium liquid level
Processor, in addition to：
Signal amplification unit is used for the amplitude size of the echo-signal exported according to the signal receiving unit, to described time
Ripple signal is amplified accordingly, and the echo-signal after amplification is sent to the processor；
The signal amplification unit includes：
Multichannel amplifying circuit, single-chip microcomputer, selecting switch and the memory being amplified to the echo-signal；
Wherein, the single-chip microcomputer is used to control the selecting switch to select the electricity of amplification all the way in the multichannel amplifying circuit
Road is once amplified to the echo-signal, and then according to the amplitude of the echo-signal after once amplification, passes through control
The selecting switch reselects corresponding amplifying circuit and the echo-signal is amplified accordingly；
The residing memory that is connected with the single-chip microcomputer is used for the amplitude and multiplication factor for being stored with the echo-signal
Corresponding relation.
Preferably, the liquid level gauge also includes：Record the signal transmission time of the signal transmitter unit and the signal
The time detecting unit of the signal reception time of receiving unit.
Preferably, the liquid level gauge also includes：It is connected between the signal amplification unit and the signal receiving unit,
The signal filter unit of processor is filtered to the echo-signal of signal output unit output.
Preferably, institute's liquid level gauge also includes：Propagate the guided wave bar of transmission signal and echo-signal.
Preferably, the liquid level gauge also includes：It is connected with the processor, shows the display of the liquid level of measured medium.
Preferably, the signal of the signal transmitting unit transmitting is high-frequency pulse signal.
Preferably, the liquid level gauge also includes：Connect the power interface of external power source.
Understand that compared with prior art, the present disclosure provides a kind of guided wave radar liquid via above-mentioned technical scheme
Position meter.The liquid level gauge includes：Signal transmitter unit, signal amplification unit, signal receiving unit and processor.Wherein, signal is put
Big unit is used for the echo-signal of reception signal receiving unit output, and the echo-signal is entered according to the amplitude of the echo-signal
The corresponding amplification of row.That is, the multiple that the signal amplification unit is amplified to the echo-signal of different amplitudes is different.This
Sample, the echo-signal after signal amplification unit amplifies are more beneficial for the identification of processor, so as to improve guided wave radar liquid
The detection range of position meter.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 shows a kind of structural representation of one embodiment of guide wave radar liquid level gauge of the present invention
Fig. 2 shows a kind of structural representation of one embodiment of the signal amplification unit of guide wave radar liquid level gauge of the present invention
Figure；
Fig. 3 shows a kind of structural representation of another embodiment of guide wave radar liquid level gauge of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The operation principle of guide wave radar liquid level gauge is：By the transmitting pulse of signal transmitter unit output along guided wave radar liquid level
The guided wave bar of meter is propagated downwards.When running into measured medium, echo impulse is produced in the intersection of guided wave bar and measured medium.Its
In, the power of the echo impulse is relevant with the dielectric constant of measured medium, and the dielectric constant of measured medium is bigger, to launching pulse
Degree of reflection it is higher, echo-signal it is stronger.On the contrary, when the dielectric constant of measured medium is smaller, measured medium is to transmitting
The degree of reflection of pulse is lower, and echo-signal is weaker.So, less tested Jie of dielectric constant is detected in guide wave radar liquid level gauge
During the liquid level of matter, because echo-signal is very weak, thus guided wave radar is difficult identification echo-signal, causes accuracy of detection relatively low.
Therefore, show a kind of structural representation of one embodiment of guide wave radar liquid level gauge of the present invention referring to Fig. 1.
In the present embodiment, the guide wave radar liquid level gauge includes：Signal transmitter unit 1, signal amplification unit 2, signal connect
Receive unit 3 and processor 4.
Wherein, signal transmitter unit 1 is used to export transmitting pulse to measured medium.The transmitting pulse is in measured medium
Reflected at liquid level, form echo-signal.
Signal receiving unit 3 receives the echo-signal, and the meeting ripple signal is sent into signal amplification unit 2.Signal
Amplifying unit 2 detects the amplitude of the echo-signal, and according to the amplitude of the echo-signal, the echo-signal is put accordingly
Greatly.That is, the multiple that signal amplification unit 2 is amplified for the echo-signal of different amplitudes is different, so that different
Echo-signal can be identified by processor 3.It is understood that echo-signal width is stored with signal amplification unit 2
The corresponding relation of value and multiplication factor.
And then time and signal receiving unit 3 reception signal of the processor 4 according to the transmission signal of signal transmitter unit 1
Time, calculate the liquid level of measured medium.It should be noted that processor 4 calculates the liquid level of measured medium according to the time difference
Process is prior art, and the present invention does not make detailed explanation.
From above-described embodiment：Guide wave radar liquid level gauge provided by the present invention is directed to the width of different echo-signals
Value, is amplified, so that different echo-signals is capable of the processing of guided wave radar level gauge accordingly to echo-signal
Device 4 is identified.Such as：When guide wave radar liquid level gauge measures to the less measured medium of dielectric constant, echo-signal compared with
It is weak, it is in particular in that the amplitude of the echo information is smaller, the signal amplification unit of guide wave radar liquid level gauge enters to the echo-signal
The larger amplification of row, so that the echo-signal can be identified, improves the detection range of guide wave radar liquid level gauge.
A kind of structure of one embodiment of the signal amplification unit of guide wave radar liquid level gauge of the present invention is shown referring to Fig. 2
Schematic diagram.In the present embodiment, the signal amplification unit 2 includes：Single-chip microcomputer 21, selecting switch 22 and multichannel amplifying circuit
23。
Wherein, single-chip microcomputer 21 is used to control the selecting switch 22 to select the amplification all the way in the multichannel amplifying circuit 23
Circuit 23 is once amplified to the echo-signal, and then according to the amplitude of the echo-signal after once amplification, is passed through
The single-chip microcomputer 21 controls the selecting switch 22 to reselect corresponding amplifying circuit 23 and the echo-signal is carried out accordingly
Amplification.
Need to illustrate when, in the present embodiment, the signal amplification unit 2 also includes：It is previously stored with echo-signal
The memory 24 of the corresponding relation of amplitude and multiplication factor.
When single-chip microcomputer 21 obtains the amplitude size of the echo-signal, the echo-signal prestored in memory 24 is called
Amplitude and multiplication factor corresponding relation, so that it is determined that the echo-signal needs the multiple that amplifies, and then pass through selecting switch
22 select the amplifying circuit 23 of corresponding multiple to be amplified the echo-signal.
Optionally, in the single-chip microcomputer 21 can a built-in comparator, the comparator is by comparing the amplitude of echo-signal
Corresponding electric signal and preset reference electric signal, control corresponding amplifying circuit 23 to turn on.
It should be noted that in actual applications, the signal that guide wave radar liquid level gauge is sent is frequently subjected to external signal
Interference, so as to have impact on the measurement accuracy of guide wave radar liquid level gauge.Therefore, show a kind of guided wave radar of the present invention referring to Fig. 3
The structural representation of another embodiment of liquid level gauge.
In the present embodiment, the guide wave radar liquid level gauge includes：Signal transmitter unit 1, signal amplification unit 2, signal filter
Ripple unit 5, signal receiving unit 3 and processor 4.
Wherein, transmitting pulse, the echo reflected by measured medium are exported from signal transmitting unit 1 to measured medium
Signal is after the reception of signal receiving unit 2, in input signal filter unit 5.And then signal filter unit 5 is believed the echo
Number processing is filtered, to remove the interference signal in the echo-signal, and the echo-signal after processing is sent to signal and put
Big unit 2 is amplified.Processor 4 launches the signal according to signal transmitter unit 1 and receives the signal with signal receiving unit 3
Time difference calculate measured medium liquid level.
It should be noted that in the present embodiment, the guide wave radar liquid level gauge also includes：The time being connected with processor 4
Detection unit 6.The time detecting unit 6 can the time of the transmission signal of tracer signal transmitter unit 1 and signal receiving unit 3 in real time
The time of reception signal, to provide the support in data to processor 4 during follow-up.
Optionally, in the present embodiment, the guide wave radar liquid level gauge also includes：Show the display unit of measured medium liquid level
7。
It should be noted that in the application of reality, because the liquid level of measured medium is not constantly in stable shape
State, thus the signal after measured medium reflects is by being presented diffusing reflection state, so as to reduce guide wave radar liquid level gauge
Measurement accuracy.
Finally, it is to be noted that, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or also include for this process, article or equipment institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including institute
State in process, article or the equipment of key element and other identical element also be present.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the application.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments in the case where not departing from spirit herein or scope.Therefore, the application
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (7)
1. a kind of guide wave radar liquid level gauge, including：Signal transmitter unit, signal receiving unit and calculate measured medium liquid level
Processor, it is characterised in that also include：
Signal amplification unit is used for the amplitude size of the echo-signal exported according to the signal receiving unit, and the echo is believed
Number amplified accordingly, and the echo-signal after amplification is sent to the processor；
The signal amplification unit includes：
Multichannel amplifying circuit, single-chip microcomputer, selecting switch and the memory being amplified to the echo-signal；
Wherein, the single-chip microcomputer is used to control the selecting switch to select the amplifying circuit pair all the way in the multichannel amplifying circuit
The echo-signal is once amplified, and then according to the amplitude of the echo-signal after once amplification, by described in control
Selecting switch reselects corresponding amplifying circuit and the echo-signal is amplified accordingly；
With the single-chip microcomputer be connected the memory be used for be stored with the echo-signal amplitude and multiplication factor it is corresponding
Relation.
2. liquid level gauge according to claim 1, it is characterised in that the liquid level gauge also includes：Record the signal transmitting
The time detecting unit of the signal reception time of the signal transmission time of unit and the signal receiving unit.
3. liquid level gauge according to claim 2, it is characterised in that the liquid level gauge also includes：The signal is connected to put
Between big unit and the signal receiving unit, processing is filtered to the echo-signal of signal output unit output
Signal filter unit.
4. liquid level gauge according to claim 2, it is characterised in that institute's liquid level gauge also includes：Propagate transmission signal and echo
The guided wave bar of signal.
5. liquid level gauge according to claim 2, it is characterised in that the liquid level gauge also includes：It is connected with the processor,
Show the display of the liquid level of measured medium.
6. liquid level gauge according to claim 1, it is characterised in that the signal of the signal transmitting unit transmitting is high frequency arteries and veins
Rush signal.
7. liquid level gauge according to claim 1, it is characterised in that the liquid level gauge also includes：Connect the electricity of external power source
Source interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310692985.4A CN103674170B (en) | 2013-12-17 | 2013-12-17 | A kind of guide wave radar liquid level gauge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310692985.4A CN103674170B (en) | 2013-12-17 | 2013-12-17 | A kind of guide wave radar liquid level gauge |
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| CN103674170A CN103674170A (en) | 2014-03-26 |
| CN103674170B true CN103674170B (en) | 2018-03-27 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568058A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Guide wave radar level meter |
| CN108225482A (en) * | 2016-12-15 | 2018-06-29 | 重庆川仪自动化股份有限公司 | Suitable for the gain-adaptive adjusting method and system of guided wave radar |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243243A (en) * | 1999-06-18 | 2000-02-02 | 中国科学院上海技术物理研究所 | Linear frequency-modulation continuous wave radar feed location instrument and measuring method thereof |
| CN101666668A (en) * | 2008-09-04 | 2010-03-10 | Vega格里沙贝两合公司 | Variable transmission output for fill state measurement |
| CN103175587A (en) * | 2013-03-01 | 2013-06-26 | 电子科技大学 | Guided wave radar liquid indicator |
| CN203732130U (en) * | 2013-12-17 | 2014-07-23 | 重庆川仪自动化股份有限公司 | Guide wave radar liquid meter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006034554A1 (en) * | 2006-07-26 | 2008-01-31 | Vega Grieshaber Kg | Microwave module for filling level measuring device, has echo signaling-unit for providing echo signal, reference pulse-generation unit generating reference pulse, where reference pulse and echo signal are separated from each other |
-
2013
- 2013-12-17 CN CN201310692985.4A patent/CN103674170B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243243A (en) * | 1999-06-18 | 2000-02-02 | 中国科学院上海技术物理研究所 | Linear frequency-modulation continuous wave radar feed location instrument and measuring method thereof |
| CN101666668A (en) * | 2008-09-04 | 2010-03-10 | Vega格里沙贝两合公司 | Variable transmission output for fill state measurement |
| CN103175587A (en) * | 2013-03-01 | 2013-06-26 | 电子科技大学 | Guided wave radar liquid indicator |
| CN203732130U (en) * | 2013-12-17 | 2014-07-23 | 重庆川仪自动化股份有限公司 | Guide wave radar liquid meter |
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