CN104075997B - A kind of turbidity continuous monitoring method - Google Patents
A kind of turbidity continuous monitoring method Download PDFInfo
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- CN104075997B CN104075997B CN201410326487.2A CN201410326487A CN104075997B CN 104075997 B CN104075997 B CN 104075997B CN 201410326487 A CN201410326487 A CN 201410326487A CN 104075997 B CN104075997 B CN 104075997B
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Abstract
The present invention relates to turbidity continuous monitoring method and monitoring device, suitable for long-term water quality monitoring under water, for the purpose of the light intensity that the method is received by sensor is constant all the time, by adjusting the distance between light source and sensor, or the transmitting light intensity of adjustment light source, turbidity is calculated based on Bill's Lambert law.The device for being used includes light source, light intensity sensor, single-chip microcomputer, slide bar, light source travel mechanism (or light intensity sensor travel mechanism), wireless signal transmitter, wireless signal receiver and data handling system substantially.The present invention can for a long time be placed on the turbidity of METHOD FOR CONTINUOUS DETERMINATION water body in field water, can be according to the change real-time regulation light source or sensing station of turbidity in continuous mode, and the intensity of light source, using water turbidity value and the relation for measuring spacing, water turbidity value and the intensity of light source, the long-term of turbidity is carried out now to monitor, the actual change situation of true reflection water body, monitoring process is accurate, reasonable.
Description
Technical field
The present invention relates to turbidity monitoring technology, a kind of more particularly to being applied to connects for a long time to field water turbidity
The monitoring method and device of continuous monitoring.
Background technology
Turbidity is used to represent the limpid or muddy degree of water, is a kind of expression term of water sample optical property, with suspension
The mass concentration of thing, the size of particle, shape, refractive index etc. are relevant, and suspension more at most turbidity is bigger.Turbidity size
The pollution level of water-outlet body can be reflected to a great extent, be to weigh one of important monitoring index of water quality condition at present.
The turbidity of running water should be represented with nephelometric turbidity unit NTU, no more than 3NTU, is in particular cases also not to be exceeded
5NTU.The turbidity of many industrial waters is also quite important.Using the Soft Drinks Plant of the surface water, food processing factory and water treatment plant,
Generally rely on coagulation, precipitation and filter the aquatic products satisfied to ensure offer.
The method of conventional measurement turbidity mainly has two kinds of transmission beam method and scattering method.The general principle of transmission beam method is
According to the Lambert law of Bill one, the turbidity of water sample is determined with the intensity through light, water sample turbidity is negative right with light transmittance
Number is linear, and turbidity is higher, and light transmittance is smaller.
The assay method suitable for transmission principle has AAS and visual method at present, but both of which has difference
Defect.AAS needs to gather water body sample, and prepares turbidity standard and compare, and required time is more long and operation
It is complicated.And visual method is more with natural light as light source, its wave-length coverage very wide can cause evaluated error, while also examined person master
The influence of sight factor is larger, and precision is relatively low, poor reproducibility.
At present suitable for the transmission-type water turbidity detector of transmission beam method, due to circuit and sensor self-characteristic,
Not only error is very big in the case of water turbidity is less, and is difficult to complete continuous monitoring requirement.Again due to by natural
The interference of yellow present in water, lake, reservoir water to measure also because containing organic extinction materials such as algae, also having interference.
Scattering method is also that its principle is Rayleigh (Rayleigh) scattering principle, auspicious using more turbidity measuring methods
The intensity that light is scattered in sharp scattering principle is inversely proportional with the biquadratic of the wavelength of incident light, and wavelength is shorter, and scattering is stronger, scattering
Method determines intensity and in water sample turbidity intergranular proportional relation of the turbidity according to scattering light, and water sample turbidity is determined to reach
Purpose.Scattered when particle size is 1/15~l/20 of lambda1-wavelength, intensity meets Rayleigh equation, but works as particle diameter
Do not worked then during more than l/2 wavelength.It is applied in the determining instrument of scattering method, dirty glassware, underwater bubble and water
The factors such as middle dissolved matter can all make determination data relatively low, negative interference occur.Although it is generally acknowledged that this purification to treating
The influence of aquametry result is little, but purified treatment was not carried out field water more, therefore, method high turbidity water's body in the wild
Middle application has certain limitation.
Scattering-transmission-type method is combined with scattering and transmiting two methods, using Ir/It=KD or Ir/ (Ir+It)=KD
(Ir is scattered light intensity, and It is transmitted intensity, and K is proportionality constant, and D is light path, i.e., the distance that light is passed through in a liquid), surveys
The intensity sum of transmitted light and reflected light is determined, to be measured to sample turbidity.Because determining transmission simultaneously and scattering light
Intensity, so having sensitivity higher in the case of incident intensity identical.The reality of Patent No. 201320300650.9
A kind of online self-alignment turbidity instrument system is disclosed with new patent, the system is used by light source, measurement photo-detector, calibration
Photo-detector, reflection and transmission part, testing liquid etc. are constituted；The position of above-mentioned part meets following relation：The light that light source sends
Line after being scattered by after reflection and transmission part, partly along former radiation direction transmissive, into the liquid of turbidity to be measured, entering
Measurement photo-detector；The light that light source sends by reflection and transmission part by after reflection and transmission part, partly being reflected, reflection light
Into calibration photo-detector.The transmissometer solves traditional transmissometer to be needed periodically or non-periodically to light source in use
Carry out the problem of offline manual calibration.
Therefore for entirety, at present still without the instrument that can in real time, for a long time, continuously measure field water turbidity online
Device and corresponding monitoring method.
The content of the invention
The problem of long-term continuous measurement under water is not applied in the wild the present invention be directed to current monitoring device, is carried accordingly
For a kind of turbidity continuous monitoring method and monitoring device.The device can for a long time be placed on METHOD FOR CONTINUOUS DETERMINATION in field water
The turbidity of field water.Can be according to the change real-time regulation light source position of turbidity or light source strength in continuous mode
Degree, the actual change situation of true reflection water body, monitoring process is more accurate, reasonable, for the change for grasping Water quality provides weight
Want basic data.
To achieve the above object, the present invention takes following technical scheme：
A kind of turbidity continuous monitoring method, according to Beer-Lambert law expression formula,
C=- [ln (I`/I)]/kd
Wherein, I`：Light intensity sensor receives light intensity, I in water body：Source emissioning light is strong, c：Turbidity, d：Light source with
The distance between light intensity sensor, k：Proportionality constant, is measured correction and is obtained by using preceding contrast with standard turbidity solvent,
With following regulating step：
1) first regulation light source and sensor between apart from d,
2) then regulation the strong I of source emissioning light,
And it is initial set value to maintain light intensity sensor to receive light intensity I` and return, so as to calculate water turbidity value c；
Wherein, the determination method of the initial set value of light intensity sensor reception light intensity is：
In the standard solvent that water turbidity is 1, a fixed source emissioning light is given by force, by light source and light intensity sensor
The distance between be set as maximum, calculate the light intensity that now sensor is received, as initial set value.
The specific implementation method of the regulating step is：
1. one critical reference distance of system calibrating first, scaling method is：
It is strong based on a fixed source emissioning light on the basis of the initial set value for receiving light intensity, is given, calculate first
Water turbidity is corresponding apart from d1 when being 1, then often increases a unit turbidity correspondence and calculates a distance, when discovery is a certain turbid
Under degree, when being further added by a unit turbidity, corresponding distance change compared to very little before, needed for can not having reached
Required precision, then corresponding distance is critical reference distance under remembering described a certain turbidity, and the described a certain turbidity of note is critical
With reference to turbidity；
2. and then in specific regulation, first keep the strong definite value below maximum of source emissioning light constant, regulation
Distance between light source and light intensity sensor, if it find that the distance between light source and light intensity sensor do not reach also critical reference away from
From when, the light intensity that light intensity sensor is received just has returned to initial set value, then need not adjust light source intensity, calculates now
Distance, source emissioning light it is strong it is corresponding with light intensity initial set value is received under water turbidity, be exactly required water turbidity value；
3. if it find that the distance between light source and light intensity sensor have arrived at critical reference apart from when, light intensity sensor connects
The light intensity for receiving also is not returned to initial set value, then stop adjustable range, switchs to regulation source emissioning light by force, when light source transmitting
When light intensity is I, it is initial set value that the light intensity I` that light intensity sensor is received is returned, then calculate distance, light source transmitting now
Water turbidity under light intensity is corresponding with light intensity initial set value is received, is exactly required water turbidity value.
The above method be suitable to monitoring maximum water turbidity be：Determine light intensity initial set value, critical reference distance is received
On the basis of, constantly increase source emissioning light is strong, is also initial setting when source emissioning light reaches by force maximum and receives light intensity
During value, corresponding turbidity value is just maximum detection water turbidity.
A kind of monitoring device for realizing the above method, including：
Light source, slide bar, light source movement stepper motor, light intensity sensor, single-chip microcomputer,
Light source is fixed on light source movement stepper motor, and light source movement stepper motor is self-powered, is slidably installed on slide bar, light
Source and light source movement stepper motor are all connected by wire with the PWM output pins of single-chip microcomputer；
Light intensity sensor, single-chip microcomputer are each attached on slide bar the one end from light source farther out, and light intensity sensor and single-chip microcomputer
External pulse count pin be connected.
Another kind realizes the monitoring device of the above method, including：
Including light source, slide bar, light intensity sensor movement stepper motor, light intensity sensor, single-chip microcomputer；
Light source is fixed on one end of slide bar；
Light intensity sensor is fixed on light intensity sensor movement stepper motor, and light intensity sensor moves stepper motor from powered
Source, is slidably installed on slide bar, and light source and light intensity sensor move stepper motor all by wire and the PWM output pin phases of single-chip microcomputer
Even；
Light intensity sensor counts pin and is connected with the external pulse of single-chip microcomputer.
In two kinds of above-mentioned monitoring devices, also including wireless signal transmitter, wireless signal receiver, data processing system
System, wireless signal transmitter and the single-chip microcomputer are used by serial communication, wireless signal transmitter with wireless signal receiver
Bluetooth communication, wireless signal receiver is connected with the signal input part of data handling system.
Wireless signal transmitter is also mounted on slide bar.
Corresponding to the first device, the light source, slide bar, light source movement stepper motor, light intensity sensor, single-chip microcomputer, nothing
Line signal projector, is all arranged under water, has sealing to protect；The wireless signal receiver and data handling system are arranged at ground
On.
Corresponding to light source, slide bar, light intensity sensor movement stepper motor, light intensity sensor, monolithic described in second device
Machine, wireless signal transmitter, are all arranged under water, have sealing to protect；The wireless signal receiver and data handling system set
It is placed on the ground.
Due to taking above technical scheme, it has the advantages that the present invention：
1st, the present invention can in the course of the work, and the signal for keeping light-sensitive element (light intensity sensor) to receive remains steady
It is fixed, it is to avoid the error produced by the self-characteristic of light-sensitive element and circuit problem.
2nd, turbidity monitoring device of the invention can be according to the change of different times water turbidity, automatic transformation assay mould
Formula, it is ensured that determining has accuracy and bigger detection range higher.
3rd, the present apparatus can for a long time be positioned over water body, and continuous monitoring is implemented according to detection requirement, reach the mesh of real-time monitoring
's.
4th, the present apparatus is by the way of pre-setting, and the signal that setting light intensity sensor is received is constant all the time, it is to avoid
AAS is required for the step of preparing comparison solution again every time, also without sampling, can be directly used for the survey of field water
Amount；Using sensitive optical element in test, it is to avoid the subjective factor influence of visual method.
5th, the present apparatus has simple structure, it is easy to the characteristics of operation and labour cost are relatively low.
Brief description of the drawings
Fig. 1 is the structural representation of turbidity monitoring device embodiment one of the present invention.
Fig. 2 is the structural representation of turbidity monitoring device embodiment two of the present invention.
Specific embodiment
The present invention is further described with specific embodiment below in conjunction with the accompanying drawings, advantages of the present invention and feature will be with
Description and it is apparent.But these embodiments are only exemplary, do not constitute any limitation to the scope of the present invention.This area
Technical staff should be understood that without departing from the spirit and scope of the invention can be to the details of technical solution of the present invention
The equivalent modifications carried out with form or replacement, these modifications and replacement all should fall under the scope of the present invention.
It is known that according to Beer-Lambert law, in water transmission, water body receives the collimated light beam that light source is launched
To light intensity and source emissioning light be strong, turbidity and distance light travels meet following formula (1)：
I`=Ie(-kcd) (1)
Wherein, I`：The light intensity that light-sensitive element (i.e. light intensity sensor) is received in water body, I：The light intensity of light source transmitting, e：
Natural logrithm, c：Turbidity, d：Light by light emission to light-sensitive element distance, k：Proportionality constant.
Formula (1) can further be converted into formula (2)：
C=- [ln (I`/I)]/kd (2)
From formula (2), turbidity c can by receive light intensity I`, light source intensity I and distance light travels d with
And proportionality constant k is calculated.Proportionality coefficient k is measured correction and is obtained by using preceding contrast with standard turbidity solvent.
Based on above-mentioned principle, the present invention accordingly proposes a kind of method of turbidity continuous monitoring, the core of the method
Theory is all, with the change of different times water turbidity in monitoring process, to automatically adjust light source with sensor apart from d and light
Light intensity I is launched in source, and it is initial set value to maintain the light intensity I` that light intensity sensor is received to return, according to Beer-Lambert law,
Calculate water turbidity value c.Because the inventive method is to be always ensured that the light intensity that light intensity sensor is received is reverted to initially
Setting value, it is possible to be not required to correct and can still use in measurement next time, so ensure that device can for a long time under water
Place, reach the long-term purpose for continuing to monitor.
Because can be related to receive the problem of light intensity I` initial values setting in the above method, and when adjustable range, adjust
Save to what degree, when adjust light intensity, a series of regulation judgment criterion problems to what degree.Therefore, in tool
When body is related to monitoring step, a series of calibration values that dispatch from the factory of system should be first determined, determine how to adjust d and tune on this basis
I.Factory-designed method is as follows：
1) on the demarcation of reception light intensity initial value：Beer-Lambert law is equally based on, it is molten in the standard that water turbidity is 1
In agent, a fixed light source light intensity values are given, the distance between light source and sensor are set as maximum, calculating is now sensed
The light intensity I` that device is received, as initial set value.So set the reasons why be, it is smaller in water turbidity, it is in larger distance in the case of
The light intensity for receiving is certainly larger suitable for water turbidity, and in adjustable actual water body measurement.
2) on the demarcation of the critical reference distance between light source and sensor：Why demarcate a critical reference away from
From because when water turbidity is larger, the increase of commensurate's turbidity can only cause apart from minimum change, and this is not only easy
Larger measurement error is produced, while the required precision of change detection device of also adjusting the distance is very high, cost of manufacture is increased.So,
The method of demarcation is：On the basis of reception light intensity initial value based on setting, a fixed light source intensity is given, calculated first
Water turbidity is corresponding apart from d1 when being 1, is then increased a unit turbidity and is calculated a distance with every, when such as water turbidity is 2 pair
Answer apart from d2, by that analogy.When discovery is under some turbidity, when being further added by a unit turbidity, corresponding distance change
Very little, it is impossible to reach required required precision, now, corresponding distance is critical reference distance under remembering the turbidity, and this is turbid
Degree is designated as critical reference turbidity.
3) on the demarcation of system maximum detection turbidity：Receive light intensity initial value, the base all determined in critical reference distance
On plinth, constantly increase light source intensity, (and the light intensity that light intensity sensor is sensed is exactly when source emissioning light reaches by force maximum
Initial set value I`) when, corresponding turbidity value is designated as maximum detection turbidity, and maximum detection turbidity means the device not
Water body of the turbidity more than the value can be determined.
On the basis of above-mentioned demarcation, when specifically monitoring, it is divided into two kinds of situation treatment：
One, keep the strong definite value below maximum of source emissioning light constant first, regulation light source and light intensity are sensed
Distance between device；If it find that adjust do not reached also apart from d critical reference apart from when, light intensity sensor can just received
To light intensity I` return to initial value, then need not adjust light source intensity I, calculate the now c of d, I with I` under corresponding, be exactly required
Water turbidity value.
Two, first keep the strong definite value below maximum of source emissioning light constant, adjust light source and light intensity sensor
Between distance；If it find that adjustable range reach critical reference apart from when, the light intensity that light intensity sensor is received also is not returned to
Initial value, then stop adjustable range, switchs to adjust light source intensity, when light source intensity is I, can make what light intensity sensor was received
Light intensity I` returns to initial value, then calculate now critical reference distance, cs of the I with I` under corresponding, is exactly required water turbidity value.
In order to realize the above method, the present invention provides two kinds of turbidity continuous monitoring devices.
The first device is：As shown in figure 1, the device includes that light source 1, slide bar 2, light source movement stepper motor 3, light intensity are passed
Sensor 4, single-chip microcomputer 5, wireless signal transmitter 6, wireless signal receiver 7, data handling system 8.
Light source 1 is fixed on light source movement stepper motor 3, and light source movement stepper motor 3 is self-powered, is slidably installed in slide bar 2
On, its movement is controlled by single-chip microcomputer 5.Light source 1 and light source movement stepper motor 3 are all by wire and the PWM (arteries and veins of single-chip microcomputer 5
Rush width modulated) output pin be connected.
Light intensity sensor 4, single-chip microcomputer 5, wireless signal transmitter 6 are each attached to the one end on slide bar 2 from light source 1 farther out,
And light intensity sensor 4 counts pin and is connected with the external pulse of single-chip microcomputer 5, wireless signal transmitter 6 passes through TX RX pins and list
The RXD TXD pins of piece machine are connected, i.e., communicated by serial ports.Wireless signal transmitter 6 is used with wireless signal receiver 7
Bluetooth communication, wireless signal receiver 7 is connected with the signal input part of data handling system 8.Because the present apparatus is except wireless communication
Outside number receiver 7 and data handling system 8, remaining part will be placed in water body, so each several part being placed in water body can not
It is enough with water directly contact, it is therefore desirable to by the sealing of each part, install waterproof case additional, or to apply waterproof material etc. achievable.
The operation principle of the first device is：
Directional light, the light intensity that sensing light source sends in real time of light intensity sensor 4, and the light intensity that will be received are sent by light source 1
Change into voltage signal to send in real time to single-chip microcomputer 5, single-chip microcomputer 5 reads the signal of light intensity sensor, and single-chip microcomputer passes through two-way PWM
The distance between ripple adjusts light-source brightness respectively, or light source and sensor.Single-chip microcomputer 5 changes light source movement by adjusting PWM ripples
The position of stepper motor, or light intensity increase and decrease frequency, light intensity sensor 4 is detected light intensity and revert to initial value and tend to all the time
Stabilization, that is, remain that the reception light intensity after transmission is definite value.Single-chip microcomputer 5 will be conversed according to the adjusted value of pwm signal
Light intensity after light source change, or the distance between light source and sensor.According to Beer-Lambert law, you can to calculate water turbidity.
Concrete operation step is：1) first keep the strong definite value below maximum of source emissioning light constant, light source shifting
Dynamic stepper motor 3 moves closer to light intensity sensor 4 from distalmost end, if it find that light source movement stepper motor 3 and light intensity sensor 4
Between distance do not reach also critical reference apart from when, the light intensity I` that light intensity sensor 4 is received just has returned to initial value, then
Light source intensity need not be adjusted, is now calculated under the distance, under the light source intensity and under the reception light intensity initial value of setting
C, is exactly required water turbidity value.2) if it find that regulation distance reach critical reference apart from when, light intensity sensor is received
Light intensity be also not returned to initial value, then stop adjustable range, switch to adjust light source intensity, when light source intensity be I when, light can be made
The light intensity I` that strong sensor is received returns to initial value, then stop regulation, and now calculating critical reference is under, the light source intensity
C under lower and setting reception light intensity initial value, is exactly required water turbidity value.
Second device be：As shown in Fig. 2 the device include light source 1, slide bar 2, light intensity sensor movement stepper motor 9,
Light intensity sensor 4, single-chip microcomputer 5, wireless signal transmitter 6, wireless signal receiver 7, data handling system 8.
Light source 1 is fixed on one end of slide bar 2, light intensity sensor movement stepper motor 9, light intensity sensor 4, single-chip microcomputer 5, nothing
Line signal projector 6 is also mounted on slide bar 2, but is located remotely from one end of light source.Light intensity sensor 4 is sensed installed in light intensity
On device movement stepper motor 9, stepper motor is self-powered, is slidably installed on slide bar 2, and stepper motor is controlled its shifting by single-chip microcomputer 5
Dynamic paces.Light source 1 and light intensity sensor movement stepper motor 9 are by wire and two PWM (pulse width modulation) of single-chip microcomputer 5
Output pin is connected.Light intensity sensor 4 counts pin and is connected with the external pulse of single-chip microcomputer 5.Wireless signal transmitter 6 passes through TX
RX pins are connected with the RXD TXD pins of single-chip microcomputer, i.e., communicated by serial ports.Wireless signal transmitter 6 and wireless signal
Receiver 7 uses bluetooth communication, wireless signal receiver 7 to be connected with the signal input part of data handling system 8.Because the present apparatus
In addition to wireless signal receiver 7 and data handling system 8, remaining part will be placed in water body, so being placed in water body
Each several part can not be with water directly contact, it is therefore desirable to by the sealing of each part, installs waterproof case additional, or apply waterproof material etc..
The operation principle of second device is：
Directional light, the light intensity that sensing light source sends in real time of light intensity sensor 4, and the light intensity that will be received are sent by light source 1
Change into voltage signal to send to single-chip microcomputer 5 in real time, single-chip microcomputer 5 reads the signal of light intensity sensor, and by being wirelessly transferred
Data are uploaded to data handling system 8 by mode.And the two-way PWM ripples of single-chip microcomputer 5 control light intensity sensor movement stepper motor 9
Mobile or adjustment light source 1 intensity, makes light intensity sensor 4 detect light intensity and returns initial value, and tend towards stability all the time.Same
Principle is exactly to remain that the receptions light intensity after transmission is the initial value for setting, and changes output intensity or distance, according to than
That-Lambert law, calculates water turbidity.
Concrete operation step is：1) first keep the strong definite value below maximum of source emissioning light constant, light intensity biography
Sensor movement stepper motor 9 moves closer to light intensity sensor 4 from distalmost end, if it find that light source movement stepper motor 3 and light intensity
Distance between sensor 4 do not reach also critical reference apart from when, the light intensity I` that light intensity sensor 4 is received just have returned to just
Initial value, then need not adjust light source intensity, now calculate under the distance, under the light source intensity and setting reception light intensity it is initial
C under value, is exactly required water turbidity value.2) if it find that regulation distance reach critical reference apart from when, light intensity sensor
The light intensity for receiving also is not returned to initial value, then stop adjustable range, switchs to adjust light source intensity, when light source intensity is I,
The light intensity I` that can receive light intensity sensor returns to initial value, then stop regulation, and now calculating critical reference is under, the light
C under the light intensity of source and under the reception light intensity initial value of setting, is exactly required water turbidity value.
In above-mentioned two classes device, light source 1 is the monochromatic source of energy emitting parallel light, and light emitting diode may be selected, can basis
The suitable wavelength of different choice of water body situation.The optional model ATmega16 of single-chip microcomputer 5.Wireless signal transmitter 6 and wireless
Signal receiver 7 may be selected HC-06 models, entitled transmitter or receiver, actual all with wirelessly function is transmitted/received, and launch
Be 2.4GHz signals.Signal is produced by wireless data transmission module, and wireless data transmission module is transparent transmission mode, the letter that single-chip microcomputer is sent
Breath is transmitted to receiving terminal.Wireless signal transmitter and receiver are by the way of being wirelessly transferred by single-chip microcomputer and terminal (data
Processing system) it is connected, it is to avoid the inconvenience that conductor strip is come.Data handling system can be used common notebook computer or desktop computer.
From the above, it can be seen that either from for the angle of adjustment light source position or strong from regulation source emissioning light
Angle for, or adjustment light intensity sensor position for, can realize adjust light-sensitive element influence value, make photosensitive
Element testing to light intensity recover to the purpose of initial value.
Conventional transmissometer, only with the function of determining turbidity, is changed by the voltage signal for monitoring sensor, that is, connect
The change of the value of light intensity I` is received, water turbidity is calculated by formula.It is that reversely setting is passed and the present invention changes conventional mentality of designing
It is a fixed value that sensor receives light intensity I`, by adjusting the distance between light source and sensor d, or light source outgoing intensity of illumination
Light intensity I` is constant all the time to maintain to receive for I, and this design behave considers the transmission stability problem of sensor, letter without emphasis
Change the circuit design of sensor, only need to simply adjust the distance between light power or light source and sensor,
Operation becomes easier.Meanwhile, this design concept of the invention, it is important that light intensity sensor can be automatically adjusted returning
Initial value is grouped into, this is a kind of splendid solution for long-term continuous measurement under water, this facilitate that measurement next time.Such as
Fruit can only be measured and can not correct back to and be grouped into initial value under water as prior art, and wanting correction can only be lifted to ground
OK, do so operation sequence will be very complicated.Meanwhile, said apparatus are changed in the prior art with having while structure is simplified
Inconvenience and measurement drawback that the mode of line connection is brought, are that measurement device brings convenient and measurement accuracy.
Claims (2)
1. a kind of turbidity continuous monitoring method, it is characterised in that：According to Beer-Lambert law expression formula：
C=- [ln (I`/I)]/kd
Wherein, I`：Light intensity sensor receives light intensity, I in water body：Source emissioning light is strong, c：Turbidity, d：Light source and light intensity
The distance between sensor, k：Proportionality constant, is measured correction and is obtained by using preceding contrast with standard turbidity solvent,
With following regulating step：
1) first regulation light source and light intensity sensor between apart from d,
2) then regulation the strong I of source emissioning light,
And it is initial set value to maintain light intensity sensor to receive light intensity I` and return all the time, so as to calculate water turbidity c；
Wherein, the determination method of the initial set value of light intensity sensor reception light intensity is：
In the standard solvent that water turbidity is 1, a fixed source emissioning light is given by force, by between light source and light intensity sensor
Distance be set as maximum, calculate the light intensity that now sensor is received, as initial set value；
The specific implementation method of the regulating step is：
1. one critical reference distance of system calibrating first, scaling method is：
It is strong based on a fixed source emissioning light on the basis of the initial set value for receiving light intensity, is given, it is fixed according to Beer-Lambert
Rule expression formula, calculates corresponding apart from d1 when water turbidity is 1 first, then often increases a unit turbidity correspondence and calculates one
Distance, when finding under a certain turbidity, when being further added by a unit turbidity, corresponding distance change is compared to before very
It is small, required required precision can not have been reached, then corresponding distance is critical reference distance under remembering a certain turbidity, and note is described
A certain turbidity is critical reference turbidity；
2. in specific regulation, first keep the strong definite value below maximum of source emissioning light constant, adjust light source and light
Distance between strong sensor, if it find that the distance between light source and light intensity sensor do not reach also critical reference apart from when, light
The light intensity that strong sensor is received just has returned to initial set value, then need not again adjust light source intensity, calculate now away from
From, source emissioning light it is strong it is corresponding with light intensity initial set value is received under water turbidity, be exactly required water turbidity value；
3. first keep the strong definite value below maximum of source emissioning light constant, between regulation light source and light intensity sensor away from
From, if it find that distance between light source and light intensity sensor reach critical reference apart from when, the light intensity that light intensity sensor is received
Initial set value is also not returned to, then stops adjustable range, switch to regulation source emissioning light by force, when source emissioning light is by force I,
It is initial set value that light intensity I` that light intensity sensor is received is returned, then calculate distance now, source emissioning light is strong and receives
Water turbidity under light intensity initial set value correspondence, is exactly required water turbidity value.
2. turbidity continuous monitoring method according to claim 1, it is characterised in that：Methods described is suitable to monitoring
The decision method of maximum water turbidity is：On the basis of light intensity initial set value, critical reference distance determination is received, constantly increase
Source emissioning light is strong, and when source emissioning light reaches by force maximum, and the light intensity that light intensity sensor is sensed is exactly initial setting
During value I`, corresponding turbidity value is just maximum detection water turbidity.
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| CN201410326487.2A CN104075997B (en) | 2014-07-10 | 2014-07-10 | A kind of turbidity continuous monitoring method |
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| CN104075997B true CN104075997B (en) | 2017-06-09 |
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| CN106018408B (en) * | 2016-07-06 | 2019-03-26 | 江苏中农物联网科技有限公司 | A kind of aquaculture water quality Turbidity measurement instrument |
| CN106769886A (en) * | 2017-01-12 | 2017-05-31 | 薛永富 | A kind of liquid transparency fully-automated synthesis method |
| CN106771289A (en) * | 2017-02-06 | 2017-05-31 | 薛永富 | A kind of liquid transparency equipment |
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| CN107345707B (en) * | 2017-03-29 | 2023-07-25 | 宁波方太厨具有限公司 | Air purifying system |
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| CN107340275B (en) * | 2017-03-29 | 2023-07-25 | 宁波方太厨具有限公司 | Water quality on-line detection system |
| CN107340254B (en) * | 2017-03-29 | 2023-07-25 | 宁波方太厨具有限公司 | Handheld organic matter detection terminal and detection method thereof |
| CN107340258B (en) * | 2017-03-29 | 2023-07-21 | 宁波方太厨具有限公司 | System for detecting organic matters in air |
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| CN107340263B (en) * | 2017-03-29 | 2023-07-25 | 宁波方太厨具有限公司 | System for detecting organic matters in air |
| CN107907506B (en) * | 2017-11-08 | 2020-05-19 | 华东师范大学 | Measuring device and method for measuring sand content in wide range and dynamic optimal resolution |
| CN110051285B (en) * | 2019-04-18 | 2021-12-24 | 云鲸智能科技（东莞）有限公司 | Detection method, device and storage medium |
| CN114387235B (en) * | 2021-12-30 | 2024-02-09 | 重庆知行数联智能科技有限责任公司 | Water environment monitoring method and system |
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| CN103308483B (en) * | 2013-06-04 | 2016-06-01 | 杭州遂真生物技术有限公司 | A kind of drinks turbidity detection method and device |
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