CN103674171A - Unoccupied material level recognition method and device - Google Patents
Unoccupied material level recognition method and device Download PDFInfo
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- CN103674171A CN103674171A CN201310702950.4A CN201310702950A CN103674171A CN 103674171 A CN103674171 A CN 103674171A CN 201310702950 A CN201310702950 A CN 201310702950A CN 103674171 A CN103674171 A CN 103674171A
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Abstract
Provided are an unoccupied material level recognition method and device. According to the unoccupied material level recognition method, an implementation method of coda wave recognition is added to algorithm processing of echo software of material level measurement, an accurate position of coda waves is found by searching the characteristic quantity of the code waves, whether a measured medium is an unoccupied material level is accurately recognized according to the length difference of the position of the coda waves and a sensor, and false operation under industrial automatic control is avoided.
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 application more and more widely in field of industrial automatic control.The level meter existing in the market be take radar levelmeter as main, such as: guided wave radar material level gauge 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 principle of work is: the pulse signal of being exported by transmitter unit is propagated along the guided wave bar of guided wave radar material level gauge, when this pulse signal propagates into the contact position of guided wave bar and measured medium, produces echoed signal.And then receiving element is according to the pulse signal of output and the mistiming of echoed signal, thereby obtain the thing position of measured medium.
In guided wave radar material level gauge application at the scene, due to the limitation of its measuring principle, make guided wave radar in use inevitably produce and measure blind area, comprising: He Xia blind area, upper blind area.While only having material between He Xia blind area, upper blind area, the reliability of level gauging in guarantee tank body.Thereby in actual applications, guided wave radar material level gauge cannot determine that whether measured medium in tank body is in expecting empty state.
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 medium in expecting empty state.
For achieving the above object, the invention provides following technical scheme:
The empty recognition methods of material, described method is applied to guided wave radar material level gauge, comprising:
Obtain the echoed signal that measured medium reflects, generate corresponding oscillogram;
According to described oscillogram, judge in described echoed signal, whether there is the coda wave signal that meets preset requirement;
If not, determine that measured medium is in non-material dummy status;
If so, calculate the position of described coda wave signal, judge that the position of described coda wave signal and the distance of described guided wave radar material level gauge end position are 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 gauge is in preset range, determine that described measured medium is for material dummy status.
Preferably, described in obtain the echoed signal that measured medium reflects, generate corresponding oscillogram, comprising:
Obtain the echoed signal that measured medium reflects;
According to predeterminated frequency, described echoed signal is sampled;
According to sampling result, generate the oscillogram of described echoed signal.
Preferably, described according to described oscillogram, judge in described echoed signal and whether exist the coda wave signal that meets preset requirement to comprise:
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 less than the requirement of default maximum amplitude;
If so, in definite described echoed signal, there is the coda wave signal that meets preset requirement;
If not, determine in described echoed signal and do not have the coda wave signal that meets preset requirement.
Preferably, in determining described echoed signal, exist while 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.
Preferably, in determining described echoed signal, exist while 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.
The empty recognition device of material, described device comprises:
Obtain the signal gathering unit of the echoed signal that measured medium reflects;
According to predeterminated frequency, the echoed signal that described signal gathering unit is collected samples, and generates the sampling unit of respective waveforms figure;
According to described oscillogram, judge the first judging unit that whether has the coda wave signal that meets preset requirement in described echoed signal;
When described the first judging unit is when the determination result is NO, determine that described measured medium is non-material dummy status;
When judgment result is that of described the first judging unit is, calculate the position computing unit of described coda wave signal;
Judge whether the second judging unit in preset range of the position of described coda wave signal and the distance of described guided wave radar material level gauge end position;
When judgment result is that of described the second judging unit is, determine that described measured medium is for material dummy status.
Preferably, described device also comprises: the display unit that shows the oscillogram of described echoed signal.
Preferably, described device also comprises: when definite measured medium is material dummy status, and the alarm unit of output alarm signal.
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 empty recognition methods, and the method is applied to guided wave radar material level gauge.The echoed signal that the method reflects according to measured medium, generates corresponding oscillogram, and according to this oscillogram, judges in echoed signal, whether there is the coda wave signal that meets preset requirement.If not, determine that measured medium is for material dummy status; If so, further calculate the position of this coda wave signal, when the distance of the position of this coda wave signal and the end position of described guided wave radar material level gauge is in preset range, determine that described measured medium is for material dummy status.This method is processed the implementation that has added coda wave identification in the echo software algorithm of level gauging, by the characteristic quantity to coda wave, search, find coda wave position accurately, whether be material empty, avoid the maloperation of industrial automatic control if according to coda wave position and sensor length difference, accurately identifying measured medium.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying 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.
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 clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, show the schematic flow sheet of an embodiment of the empty recognition methods of a kind of material of the present invention.In the present embodiment, the method comprises:
101: obtain the echoed signal that measured medium reflects, and generate corresponding oscillogram.
Its concrete operation method is: echoed signal measured medium being reflected according to default frequency samples, and obtains a plurality of impact points, a plurality of impact points that collect is connected in a certain order, thereby obtain the oscillogram of this echoed signal.Wherein, the arrange difference of the guided wave radar material level gauge that different manufacturers produces to the sampling frequency of echoed signal, thereby the precision of the oscillogram forming is also different.
Be understandable that, the precision of faster this oscillogram of sampling frequency is higher, yet in actual application, needs to consider the storage capacity of storer, thereby this sampling frequency can need to be arranged by one of skill in the art according to practical matter.
102: according to oscillogram, judge in echoed 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 is referred to as coda wave signal by the echoed signal of returning by guided wave radar material level gauge end reflection.Because electromagnetic wave is different with the velocity of propagation in measured medium in air, thereby with respect to the echoed signal of going back at measured medium surface reflection, the echoed signal of returning by guided wave radar material level gauge end reflection (coda wave signal) can produce and postpone.The part that guided wave radar material level gauge is immersed in measured medium is more, and the carryover effects of this coda wave signal is more obvious.Thereby, when measured medium is when expecting dummy status, the state that end of guided wave radar material level gauge does not contact with measured medium, the carryover effects of coda wave signal is minimum.That is to say, when measured medium is when expecting 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 range of guided wave radar material level gauge, search minimum amplitude and be less than default minimum amplitude Vmin, and maximum amplitude is less than the complete waveform of default maximum amplitude Vmax.Wherein, this minimum amplitude Vmin is relevant with the specific inductive capacity of type, mounting means and the measuring media of level meter with maximum amplitude Vmax.
It should be noted that, in actual applications, while there is not the echoed signal that meets above-mentioned requirements in determining echoed signal, can directly determine that measured medium is not in material dummy status.
103: the position of if so, calculating coda wave signal.
In determining echoed signal, there is while meeting the coda wave signal of above-mentioned requirements the position of calculating this coda wave signal.Need the value of explanation, in actual application, need to search the characteristic quantity of coda wave signal, by this characteristic quantity, determine coda wave signal accurate location.The position of the present embodiment using the minimum point position of this coda wave signal as this coda wave signal.
Concrete, can adopt be averaged or the mode of multi-point fitting is obtained the minimum point of this coda wave signal at 2.Such as: 2 P1, P2 first finding waveform and minimum amplitude Vmin to intersect, be averaged and obtain lowest point Px with 2.
104: judge that the position of coda wave signal and the distance of guided wave radar material level gauge end position are whether in preset range.
Need explanation time, difference corresponding different position on guided wave radar material level gauge in oscillogram.The end of guided wave radar material level gauge corresponding location point Py in oscillogram is compared with the minimum point Px of coda wave signal, little if position differs scope, think when pre-test be material dummy status, otherwise measure at material dummy status.It should be noted that, in actual application, variant because of every span, need according to circumstances set, do not describe in detail.
It should be noted that, the invention also discloses and the empty recognition device of a kind of material of expecting that empty recognition methods is suitable for mutually.Referring to Fig. 2, show the structural representation of an embodiment of the empty recognition device of a kind of material of the present invention.This device comprises: the signal gathering unit 21 of obtaining the echoed signal that measured medium reflects;
According to predeterminated frequency, the echoed signal that signal gathering unit 21 is collected samples, and looks is answered the sampling unit 22 of oscillogram;
According to oscillogram, judge the first judging unit 23 that whether has the coda wave signal that meets preset requirement in echoed signal, wherein, when the first judging unit 23 is when the determination result is NO, determine that described measured medium is non-material dummy status;
When judgment result is that of the first judging unit 23 is, calculate the position computing unit 24 of this coda wave signal;
Judge whether the second judging unit 25 in preset range of the position of coda wave signal and the distance of guided wave radar material level gauge end position, wherein, when judgment result is that of described the second judging unit 25 is, determine that measured medium is material dummy status.
The display unit 26 that shows the oscillogram of described echoed signal, optional, this display unit 26 is liquid crystal display.
And when definite measured medium is material dummy status, the alarm unit 27 of output alarm signal.Described alarm unit 27 comprises: 4-20mA electric current output module.When measured medium is when expecting sky, this electric current output module is exported the alarm current of corresponding size.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the application.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can be in the situation that do not depart from the application's spirit or scope, realization in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the empty recognition methods of material, described method is applied to guided wave radar material level gauge, it is characterized in that, comprising:
Obtain the echoed signal that measured medium reflects, generate corresponding oscillogram;
According to described oscillogram, judge in described echoed signal, whether there is the coda wave signal that meets preset requirement;
If not, determine that measured medium is in non-material dummy status;
If so, calculate the position of described coda wave signal, judge that the position of described coda wave signal and the distance of described guided wave radar material level gauge end position are 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 gauge is in preset range, determine that described measured medium is for material dummy status.
2. method according to claim 1, is characterized in that, described in obtain the echoed signal that measured medium reflects, generate corresponding oscillogram, comprising:
Obtain the echoed signal that measured medium reflects;
According to predeterminated frequency, described echoed signal is sampled;
According to sampling result, generate the oscillogram of described echoed signal.
3. whether method according to claim 1, is characterized in that, described according to described oscillogram, judge in described echoed signal and exist the coda wave signal that meets preset requirement to comprise:
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 less than the requirement of default maximum amplitude;
If so, in definite described echoed signal, there is the coda wave signal that meets preset requirement;
If not, determine in described echoed signal and do not have the coda wave signal that meets preset requirement.
4. method according to claim 2, is characterized in that, in determining described echoed signal, exists while meeting the coda wave signal of preset requirement, and 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.
5. method according to claim 2, is characterized in that, in determining described echoed signal, exists while meeting the coda wave signal of preset requirement, and 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.
6. the empty recognition device of material, is characterized in that, described device comprises:
Obtain the signal gathering unit of the echoed signal that measured medium reflects;
According to predeterminated frequency, the echoed signal that described signal gathering unit is collected samples, and generates the sampling unit of respective waveforms figure;
According to described oscillogram, judge the first judging unit that whether has the coda wave signal that meets preset requirement in described echoed signal;
When described the first judging unit is when the determination result is NO, determine that described measured medium is non-material dummy status;
When judgment result is that of described the first judging unit is, calculate the position computing unit of described coda wave signal;
Judge whether the second judging unit in preset range of the position of described coda wave signal and the distance of described guided wave radar material level gauge end position;
When judgment result is that of described the second judging unit is, determine that described measured medium is for material dummy status.
7. device according to claim 6, is characterized in that, described device also comprises: the display unit that shows the oscillogram of described echoed signal.
8. device according to claim 6, is characterized in that, described device also comprises: when definite measured medium is material dummy status, and the alarm unit of output alarm signal.
9. device according to claim 7, is characterized in that, described display unit is liquid crystal display.
10. device according to claim 8, is characterized in that, described alarm unit comprises: 4-20mA electric 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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| CN104568059A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Empty tank measuring method by use of guide wave radar level meter |
| CN109357729A (en) * | 2018-11-13 | 2019-02-19 | 中国科学院沈阳自动化研究所 | A method of based on guide wave radar liquid level gauge measurement liquid circle position |
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Cited By (4)
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| CN109357729A (en) * | 2018-11-13 | 2019-02-19 | 中国科学院沈阳自动化研究所 | A method of based on guide wave radar liquid level gauge measurement liquid circle position |
| 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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