CN106768177A - Liquid level sensor, sensing system and liquid level measuring method - Google Patents
Liquid level sensor, sensing system and liquid level measuring method Download PDFInfo
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- CN106768177A CN106768177A CN201710177345.8A CN201710177345A CN106768177A CN 106768177 A CN106768177 A CN 106768177A CN 201710177345 A CN201710177345 A CN 201710177345A CN 106768177 A CN106768177 A CN 106768177A
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- 239000003990 capacitor Substances 0.000 claims description 22
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
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Abstract
The invention provides a kind of liquid level sensor, sensing system and liquid level measuring method；Wherein, the liquid level sensor includes the liquid level emasuring device and data processing equipment that are electrically connected to each other；The liquid level emasuring device includes inner and outer electrodes；Interior electrode includes the tubulose sub-electrode of multistage arranged in co-axial alignment；Mutually insulated between adjacent sub-electrode；External electrode is shaped as tubulose；Internal diameter of the internal diameter of external electrode more than interior electrode；External electrode is nested in the outside of interior electrode；External electrode is coaxially disposed with interior electrode；Multistage sub-electrode is electrically connected with data processing equipment respectively；The sub-electrode of top is set to gas medium change and demarcates sub-electrode in multistage sub-electrode；The sub-electrode of least significant end is set to liquid medium change and demarcates sub-electrode in multistage sub-electrode；Data processing equipment is real-time and detects the capacitance of multistage sub-electrode simultaneously, and liquid level height value is exported according to capacitance.The present invention improves the measuring accuracy and stability of liquid level sensor.
Description
Technical field
The present invention relates to liquid level sensor technical field, more particularly, to a kind of liquid level sensor, sensing system and liquid
Position height measurement method.
Background technology
Capacitance level gauge is by measuring the change of electric capacity and then measuring the height of liquid level；When fluid to be measured medium soaks and surveys
When measuring the height change of capacitance electrode, there is corresponding change in the electric capacity of sensor；By detecting the change of capacitance, can obtain
To the height of liquid level.
Traditional capacitance level gauge is using single rapier metering system, condenser type liquid in the prior art as shown in Figure 1
The structural representation of position meter, the capacitance level gauge is made up of a measuring electrode, reference electrode (such as tube wall) and insulating barrier.When
Measured medium permittivity ε m relative constancies, in capacitance measurement rapier gaseous medium permittivity ε o also relative constancy when, be tested
Capacitance variations value is only relevant with liquid level changing value, and proportional.Capacitance level gauge in the prior art shown in Figure 2
Equivalent circuit diagram., in the case where the dielectric constant of liquid and air is invariable, Cx is suitable for its detection electric capacity for measured medium
In medium for the electric capacity Co and the electric capacity Cm that medium is liquid portion of air part are composed in parallel, and detection electric capacity Cx and liquid
Liquid level Hx is linearly proportional, therefore the liquid level Hx of measured medium can be just calculated according to the capacitance for detecting.
Existing measuring method is appropriate only for measured medium permittivity ε m relative constancies and gaseous state dielectric permittivity ε m
Relative constancy occasion；Due to the complexity of commercial Application environment, change level gauging site environment extremely complex, for example, quilt
The influence of the factors such as change, the interference of stray capacitance, temperature drift, the bridging of dielectric permittivity is surveyed, especially HTHP
Occasion, the minor variations of temperature and pressure can all cause that dielectric permittivity changes.The dielectric constant of same measured medium
Electrode measurement can be caused with gaseous medium change in dielectric constant in temperature, change in pressure, and capacitive measurement electrodes etc.
The influence of null value, these influences can cause existing liquid level gauge measurement error larger, reduce the accuracy of liquid level sensor.
For the problem that existing liquid level sensor accuracy is poor, effective solution is not yet proposed at present.
The content of the invention
In view of this, measured it is an object of the invention to provide a kind of liquid level sensor, sensing system and liquid level
Method, to improve the measuring accuracy and stability of liquid level sensor.
In a first aspect, a kind of liquid level sensor is the embodiment of the invention provides, including the level gauging dress being electrically connected to each other
Put and data processing equipment；The liquid level emasuring device includes inner and outer electrodes；Interior electrode includes the pipe of multistage arranged in co-axial alignment
Shape sub-electrode；Mutually insulated between adjacent sub-electrode；External electrode is shaped as tubulose；The internal diameter of external electrode is more than interior electrode
Internal diameter；External electrode is nested in the outside of interior electrode；External electrode is coaxially disposed with interior electrode；Multistage sub-electrode respectively with data processing
Device is electrically connected；The sub-electrode of top is set to gas medium change and demarcates sub-electrode in multistage sub-electrode；Multistage sub-electrode
The sub-electrode of middle least significant end is set to liquid medium change and demarcates sub-electrode；Data processing equipment is real-time and detects many cross-talks simultaneously
The capacitance of electrode, liquid level height value is exported according to capacitance.
With reference in a first aspect, the embodiment of the invention provides the first possible implementation method of first aspect, wherein, on
The tubulose sub-electrode for stating multistage arranged in co-axial alignment is fixedly installed on shaft insulation；Dead ring is provided between adjacent sub-electrode.
With reference in a first aspect, the embodiment of the invention provides second possible implementation method of first aspect, wherein, on
State interior electrode surface and be coated with insulating sleeve；The length of insulating sleeve is identical with the length of external electrode.
With reference in a first aspect, the embodiment of the invention provides the third possible implementation method of first aspect, wherein, on
State liquid level emasuring device to be connected with testing container in the form of linker, be arranged at the outside of testing container；Or；Level gauging
Device is arranged inside testing container.
With reference in a first aspect, the embodiment of the invention provides the 4th kind of possible implementation method of first aspect, wherein, on
Stating data processing equipment includes capacitive detection circuit and microprocessor；Capacitive detection circuit is used for real-time detection multistage sub-electrode
Capacitance, the capacitance of multistage sub-electrode is sent to microprocessor；Microprocessor is used for the capacitance according to multistage sub-electrode
Output liquid level height value.
With reference to the 4th kind of possible implementation method of first aspect, the 5th kind of first aspect is the embodiment of the invention provides
Possible implementation method, wherein, above-mentioned data processing equipment also includes external communication interface；External communication interface and microprocessor
Connection, for liquid level height value to be exported to monitoring outlay.
Second aspect, the embodiment of the invention provides a kind of level sensor system, and the system includes above-mentioned level sensing
Device, also including monitoring outlay.
The third aspect, the embodiment of the invention provides a kind of liquid level measuring method, and the method is by above-mentioned level sensing
Device is performed, and method includes：When detect sub-electrode that capacitance changes less than liquid level sensor top sub-electrode when,
The capacitance of the sub-electrode of data processing equipment real-time detection top；Electricity of the data processing equipment according to the sub-electrode of top
Capacitance determines that gas medium changes corrected parameter；It is higher than liquid level sensor most end when the sub-electrode that capacitance changes is detected
During the sub-electrode at end, the capacitance of the sub-electrode of data processing equipment real-time detection least significant end；Data processing equipment is according to most end
The capacitance of the sub-electrode at end determines that liquid medium changes corrected parameter；Data processing equipment is according to gas medium change amendment ginseng
Number, liquid medium change corrected parameter, the real-time capacitance of each sub-electrode, the standard capacitor-value of each sub-electrode and each
The length of sub-electrode, determines liquid height value in testing container；Wherein, standard capacitor-value is each sub-electrode for prestoring
Capacitance when medium is air.
With reference to the third aspect, the first possible implementation method of the third aspect is the embodiment of the invention provides, wherein, on
State data processing equipment and determine that gas medium changes corrected parameter according to the capacitance of the sub-electrode of top, including：Gas is situated between
Qualitative change corrected parameterWherein, n represents the sub-electrode of top；Cxn is the real-time top for obtaining
The capacitance of sub-electrode；Con is the standard capacitor-value of the sub-electrode of top；Hn is the length of the sub-electrode of top；It is above-mentioned
Data processing equipment determines that liquid medium changes corrected parameter according to the capacitance of the sub-electrode of least significant end, including：Liquid medium
Change corrected parameterWherein, 1 the sub-electrode of least significant end is represented；Cx1 is the son of the real-time least significant end for obtaining
The capacitance of electrode；Co1 is the standard capacitor-value of the sub-electrode of least significant end；H1 is the length of the sub-electrode of least significant end.
With reference to the first possible implementation method of the third aspect, second of the third aspect is the embodiment of the invention provides
Possible implementation method, wherein, above-mentioned data processing equipment changes corrected parameter, liquid medium change amendment according to gas medium
The length of parameter, the real-time capacitance, the standard capacitor-value of each sub-electrode and each sub-electrode of each sub-electrode, it is determined that treating
Liquid height value in xylometer, including：Liquid height value in testing container
Wherein, k represents each sub-electrode；Cxk is the capacitance of real-time each sub-electrode for obtaining；Cok is the standard of each sub-electrode
Capacitance；Hk is the length of each sub-electrode.
The embodiment of the present invention brings following beneficial effect：
A kind of liquid level sensor provided in an embodiment of the present invention and sensing system, by the pipe for setting multistage arranged in co-axial alignment
Shape sub-electrode, can shorten the measurement range of sensor, improve the certainty of measurement of liquid level sensor；Changed by gas medium and marked
Sub-electrode is demarcated in stator electrode and liquid medium change, and the parameter that measuring environment and measurement liquid carry out adaptability can be repaiied
Just, the adaptability of liquid level sensor is improve, and then improves the measuring accuracy and stability of liquid level sensor.
A kind of liquid level measuring method provided in an embodiment of the present invention, data processing equipment is arrived most according to real-time detection
The capacitance of the sub-electrode on top can determine gas medium change corrected parameter, and the least significant end arrived according to real-time detection son
The capacitance of electrode can determine that liquid medium changes corrected parameter；It is situated between finally according to gas medium change corrected parameter, liquid
Qualitative change corrected parameter, the real-time capacitance of each sub-electrode, the standard capacitor-value of each sub-electrode and each sub-electrode
Length, it may be determined that liquid height value in testing container；Which can make liquid level sensor realize automatic calibration, it is to avoid hand
It is dynamic to carry out zero graduation and full-scale calibration；Meanwhile, which can automatically adapt to measuring environment air dielectric and measurement liquid
The change of medium, it is to avoid because of the measurement error that measuring environment air dielectric or measurement liquid medium change cause, can be applicable
In various measurement occasion and use environments, the accuracy and adaptability of liquid sensor are substantially increased.
Other features and advantages of the present invention will be illustrated in the following description, also, the partly change from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages are in specification, claims
And specifically noted structure is realized and obtained in accompanying drawing.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
In order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art, below will be to specific
The accompanying drawing to be used needed for implementation method or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of capacitance level gauge in the prior art；
Fig. 2 is the equivalent circuit diagram of capacitance level gauge in the prior art；
Fig. 3 is a kind of structural representation of liquid level sensor provided in an embodiment of the present invention；
Fig. 4 is a kind of equivalent circuit diagram of liquid level sensor provided in an embodiment of the present invention；
Fig. 5 be a kind of liquid level sensor provided in an embodiment of the present invention in, the concrete structure schematic diagram of interior electrode；
Fig. 6 is the concrete structure schematic diagram of another liquid level sensor provided in an embodiment of the present invention；
Fig. 7 is a kind of structural representation of level sensor system provided in an embodiment of the present invention；
Fig. 8 is a kind of flow chart of liquid level measuring method provided in an embodiment of the present invention.
Icon：
300- data processing equipments；Electrode in 301-；302- external electrodes；Sub-electrode is demarcated in the change of 301a- gas mediums；
Sub-electrode is demarcated in the change of 301b- liquid mediums；303- interfaces；304- communicating pipes；305- passages；306- inlet openings；307- leaks
Fluid apertures；500- shaft insulations；501- dead rings；502- insulating sleeves.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Technical scheme be clearly and completely described, it is clear that described embodiment is a part of embodiment of the invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of protection of the invention.
In view of the problem that existing liquid level sensor accuracy is poor, a kind of level sensing is the embodiment of the invention provides
Device, sensing system and liquid level measuring method, the technology can apply under various measuring environments, the liquid level of various liquid
Detection；The technology can be realized using related software and hardware, is described below by embodiment.
Embodiment one：
A kind of liquid level sensor shown in the structural representation and Fig. 4 of a kind of liquid level sensor shown in Figure 3 etc.
Effect circuit diagram, the liquid level sensor includes the liquid level emasuring device and data processing equipment 300 that are electrically connected to each other；
The liquid level emasuring device includes interior electrode 301 and external electrode 302；The interior electrode 301 includes multistage arranged in co-axial alignment
Tubulose sub-electrode；Mutually insulated between adjacent sub-electrode；The external electrode is shaped as tubulose；The internal diameter of external electrode is more than interior electricity
The internal diameter of pole；External electrode is nested in the outside of interior electrode；External electrode is coaxially disposed with interior electrode；
Above-mentioned multistage sub-electrode is electrically connected with data processing equipment 300 respectively；The sub-electrode of top in multistage sub-electrode
It is set to gas medium change and demarcates sub-electrode 301a；The sub-electrode of least significant end is set to liquid medium change in multistage sub-electrode
Demarcate sub-electrode 301b；
Above-mentioned data processing equipment 300 is real-time and detects the capacitance of multistage sub-electrode simultaneously, and liquid is exported according to capacitance
Position height value.
When actually realizing, above-mentioned interior electrode 301 and external electrode 302 were arranged in communicating pipe 304, the external electrode 302
Upper end is provided with passage 305；The lower end of the external electrode 302 is provided with inlet opening 306；The position of the inlet opening 306 with connect
The interface 303 of the bottom of pipe 304 is flushed；The bottom of the external electrode 302 is provided with liquid-leaking nozzle 307.
As shown in figure 4, parallel connection of the sub-electrode of multistage mutually insulated equivalent to electric capacity, its total capacitance is equivalent to all son electricity
The capacitance sum of pole, in Fig. 4 by taking seven cross-talk electrodes as an example；The data processing equipment passes through the electricity of the multistage sub-electrode for detecting
Capacitance, can calculate the liquid level height value being filled between inner and outer electrodes.
When actually realizing, above-mentioned gas media variations demarcate sub-electrode and the length of sub-electrode is demarcated in liquid medium change
Etc. parameter, compared with other sub-electrodes, can be with identical, it is also possible to different；Generally, in order to ensure liquid level sensor accuracy and
Stability, above-mentioned gas media variations are demarcated sub-electrode and use the consistent circle of appearance and size with liquid medium change demarcation sub-electrode
Column type capacitor；Each sub-electrode forms the capacitance sensor of multiple small-ranges from top to bottom.
Above-mentioned multistage sub-electrode individually lead can be connected with data processing equipment respectively, the electric capacity between each sub-electrode
Value and data transfer do not interfere with each other.
A kind of liquid level sensor provided in an embodiment of the present invention, by setting the tubulose sub-electrode of multistage arranged in co-axial alignment, can
To shorten the measurement range of sensor, the certainty of measurement of liquid level sensor is improved；By gas medium change demarcate sub-electrode and
Sub-electrode is demarcated in liquid medium change, and the parameters revision of adaptability can be carried out to measuring environment and measurement liquid, improves liquid
The adaptability of level sensor, and then improve the measuring accuracy and stability of liquid level sensor.
In a kind of liquid level sensor shown in Figure 5, the concrete structure schematic diagram of interior electrode；With seven cross-talks in the Fig. 5
As a example by electrode；As shown in Figure 5, the tubulose sub-electrode of above-mentioned multistage arranged in co-axial alignment is fixedly installed on shaft insulation 500；Adjacent son
Dead ring 501 is provided between electrode.When actually realizing, the hop count of sub-electrode is more, the measuring accuracy of liquid level sensor
Higher, the actual demand that the quantity of sub-electrode can be according to user to liquid level sensor is configured, and the quantity of the sub-electrode can
Think three sections, five sections, seven sections or nine sections etc..
Generally, fluid to be measured and surrounding air are filled between inner and outer electrodes, different types of liquid or not
Different electric conductivities are respectively provided with the surrounding air under measuring environment, in order to avoid electric conductivity filled media high causes electric capacity
Electric discharge, above-mentioned interior electrode surface is coated with insulating sleeve 502；The length of the insulating sleeve 502 is identical with the length of external electrode；Should
Insulating sleeve can be corrosion-resistant quartz glass tube, ceramic insulating tube and four fluorine tube etc., high temperature resistant, resist and stick material；By setting
Put between insulating sleeve avoids inner and outer electrodes and discharge, improve the safety and stability of liquid level sensor.
May be more elongated in view of above-mentioned liquid level sensor, when inserting liquid, bubble may be entered in sensor, lead
Cause liquid level measurement error larger, above-mentioned external electrode 302 includes the metal tube with passage.Can be with by setting passage
Liquid level sensor bubble is discharged into, the certainty of measurement of liquid level sensor is improved.In addition, when actually realizing, above-mentioned metal tube
Specific material do not limit, the position of above-mentioned passage can be set according to the actual demand of user.
In order to improve the applicability of liquid level sensor, above-mentioned liquid level emasuring device is connected in the form of linker with testing container
Connect, be arranged at the outside of testing container；As shown in figure 3, by interface 303, liquid level sensor can be arranged at into testing container
Outside communicating pipe 304 in.Above-mentioned liquid level emasuring device can also be arranged inside testing container.
The concrete structure schematic diagram of another liquid level sensor shown in Figure 6；In the liquid level sensor, data processing
Device includes capacitive detection circuit 600 and microprocessor 601；The capacitive detection circuit 600 is electrically connected with liquid level emasuring device 606
Connect, for the capacitance of real-time detection multistage sub-electrode, the capacitance of multistage sub-electrode is sent to microprocessor；The microprocessor
Device 601 can be by chip microcontroller, and the microprocessor 601 is used to export liquid level according to the capacitance of multistage sub-electrode
Value.Specifically, above-mentioned capacitive detection circuit is connected with interior electrode, further, many in the capacitive detection circuit and interior electrode
Cross-talk electrode is connected respectively.When actually realizing, above-mentioned capacitive detection circuit and microprocessor can be by containing capacitance detecting
The transmitter of the signal processing circuit such as circuit and microprocessor realizes that the capacitive detection circuit can be the special core of capacitance detecting
Piece.
Above-mentioned data processing equipment also includes external communication interface；The external communication interface is connected with microprocessor, is used for
Liquid level height value is exported to monitoring outlay；The external communication interface includes 4~20mA interfaces 602 and communication serial port 603；
Liquid level height value is converted into above-mentioned microprocessor the standard industry electric current or other data signals of 4~20mA, by 4~20mA
Interface 602 is exported to secondary meter or other industrial control equipments；Microprocessor can also go here and there liquid level height value by communicating
Mouth 603 is exported to coherent signal receiving device.
The data that aforesaid way can measure liquid level sensor send to monitoring outlay in several ways, improve
The general applicability of liquid level sensor.
Further, above-mentioned data processing equipment is arranged at the top of liquid level emasuring device；The data processing equipment is sealed
In in housing, housing is connected with the external electrode of liquid level sensor.In order to further improve the controllability of above-mentioned liquid level sensor, on
State and be provided with housing display screen 604 and button 605；The display screen 604 and button 605 are electrically connected with microprocessor 601；Should
Display screen 604 is used to show the liquid level of microprocessor output；The button 605 can join so that site setup liquid level sensor is related
Number.Which improves the controllability of liquid level sensor.
In the present embodiment, as a result of capacitive detection circuit, the capacitance of each cross-talk electrode can be simultaneously detected, it is to avoid
Capacitance detecting analog circuit and the problems such as select the parasitic capacitance that each section of capacitor strap comes using switching switch plate, improves circuit
Stability and accuracy, measure while realizing each section of sensor capacitance value, and the signal eliminated between measuring electrode is mutual
Interference problem.Multiple electric capacity, the change of liquid level or the change of dielectric permittivity are formd between multiple sub-electrodes and external electrode
Change causes the change of multiple sub-electrode capacitances, and above-mentioned data processing equipment measures the capacitance of each electrode, and calculates liquid
Place value.The data processing equipment can be realized by transmitter.
The function of the transmitter is to be scanned detection to the electric capacity of each sub-electrode, and capacitance is converted into digital quantity,
Sending to microprocessor (for example, single-chip microcomputer) carries out treatment computing.Transmitter is by special capacitive detection circuit and monolithic mechanism
Into；The course of work of the transmitter is as follows：Capacitive detection circuit measures the capacitance of each sub- electric capacity, and computing is carried out by single-chip microcomputer
Reason, often measurement obtains one group of capacitance and can just calculate a liquid level height value, while liquid level height value is converted to 4~
20mA standard industries electric current or other data signals, for used by secondary meter or Industry Control.
Embodiment two：
Corresponding to the liquid level sensor provided in above-described embodiment one, a kind of level sensor system shown in Figure 7
Structural representation；The system includes above-mentioned liquid level sensor 700, also including monitoring outlay 701.Specifically, it is above-mentioned outer
Portion's monitoring device can be secondary meter, other industrial control equipments or coherent signal receiving device etc..
Level sensor system provided in an embodiment of the present invention, the liquid level sensor provided with above-described embodiment has identical
Technical characteristic, so can also solve identical technical problem, reach identical technique effect.
Embodiment three：
Corresponding to the liquid level sensor provided in above-described embodiment one, a kind of liquid level measurement side shown in Figure 8
The flow chart of method, the method is performed by above-mentioned liquid level sensor, and method comprises the following steps：
Step S802, when detecting sub-electrode of the sub-electrode less than liquid level sensor top that capacitance changes
When, the capacitance of the sub-electrode of data processing equipment real-time detection top；
Step S804, data processing equipment determines gas medium change amendment ginseng according to the capacitance of the sub-electrode of top
Number；
During the normal use of liquid level sensor, when the son electricity of the height less than liquid level sensor top of liquid level
During pole, data processing equipment can be with the current capacitance of the sub-electrode of real-time detection top, with according to current capacitance
Gas medium change corrected parameter is updated, which can still ensure gas medium when current environment air changes
Change corrected parameter is corresponding with current environment air, further improves adaptability of the liquid level sensor to current environment air.
Step S806, when detecting sub-electrode of the sub-electrode higher than liquid level sensor least significant end that capacitance changes
When, the capacitance of the sub-electrode of data processing equipment real-time detection least significant end；
Step S808, data processing equipment determines liquid medium change amendment ginseng according to the capacitance of the sub-electrode of least significant end
Number；
During normal use, when sub-electrode of the liquid level higher than least significant end, data processing is filled liquid level sensor
Put the capacitance of the sub-electrode that can detect least significant end；And determine that liquid medium changes corrected parameter according to the capacitance；The liquid
Body media variations corrected parameter is corresponding with current testing liquid, to improve adaptation of the liquid level sensor to current testing liquid
Property.
Because the capacitance that data processing equipment surveys the sub-electrode of least significant end has real-time, when testing liquid changes
When, data processing equipment can in time detect the capacitance of the sub-electrode of current least significant end；And according to current capacitance more
New liq media variations corrected parameter；Liquid medium change corrected parameter is corresponding with current testing liquid, further improves
Adaptability of the liquid level sensor to current testing liquid.
Step S810, data processing equipment changes corrected parameter, liquid medium change corrected parameter, each according to gas medium
The length of the real-time capacitance, the standard capacitor-value of each sub-electrode and each sub-electrode of individual sub-electrode, determines testing container
Interior liquid height value；Wherein, standard capacitor-value is the capacitance when medium of each sub-electrode for prestoring is air.Specifically
Ground, the standard capacitor-value is the capacitance that each sub-electrode is measured under room temperature environment in air dielectric.
A kind of liquid level measuring method provided in an embodiment of the present invention, data processing equipment is arrived most according to real-time detection
The capacitance of the sub-electrode on top can determine gas medium change corrected parameter, and the least significant end arrived according to real-time detection son
The capacitance of electrode can determine that liquid medium changes corrected parameter；It is situated between finally according to gas medium change corrected parameter, liquid
Qualitative change corrected parameter, the real-time capacitance of each sub-electrode, the standard capacitor-value of each sub-electrode and each sub-electrode
Length, it may be determined that liquid height value in testing container；Which can make liquid level sensor realize automatic calibration, it is to avoid hand
It is dynamic to carry out zero graduation and full-scale calibration；Meanwhile, which can automatically adapt to measuring environment air dielectric and measurement liquid
The change of medium, it is to avoid because of the measurement error that measuring environment air dielectric or measurement liquid medium change cause, can be applicable
In various measurement occasion and use environments, the accuracy and adaptability of liquid sensor are substantially increased.
Specifically, above-mentioned data processing equipment determines gas medium change amendment according to the capacitance of the sub-electrode of top
Parameter, can be accomplished in the following manner：
Gas medium changes corrected parameter
Wherein, n represents the sub-electrode of top；Cxn is the capacitance of the sub-electrode of the real-time top for obtaining；Con is
The standard capacitor-value of the sub-electrode of top；Hn is the length of the sub-electrode of top；
Above-mentioned data processing equipment determines that liquid medium changes corrected parameter according to the capacitance of the sub-electrode of least significant end, can
To be accomplished in the following manner：
Liquid medium changes corrected parameter
Wherein, 1 the sub-electrode of least significant end is represented；Cx1 is the capacitance of the sub-electrode of the real-time least significant end for obtaining；Co1 is
The standard capacitor-value of the sub-electrode of least significant end；H1 is the length of the sub-electrode of least significant end.
In aforesaid way, by the electric capacity of the sub-electrode of the capacitance and least significant end of the sub-electrode of the real-time top for obtaining
The top and the standard capacitor-value and top of the sub-electrode of least significant end that be worth, prestore and the sub-electrode of least significant end
Length, you can obtain gas medium change corrected parameter and the liquid medium under current measuring environment air and testing liquid medium
Change corrected parameter, realizes the adaptability according to measuring environment and measurement liquid medium, so as to improve liquid sensor
Accuracy.
Under work condition environment, M1 and Mn is constantly updated, for the survey that modifying factor liquid or Gases dielectric constant change cause
Value error, so that the liquid level sensor can automatically adapt to the change of medium, it is ensured that measured value it is accurate.
Liquid level sensor provided in an embodiment of the present invention in normal work, because each sub-electrode length can be according to measurement
Range determines into isometric or proportional structure type, liquid level sensor easily can be changed by a liquid level
Habit process, is automatically obtained zero graduation and the full scale calibration of liquid level.Liquid enters the 1st cross-talk electricity when liquid level sensor is just powered up
Pole, using default Cx1 values, judge liquid enter after the 2nd cross-talk electrode using the Cx1 values of Real-time Collection be M1 values automatically more
Newly；If liquid returns to the 1st cross-talk electrode by the 2nd cross-talk electrode, the last time that now liquid level is collected in the 2nd cross-talk electrode
The M1 values that Cx1 is calculated no longer update；Equally, the calibration value according to setting updates threshold value, when judgement liquid enters the 7th cross-talk electrode
When M7 no longer update, but use the last time updated value of liquid level electric capacity calibration value M7 at the 6th section.
Further, above-mentioned data processing equipment changes corrected parameter, liquid medium change amendment ginseng according to gas medium
Number, the length of the real-time capacitance, the standard capacitor-value of each sub-electrode and each sub-electrode of each sub-electrode, determine to be measured
Liquid height value in container, can be accomplished in the following manner：
Liquid height value in testing container
Wherein, k represents each sub-electrode；Cxk is the capacitance of real-time each sub-electrode for obtaining；Cok is each height electricity
The standard capacitor-value of pole；Hk is the length of each sub-electrode.
In aforesaid way, the mistake that current measuring environment and measurement liquid medium cause is considered when calculating liquid height value
Difference, and the amendment of error is carried out by gas medium change corrected parameter and liquid medium change corrected parameter, improve liquid
The accuracy of sensor.
Example IV：
Corresponding to a kind of liquid level measuring method provided in above-described embodiment three, the present embodiment is with preferred seven cross-talk
As a example by electrode, liquid level measuring method is specifically described.
Under relative ideal environment, the electric capacity computing formula of each cross-talk electrode is：
Wherein, n is 1,2,3,4,5,6,7；Con is capacitance when air is full of in the n-th cross-talk electrode；Cmn is n-th section
Capacitance when hydraulically full in sub-electrode；
Con and Cmn computing formula are as follows：
Under working condition measuring environment, i.e., in the environment of liquid and dielectric constant of air are continually changing by ectocine, if the 1st
Section demarcates section (equivalent to above-mentioned " sub-electrode is demarcated in liquid medium change ", namely " least significant end for liquid dielectric change electric capacity
Sub-electrode "), the 7th section be Gases dielectric constant change electric capacity demarcate section (equivalent to it is above-mentioned " gas medium change demarcate son electricity
Pole ", namely " sub-electrode of top ").Each cross-talk electrode is normal with the dielectric of gas because liquid body dielectric constant is continually changing
The influences being continually changing are counted, the total capacitance value Cxn that now liquid sensor is measured is：
Wherein, n is 1,2,3,4,5,6,7；For the unit height electric capacity that air section change in dielectric constant causes becomes
Change；It is the change of the unit height capacitance that the change of liquid segment dielectric constant causes；Cx1 is under work condition environment
The capacitance of the 1st cross-talk electrode is measured in real time；Cx7 is the capacitance for measuring the 7th cross-talk electrode in real time under work condition environment；Cm1
It is it is assumed that measured medium ideally measures the full capacitance that obtains the 1st cross-talk electrode；Co1 and Co7 be respectively the 1st section and
The empty capacitance that 7th section of capacitance sensor is measured under normal air environment；H1 and H7 are respectively the 1st cross-talk electrode and the 7th section
The physical height of sub-electrode.
The 1st cross-talk electrode as self-adapting calibration section is set, i.e., when just upper electric, liquid enters the 1st section of the 1st cross-talk electrode of collection
The process of capacitance Cx1 is exactly a self study stage.Liquid stops self study process and enters measurement rank in real time after entering the 2nd section
Section, now the unit height capacitance variation of the 1st cross-talk electrodeIt is exactly each section of capacitance sensor Measuring Dielectric Constant
It is continually changing the calibration value of liquid；Similarly, measured medium does not enter into the 7th section of electric capacity measured during the 7th section of capacitance sensor
Sensor units height capacitance variationFor demarcate each section because dielectric constant of air is continually changing and caused by electricity
Hold change.
Capacitance when liquid height is located at the 2nd cross-talk electrode can be obtained according to above-mentioned formula is：
It is similarly obtained：
Cx3=Co3+M1 × Hx3+M7 × H3-M7 × Hx3
Cx4=Co4+M1 × Hx4+M7 × H4-M7 × Hx4
Cx5=Co5+M1 × Hx5+M7 × H5-M7 × Hx5
Cx6=Co6+M1 × Hx6+M7 × H6-M7 × Hx6
Cx7=Co7+M1 × Hx7+M7 × H7-M7 × Hx7
Cx1=Co1+M1 × Hx1+M7 × H1-M7 × Hx1
Under the physical arrangement state of metastable environment and relative ideal, the capacitance change of unit height is equal,
There is equation：
Wherein：
Because 7 cross-talk electrodes are parallel relationship, so having：C=Cx1+Cx2+Cx3+Cx4+Cx5+Cx6+Cx7；
Cx1+Cx2+Cx3+Cx4+Cx5+Cx6+Cx7
=Co1+Co2+Co3+Co4+Co5+Co6+Co7+M1
×(Hx1+Hx2+Hx3+Hx4+Hx5+Hx6+Hx7)+M7
×(H1+H2+H3+H4+H5+H6+H7)-M7
×(Hx1+Hx2+Hx3+Hx4+Hx5+Hx6+Hx7)
So there is following equation：
Cx1+Cx2+Cx3+Cx4+Cx5+Cx6+Cx7
-(Co1+Co2+Co3+Co4+Co5+Co6+Co7)-M7
×(H1+H2+H3+H4+H5+H6+H7)
=M1 × (Hx1+Hx2+Hx3+Hx4+Hx5+Hx6+Hx7)-M7
×(Hx1+Hx2+Hx3+Hx4+Hx5+Hx6+Hx7)
Continue to be derived from：
Wherein：Hx is liquid height value；Cx1, Cx2, Cx3, Cx4, Cx5, Cx6, Cx7 are measured in real time under work condition environment
The capacitance of each cross-talk electrode；Co1, Co2, Co3, Co4, Co5, Co6, Co7 are the standard null capacitances of each cross-talk electrode；H1、
H2, H3, H4, H5, H6 and H7 are respectively the physical heights (equivalent to " length of sub-electrode ") of each cross-talk electrode.
Liquid enters the 1st cross-talk electrode when liquid sensor is just powered up, using default Cx1 values, if liquid is by the 2nd section
Sub-electrode returns to the 1st cross-talk electrode, and the M1 values that the last time Cx1 values that now liquid level is collected in the 2nd cross-talk electrode are calculated are not
Update again；When liquid enters the 7th cross-talk electrode, M7 no longer updates, but uses liquid level electric capacity calibration value M7 at the 6th section
Last time updated value.
Below its level value in tested media is calculated as a example by seven sections of capacitance sensors with single long length as 40mm.It is first
First measure each section of standard null value of capacitance sensor (can be determined before equipment is dispatched from the factory and be stored in equipment in)：
Co1=42.32p Co2=43.3p Co3=41.34p Co4=40.26p Co5=38.5p Co6=37.4p
Co7=36.2p；
One group of capacitance is gathered under work condition environment：
Cx1=49.94p Cx2=50.64p Cx3=46.98p Cx4=40.34p
Cx5=38.56p Cx6=37.46p Cx7=36.26p；
H1=40mm H2=40mm H3=40mm H4=40mm
H5=40mm H6=40mm H7=40mm；
Above-mentioned one group of data according to measuring can calculate corresponding liquid level：
Calculating process is as follows：
It can be seen that liquid level is in the 3rd fragment position, the liquid level height value for calculating is 108.15mm.
In the prior art, the liquid level calculation of the capacitance level gauge shown in application drawing 1 is as follows for contrast：
Capacitance Co when in capacitance sensor full of air, capacitance Cm when hydraulically full are respectively：
When hydraulically full medium level is Hx in capacitance sensor, capacitance Cx when being highly H-Hx full of air dielectric
For：
Obtained by (1) formula：
Drawn by (2) formula：
Wherein：It is the changing value of unit height electric capacity when capacitance sensor is by empty to full；Liquid when Hx is measurement
Position height value；Cx：Measurement capacitance when rapier is measured；Co：Electric capacity when capacitance sensor is full of air under demarcation state is surveyed
Value；Cm：Measurement capacitance when capacitance sensor is full of measured medium under demarcation state；H：Under field calibration state, electric capacity is surveyed
Value changes corresponding measured medium liquid level changing value, i.e., the maximum height value that level value can be measured from Co to Cm.
The above-mentioned change for using traditional single rapier capacitance level gauge that measured medium dielectric constant is not compensated because of itself,
The capability of influence of the factors such as interference, temperature drift, the bridging of stray capacitance, causes under complex measuring environment, error
It is larger.
Contrastingly, liquid level measuring method provided in an embodiment of the present invention, using multistage electrode type liquid level sensor
Measurement, separate cylinder of multistage is divide into by one section of cylindrical capacitance sensor in conventional condenser level gauging
Electrode, each section parallel with one another, mutually insulated and individual leads, equivalent to foring multiple small-range capacitance sensings from top to bottom
Device.Each section of electric capacity detection simultaneously, the overall measurement result of liquid level is obtained using the measurement result of multiple sub-electrodes.As a result of
Multiple electrode structure, equivalent to detection range is shortened, improves detection resolution and precision, and need not carry out manually for zero quarter
Degree and full scale are calibrated, and can realize automatic calibration and automatic adaptation media variations, overcome the change of the dielectric constant of liquid
And the error for causing, certainty of measurement is substantially increased, make liquid level gauge that there is versatility.
Liquid level sensor provided in an embodiment of the present invention, sensing system and liquid level measuring method, make condenser type liquid
Position meter can be applied to various measurement occasion and use environments.The dielectric that the liquid level sensor passes through real-time monitoring liquids and gases
Constant change come it is automatic correct the influence that change brings to liquid level height value, and eliminate in the prior art parasitic capacitance to surveying
The influence that the amount degree of accuracy is caused, to realize more accurate continuous measurement.
Liquid level sensor provided in an embodiment of the present invention, sensing system and liquid level measuring method, there is provided a kind of
Influence that can be produced to temperature, pressure, Media density, dielectric constant, environmental condition, power source change etc. carries out automatic compensation
Multielectrode capacitance sensor and its liquid level computational methods, enable liquid level sensor to be applied to various measurement occasions and use ring
Border.In the liquid level sensor, multielectrode structure design makes level gauging by realizing on-line automatic compensation, real-time monitoring liquid
The change in dielectric constant of body and gas carrys out the automatic influence corrected and change and brought to liquid level height value, and eliminates prior art
The influence that middle parasitic capacitance is caused to accuracy of measurement, it is high with accuracy of measurement to realize more accurate continuous measurement, surely
It is qualitative good, it is easy to install, measurement electric capacity non-blind area the advantages of.
If the function is to realize in the form of SFU software functional unit and as independent production marketing or when using, can be with
Storage is in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used to so that a computer equipment (can be individual
People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
Finally it should be noted that：Embodiment described above, specific embodiment only of the invention, is used to illustrate the present invention
Technical scheme, rather than its limitations, protection scope of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those within the art that：Any one skilled in the art
The invention discloses technical scope in, it can still modify to the technical scheme described in previous embodiment or can be light
Change is readily conceivable that, or equivalent is carried out to which part technical characteristic；And these modifications, change or replacement, do not make
The essence of appropriate technical solution departs from the spirit and scope of embodiment of the present invention technical scheme, should all cover in protection of the invention
Within the scope of.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (10)
1. a kind of liquid level sensor, it is characterised in that including the liquid level emasuring device and data processing equipment that are electrically connected to each other；
The liquid level emasuring device includes inner and outer electrodes；The interior electrode includes the tubulose electricity of multistage arranged in co-axial alignment
Pole；Mutually insulated between the adjacent sub-electrode；The external electrode is shaped as tubulose；The internal diameter of the external electrode is more than institute
State the internal diameter of interior electrode；The external electrode is nested in the outside of the interior electrode；The external electrode coaxially sets with the interior electrode
Put；
Sub-electrode described in multistage is electrically connected with the data processing equipment respectively；The sub-electrode of top in sub-electrode described in multistage
It is set to gas medium change and demarcates sub-electrode；The sub-electrode of least significant end is set to liquid medium change in sub-electrode described in multistage
Demarcate sub-electrode；
The data processing equipment is real-time and detects the capacitance of sub-electrode described in multistage simultaneously, and liquid is exported according to the capacitance
Position height value.
2. liquid level sensor according to claim 1, it is characterised in that the tubulose sub-electrode of the multistage arranged in co-axial alignment is consolidated
Surely it is arranged on shaft insulation；Dead ring is provided between the adjacent sub-electrode.
3. liquid level sensor according to claim 1, it is characterised in that the interior electrode surface is coated with insulating sleeve；
The length of the insulating sleeve is identical with the length of the external electrode.
4. liquid level sensor according to claim 1, it is characterised in that the liquid level emasuring device is in the form of linker
It is connected with testing container, is arranged at the outside of the testing container；
Or；The liquid level emasuring device is arranged inside testing container.
5. liquid level sensor according to claim 1, it is characterised in that the data processing equipment includes capacitance detecting electricity
Road and microprocessor；
The capacitive detection circuit is used for the capacitance of sub-electrode described in real-time detection multistage, by the electric capacity of sub-electrode described in multistage
Value is sent to the microprocessor；
The microprocessor is used for the capacitance output liquid level height value of the sub-electrode according to multistage.
6. liquid level sensor according to claim 5, it is characterised in that the data processing equipment also includes PERCOM peripheral communication
Interface；
The external communication interface is connected with the microprocessor, is set for the liquid level height value to be exported to outside monitoring
It is standby.
7. a kind of level sensor system, it is characterised in that the system includes any described level sensings of claim 1-6
Device, also including monitoring outlay.
8. a kind of liquid level measuring method, it is characterised in that methods described is by any described level sensings of claim 1-6
Device is performed, and methods described includes：
When detect sub-electrode that capacitance changes less than liquid level sensor top sub-electrode when, data processing equipment
The capacitance of the sub-electrode of real-time detection top；
The data processing equipment determines that gas medium changes corrected parameter according to the capacitance of the sub-electrode of the top；
When detect sub-electrode that capacitance changes higher than liquid level sensor least significant end sub-electrode when, the data processing
The capacitance of the sub-electrode of device real-time detection least significant end；
The data processing equipment determines that liquid medium changes corrected parameter according to the capacitance of the sub-electrode of the least significant end；
Data processing equipment changes corrected parameter, liquid medium change corrected parameter, each height according to the gas medium
The length of the real-time capacitance, the standard capacitor-value of each sub-electrode and each sub-electrode of electrode, determines liquid in testing container
Height value；Wherein, the standard capacitor-value is the capacitance when medium of each sub-electrode for prestoring is air.
9. method according to claim 8, it is characterised in that son electricity of the data processing equipment according to the top
The capacitance of pole determines that gas medium changes corrected parameter, including：
Gas medium changes corrected parameter
Wherein, n represents the sub-electrode of top；Cxn is the capacitance of the sub-electrode of the real-time top for obtaining；Con is most to push up
The standard capacitor-value of the sub-electrode at end；Hn is the length of the sub-electrode of top；
The data processing equipment determines that liquid medium changes corrected parameter, bag according to the capacitance of the sub-electrode of the least significant end
Include：
Liquid medium changes corrected parameter
Wherein, 1 the sub-electrode of least significant end is represented；Cx1 is the capacitance of the sub-electrode of the real-time least significant end for obtaining；Co1 is most end
The standard capacitor-value of the sub-electrode at end；H1 is the length of the sub-electrode of least significant end.
10. method according to claim 9, it is characterised in that the data processing equipment becomes according to the gas medium
Change corrected parameter, liquid medium change corrected parameter, the real-time capacitance of each sub-electrode, the standard electric of each sub-electrode
The length of capacitance and each sub-electrode, determines liquid height value in testing container, including：
Liquid height value in testing container
Wherein, k represents each sub-electrode；Cxk is the capacitance of real-time each sub-electrode for obtaining；Cok is each sub-electrode
Standard capacitor-value；Hk is the length of each sub-electrode.
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