CN104457911B - A kind of liquid level detection system and liquid-level detecting method - Google Patents
A kind of liquid level detection system and liquid-level detecting method Download PDFInfo
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Abstract
The invention discloses a kind of liquid level detection system, comprising：Photoelectricity acquisition module, threshold calculation module, variance computing module, condition judgment module and the liquid level moment computing module being sequentially connected；Described photoelectricity acquisition module is used to gather photosignal in real time；Described threshold calculation module is used to store high state threshold value, low state threshold value, maximum stable variance and minimum stable variance；Described variance computing module is used for the variance that real-time opto-electronic value is calculated using mobile variance method；Described condition judgment module is used to judge photoelectricity value status；At the time of described liquid level moment computing module drops to photoelectricity acquisition module for obtaining testing liquid.The invention also discloses a kind of liquid-level detecting method.The present invention detects liquid level due in using moving method difference, under various circumstances, for different testing liquids, Accurate Detection of Liquid Level, strong antijamming capability.
Description
Technical field
The present invention relates to detection technique field, and in particular to a kind of liquid level detection system and liquid-level detecting method.
Background technology
With the development of electronic technology, progressively substitution manually detects liquid level to robot.Traditional level sensing
Method generally simply sets a certain fixed threshold, when photoelectricity value is more than threshold value, then judges that liquid level reaches.Such a determination methods
The shortcomings that it is as follows：(1) transparency of oil sample differs, when detecting relatively transparent oil sample, when its liquid blocks light photoelectricity value with
Photoelectricity value is all higher than set threshold value when not blocking light, then can not detect liquid level.(2) kinematic viscosity needs to survey at a constant temperature
Amount, when (such as 100 DEG C of constant temperature) measure at high temperature, photoelectricity value can change as temperature raises, when photoelectricity value minimum value
When alreading exceed threshold value, then liquid level can not be detected.(3) in liquid level due in reflection and refraction occur for light, and photoelectricity value may be high
Low to change back and forth, influence is smaller when moving quickly through photoelectricity by simply setting fixed threshold i.e. liquid level smaller on viscosity number, but
Larger to viscosity number is that liquid level has a great influence when passing slowly photoelectric tube, can not accurately catch liquid level, poor repeatability.
The content of the invention
It is an object of the invention to provide a kind of liquid level detection system and liquid-level detecting method, is examined using moving method difference
Liquid level due in is surveyed, under various circumstances, for different testing liquids, Accurate Detection of Liquid Level, strong antijamming capability.
In order to achieve the above object, the present invention is achieved through the following technical solutions：A kind of liquid level detection system, its feature
It is, comprising：
When the photoelectricity acquisition module, threshold calculation module, variance computing module, condition judgment module and the liquid level that are sequentially connected
Carve computing module；
Described photoelectricity acquisition module is used to gather photosignal in real time；
Described threshold calculation module is used to store high state threshold value, low state threshold value, maximum stable variance and minimum surely
Determine variance；
Described variance computing module is used for the variance that real-time opto-electronic value is calculated using mobile variance method；
Described condition judgment module is used to judge photoelectricity value status；
At the time of described liquid level moment computing module drops to photoelectricity acquisition module for obtaining testing liquid.
A kind of liquid-level detecting method, in liquid level detection system detect testing liquid by photoelectricity acquisition module when
Carve, be characterized in, comprise the steps of：
S1, the initialization liquid level detection system；
S2, photoelectricity acquisition module monitor photoelectricity value changes in real time, obtain real-time opto-electronic value；
S3, condition judgment module judge whether real-time opto-electronic value is in high state；
If it is not, then repeat step S2-S3；
If so, then perform step S4；
S4, liquid level moment computing module obtain the liquid level moment using default processing strategy.
Described step S1 is included：
S1.1, photoelectricity acquisition module obtain actual high state photoelectricity value and actual low state photoelectricity value；
S1.2, threshold calculation module calculate high state threshold according to actual high state photoelectricity value and actual low state photoelectricity value
Value, low state threshold value, maximum stable variance and minimum stable variance.
The actual high state photoelectricity value that photoelectricity acquisition module obtains in described step S1.1 is to block light without testing liquid
The photoelectricity value measured during electric acquisition module, the actual low state photoelectricity value that photoelectricity acquisition module obtains are blocked completely for testing liquid
The photoelectricity value measured during photoelectricity acquisition module.
Described step S3 is specifically included：
S3.1, variance computing module calculate the variance of real-time opto-electronic value using preset algorithm；
S3.2, condition judgment module judge whether the variance of real-time opto-electronic value is more than maximum stable variance；
If so, then real-time opto-electronic value enters dynamic process, step S2-S3 is repeated；
If it is not, then perform step S3.3；
S3.3, condition judgment module judge whether the variance of real-time opto-electronic value is less than minimum stable variance；
If it is not, then real-time opto-electronic value maintains dynamic process, step S2-S3 is repeated；
If so, then real-time opto-electronic value enters stable state, step S3.4 is performed；
S3.4, condition judgment module judge whether real-time opto-electronic value is less than low state threshold value；
If so, then real-time opto-electronic value enters low state, step S2-S3 is repeated；
If it is not, then perform step S3.5；
S3.5, condition judgment module judge whether real-time opto-electronic value is more than high state threshold value；
If it is not, then real-time opto-electronic value maintains dynamic process, step S2-S3 is repeated；
If so, then perform step S4.
Preset algorithm is mobile variance method in described step S3.1.
Described step S4 also comprising liquid level moment computing module draw real-time opto-electronic value curve map, the curve map with
Time is abscissa, and photosignal value is ordinate.
Described step S4 is specially：
S4.1, liquid level moment computing module are fitted straight line by initial data of the data of curve where dynamic process；
S4.2, fitting a straight line intersect with the horizontal line corresponding to actual low state photoelectricity value, corresponding to intersection point during abscissa
Between point be liquid level to be measured at the time of pass through photoelectricity acquisition module.
A kind of liquid level detection system of the present invention and liquid-level detecting method have advantages below compared with prior art：The present invention
Set threshold value is calculated all in accordance with actual conditions, the testing liquid to differ suitable for various transparencies；The present invention is logical
The change for crossing detection sample variance detects liquid level, strong antijamming capability；The present invention is according to sample variance come detection light Electrical change
Dynamic process, level sensing can be carried out under various temperature environments, temperature change is on it without influence；The present invention is in detection photoelectricity
After dynamic process, dynamic process is analyzed, can Accurate Detection of Liquid Level.
Brief description of the drawings
Fig. 1 is a kind of overall structure diagram of liquid level detection system of the present invention；
Fig. 2 is a kind of flow chart of liquid-level detecting method of the present invention；
Fig. 3 is liquid level due in calculated curve figure.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferable specific embodiment in detail, the present invention is further elaborated.
As shown in figure 1, a kind of liquid level detection system, comprising：The photoelectricity acquisition module 1 that is sequentially connected, threshold calculation module
2nd, variance computing module 3, condition judgment module 4 and liquid level moment computing module 5；Described photoelectricity acquisition module 1 is used for light
Electric signal is gathered in real time；Described threshold calculation module 2 is used to store high state threshold value, low state threshold value, maximum stable
Variance and minimum stable variance；Described variance computing module 3 is used for the variance that real-time opto-electronic value is calculated using mobile variance method；
Described condition judgment module 4 is used to judge photoelectricity value status；Described liquid level moment computing module 5 is to be measured for obtaining
At the time of liquid drops to photoelectricity acquisition module.
As shown in Fig. 2 in order to preferably describe systematic difference, the invention also discloses a kind of liquid-level detecting method, uses
At the time of detection testing liquid passes through photoelectricity acquisition module 1 in liquid level detection system, comprise the steps of：
S1, the initialization liquid level detection system；
S1.1, photoelectricity acquisition module 1 obtain actual high state photoelectricity value and actual low state photoelectricity value, wherein actual high shape
The photoelectricity value that state photoelectricity value measures when being and blocking photoelectricity acquisition module 1 without testing liquid, actual low state photoelectricity value is prepare liquid
The photoelectricity value measured during body fully shading light electricity acquisition module 1；
S1.2, threshold calculation module 2 calculate high state threshold according to actual high state photoelectricity value and actual low state photoelectricity value
Value, low state threshold value, maximum stable variance and minimum stablize variance, and high state threshold value (minSyHigh) takes 2/3 times in the present invention
ActSyHigh and 1/3 times of actSyLow sum, low state threshold value (maxSyLow) take 1/3 times actSyHigh and 2/3 times
ActSyLow sums, maximum stable variance (maxSeStable) take in certain sample interval photoelectricity value by actual low state photoelectricity
It is worth (actSyLow) mutation to the calculating variance of actual high state photoelectricity value (actSyHigh)/7, the stable variance of minimum
(minSeStable) certain decay can be carried out by maximum stable variance (maxSeStable) to obtain, the present invention takes
MaxSeStable/16 is as the minimum stable variance of system, i.e., more than high state threshold value, then the photoelectricity value is in high shape to photoelectricity value
State, photoelectricity value be less than low state threshold value then the photoelectricity value is in low state, be therebetween dynamic process, high state with it is low
State is also known as stable state；
S2, photoelectricity acquisition module 1 monitor photoelectricity value changes in real time, obtain real-time opto-electronic value, specifically (are directly deposited using DMA
Storage accesses) interrupt method acquisition photoelectricity value；
S3, condition judgment module 4 judge whether real-time opto-electronic value is in high state；
S3.1, variance computing module calculate the variance of real-time opto-electronic value using preset algorithm, and wherein preset algorithm is movement
Variance method；
S3.2, condition judgment module judge whether the variance of real-time opto-electronic value is more than maximum stable variance；
If so, then real-time opto-electronic value enters dynamic process, step S2-S3 is repeated；
If it is not, then perform step S3.3；
S3.3, condition judgment module judge whether the variance of real-time opto-electronic value is less than minimum stable variance；
If it is not, then real-time opto-electronic value maintains dynamic process, step S2-S3 is repeated；
If so, then real-time opto-electronic value enters stable state, step S3.4 is performed；
S3.4, condition judgment module judge whether real-time opto-electronic value is less than low state threshold value；
If so, then real-time opto-electronic value enters low state, step S2-S3 is repeated；
If it is not, then perform step S3.5；
S3.5, condition judgment module judge whether real-time opto-electronic value is more than high state threshold value；
If it is not, then real-time opto-electronic value maintains dynamic process, step S2-S3 is repeated；
If so, then perform step S4；
S4, liquid level moment computing module 5 obtain the liquid level moment using default processing strategy, avoid photoelectricity value height and change
Influenceed caused by judging liquid level, liquid level moment computing module draws the curve map of real-time opto-electronic value, and the curve map is with the time
For abscissa, photosignal value is ordinate；
Presetting processing strategy is
S4.1, liquid level moment computing module are fitted straight line by initial data of the data of curve where dynamic process；
S4.2, fitting a straight line intersect with the horizontal line corresponding to actual low state photoelectricity value, corresponding to intersection point during abscissa
Between point be liquid level to be measured at the time of pass through photoelectricity acquisition module.
Specifically, mobile variance method is to be located at moment tk=k Δ t, corresponding to obtained photoelectricity value isUsing the moment as
Center, it is rightAnd its data set of front and rear each m data compositionCarry out statistical analysis,
Average value isVariance isWherein Δ t is dynamic window, is
Dynamic sampling section, photoelectricity value variance is calculated in section, and the window elapses forward over time.
As shown in figure 3, with 0.024S × 10 in liquid level due in calculated curve figure4For abscissa, ordinate is collection
The photosignal arrived, it is fitted straight line by initial data of the data between A, B at 2 points, does extended line and actual low state light
Horizontal line where electric value intersects, and the abscissa corresponding to intersection point N is liquid level due in.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (2)
1. a kind of liquid-level detecting method, at the time of passing through photoelectricity acquisition module for detecting testing liquid in liquid level detection system,
Characterized in that, comprise the steps of：
S1, the initialization liquid level detection system；
S2, photoelectricity acquisition module monitor photoelectricity value changes in real time, obtain real-time opto-electronic value；
S3, condition judgment module judge whether real-time opto-electronic value is in high state；
If it is not, then repeat step S2-S3；
If so, then perform step S4；
S4, liquid level moment computing module obtain the liquid level moment using default processing strategy；
Described step S1 is included：
S1.1, photoelectricity acquisition module obtain actual high state photoelectricity value and actual low state photoelectricity value；
S1.2, threshold calculation module calculate high state threshold value, low according to actual high state photoelectricity value and actual low state photoelectricity value
State threshold, maximum stable variance and minimum stable variance；
The actual high state photoelectricity value that photoelectricity acquisition module obtains in described step S1.1 is adopted to block photoelectricity without testing liquid
Collect the photoelectricity value measured during module, the actual low state photoelectricity value that photoelectricity acquisition module obtains is testing liquid fully shading light electricity
The photoelectricity value measured during acquisition module；
Described step S3 is specifically included：
S3.1, variance computing module calculate the variance of real-time opto-electronic value using preset algorithm；
S3.2, condition judgment module judge whether the variance of real-time opto-electronic value is more than maximum stable variance；
If so, then real-time opto-electronic value enters dynamic process, step S2-S3 is repeated；
If it is not, then perform step S3.3；
S3.3, condition judgment module judge whether the variance of real-time opto-electronic value is less than minimum stable variance；
If it is not, then real-time opto-electronic value maintains dynamic process, step S2-S3 is repeated；
If so, then real-time opto-electronic value enters stable state, step S3.4 is performed；
S3.4, condition judgment module judge whether real-time opto-electronic value is less than low state threshold value；
If so, then real-time opto-electronic value enters low state, step S2-S3 is repeated；
If it is not, then perform step S3.5；
S3.5, condition judgment module judge whether real-time opto-electronic value is more than high state threshold value；
If it is not, then real-time opto-electronic value maintains dynamic process, step S2-S3 is repeated；
If so, then perform step S4；
Described step S4 also draws the curve map of real-time opto-electronic value comprising liquid level moment computing module, and the curve map is with the time
For abscissa, photosignal value is ordinate；
Described step S4 is specially：
S4.1, liquid level moment computing module are fitted straight line by initial data of the data of curve where dynamic process；
S4.2, fitting a straight line intersect with the horizontal line corresponding to actual low state photoelectricity value, abscissa time point corresponding to intersection point
At the time of liquid level as to be measured passes through photoelectricity acquisition module.
2. liquid-level detecting method as claimed in claim 1, it is characterised in that preset algorithm is movement in described step S3.1
Variance method.
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| CN104697607A (en) * | 2015-02-06 | 2015-06-10 | 太仓天衡电子科技有限公司 | Non-contact type digital liquid level detection instrument and working method thereof |
| TWI590196B (en) * | 2016-06-06 | 2017-07-01 | 財團法人成大水利海洋研究發展文教基金會 | Method for detecting of liquid |
| CN112161681A (en) * | 2020-11-16 | 2021-01-01 | 山东秉恬信息科技有限公司 | Dynamic metering method of ultrasonic metering instrument |
| CN115326165B (en) * | 2022-10-12 | 2023-01-24 | 山东特联信息科技有限公司 | Tank car remote monitoring system |
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| CN101241021A (en) * | 2008-03-21 | 2008-08-13 | 中国石化扬子石油化工有限公司 | Horizontal type agitated bed reactor material volume detection method |
| CN101614554A (en) * | 2009-07-08 | 2009-12-30 | 保定市三川电气有限责任公司 | Continuous physical measuring device and method |
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