CN103674171B - The empty recognition methods of a kind of material and device - Google Patents
The empty recognition methods of a kind of material and device Download PDFInfo
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- CN103674171B CN103674171B CN201310702950.4A CN201310702950A CN103674171B CN 103674171 B CN103674171 B CN 103674171B CN 201310702950 A CN201310702950 A CN 201310702950A CN 103674171 B CN103674171 B CN 103674171B
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Abstract
This method is processed the implementation that has added coda wave identification in the echo software algorithm of level gauging, search by the characteristic quantity to coda wave, find coda wave position accurately, whether be material empty, avoid the maloperation of industrial automatic control if accurately identifying measured medium according to coda wave position and sensor length difference.
Description
Technical field
The present invention relates to level gauging field, relate in particular the empty recognition methods of a kind of material and device.
Background technology
Along with petroleum and chemical industry industrial expansion, level meter has obtained more and more in field of industrial automatic controlApplication widely. The level meter existing is in the market taking radar levelmeter as main, such as guided wave radarLevel meter and pulse radar material level meter.
Guided wave radar material level gauge adopts Time Domain Reflectometry principle and time domain Extended Technology to measure. Its workPrinciple is: the pulse signal of being exported by transmitter unit is propagated along the guided wave bar of guided wave radar material level gauge, whenWhen this pulse signal propagates into the contact position of guided wave bar and measured medium, produce echo-signal. And then,Receiving element is according to the pulse signal of output and the time difference of echo-signal, thereby obtains the thing of measured mediumPosition.
In guided wave radar material level gauge application at the scene, due to the limitation of its measuring principle, make guided waveRadar in use inevitably produces and measures blind area, comprising: He Xia blind area, upper blind area. Only haveMaterial is between He Xia blind area, upper blind area time, the reliability of level gauging in guarantee tank body. Thereby,In actual applications, guided wave radar material level gauge cannot determine that measured medium in tank body is whether empty in expectingState.
Summary of the invention
In view of this, the invention provides the empty recognition methods of a kind of material and device, whether to detect measured mediumIn expecting empty state.
For achieving the above object, the invention provides following technical scheme:
The empty recognition methods of a kind of material, described method is applied to guided wave radar material level gauge, comprising:
Obtain the echo-signal that measured medium reflects, generate corresponding oscillogram;
According to described oscillogram, judge in described echo-signal and whether exist the coda wave that meets preset requirement to believeNumber;
If not, determine that measured medium is in non-material dummy status;
If so, calculate the position of described coda wave signal, judge the position of described coda wave signalWith the distance of described guided wave radar material level gauge end position whether in preset range;
When the distance of the position of described coda wave signal and the end position of described guided wave radar material level gaugeFrom in preset range time, determine that described measured medium is for material dummy status.
Preferably, described in obtain the echo-signal that measured medium reflects, generate corresponding oscillogram,Comprise:
Obtain the echo-signal that measured medium reflects;
According to predeterminated frequency, described echo-signal is sampled;
Generate the oscillogram of described echo-signal according to sampling result.
Preferably, described according to described oscillogram, judge in described echo-signal, whether exist meet defaultThe coda wave signal requiring comprises:
In described oscillogram, determine the length of described guided wave radar material level gauge;
Obtain the coda wave signal in the length range of described guided wave radar material level gauge;
Judge whether described coda wave signal meets minimum amplitude and be less than default minimum amplitude, and maximum amplitude is littleIn the requirement of default maximum amplitude;
If so, in definite described echo-signal, there is the coda wave signal that meets preset requirement;
If not, determine in described echo-signal and do not have the coda wave signal that meets preset requirement.
Preferably, in the time determining that in described echo-signal, existence meets the coda wave signal of preset requirement, described inThe position of calculating described coda wave signal comprises:
In described oscillogram, obtaining amplitude in described coda wave signal is 2 points of default minimum amplitude;
Position using the intermediate point position of described 2 as described coda wave signal.
Preferably, in the time determining that in described echo-signal, existence meets the coda wave signal of preset requirement, described inThe position of calculating described coda wave signal comprises:
In described oscillogram, obtain the multiple spot of described coda wave signal
According to the mode of multi-point fitting, calculate the minimum point of described coda wave signal;
By the minimum point position of described coda wave signal, as the position of described coda wave signal.
The empty recognition device of a kind of material, described device comprises:
Obtain the signal gathering unit of the echo-signal that measured medium reflects;
According to predeterminated frequency, the echo-signal that described signal gathering unit is collected samples, and rawBecome the sampling unit of respective waveforms figure;
According to described oscillogram, judge in described echo-signal and whether exist the coda wave that meets preset requirement to believeNumber the first judging unit;
When the judged result of described the first judging unit is while being no, determine that described measured medium is non-material skyState;
When the judged result of described the first judging unit is when being, the institute of calculating described coda wave signal is in placePut computing unit;
Judge the distance of position and the described guided wave radar material level gauge end position of described coda wave signalThe second judging unit from whether in preset range;
When the judged result of described the second judging unit is when being, determine that described measured medium is for material dummy status.
Preferably, described device also comprises: the display unit that shows the oscillogram of described echo-signal.
Preferably, described device also comprises: in the time that definite measured medium is material dummy status, and output alarm letterNumber alarm unit.
Preferably, described display unit is liquid crystal display.
Preferably, described alarm unit unit comprises: 4-20mA electric current output module.
Known via above-mentioned technical scheme, compared with prior art, the present invention openly provides a kind of material skyRecognition methods, the method is applied to guided wave radar material level gauge. The method reflects according to measured mediumWhether echo-signal, generates corresponding oscillogram, and according to this oscillogram, judge in echo-signal and existMeet the coda wave signal of preset requirement. If not, determine that measured medium is for material dummy status; If so, enterOne step is calculated the position of this coda wave signal, when position and the described guided wave radar of this coda wave signalThe distance of the end position of level meter in preset range time, determines that described measured medium is for the empty shape of materialState. This method is processed the implementation that has added coda wave identification in the echo software algorithm of level gauging,Search by the characteristic quantity to coda wave, find coda wave position accurately, long according to coda wave position and sensorWhether degree difference is accurately identified measured medium is that material is empty, avoids the maloperation of industrial automatic control.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to realityThe accompanying drawing of executing required use in example or description of the Prior Art is briefly described, apparently, belowAccompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, notPay under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 shows the schematic flow sheet of an embodiment of the empty recognition methods of a kind of material of the present invention;
Fig. 2 shows the structural representation of an embodiment of the empty recognition device of a kind of material of the present invention.
Detailed description of the invention
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 outDescribe clearly and completely, obviously, described embodiment is only the present invention's part embodiment, andNot whole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art are not doingGo out the every other embodiment obtaining under creative work prerequisite, all belong to the scope of protection of the invention.
Show the schematic flow sheet of an embodiment of the empty recognition methods of a kind of material of the present invention referring to Fig. 1.In the present embodiment, the method comprises:
101: obtain the echo-signal that measured medium reflects, and generate corresponding oscillogram.
Its concrete operation method is: echo-signal measured medium being reflected according to default frequency is enteredRow sampling, obtains multiple impact points, the multiple impact points that collect connected in a certain order, fromAnd obtain the oscillogram of this echo-signal. Wherein, the guided wave radar material level gauge that different manufacturers producesSampling frequency to echo-signal difference is set, thereby the precision of the oscillogram forming is also different.
Be understandable that, the precision of faster this oscillogram of sampling frequency is higher, but in actual applicationThe middle storage capacity that need to consider memory, thus this sampling frequency can according to practical matter need to by thisThe professional in field arranges.
102: according to oscillogram, judge in echo-signal, whether there is the coda wave signal that meets preset requirement.
It should be noted that, in actual application, those skilled in the art will be by guided wave radar thingThe echo-signal that position meter end reflection is returned is referred to as coda wave signal. Because electromagnetic wave is in air and at quiltSurvey the spread speed difference in medium, thereby with respect to the echo-signal of going back at measured medium surface reflection, the echo-signal (coda wave signal) of returning by guided wave radar material level gauge end reflection can produce prolongsLate. It is more that guided wave radar material level gauge is immersed in part in measured medium, the carryover effects of this coda wave signalMore obvious. Thereby, when measured medium is in material when dummy status, the end of guided wave radar material level gauge not withThe state of measured medium contact, the carryover effects minimum of coda wave signal. That is to say, when measured medium placeIn the time of material dummy status, the position of coda wave signal approaches the end of guided wave radar material level gauge most.
Concrete, first determine the length of this guided wave radar material level gauge, and in the length of guided wave radar material level gaugeWithin the scope of degree, search minimum amplitude and be less than default minimum amplitude Vmin, and maximum amplitude be less than default the most significantlyThe complete waveform of value Vmax. Wherein, this minimum amplitude Vmin and maximum amplitude Vmax and level meterThe dielectric constant of type, mounting means and measuring media is relevant.
It should be noted that, in actual applications, do not exist and meet above-mentioned requirements when determining in echo-signalEcho-signal time, can directly determine measured medium not in material dummy status.
103: the position of if so, calculating coda wave signal.
Exist in echo-signal while meeting the coda wave signal of above-mentioned requirements when determining, calculate this coda wave signalPosition. Need the value of explanation, in actual application, need to search the characteristic quantity of coda wave signal,Determine coda wave signal accurate location by this characteristic quantity. The present embodiment is by the minimum point place of this coda wave signalPosition is as the position of this coda wave signal.
Concrete, can adopt be averaged or the mode of multi-point fitting is obtained the minimum of this coda wave signal at 2Point. Such as: first find waveform two P1, the P2s crossing with minimum amplitude Vmin, make even with 2All obtain lowest point Px.
104: judge that the position of coda wave signal and the distance of guided wave radar material level gauge end position areNo in preset range.
Need explanation time, difference corresponding different position on guided wave radar material level gauge in oscillogram. WillThe minimum point of the end of guided wave radar material level gauge corresponding location point Py and coda wave signal in oscillogramPx compares, little if position differs scope, think when pre-test be material dummy status, otherwise measure notAt material dummy status. It should be noted that, in actual application, variant because of every span, need rootSet according to situation, do not describe in detail.
It should be noted that, the invention also discloses and the empty identification of one material of expecting that empty recognition methods is suitable for mutuallyDevice. Show the structural representation of an embodiment of the empty recognition device of a kind of material of the present invention referring to Fig. 2.This device comprises: the signal gathering unit 21 of obtaining the echo-signal that measured medium reflects;
According to predeterminated frequency, the echo-signal that signal gathering unit 21 is collected samples, and looksAnswer the sampling unit 22 of oscillogram;
According to oscillogram, judge in echo-signal, whether exist meet preset requirement coda wave signal firstJudging unit 23, wherein, when the judged result of the first judging unit 23 is while being no, determines described testedMedium is non-material dummy status;
When the judged result of the first judging unit 23 is when being, calculate the position of this coda wave signal and calculateUnit 24;
Judge that whether the position of coda wave signal and the distance of guided wave radar material level gauge end position existThe second judging unit 25 in preset range, wherein, when the judged result of described the second judging unit 25 isWhile being, determine that measured medium is material dummy status.
Show the display unit 26 of the oscillogram of described echo-signal, optional, this display unit 26 is liquidCrystal display.
And in the time that definite measured medium is material dummy status, the alarm unit 27 of output alarm signal. DescribedAlarm unit 27 comprises: 4-20mA electric current output module. When measured medium is in the time expecting sky, this electric current is defeatedGo out module and export the alarm current of corresponding size.
Finally, also it should be noted that, in this article, the relational terms such as the first and second gradesOnly be used for an entity or operation and another entity or operating space to separate, and not necessarily requirementOr imply the relation or the order that between these entities or operation, there are any this reality. And, artLanguage " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, therebyThe process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, andAlso comprise other key elements of clearly not listing, or be also included as this process, method, article orThe key element that person's equipment is intrinsic. In the situation that there is no more restrictions, by statement " comprising ... "The key element limiting, and be not precluded within process, method, article or the equipment that comprises described key element and also depositAt other identical element.
In this description, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stressesBe and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field can be realized or useThe application. To be aobvious and easy for those skilled in the art to the multiple amendment of these embodimentSee, General Principle as defined herein can be in the case of not departing from the application's spirit or scope,Realize in other embodiments. Therefore, the application will can not be restricted to these embodiment shown in this article,But to meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. the empty recognition methods of material, described method is applied to guided wave radar material level gauge, it is characterized in that,Comprise:
Obtain the echo-signal that measured medium reflects, generate corresponding oscillogram;
According to described oscillogram, judge in described echo-signal and whether exist the coda wave that meets preset requirement to believeNumber;
If not, determine that measured medium is in non-material dummy status;
If so, calculate the position of described coda wave signal, judge the position of described coda wave signalWith the distance of described guided wave radar material level gauge end position whether in preset range;
When the distance of the position of described coda wave signal and the end position of described guided wave radar material level gaugeFrom in preset range time, determine that described measured medium is for material dummy status;
Wherein, described according to described oscillogram, judge in described echo-signal and whether exist and meet default wantingThe coda wave signal of asking comprises:
In described oscillogram, determine the length of described guided wave radar material level gauge;
Obtain the coda wave signal in the length range of described guided wave radar material level gauge;
Judge whether described coda wave signal meets minimum amplitude and be less than default minimum amplitude, and maximum amplitude is littleIn the requirement of default maximum amplitude;
If so, in definite described echo-signal, there is the coda wave signal that meets preset requirement;
If not, determine in described echo-signal and do not have the coda wave signal that meets preset requirement.
2. method according to claim 1, is characterized in that, described in obtain measured medium and be reflected backThe echo-signal of coming, generates corresponding oscillogram, comprising:
Obtain the echo-signal that measured medium reflects;
According to predeterminated frequency, described echo-signal is sampled;
Generate the oscillogram of described echo-signal according to sampling result.
3. method according to claim 2, is characterized in that, deposits when determining in described echo-signalIn the time meeting the coda wave signal of preset requirement, the position of the described coda wave signal of described calculating comprises:
In described oscillogram, obtaining amplitude in described coda wave signal is 2 points of default minimum amplitude;
Position using the intermediate point position of described 2 as described coda wave signal.
4. method according to claim 2, is characterized in that, deposits when determining in described echo-signalIn the time meeting the coda wave signal of preset requirement, the position of the described coda wave signal of described calculating comprises:
In described oscillogram, obtain the multiple spot of described coda wave signal
According to the mode of multi-point fitting, calculate the minimum point of described coda wave signal;
By the minimum point position of described coda wave signal, as the position of described coda wave signal.
5. the empty recognition device of material, is characterized in that, described device comprises:
Obtain the signal gathering unit of the echo-signal that measured medium reflects;
According to predeterminated frequency, the echo-signal that described signal gathering unit is collected samples, and rawBecome the sampling unit of respective waveforms figure;
According to described oscillogram, judge in described echo-signal and whether exist the coda wave that meets preset requirement to believeNumber the first judging unit;
When the judged result of described the first judging unit is while being no, determine that described measured medium is non-material skyState;
When the judged result of described the first judging unit is when being, the institute of calculating described coda wave signal is in placePut computing unit;
Judge that the position of described coda wave signal and the distance of guided wave radar material level gauge end position areNo the second judging unit in preset range;
When the judged result of described the second judging unit is when being, determine that described measured medium is for material dummy status.
6. device according to claim 5, is characterized in that, described device also comprises: show instituteState the display unit of the oscillogram of echo-signal.
7. device according to claim 5, is characterized in that, described device also comprises: when determiningWhen measured medium is material dummy status, the alarm unit of output alarm signal.
8. device according to claim 6, is characterized in that, described display unit is liquid crystal displayDevice.
9. device according to claim 7, is characterized in that, described alarm unit comprises: 4-20mAElectric current output module.
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| CN201310702950.4A CN103674171B (en) | 2013-12-19 | 2013-12-19 | The empty recognition methods of a kind of material and device |
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| CN201310702950.4A CN103674171B (en) | 2013-12-19 | 2013-12-19 | The empty recognition methods of a kind of material and device |
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| CN104568059B (en) * | 2014-12-31 | 2018-04-20 | 重庆川仪自动化股份有限公司 | Guided wave radar material level gauge slack tank measuring method |
| CN109357729B (en) * | 2018-11-13 | 2020-06-02 | 中国科学院沈阳自动化研究所 | Method for measuring liquid interface level based on guided wave radar liquid level meter |
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| CN203011488U (en) * | 2012-05-23 | 2013-06-19 | 罗斯蒙特储罐雷达股份公司 | Guided wave radar level instrument |
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| US6690320B2 (en) * | 2000-06-13 | 2004-02-10 | Magnetrol International Incorporated | Time domain reflectometry measurement instrument |
| US6588272B2 (en) * | 2001-08-21 | 2003-07-08 | Magnetrol International, Inc. | Redundant level measuring system |
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| CN201138231Y (en) * | 2007-11-05 | 2008-10-22 | 丹东通博电器(集团)有限公司 | Guide wave radar liquid level gauge |
| CN203011488U (en) * | 2012-05-23 | 2013-06-19 | 罗斯蒙特储罐雷达股份公司 | Guided wave radar level instrument |
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