CN107561157A - Water quality testing meter and its method - Google Patents
Water quality testing meter and its method Download PDFInfo
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- CN107561157A CN107561157A CN201610507308.4A CN201610507308A CN107561157A CN 107561157 A CN107561157 A CN 107561157A CN 201610507308 A CN201610507308 A CN 201610507308A CN 107561157 A CN107561157 A CN 107561157A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Abstract
The present invention provides a kind of water quality testing meter and its method, including transmitting transducer, is inputted for the ultrasonic signal according to caused by driving voltage to detection cell；Receive transducer, the ultrasonic signal of wave distortion is produced for non-homogeneous water-medium in acquisition testing pond, and ultrasonic signal includes each harmonic signal；Filtration module, for filtering out baseband noise and high-order harmonic wave in harmonic signal, obtain two, harmonic signal；Controller, for carrying out analog-to-digital conversion to two, harmonic signal, and calculate voltage amplitude value corresponding to two, harmonic signal respectively in preset time, and according to their voltage amplitude value respectively the driving voltage range value of corresponding transmitting transducer square, three cubed ratio detect water quality condition；Display, for showing the water quality condition of detection cell.The relatively other ultrasonic wave water quality detection modes of the present invention, reduce because of the water quality detection precision caused by cavitation phenomenon and efficiency decline the problem of, used suitable for vast family.
Description
Technical field
The present invention relates to ultrasonic measurement technical field, more particularly to a kind of water quality testing meter and its method.
Background technology
The water quality of Drinking Water greatly affects daily life and health, each for safe drinking water, the world
Government of state and scientists are greatly paid close attention to.However, with expanding economy, the increase of population, many regional waters
Shortage, some drinking water sources are seriously polluted, and resident living drinking water safety is on the hazard.In order to ensure the safety of drinking water,
The Ministry of Public Health and national standardization administration committee were to issue in 1985《Standards for drinking water quality》(GB5749-85) enter
Revision is gone, the new mandatory country of joint issue《Standards for drinking water quality》(GB5749-2006).Although so protect
The drinking water safety of production has been demonstrate,proved, but because the pollution of drinking water is also possible to during resulting from the transmission of water, storage and use,
Water quality may be all set to produce pollution, particularly many cities use secondary water-supply, make the big increase of water pollution chance.In order to ensure to use
Water security, easily carrying out detection to water quality in using terminal is highly desirable.
The polluter of drinking water is a lot, is divided into by substance classes：Organic/inorganic substance pollution, Organic Pollution, germ contamination
And radioactive pollution.In order to ensure safe drinking water, it is necessary to being detected to the content of all these materials, the side detected at present
Method mainly determines content by the chemical reaction of material and material, in order to differentiate different chemical substances, it is necessary to using not
With chemical analysis, more than the chemical reaction being related to due to this method, it is necessary to reagent type it is a lot, operating method is complicated,
Apply in general to industrial detection.In order to carry out quick, easy analysis to water quality, after people dissolve in polluter according to drinking water
The change of physical property, quickly to detect the pollution condition of drinking water.Most simple effective method is dissolved according to pollutant
It is insufficient, formed in water after suspending, the light incided in water is produced into scattering, so that the water capacity is also easy to produce muddiness, according to water
Turbidity detect the pollution condition of water, still, when polluter dissolubility is fine, or material grainses very little, light dissipate
Very little is penetrated, turbidity varies less, it is difficult to the pollution condition of water is determined with turbidity, in addition, turbidity is shone with background
Obviously condition is very big so that this method can only do preliminary judgement.
Another method is conductivity detection method, after being dissolved in water due to many polluters, can make conductive ion in water
Quantity changes, and so as to cause the change of the easy electrical conductivity of the water capacity, therefore, measures the pollution that electrical conductivity in water is assured that water
The factors such as situation, the electrical conductivity of solution and the polarization phenomena on its temperature, electrode, distribution of electrodes electric capacity are relevant so that electrical conductivity
Test biconditional operation process and environment it is very sensitive, it is difficult to widely used in family.
It is also a kind of to detect water pollution using change in physical, for example, the molten quantity measuring method of oxygen, when pollutant is dissolved in water
Afterwards, it will inevitably make gas content increase in water, the pollution condition of water determined by the oxygen meltage detected in water.Mesh
Before, although there is the molten amount water quality testing meter of many oxygen, in general chemical measurement method is not suitable for easy survey due to operating difficulties
Amount.Existing simple measurement method is dissolved oxygen electrode, and galvanometry determines according to molecular oxygen through the diffusion rate of film
The content of oxygen in water, the measuring speed of galvanometry is very fast, easy to operate, and interference is few, being capable of scene automatically continuously inspection
Survey, but the oxygen permeation membrane and electrode due to it are easier aging, when containing the things such as algae, sulfide, carbonate, oils in water sample
During matter, can make oxygen permeation membrane block or damage, it is necessary to pay attention to protection and in time change, and due to it by electrode in itself in oxygen
Effect is lower to occur redox reaction to determine the characteristic of oxygen concentration, needs to consume oxygen in continuous mode, so measuring
Sample will be continuously agitated in journey, and general speed is at least required as 0.3m/s, and need to regularly replace electrolyte, cause its survey
Accuracy of measurement and response time are all limited by spreading factor.Above mentioned problem causes this method to be difficult to promote the use of in the family.
In order to which easy, quick detection drinking water pollution situation is, it is necessary to using new method come the pollution condition of drinking water.
Because material is dissolved in water, the acoustic properties of water, such as velocity of sound, absorption coefficient, scattering coefficient can be changed, therefore,
A long time ago, people just determine content of the material in water by detecting these parameters.But as long as the material amount of dissolving in not
Greatly, these acoustic properties of water change very little so that these methods are only used for the unusual serious situation of pollution, and such case
Other simple detection methods are easily to be replaced.
However, more using polluter, the characteristics of gas content is bigger in water, can also be examined with cavitation effect
Survey.When the larger ultrasonic wave of intensity is in water, vibration of the ultrasonic wave in water gradually increases the minute bubbles made in water, finally sends out
Raw rupture, and the bubble ruptured will launch ultrasonic wave, this phenomenon is referred to as cavitation phenomenon.By detecting caused by cavitation effect
Ultrasonic transducer output ultrasonic acoustic pressure threshold value, in principle can air content in water is assessed, so as to judge water
Pollution condition.But due to cavitation threshold not only with environment temperature, substance classes, away from transducer distance etc. several factors it is relevant, and
And it is relevant with the initial size of cavitation bubble, and the cavitation bubble size in water is not certain, but by certain distribution function in several
Rate is distributed, and therefore, cavitation threshold is actually not the amount of a determination, and therefore, the cavitation threshold using cavitation phenomenon measurement is actual
It is the receiving sensitivity of cavitation signal, profit is difficult to the pollution condition for determining water in this way.
The content of the invention
In view of the above the shortcomings that prior art, it is an object of the invention to provide a kind of water quality testing meter and its side
Method, it is inconvenient for operation not high with accuracy of detection for solving water quality testing meter in the prior art, it can not be generalized to what family used
Problem.
In order to achieve the above objects and other related objects, the present invention provides a kind of water quality testing meter, the water quality testing meter
Including detection cell, transmitting transducer, receive transducer, controller, filter circuit and display；
The transmitting transducer, inputted for the ultrasonic signal according to caused by driving voltage to detection cell；
The receive transducer, the ultrasonic wave letter of wave distortion is produced for gathering non-homogeneous water-medium in the detection cell
Number, wherein, the ultrasonic signal includes each harmonic signal；
The filtration module, it is arranged between the receive transducer and the controller, for filtering out each harmonic letter
Baseband noise and high-order harmonic wave in number, obtain two, third harmonic voltage signal；
The controller, for carrying out analog-to-digital conversion to described two, third harmonic voltage signal, and divide in preset time
Not Ji Suan two, voltage amplitude value corresponding to third harmonic voltage signal, and distinguished according to the voltage amplitude value of two, triple-frequency harmonics
The driving voltage range value of corresponding transmitting transducer square, cube ratio detect water quality condition；
The display, the output end of the controller is connected to, for showing the water quality condition of detection cell.
Another object of the present invention is to provide a kind of method of water quality detection, including：
Water to be measured is passed through in detection cell；
Under driving voltage, launch in ultrasonic signal to detection cell；
Non-homogeneous water-medium produces the ultrasonic signal of wave distortion, the ultrasonic wave in receive transducer acquisition testing pond
Signal includes each harmonic signal；
Baseband noise and high-order harmonic wave in each harmonic signal are filtered out, obtains two, third harmonic voltage signal；
Analog-to-digital conversion is carried out to described two, third harmonic voltage signal, calculates analog-to-digital conversion respectively in preset time
Two, voltage amplitude value corresponding to harmonic signal, corresponding hair is distinguished according to the voltage amplitude value of two, triple-frequency harmonics
Penetrate the driving voltage range value of transducer square, cube ratio detect that water quality condition detects water quality condition；
Show water quality condition in the detection cell.
As described above, the water quality testing meter and its method of the present invention, have the advantages that：
By producing the ultrasonic signal of wave distortion, the ultrasonic signal bag under uneven water environment in acquisition testing pond
Signal containing each harmonic, second harmonic and triple-frequency harmonics in each harmonic signal are extracted in ultrasonic signal, is calculated respectively secondary
The voltage amplitude value of harmonic wave and triple-frequency harmonics, according to the flat of the driving voltage range value of its voltage amplitude value and transmitting transducer
Side, cube ratio result, the situation of water quality is detected with reference to default threshold range.Provide a kind of water simple to operation
Quality detection instrument and method, meanwhile, relative to other ultrasonic wave water quality detection modes, reduce the water quality caused by cavitation phenomenon and examine
The problem of surveying precision and efficiency decline, and cost is cheap, is used suitable for vast family.
Brief description of the drawings
Fig. 1 is shown as the structured flowchart of the water quality testing meter of the present invention；
Fig. 2-a, Fig. 2-b are respectively indicated as the oscillogram of transmitting transducer ultrasonic wave in the water quality testing meter of the present invention；
Fig. 2-c, Fig. 2-d be respectively indicated as the present invention water quality testing meter in transmitting transducer ultrasonic wave continuous wave distortion figure,
Impulse wave distortion figure；
Fig. 3 is shown as the complete structure block diagram of the water quality testing meter of the present invention；
Fig. 4 is shown as the method flow diagram of the water quality detection of the present invention；
Fig. 5 is shown as the detail flowchart of step S5 in the method for the water quality detection of the present invention.
Component label instructions：
1 detection cell
2 transmitting transducers
3 receive transducers
4 filtration modules
5 controllers
6 displays
7 amplifying circuits
41 converter units
42 bandpass filters
51 AD conversion units
52 computing units
53 detection units
S1~S6 steps 1~step 6
Embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages and effect of the present invention easily.
Fig. 1 is referred to Fig. 5.It should be clear that structure, ratio, size depicted in this specification institute accompanying drawings etc., only to
Coordinate the content disclosed in specification, so that those skilled in the art understands and reads, being not limited to the present invention can be real
The qualifications applied, therefore do not have technical essential meaning, the tune of the modification of any structure, the change of proportionate relationship or size
It is whole, in the case where not influenceing the effect of present invention can be generated and the purpose that can reach, all should still fall in disclosed skill
Art content is obtained in the range of covering.Meanwhile in this specification it is cited as " on ", " under ", "left", "right", " centre " and
The term of " one " etc., understanding for narration is merely convenient to, and is not used to limit the enforceable scope of the present invention, its relativeness
It is altered or modified, in the case where changing technology contents without essence, when being also considered as the enforceable category of the present invention.
Embodiment 1
Referring to Fig. 1, providing a kind of structured flowchart of water quality testing meter for the present invention, the water quality testing meter includes detection
Pond 1, transmitting transducer 2, receive transducer 3, controller 5, filter circuit and display 6；
The transmitting transducer 2, inputted for the ultrasonic signal according to caused by driving voltage to detection cell 1；
Wherein, a part for the detection cell 1 and water quality testing meter, it is used to fill water to be measured, the transmitting transducing
Device 2 produces ultrasonic signal and inputted to detection cell 1, and its working frequency is 0.5~20MHZ；The ultrasonic signal of transmitting according to
Whether it is single-frequency, can be divided into continuation mode or pulse mode, as shown in Fig. 2 being continuation mode in 2-a, 2-b is arteries and veins
Mode is rushed, 2-c is continuous wave distortion figure, and 2-d is impulse wave distortion figure.Impulse wave and continuous wave can be carried because of inhomogeneities
Caused nonlinear characteristic information, simply the range value of their own harmonic wave is variant, so as to cause follow-up threshold parameter
Setting can be different.
The receive transducer 3, the ultrasonic wave of wave distortion is produced for gathering non-homogeneous water-medium in the detection cell
Signal, wherein, the ultrasonic signal includes each harmonic signal；
Wherein, the transmitting transducer 2 is mountable in detection cell 1 or is installed on the outer of detection cell 1 with receive transducer 3
Portion, and transmitting transducer 2 both can also pass through reflection mode with receive transducer 3 by transmission mode.For example, ought be
During depending on mode, transmitting transducer 2 and receive transducer 3 are in same straight line, when for reflection mode when, receive transducer 3 passes through
Certain angle reflection collection ultrasonic signal.
In addition, the receive transducer 3 is preferably to go out in second harmonic or triple-frequency harmonics with the common of higher sensitivity
Transducer is formed.
The filtration module 4, it is arranged between the receive transducer 3 and the controller 5, for filtering out ultrasonic wave letter
Baseband noise and high-order harmonic wave in number in each harmonic signal, obtain two, third harmonic voltage signal；
The controller 5, for carrying out analog-to-digital conversion to described two, third harmonic voltage signal, and in preset time
Calculate two, voltage amplitude value corresponding to harmonic signal respectively, and according to the voltage amplitude value of two, triple-frequency harmonics respectively with
The driving voltage range value of its corresponding transmitting transducer square, the ratio of quadratic power detect water quality condition；
Wherein, the controller 5 is central processing unit, microprocessor, digital signal processor or PLD
In any one.
The display 6, the output end of the controller 5 is connected to, for showing the water quality condition of detection cell 1.
Wherein, display 6 can be liquid crystal display or LED display, as long as can show the result of the water quality condition of detection
Watched to user.
It is of the invention by filling water to be detected in detection cell 1 in the present embodiment, wherein, water to be detected is preferably
Running water, the harmonic signal of ultrasonic wave is gathered, extract second harmonic and triple-frequency harmonics in harmonic signal, calculate second harmonic respectively
With the voltage amplitude value of triple-frequency harmonics, according to the driving voltage range value of its voltage amplitude value and transmitting transducer square, two
The ratio result of power, the situation of water quality is detected with reference to default threshold range.Provide a kind of water quality simple to operation
Detector and method, meanwhile, relative to other ultrasonic wave water quality detection modes, reduce the water quality detection caused by cavitation phenomenon
The problem of precision and efficiency decline, and cost is cheap, is used suitable for vast family.
Cleaning Principle：
In the Hooke's law of reactive material Deformation Law, the higher order term of modulus of elasticity be present, when ultrasonic signal is at this
After propagating certain distance in kind homogeneous substance, nonlinear effect will be produced, this nonlinear effect is referred to as classical non-linear effect
Should, when ultrasound intensity is smaller, this nonlinear effect is general very weak.But if material is heterogeneous, particularly work as
When the modulus of elasticity of non-homogeneity and the elasticity of surrounding medium differ greatly, under very low ultrasound intensity, ultrasonic wave
Propagated in this material and would indicate that the nonlinear effect more much better than than homogeneous substance, the size of this material nonlinear factor
It can be used for characterizing material microstructure.At present people by measurement of species using process nonlinear factor, non-destructive
Assessment strength member life-span.
Micro- gas core cavitation bubble that ultrasonic cavitation refers to be present in liquid vibrates in the presence of sound wave, when acoustic pressure reaches
The growth occurred during certain value and the dynamic process of collapse.
And the pollution course of water, it is exactly the process that polluter is dissolved in water, when material is dissolved in water, pollutant's Interfacial Adsorption
Water will be soluble in water together, very small air pocket will be formed between pollutant and water, due to this air pocket very little, and
The deformation modulus of water and pollutant is much bigger typically compared with air so that the deformation very little in compression, but in relaxed phases, by
It is easy in gas deformation, larger deformation can be produced, waveform at this moment will become asymmetric, will show stronger homogeneous humorous
Ripple.Under identical excitation, pollution is stronger, and non-homogeneity is more, and the pollution of formation is bigger, and the air pocket in water is more, is formed
Odd harmonic it is stronger (triple-frequency harmonics).However, the species of the pollutant in water is very more, property is also extremely complex, and second order
The size of harmonic wave is non-linear relevant with non-uniform material in itself, therefore, in order to characterize the pollution condition of material in water, it is necessary to will
Second harmonic is taken into consideration with triple-frequency harmonics, according to the voltage amplitude value of second harmonic and triple-frequency harmonics respectively with threshold range
Compare, determine the situation of water quality.
Embodiment 2
As shown in figure 3, the complete structure block diagram of the water quality testing meter for the present invention；Specifically include：
Amplifying circuit 7, it is arranged between the controller 5 and transmitting transducer 2, for what is sent according to controller 5
Control signal produces driving voltage, to drive transmitting transducer 2 to work, produces corresponding ultrasonic signal.The amplifying circuit 7
It is preferred that the model PGA202 amplifiers of the BURR-BROWN companies production used, PGA202 is a kind of programme-controlled instrument amplifier,
It has been internally integrated program control gain and has changed logic circuit.Due to eliminating gain control section, instrument is built using PGA202
Amplifier can make circuit structure obtain very big simplification, and its multiplication factor is stablized accurate, is follow-up data processing
Provide conveniently.
The filtration module 4 includes converter unit 41 and bandpass filter 42, the converter unit 41, for humorous to each time
Ripple signal carries out wavelet transformation and fast Fourier transform to obtain the fundamental frequency of the harmonic signal, wherein, the work of wavelet transformation
With to filter out the Hz noise and low-frequency disturbance in harmonic signal, i.e. random noise；And the fundamental wave of harmonic signal is in frequency domain amplitude
Value is high easily distinguishable, therefore to carrying out fast Fourier transform by the signal of wavelet transformation, to determine the fundamental wave of harmonic signal frequency
Rate；The bandpass filter 42 includes second harmonic band-pass filter 42 and triple-frequency harmonics bandpass filter 42, and second harmonic
Frequency with triple-frequency harmonics is depending on the fundamental frequency of transmitting transducer 2.When knowing its fundamental frequency, can be correspondingly arranged
The frequency of second harmonic band-pass filter 42 and triple-frequency harmonics bandpass filter 42, reduces the influence of rd harmonic signal.
The controller 5 comprises at least following three unit：
The AD conversion unit 51, turn for carrying out modulus to second harmonic signal, third harmonic voltage signal respectively
Change, second harmonic data signal, triple-frequency harmonics data signal corresponding to generation；The AD conversion unit 51 can turn for modulus
Parallel operation.
The computing unit 52, it is secondary corresponding to two, triple-frequency harmonics data signal for being calculated respectively in preset time
Harmonic voltage range value and third harmonic voltage range value；
, it is necessary to preset C1, C2 threshold value according to water standard before water quality testing meter measurement, in preset time, when
C1, C2 then think that its is seriously polluted when exceeding some threshold value, think its intermediate pollution etc. higher than certain threshold value less than some threshold value.Its
In, preset time is time cycle of the user from setting, it is generally preferable to is 2 seconds.
The detection unit 53, for the excitation electricity according to the corresponding transmitting transducer of second harmonic voltage amplitude value
The driving voltage range value three of the corresponding transmitting transducer of the ratio and third harmonic voltage range value of pressure amplitude angle value square
The ratio of power, the ratio result of measurement and predetermined threshold value are relatively detected to the situation of water quality in detection cell,
C1=A2X/V2 (1)
C2=A3X/V3 (2)
In formula (1) and formula (2), V be transmitting transducer driving voltage range value, A2xFor second harmonic voltage amplitude value,
A3xFor third harmonic voltage range value, C1, C2 are respectively secondary, the excitation electricity of third harmonic voltage range value and transmitting transducer
Pressure amplitude angle value square, cube ratio.
It is for example, each electric with the excitation of corresponding transmitting transducer according to second harmonic and the voltage amplitude value of triple-frequency harmonics
The ratio of pressure, by default C1, C2 threshold range, threshold value is distributed in staged, can by water quality quality degree, e.g., " good ",
The degree such as " safety ", " careful ", " danger " is divided, and when it all exceedes its corresponding highest threshold value respectively, then water quality shows
" danger " is shown as, is then shown as when it is below lowest threshold " good ", is detected during the threshold range fallen into according to C1, C2
Water quality condition.
In this example, when user uses the system detectio water quality condition, only water need to be loaded detection cell 1, starts detection
System can obtain corresponding water quality detection result, halfway without any operation, simple and convenient；Meanwhile believed by detecting harmonic wave
Examination criteria number as water quality quality degree, compared to the detector of other utilization ultrasound examination water quality, is reduced because of empty verbiage
The problem of phenomenon precision and efficiency of detecting declines；It is clear preferably with distilled water when user will carry out repeated detection different quality
Detection cell 1 is washed, in order to avoid influence accuracy of detection.
Embodiment 3
As shown in figure 4, the method flow diagram of the water quality detection for the present invention, including：
Step S1, water to be measured is passed through in detection cell；
Specifically, water to be measured is preferably running water；
Step S2, under driving voltage, launch in ultrasonic signal to detection cell；
Specifically, send a control signal to amplifying circuit and produce driving voltage, it is super to drive transmitting transducer work to produce
Acoustic signals；
Step S3, non-homogeneous water-medium produces the ultrasonic signal of wave distortion, institute in receive transducer acquisition testing pond
State ultrasonic signal and include each harmonic signal；
Specifically, the ultrasonic signal of receive transducer collection include each harmonic signal by wave distortion, as base is secondary,
Secondary, three inferior harmonic signals；
Step S4, baseband noise and high-order harmonic wave in each harmonic signal are filtered out in ultrasonic signal, obtain two, be humorous three times
Wave voltage signal；
Wherein, wavelet transformation and fast Fourier transform are carried out to harmonic signal, to obtain the fundamental frequency of the harmonic signal,
Second harmonic band-pass filter and triple-frequency harmonics bandpass filter are respectively adopted according to fundamental frequency, obtain corresponding to two, three times
Harmonic voltage signal.
Step S5, analog-to-digital conversion is carried out to described two, third harmonic voltage signal, calculates mould respectively in preset time
Voltage amplitude value corresponding to change two, harmonic signal is counted, it is right with it respectively according to the voltage amplitude value of two, triple-frequency harmonics
The driving voltage range value for the transmitting transducer answered square, cube ratio detect water quality condition；
Step S6, show water quality condition in the detection cell.
As shown in figure 5, in water quality detection method step S5 detail flowchart, including：
Step S501, analog-to-digital conversion is carried out to second harmonic signal, third harmonic voltage signal respectively, two corresponding to generation
Subharmonic data signal, triple-frequency harmonics data signal；
Step S502, calculate second harmonic voltage amplitude corresponding to two, triple-frequency harmonics data signal respectively in preset time
Angle value and third harmonic voltage range value；
Step S503, put down according to the driving voltage range value of the corresponding transmitting transducer of second harmonic voltage amplitude value
The three cubed ratio of driving voltage range value of the corresponding transmitting transducer of square ratio and third harmonic voltage range value,
Measure ratio result and predetermined threshold value are relatively detected to the situation of water quality in detection cell.
Wherein, the voltage amplitude value for calculating two, triple-frequency harmonics as follows distinguishes corresponding transmitting transducer
Driving voltage range value square, cube ratio：
C1=A2X/V2 (1)
C2=A3X/V3 (2)
In formula (1) and formula (2), V is the driving voltage range value of transmitting transducer, A2xFor second harmonic voltage magnitude, A3x
For third harmonic voltage amplitude, C1, C2 are respectively secondary, the driving voltage width of third harmonic voltage range value and transmitting transducer
Angle value square, cube ratio.
In summary, the present invention is by gathering the harmonic signal of ultrasonic wave, extract in harmonic signal second harmonic with three times
Harmonic wave, calculate respectively the voltage amplitude value of second harmonic and triple-frequency harmonics and the driving voltage of transmitting transducer square, three times
The ratio of side, the situation of water quality is detected according to ratio result.A kind of water quality testing meter simple to operation and method are provided,
Meanwhile relative to other ultrasonic wave water quality detection modes, avoid because under water quality detection precision and efficiency caused by cavitation phenomenon
The problem of drop, and cost is cheap, is used suitable for vast family.So the present invention effectively overcome it is of the prior art it is a variety of lack
Put and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (10)
1. a kind of water quality testing meter, it is characterised in that the water quality testing meter includes detection cell, transmitting transducer, receives transducing
Device, controller, filter circuit and display；
The transmitting transducer, inputted for the ultrasonic signal according to caused by driving voltage to detection cell；
The receive transducer, the ultrasonic signal of wave distortion is produced for gathering non-homogeneous water-medium in the detection cell,
Wherein, the ultrasonic signal includes each harmonic signal；
The filtration module, it is arranged between the receive transducer and the controller, for filtering out in each harmonic signal
Baseband noise and high-order harmonic wave, obtain two, third harmonic voltage signal；
The controller, for carrying out analog-to-digital conversion to described two, third harmonic voltage signal, and counted respectively in preset time
Calculate two, voltage amplitude value corresponding to third harmonic voltage signal, and according to the voltage amplitude value of two, triple-frequency harmonics respectively with hair
Penetrate the driving voltage range value square of transducer, three cubed ratio detects water quality condition；
The display, the output end of the controller is connected to, for showing the water quality condition of detection cell.
2. water quality testing meter according to claim 1, it is characterised in that the filtration module includes converter unit and band logical
Wave filter, the converter unit, for carrying out wavelet transformation and fast Fourier transform to each harmonic signal to obtain the harmonic wave
The fundamental frequency of signal, the bandpass filter include second harmonic band-pass filter and triple-frequency harmonics bandpass filter, and two
The frequency of subharmonic and triple-frequency harmonics is depending on the fundamental frequency of transmitting transducer.
3. water quality testing meter according to claim 1, it is characterised in that the controller also include AD conversion unit,
Computing unit and detection unit；
The AD conversion unit, for carrying out analog-to-digital conversion to second harmonic voltage signal, third harmonic voltage signal respectively,
Second harmonic data signal, triple-frequency harmonics data signal corresponding to generation；
The computing unit, for calculating second harmonic electricity corresponding to two, triple-frequency harmonics data signal respectively in preset time
Pressure amplitude angle value and third harmonic voltage range value；
The detection unit, for square according to second harmonic voltage amplitude value and the driving voltage range value of transmitting transducer
The cube ratio of the driving voltage range value of ratio and third harmonic voltage range value and transmitting transducer, by the respective of measurement
Ratio relatively detects the situation of water quality in detection cell with predetermined threshold value.
4. water quality testing meter according to claim 3, it is characterised in that the detection unit is calculated as follows two,
The voltage amplitude value of triple-frequency harmonics distinguish the driving voltage range value of corresponding transmitting transducer square, three cubed ratio
Value：
C1=A2X/V2 (1)
C2=A3X/V3 (2)
In formula (1) and formula (2), V is the driving voltage range value of transmitting transducer, A2xFor second harmonic voltage amplitude value, A3xFor
Third harmonic voltage range value, C1, C2 are respectively secondary, the driving voltage width of third harmonic voltage range value and transmitting transducer
Angle value square, cube ratio.
5. water quality testing meter according to claim 1, it is characterised in that also including amplifying circuit, it is arranged at the control
Between device and transmitting transducer processed, the control signal for being sent according to controller produces driving voltage, to drive transmitting transducing
Device works.
A kind of 6. method of water quality detection, it is characterised in that including：
Water to be measured is passed through in detection cell；
Under driving voltage, launch in ultrasonic signal to detection cell；
Non-homogeneous water-medium produces the ultrasonic signal of wave distortion, the ultrasonic signal in receive transducer acquisition testing pond
Include each harmonic signal；
Baseband noise and high-order harmonic wave in each harmonic signal are filtered out in ultrasonic signal, obtains two, third harmonic voltage signal；
To described two, third harmonic voltage signal carry out analog-to-digital conversion, calculated respectively in preset time analog-to-digital conversion two,
Voltage amplitude value corresponding to harmonic signal, according to the voltage amplitude value of two, triple-frequency harmonics, corresponding transmitting is changed respectively
Can device driving voltage range value square, three cubed ratio detect water quality condition；
Show water quality condition in the detection cell.
7. the method for water quality detection according to claim 6, it is characterised in that it is described filter out in ultrasonic signal each time it is humorous
Baseband noise and high-order harmonic wave in ripple signal, the step of obtaining two, third harmonic voltage signal, including：
Wavelet transformation and fast Fourier transform are carried out to each harmonic signal in ultrasonic signal, to obtain the base of the harmonic signal
Wave frequency rate, second harmonic band-pass filter and triple-frequency harmonics bandpass filter is respectively adopted, obtains corresponding two, triple-frequency harmonics electricity
Press signal.
8. the method for water quality detection according to claim 6, it is characterised in that described to described two, third harmonic voltage
Signal carries out analog-to-digital conversion, calculates the two of analog-to-digital conversion, voltage amplitude corresponding to harmonic signal respectively in preset time
Angle value, according to the voltage amplitude value of two, triple-frequency harmonics distinguish corresponding driving voltage range value square, cube ratio
The step of detecting water quality condition, including：
Analog-to-digital conversion is carried out to second harmonic signal, third harmonic voltage signal respectively, second harmonic numeral letter corresponding to generation
Number, triple-frequency harmonics data signal；
Calculate second harmonic voltage amplitude value and triple-frequency harmonics corresponding to two, triple-frequency harmonics data signal respectively in preset time
Voltage amplitude value；
According to the ratio and third harmonic voltage width of the corresponding driving voltage range value square of second harmonic voltage amplitude value
The corresponding three cubed ratio of driving voltage range value of angle value, the ratio result of measurement is relatively detected with predetermined threshold value
The situation of water quality in detection cell.
9. the method for water quality detection according to claim 8, it is characterised in that described according to second harmonic voltage amplitude value
The ratio and third harmonic voltage range value of the driving voltage range value square of corresponding transmitting transducer are corresponding
The step of driving voltage range value of transmitting transducer three cubed ratio, including：
The voltage amplitude value for calculating two, triple-frequency harmonics as follows distinguishes the driving voltage width of corresponding transmitting transducer
Angle value square, cube ratio：
C1=A2X/V2 (1)
C2=A3X/V3 (2)
In formula (1) and formula (2), V is the driving voltage range value of transmitting transducer, A2xFor second harmonic voltage magnitude, A3xFor three
Subharmonic voltage amplitude, C1, C2 are respectively secondary, the driving voltage range value of third harmonic voltage range value and transmitting transducer
Square, three cubed ratio.
10. the method for water quality detection according to claim 6, it is characterised in that described under driving voltage, transmitting ultrasound
Step in ripple signal to detection cell, including：Send a control signal to amplifying circuit and produce driving voltage, to drive transmitting transducing
Device works.
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| CN110146595A (en) * | 2019-04-23 | 2019-08-20 | 宁波水表股份有限公司 | Water turbidity degree measurement method based on ultrasound |
| CN112414906A (en) * | 2020-10-22 | 2021-02-26 | 北京北方华创微电子装备有限公司 | Detection device for concentration of particulate matter in liquid medicine and liquid change control method |
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| CN108303357A (en) * | 2018-01-29 | 2018-07-20 | 杭州开闳环境科技有限公司 | Suspended load measuring system and signal processing method based on multifrequency underwater sound signal |
| CN110146595A (en) * | 2019-04-23 | 2019-08-20 | 宁波水表股份有限公司 | Water turbidity degree measurement method based on ultrasound |
| CN110146595B (en) * | 2019-04-23 | 2023-07-14 | 宁波水表股份有限公司 | Water turbidity measuring method based on ultrasonic waves |
| CN112414906A (en) * | 2020-10-22 | 2021-02-26 | 北京北方华创微电子装备有限公司 | Detection device for concentration of particulate matter in liquid medicine and liquid change control method |
| CN112414906B (en) * | 2020-10-22 | 2023-02-14 | 北京北方华创微电子装备有限公司 | Detection device for concentration of particulate matter in liquid medicine and liquid change control method |
| CN114384155A (en) * | 2022-01-12 | 2022-04-22 | 重庆医科大学 | Measuring system and method for measuring sound velocity of medium in waveguide |
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