CN108761209A - A kind of liquid electric conductivity measurement method and device - Google Patents
A kind of liquid electric conductivity measurement method and device Download PDFInfo
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- CN108761209A CN108761209A CN201810799556.XA CN201810799556A CN108761209A CN 108761209 A CN108761209 A CN 108761209A CN 201810799556 A CN201810799556 A CN 201810799556A CN 108761209 A CN108761209 A CN 108761209A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/22—Measuring resistance of fluids
Abstract
The present invention provides a kind of liquid electric conductivity measurement method and device, the method includes：The sine wave exciting signal with different frequency is sent to electrode A 310；The coupled signal with different frequency is received from electrode B 311；Calculate the corresponding voltage value of coupled signal of different frequency；Conductivity is calculated using the corresponding voltage value of the coupled signal of different frequency.Overcome that conductivity measurement electrode existing for existing conductance measurement technology is perishable, conductivity measurement precision is influenced by electrode surface deposit and temperature measurement increases at least one of watertight structure complexity these disadvantages.It is at low cost, there is practicability.
Description
Technical field
The present invention relates to field of environment protection more particularly to a kind of liquid electric conductivity measurement method and devices.
Background technology
Monitoring water quality on line system is detected water quality using line analysis instrument and laboratory analytical instrument, passes through acquisition
The sample of representative, promptness and reliability realizes the online auto monitoring to sample.Automatic monitoring system generally comprises
Sampling system, pretreatment system, acquisition and control system, on-line monitoring analysis meter, data processing and Transmission system and
Remote data management center, these subsystems not only each architectonical, but also cooperate, to complete entire online auto monitoring system
Continuously reliably run.
Since nineteen ninety-eight, China has successively built up 100 national surface water in seven big water-based 10 major river valleys
It is automatic also to establish a local level surface water quality more than 400 according to environmental management needs successively for Water Automatic Monitoring System, each place
Monitoring station realizes automatic water quality monitoring weekly.Current water quality automatic monitoring device has been unable to meet quick hair in manufacture
The needs of the water quality monitoring of exhibition, therefore, production domesticization automonitor have wide development prospect and potential selling market.
Multi-parameter water quality online auto monitoring system is suitable for：Water head site monitoring, environmental monitoring station, municipal administration are water-treated
Journey, city planting ductwork Water quality surveillance, village tap water monitoring；Recirculated cooling water, swimming-pool water operational management, industrial water source cycle profit
With fields such as, industrialized aquicultures.
The software architecture of monitoring water quality on line system can extend hundreds of monitoring node, and each node can configure
Multiple sensors.According to practical operation situation, test water quality parameter can be increased, such as：User can select by traditional biography
Sensor is come the water conventional parameter that monitors, such as turbidity, conductivity, oxidation-reduction potential, total organic carbon, ammonia nitrogen, COD, various organic
Object, free chlorine, total chlorine, total fluorine, pH value, flow, pressure, temperature etc., meanwhile, it can be according to local water resources condition and past dirt
Dye event, selectivity monitor various chemical pollutants.
Monitoring water quality on line system can rapidly and accurately extract important water quality data, and data are presented on clearly
In reporting format.The report of one standard includes following information：Water conventional index, maximum value, minimum value, average value, system
State.
Water quality online analyzer device is generally divided into two kinds of electrode method and photometry by measurement method.
Dividing water quality online analyzer device by the parameter of measurement has following type：
What the design of water intake system was designed mainly for the representativeness, reliability and continuity for meeting water sample, the master of the system
Component part is wanted to have：Water intake, water pump, water sample conveyance conduit and flow rate adjust several part compositions.According to water intaking side
The division of formula is broadly divided into two kinds of directly taking type and float-type, and directly taking type is used mainly for the small environment of SEA LEVEL VARIATION, such as sewage
Factory, pollution sources, equipment in tap water culvert pipe water intaking etc., and float-type is used mainly for the larger environment of SEA LEVEL VARIATION, such as surface water.
Monitoring water quality on line system pretreatment system is primarily to should eliminate interference instrumental analysis and influence instrument makes
Factor, and the representativeness of water sample cannot be lost.Pretreated means usually have natural subsidence, physical filtering and infiltration etc..
Pretreated rank is typically determined according to the purity of water sample.Some analytical instrument already have accounted for the pre- of sample introduction in design
Processing, need to consider matched use in the system integration.
The control of monitoring water quality on line system data acquisition is mainly by PLC, live industrial personal computer, central station computer and pick-up
The compositions such as device, executing agency, function mainly have：
（1）The automatic running of entire on-line monitoring system is controlled, this part after PLC write-in programs mainly by completing；
（2）The data of instrumental analysis are acquired, store and transmit, this part mainly acquires transmission module by live industrial personal computer and data
Cooperation is completed.
Monitoring water quality on line system integration auxiliary system is mainly to protect the fortune of the continuous-stable of on-line monitoring system
Row, it needs variation according to field condition and adjusts accordingly.There is the following aspects to need to pay attention on the whole：
（1）The cleaning of pipeline：Due to remaining dirt in pipeline and therefore the algae multiplied can pollute water sample, institute
To need to be timed pipeline quantitative cleaning, the mode and content of cleaning are varied, and target is provided to ensure water sample
Authenticity and representativeness.
（2）The guarantee of electric power：The stabilization of electric power is directly related to the accuracy and continuity of instrumental analysis, therefore most first
Stable AC network may be selected for access；Secondly, it before alternating current enters automatic monitoring system, needs to electric current again
Rectification, to cope with the occurrence of sudden electric current is unstable；Finally, if necessary, can be equipped with backup power supply with
The normal operation of on-line monitoring system when for having a power failure.
（3）Lightning proof：Lightning protection is broadly divided into station lightning protection, power lightning protection and communication lightning protection, the electric current when meeting with lightning stroke
Breakdown lightning protection device first is to achieve the purpose that protective meter and system equipment.This point is even more important in the multiple area of thunderstorm,
Staff will check the state of lightning protection device as early as possible after thunderstorm occurs, as damage will be replaced in time.
（4）Adjust humiture：Suitable temperature and humidity is also critically important for the stable operation of instrument, this partial function master
It to be realized by air-conditioning and dehumidification equipment.
Existing electric pole type multi-parameter water quality monitor（For example, DCT-MWQ-5100/5101）Each probe can be freely combined, it is independent
It replaces, plug and play can remote control；Scalability：Multiple factors are monitored simultaneously, 2-12 sensor can be installed；It is a variety of to answer
With：Work online for a long time, fast-field evaluation, emergency monitoring, groundwater monitoring, from charged pool；Solid shell：POM materials are (poly-
Acetaldehyde polymer), anti-seawater corrosion can underwater 200 meters of normal works；It is compact-sized：It is smaller can be mounted on size by diameter 76mm
Occasion.
Five parameter sensors of existing water quality use advanced modularized design and advanced digital communication technology, by general
Controller and sensor form, and pH, dissolved oxygen, conductivity, water temperature and turbidity five can be connected simultaneously on a general purpose controller
Sensor, and can realize Display on the same screen.Ultrasonic cleaning module wherein built in turbidity transducer, it is ensured that the stabilization to work long hours
Property and accuracy.
In patent application field, there is following conductance measurement technology：
Application No. is CN201721555968.6, the utility model of entitled " a kind of conductance instrument ", including conductance
Rate sensor further includes providing the exiting signal generating circuit of driving source, to the defeated of conductivity sensor for conductivity sensor
Go out signal and is amplified the amplification and rectification circuit of shaping, DC converting circuit, analog-to-digital conversion circuit and controller, pumping signal
It includes square wave excitation source and filter circuit, square wave excitation source, filter circuit, conductivity sensor, amplification shaping electricity that circuit, which occurs,
Road, DC converting circuit, analog to digital conversion circuit and controller are sequentially connected, and controller connect with square wave excitation source and is square wave
Driving source provides clock signal, and conductance instrument further includes temperature-compensation circuit, and temperature-compensation circuit passes through analog-to-digital conversion electricity
Road is connect with controller.
Application No. is CN201710270275.0, it is entitled " measuring device of the conductivity Resistivity testing of water and
Method ", device include the measuring circuit being linked in sequence, subtraction circuit, A/D converter circuit, master chip；The measuring circuit with
Master chip connects；Its method includes：Different voltages are loaded by measuring circuit according to the positive pulse square wave excitation from master chip
Electrode both ends make to generate alternate forward and reverse electric current in water and amplify, detection, obtain signal voltage V1, V2；Subtraction circuit will be believed
Number voltage V1, V2 obtain measuring signal Vout after doing subtraction；Measuring signal Vout is AD converted by A/D converter circuit；Master chip
The conductivity or resistivity of water are calculated according to the measuring signal Vout after AD conversion.The present invention is tested using positive pulse square wave excitation
Solution, setting excitation amplifying circuit, making conductance cell, there are both forward and reverse directions electric currents to flow through in positive pulse square wave excitation, to resist pole
Change effect.
It is entitled " a kind of water resource electrical conductivity measurement circuit with temperature-compensating " application No. is CN201611172938.7
In, processor module is connect with driving source circuit signal, excitation source circuit connect with conductivity probe signal, conductivity probe and
Range switch circuit signal connects, and range switch circuit is connect with true effective value converting circuit signal, true effective value converting circuit
It is connect with analog to digital conversion circuit signal, analog to digital conversion circuit is connect with processor die block signal, temperature value probe and signal condition
Circuit signal connects, and signal conditioning circuit is connect with analog to digital conversion circuit signal, power supply module and all other module electricity
Source connects.The present invention have the characteristics that the functions such as auto thermal compensation, range manually adjust, high-precision analog acquires and.
Application No. is CN201610583932.2, entitled " a kind of conductivity measuring method, circuit and conductivity measurement
Instrument " provides a kind of conductivity measuring method, and this method includes：Generate ac square wave signal；Amplify ac square wave signal；It will put
Square-wave signal after big generates an alternating electric field by one end of conducting wire connection electrode in electrolyte solution；Pass through electrode
Other end detection electrolyte solution the faint ac current signal at conductivity meter electrode both ends is resulted from alternating electric field；
Faint ac current signal is transformed into ac voltage signal；Rectification, filtering are carried out to obtain steady dc voltage signal；
D. c. voltage signal is converted to corresponding conductivity to show.
Application No. is CN201520679587.3, the practicality that entitled " a kind of high-precision conductivity measurement system " provides is new
Type discloses a kind of high-precision conductivity measurement system, includes being passed for measuring the four pole type conductivity of liquid medium conductivity
Sensor, test voltage occurs module and is connected with four pole type conductivity sensor, and generates test under the control of control module
Voltage signal is transferred to test pole plate and generates reference voltage signal and is transferred to reference to pole plate；Current sampling module is for sampling
The current signal that four pole type conductivity sensor generates, current signal carry out signal through pre-amplifying module and two level amplification module
Output to control module, control module obtains conductivity value by calculating and passes through display module display data information after amplification.
Using the technical solution of the utility model, automatically switched by multrirange, it is suitable to be chosen according to different test environments
Range ability, while four pole type conductivity sensor is used, test voltage can be automatically adjusted according to reference electrode, realize automatic mend
It repays, to provide measurement accuracy.
Application No. is CN201410828826.7, entitled " a kind of liquid conductivity measurement electrode with micro pump " is given
The liquid conductivity measurement electrode gone out is made of two electrode, that is, first electrodes, second electrode and micro pump；Two electrodes are
First electrode, second electrode are the equal cylindrical straight tube of the unequal height of diameter, and first electrode is the cylindrical straight for having bottom surface
Cylinder, second electrode for no bottom surface cylindrical straight tube；Second electrode is coaxial with first electrode and end face is aligned installation, forms two
A alignment electrode end surface, wherein there is corresponding first electrode that end face of bottom surface to be known as the first alignment electrode end surface, the other end
Face is known as the second alignment electrode end surface, and second electrode surrounds first electrode, and there are uniform between the cylindrical side wall of two electrodes
Gap, first alignment electrode end surface coaxially connects with the water outlet of micro pump.The innovative point of the technical program is to make electricity
Pole surface cannot assemble and adhere to ion and form firm electric double layer, avoid electrode polarization.
Application No. is CN201310560258.2, entitled " method for measuring conductivity and the use using this method
In the system for measuring conductivity " method of measurement conductivity that provides includes：Conductance cell is obtained using conductivity standard solution
Cell constant of conductometric vessel；It will wish in the solution measured injection conductance cell, and predetermined to change by stages in each preset time t
The mode of DC voltage scheduled DC voltage is applied to the electrode being located in conductance cell；According to voltage and peak point current it
Between linear relationship obtain as slope solution resistance, wherein peak point current be directed to each voltage measurement obtained from；
And the conductivity of solution is calculated using the resistance of cell constant of conductometric vessel and solution.
Although existing conductivity measuring device can keep preferable performance in light polluted water region, in heavily contaminated waters, electricity
Pole and sewage are in direct contact for a long time can lead to that conductivity measurement electrode is perishable, conductivity measurement precision is heavy by electrode surface
The shortcomings that product object influences and temperature measurement increases watertight structure complexity.
The present invention provides a kind of liquid electric conductivity measurement method and device, for overcoming existing for existing conductance measurement technology
Conductivity measurement electrode is perishable, conductivity measurement precision is influenced by electrode surface deposit and temperature measurement increases watertight knot
At least one of these disadvantages of structure complexity.
Invention content
The present invention provides a kind of liquid electric conductivity measurement method and device, for overcoming existing for existing conductance measurement technology
Conductivity measurement electrode is perishable, conductivity measurement precision is influenced by electrode surface deposit and temperature measurement increases watertight knot
At least one of these disadvantages of structure complexity.
The present invention provides a kind of liquid electric conductivity measurement method, includes the following steps：
A kind of liquid electric conductivity measurement method, includes the following steps：
Step S110 sends the sine wave exciting signal with different frequency to electrode A 310；
Step S120 receives the coupled signal with different frequency from electrode B 311；
Step S130 calculates the corresponding voltage value of coupled signal of different frequency；
Step S140 calculates conductivity using the corresponding voltage value of the coupled signal of different frequency.
The present invention provides a kind of liquid electric conductivity measuring device, including following module：
Encourage channel module 380, electrode A 310, receiving channel module 390, electrode B 311 and processor 320；Wherein,
Channel module 380 is encouraged, for sending the sine wave exciting signal with different frequency, including excitation to electrode A 310
Signal generator module 330, pumping signal amplification module 331；
Electrode A 310, the sine wave exciting signal for injecting different frequency to liquid 300, including metallic conductor；
Receiving channel module 390, for being taken from coupled signal of the reception of electrode B 311 with different frequency, including coupled signal
Egf block 340, coupled signal amplification module 341, coupled signal peak value hold module 342, A/D sampling modules 343；
Electrode B 311, the coupled signal for detecting liquid 300 to the sine wave exciting signal of different frequency, including metal are led
Body；
Processor 320, the corresponding voltage value of coupled signal for calculating different frequency, and calculate conductance using the voltage value
Rate, including arithmetic element, storage unit and peripheral interface circuit.
The method and device that the embodiment of the present invention provides can overcome conductivity measurement electrode existing for existing conductance measurement technology
Perishable, conductivity measurement precision is influenced by electrode surface deposit and temperature measurement increases watertight structure complexity these are lacked
At least one of point.It is at low cost, there is practicability.
Other features and advantages of the present invention will be illustrated in the following description.
Description of the drawings
Fig. 1 is a kind of liquid electric conductivity measuring method flow chart that the embodiment of the present invention provides；
Fig. 2 is that a kind of liquid electric conductivity that the embodiment of the present invention provides measures schematic equivalent circuit；
Fig. 3 is a kind of liquid electric conductivity measuring device composition schematic diagram that the embodiment of the present invention provides.
Inventive embodiments
The present invention provides a kind of liquid electric conductivity measurement method and device, for overcoming conductance existing for existing conductance measurement technology
Rate measuring electrode is perishable, conductivity measurement precision is influenced by electrode surface deposit and temperature measurement increases watertight structure and answers
At least one of these disadvantages of polygamy.It is at low cost, there is practicability.
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the reality of the present invention
Example is applied to be described in detail.It should be noted that in the absence of conflict, the spy in embodiment and embodiment in the application
Sign mutually can be combined arbitrarily.
Conductivity measurement includes indirect method and direct method, for the disadvantage for overcoming conductivity measurement electrode perishable, this hair
It is bright that conductivity measurement is realized using indirect method.
The conductivity measurement embodiment that the present invention provides measures conductivity using indirect method, in indirect method conductivity measurement,
Electrode surface is covered with insulating layer or insulating trip, is not in direct contact with sewage, but carries out conductivity measurement by insulating protective layer,
Its advantage is that being easily achieved the physical isolation between conductivity measurement electrode and fluid to be measured, electrode is made not connect directly with liquid
It touches, but liquid is implemented by insulating protective layer（Such as, sewage）Conductivity measurement.
Below in conjunction with the accompanying drawings, method for detecting position provided by the invention citing, system citing are illustrated.
Embodiment one, a kind of liquid electric conductivity measurement method citing
Shown in Figure 1, a kind of liquid electric conductivity measurement method embodiment provided by the invention includes the following steps：
Step S110 sends the sine wave exciting signal with different frequency to electrode A 310；
Step S120 receives the coupled signal with different frequency from electrode B 311；
Step S130 calculates the corresponding voltage value of coupled signal of different frequency；
Step S140 calculates conductivity using the corresponding voltage value of the coupled signal of different frequency.
The method that the present embodiment provides, wherein
It is described to send the sine wave exciting signal with different frequency to electrode A 310, including：
Processor 320 controls pumping signal generation module 330 and generates the sine wave signal with the first, second, and third frequency,
The sine wave signal of first, second, and third frequency is sent to electrode A 310, electrode A by pumping signal amplification module 331
310 inject received sine wave signal to liquid 300.
Specifically, pumping signal generation module 330 includes DDS（Direct Digital Synthesizer；Direct Digital
Synthesizer）Submodule, DDS submodules generate the sine wave signal of the first, second, and third frequency, the first, second, and third frequency
The sine wave signal of rate is sent to electrode A 310 after the amplification of pumping signal amplification module 331.
Specifically, pumping signal amplification module 331 puts the sine wave signal progress power of the first, second, and third frequency
Greatly.
Further, the processor 320 controls pumping signal generation module 330 and generates the first, second, and third frequency
Sine wave signal, including processor 320 controls pumping signal generation module 330 and generates first, second and the in a time division manner
The sine wave signal of three frequencies；Or, processor 320 controls pumping signal generation module 330 generates first, second with concurrent fashion
With the sine wave signal of third frequency；
Preferably, processor 320 controls pumping signal generation module 330 and generates the first, second, and third frequency in a time division manner
Sine wave signal.
The method that the present embodiment provides, wherein
It is described to receive the coupled signal with different frequency from electrode B 311, including：
Processor 320 is received by receiving channel module 390 and electrode B 311 is received with the first, second, and third frequency
Sine wave coupled signal, the sine wave coupled signal are the equivalent resistance and sample resistance series connection partial pressure of water.
Specifically, 311 detection electrode A 310 of electrode B inject liquid 300 to the first, second, and third frequency just
The coupled signal of string wave excitation signal, the coupled signal are liquid 300 to the sine wave with the first, second, and third frequency
The voltage division signal of pumping signal；
After the coupled signal that electrode B 311 detects is coupled the sampling of sample of signal module 340, by coupled signal amplification module
341, coupled signal peak value hold module 342 and A/D sampling modules 343 are sent to processor 320.
Further, after the coupled signal that the electrode B 311 detects is coupled the sampling of sample of signal module 340, pass through
Coupled signal amplification module 341, coupled signal peak value hold module 342 and A/D sampling modules 343 are sent to processor 320, packet
It includes：
Coupled signal amplification module 341, coupled signal peak value hold module 342 and A/D sampling modules 343 are handled in a time division manner
Sine wave coupled signal with the first, second, and third frequency；Or,
Coupled signal amplification module 341, coupled signal peak value hold module 342 and A/D sampling modules 343 are handled in a parallel fashion
Sine wave coupled signal with the first, second, and third frequency；
Preferably, coupled signal amplification module 341, coupled signal peak value hold module 342 and A/D sampling modules 343 are with the time-division
Mode handles the sine wave coupled signal with the first, second, and third frequency.
Specifically, sine wave of the coupled signal amplification module 341 to collected the first, second, and third faint frequency
Coupled signal is amplified.
Specifically, coupled signal peak value hold module 342 is to the sine wave coupled signal of the first, second, and third frequency
Peak value is kept.
Specifically, A/D sampling modules 343 carry out the peak value of the sine wave coupled signal of the first, second, and third frequency
Analog-to-digital conversion, transformed digital signal are sent to processor 320.
The method that the present embodiment provides, wherein
The corresponding voltage value of coupled signal for calculating different frequency, specifically includes：
Calculate the first, second, and third electricity corresponding with the peak value of sine wave coupled signal of the first, second, and third frequency
Pressure value；
The corresponding voltage value of the coupled signal using different frequency calculates conductivity, specifically includes：
Equivalent resistance Rx is calculated using first, second, and third voltage value, is then converted into the conductivity of liquid 300.
The model of indirect method conductivity measurement includes the joint effect of electrode, dielectric isolation layer and water body, what the present embodiment used
The model of indirect method conductivity measurement is as shown in Figure 2, wherein
Cy is the equivalent capacity that the conductive interlayer of two electrodes generates, and Cx is formed between the conductive layer and fluid to be measured of two electrodes
Equivalent capacity, Rx be fluid to be measured equivalent resistance.Equiva lent impedance model such as formula between two electrodes（1）It is shown.
... ... ... .. formulas（1）
To formula（1）It is converted to obtain complex expression（2）
... ... formulas（2）
To formula（2）Modulo operation obtains the correspondence output impedance that electrode exports in liquid, Rx is solved at this time, and Cy, Cx are only
It needs to select three suitable sine wave exciting signals, the i.e. sine wave exciting signal of the first, second, and third frequency, and obtains
The first, second, and third voltage value corresponding with the peak value of sine wave coupled signal of the first, second, and third frequency is taken, just
It can be to solving corresponding parameter.
The method that the present embodiment provides, wherein
It is described to calculate equivalent resistance Rx using first, second, and third voltage value, it is then converted into the conductance of liquid 300
Rate specifically includes：
The temperature value of liquid 300 is obtained using temperature measurement module 360
The normalized equivalent conductivity of liquid 300 is solved using the temperature value of liquid 300.
The normalized equivalent conductivity calculated relationship is as follows：
25 degree of lower conductivity value=actual conductivity values/（1+0.02*（t-25））；
Wherein, 0.02 is temperature compensation coefficient；T is actual water temperature.
Embodiment two, a kind of liquid electric conductivity measuring device citing
It is shown in Figure 2, a kind of liquid electric conductivity measuring device embodiment provided by the invention, including：
Encourage channel module 380, electrode A 310, receiving channel module 390, electrode B 311 and processor 320；Wherein,
Channel module 380 is encouraged, for sending the sine wave exciting signal with different frequency, including excitation to electrode A 310
Signal generator module 330, pumping signal amplification module 331；
Electrode A 310, the sine wave exciting signal for injecting different frequency to liquid 300, including metallic conductor；
Receiving channel module 390, for being taken from coupled signal of the reception of electrode B 311 with different frequency, including coupled signal
Egf block 340, coupled signal amplification module 341, coupled signal peak value hold module 342, A/D sampling modules 343；
Electrode B 311, the coupled signal for detecting liquid 300 to the sine wave exciting signal of different frequency, including metal are led
Body；
Processor 320, the corresponding voltage value of coupled signal for calculating different frequency, and calculate conductance using the voltage value
Rate, including arithmetic element, storage unit and peripheral interface circuit.
The device that the present embodiment provides, wherein
Channel module 380 is encouraged, for executing the behaviour for sending the sine wave exciting signal with different frequency to electrode A 310
Make, specifically includes following operating procedure：
Processor 320 controls pumping signal generation module 330 and generates the sine wave signal with the first, second, and third frequency,
The sine wave signal of first, second, and third frequency is sent to electrode A 310, electrode A by pumping signal amplification module 331
310 inject received sine wave signal to liquid 300.
Specifically, pumping signal generation module 330 includes DDS（Direct Digital Synthesizer；Direct Digital
Synthesizer）Submodule, DDS submodules generate the sine wave signal of the first, second, and third frequency, the first, second, and third frequency
The sine wave signal of rate is sent to electrode A 310 after the amplification of pumping signal amplification module 331.
Specifically, pumping signal amplification module 331 puts the sine wave signal progress power of the first, second, and third frequency
Greatly.
Further, the processor 320 controls pumping signal generation module 330 and generates the first, second, and third frequency
Sine wave signal, including processor 320 controls pumping signal generation module 330 and generates first, second and the in a time division manner
The sine wave signal of three frequencies；Or, processor 320 controls pumping signal generation module 330 generates first, second with concurrent fashion
With the sine wave signal of third frequency；
Preferably, processor 320 controls pumping signal generation module 330 and generates the first, second, and third frequency in a time division manner
Sine wave signal.
The device that the present embodiment provides, wherein
Receiving channel module 390, for executing the operation for receiving the coupled signal with different frequency from electrode B 311, specifically
Including following operating procedure：
Processor 320 is received by receiving channel module 390 and electrode B 311 is received with the first, second, and third frequency
Sine wave coupled signal, the sine wave coupled signal are the equivalent resistance and sample resistance series connection partial pressure of water.
Specifically, 311 detection electrode A 310 of electrode B inject liquid 300 to the first, second, and third frequency just
The coupled signal of string wave excitation signal, the coupled signal are liquid 300 to the sine wave with the first, second, and third frequency
The voltage division signal of pumping signal；
After the coupled signal that electrode B 311 detects is coupled the sampling of sample of signal module 340, by coupled signal amplification module
341, coupled signal peak value hold module 342 and A/D sampling modules 343 are sent to processor 320.
Further, after the coupled signal that the electrode B 311 detects is coupled the sampling of sample of signal module 340, pass through
Coupled signal amplification module 341, coupled signal peak value hold module 342 and A/D sampling modules 343 are sent to processor 320, packet
It includes：
Coupled signal amplification module 341, coupled signal peak value hold module 342 and A/D sampling modules 343 are handled in a time division manner
Sine wave coupled signal with the first, second, and third frequency；Or,
Coupled signal amplification module 341, coupled signal peak value hold module 342 and A/D sampling modules 343 are handled in a parallel fashion
Sine wave coupled signal with the first, second, and third frequency；
Preferably, coupled signal amplification module 341, coupled signal peak value hold module 342 and A/D sampling modules 343 are with the time-division
Mode handles the sine wave coupled signal with the first, second, and third frequency.
Specifically, sine wave of the coupled signal amplification module 341 to collected the first, second, and third faint frequency
Coupled signal is amplified.
Specifically, coupled signal peak value hold module 342 is to the sine wave coupled signal of the first, second, and third frequency
Peak value is kept.
Specifically, A/D sampling modules 343 carry out the peak value of the sine wave coupled signal of the first, second, and third frequency
Analog-to-digital conversion, transformed digital signal are sent to processor 320.
The device that the present embodiment provides, wherein
Processor 320 calculates the corresponding voltage value of coupled signal of different frequency and using the coupling of different frequency for executing
The operation that the corresponding voltage value of signal calculates conductivity is closed, is specifically included：
The corresponding voltage value of coupled signal for calculating different frequency, specifically includes：
Calculate the first, second, and third electricity corresponding with the peak value of sine wave coupled signal of the first, second, and third frequency
Pressure value；
The corresponding voltage value of the coupled signal using different frequency calculates conductivity, specifically includes：
Equivalent resistance Rx is calculated using first, second, and third voltage value, is then converted into the conductivity of liquid 300.
The model of indirect method conductivity measurement includes the joint effect of electrode, dielectric isolation layer and water body, what the present embodiment used
The model of indirect method conductivity measurement is as shown in Figure 2, wherein
Cy is the equivalent capacity that the conductive interlayer of two electrodes generates, and Cx is formed between the conductive layer and fluid to be measured of two electrodes
Equivalent capacity, Rx be fluid to be measured equivalent resistance.Equiva lent impedance model such as formula between two electrodes（1）It is shown.
... ... ... .. formulas（1）
To formula（1）It is converted to obtain complex expression（2）
... ... formulas（2）
To formula（2）Modulo operation obtains the correspondence output impedance that electrode exports in liquid, Rx is solved at this time, and Cy, Cx are only
It needs to select three suitable sine wave exciting signals, the i.e. sine wave exciting signal of the first, second, and third frequency, and obtains
The first, second, and third voltage value corresponding with the peak value of sine wave coupled signal of the first, second, and third frequency is taken, just
It can be to solving corresponding parameter.
The device that the present embodiment provides, wherein
Processor 320 calculates equivalent resistance Rx using first, second, and third voltage value for executing, then converts
For the operation of the conductivity of liquid 300, specifically include：
The temperature value of liquid 300 is obtained using temperature measurement module 360；
The normalized equivalent conductivity of liquid 300 is solved using the temperature value of liquid 300.
The normalized equivalent conductivity calculated relationship is as follows：
25 degree of lower conductivity value=actual conductivity values/（1+0.02*（t-25））；
Wherein, 0.02 is temperature compensation coefficient；T is actual water temperature.
The device that the present embodiment provides further includes temperature measurement module 360, specifically,
The temperature sensor that temperature measurement module 360 includes is not placed directly in fluid to be measured, the temperature sensing that temperature measurement module 360 includes
Device is using good thermal conductor as passage of heat and as watertight component, to reduce the complexity of watertight structure.
Specifically, the temperature sensor that temperature measurement module 360 includes is using good thermal conductor as passage of heat and as watertight
A kind of specific implementation of component is that the temperature sensor that temperature measurement module 360 includes is placed on electrode A 310 or electrode B
311 rear side realizes two kinds of effects of watertight and heat conduction using electrode A 310 or electrode B 311.
The device that the present embodiment provides further includes communication module 350, specifically,
Communication module 350 and processor 320, which exist, be electrically connected, and is electrically connected with the presence of the communication node of network side or radio
Connection.
Specifically, communication module 350 passes through its being electrically connected between processor 320 and the communication node of network side or nothing
Line is electrically connected, and is obtained control command from the communication node of network side or is sent measurement result to the communication node of network side.
Preferably, there are radio connections between the communication module 350 and the communication node of network side, described to be wirelessly electrically connected
It is connected in the radio connection in accordance with LoRa communication protocols or NB-IOT communication protocols.
Method and device provided in an embodiment of the present invention can use electronic technology, radio transmission techniques in whole or in part
It is realized with Internet technology；Method provided in an embodiment of the present invention, can in whole or in part by software instruction and/or
Hardware circuit is realized；Electronic component realization may be used in the module or unit that device provided in an embodiment of the present invention includes.
The above, only preferred embodiment of the invention, protection domain not for the purpose of limiting the invention.Appoint
Technical staff in what field of the present invention, do not depart from disclosed herein spirit and scope under the premise of, Ke Yi
Any modification and variation, but protection scope of the present invention defining with appended claims are carried out in the form and details of implementation
Subject to range.
The method and device that the present invention provides, overcome conductivity measurement electrode existing for existing conductance measurement technology it is perishable,
Conductivity measurement precision is influenced by electrode surface deposit and temperature measurement increases in watertight structure complexity these disadvantages
It is at least one.It is at low cost, there is practicability.
Claims (12)
1. a kind of liquid electric conductivity measurement method, includes the following steps：
Step S110 sends the sine wave exciting signal with different frequency to electrode A 310；
Step S120 receives the coupled signal with different frequency from electrode B 311；
Step S130 calculates the corresponding voltage value of coupled signal of different frequency；
Step S140 calculates conductivity using the corresponding voltage value of the coupled signal of different frequency.
2. the method for claim 1, wherein
It is described to send the sine wave exciting signal with different frequency to electrode A 310, including：
Processor 320 controls pumping signal generation module 330 and generates the sine wave signal with the first, second, and third frequency,
The sine wave signal of first, second, and third frequency is sent to electrode A 310, electrode A by pumping signal amplification module 331
310 inject received sine wave signal to liquid 300.
3. the method for claim 1, wherein
It is described to receive the coupled signal with different frequency from electrode B 311, including：
Processor 320 is received by receiving channel module 390 and electrode B 311 is received with the first, second, and third frequency
Sine wave coupled signal, the sine wave coupled signal are the equivalent resistance and sample resistance series connection partial pressure of water.
4. the method for claim 1, wherein
The corresponding voltage value of coupled signal for calculating different frequency, specifically includes：
Calculate the first, second, and third electricity corresponding with the peak value of sine wave coupled signal of the first, second, and third frequency
Pressure value；
The corresponding voltage value of the coupled signal using different frequency calculates conductivity, specifically includes：
Equivalent resistance Rx is calculated using first, second, and third voltage value, is then converted into the conductivity of liquid 300.
5. method as claimed in claim 4, wherein
It is described to calculate equivalent resistance Rx using first, second, and third voltage value, it is then converted into the conductance of liquid 300
Rate specifically includes：
The temperature value of liquid 300 is obtained using temperature measurement module 360
The normalized equivalent conductivity of liquid 300 is solved using the temperature value of liquid 300.
6. a kind of liquid electric conductivity measuring device, including：
Encourage channel module 380, electrode A 310, receiving channel module 390, electrode B 311 and processor 320；Wherein,
Channel module 380 is encouraged, for sending the sine wave exciting signal with different frequency, including excitation to electrode A 310
Signal generator module 330, pumping signal amplification module 331；
Electrode A 310, the sine wave exciting signal for injecting different frequency to liquid 300, including metallic conductor；
Receiving channel module 390, for being taken from coupled signal of the reception of electrode B 311 with different frequency, including coupled signal
Egf block 340, coupled signal amplification module 341, coupled signal peak value hold module 342, A/D sampling modules 343；
Electrode B 311, the coupled signal for detecting liquid 300 to the sine wave exciting signal of different frequency, including metal are led
Body；
Processor 320, the corresponding voltage value of coupled signal for calculating different frequency, and calculate conductance using the voltage value
Rate, including arithmetic element, storage unit and peripheral interface circuit.
7. device according to claim 6, wherein
Channel module 380 is encouraged, for executing the behaviour for sending the sine wave exciting signal with different frequency to electrode A 310
Make, specifically includes following operating procedure：
Processor 320 controls pumping signal generation module 330 and generates the sine wave signal with the first, second, and third frequency,
The sine wave signal of first, second, and third frequency is sent to electrode A 310, electrode A by pumping signal amplification module 331
310 inject received sine wave signal to liquid 300.
8. device according to claim 6, wherein
Receiving channel module 390, for executing the operation for receiving the coupled signal with different frequency from electrode B 311, specifically
Including following operating procedure：
Processor 320 is received by receiving channel module 390 and electrode B 311 is received with the first, second, and third frequency
Sine wave coupled signal, the sine wave coupled signal are the equivalent resistance and sample resistance series connection partial pressure of water.
9. device according to claim 6, wherein
Processor 320 calculates the corresponding voltage value of coupled signal of different frequency and using the coupling of different frequency for executing
The operation that the corresponding voltage value of signal calculates conductivity is closed, is specifically included：
The corresponding voltage value of coupled signal for calculating different frequency, specifically includes：
Calculate the first, second, and third electricity corresponding with the peak value of sine wave coupled signal of the first, second, and third frequency
Pressure value；
The corresponding voltage value of the coupled signal using different frequency calculates conductivity, specifically includes：
Equivalent resistance Rx is calculated using first, second, and third voltage value, is then converted into the conductivity of liquid 300.
10. device according to claim 9, wherein
Processor 320 calculates equivalent resistance Rx using first, second, and third voltage value for executing, then converts
For the operation of the conductivity of liquid 300, specifically include：
The temperature value of liquid 300 is obtained using temperature measurement module 360；
The normalized equivalent conductivity of liquid 300 is solved using the temperature value of liquid 300.
11. device according to claim 6 further includes temperature measurement module 360, specifically,
The temperature sensor that temperature measurement module 360 includes is not placed directly in fluid to be measured, the temperature sensing that temperature measurement module 360 includes
Device is using good thermal conductor as passage of heat and as watertight component, to reduce the complexity of watertight structure.
12. device according to claim 6 further includes communication module 350, specifically,
Communication module 350 and processor 320, which exist, be electrically connected, and is electrically connected with the presence of the communication node of network side or radio
Connection.
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| CN111812158A (en) * | 2020-07-10 | 2020-10-23 | 桂林优利特医疗电子有限公司 | Frequency conversion detection method for urine conductivity and osmotic pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111812158A (en) * | 2020-07-10 | 2020-10-23 | 桂林优利特医疗电子有限公司 | Frequency conversion detection method for urine conductivity and osmotic pressure |
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