CN117420092A - Water quality detection method, device and equipment - Google Patents
Water quality detection method, device and equipment Download PDFInfo
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- 239000007788 liquid Substances 0.000 claims abstract description 129
- 238000000034 method Methods 0.000 claims description 26
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000004364 calculation method Methods 0.000 claims description 15
- 238000012372 quality testing Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 description 9
- 239000000126 substance Substances 0.000 description 7
- 101100379080 Emericella variicolor andB gene Proteins 0.000 description 4
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- 230000004044 response Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
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- 230000000694 effects Effects 0.000 description 1
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- 238000012994 industrial processing Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 1
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N21/3151—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using two sources of radiation of different wavelengths
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1806—Biological oxygen demand [BOD] or chemical oxygen demand [COD]
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Abstract
The application is applicable to the technical field of water quality detection, and provides a water quality detection method, a device and equipment, wherein the water quality detection equipment comprises: three light source signal transmitting ends, three light source signal receiving ends and a processor; the three light source signal transmitting ends generate three light source signals, the three light source signals reach the three light source signal receiving ends through the liquid to be detected, and the three light source signals comprise two paths of ultraviolet light signals and one path of infrared light signals; the three light source signal receiving ends receive the light source signals, convert the three light source signals into voltage signals and send the voltage signals to the processor; the processor receives the voltage signal, determines the signal intensity of the received three paths of light source signals according to the voltage signal, calculates the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal, calculates the first COD and the second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected, and determines the final COD value of the liquid to be detected according to the first COD and the second COD. The accuracy of COD value detection can be improved.
Description
Technical Field
The application belongs to the technical field of water quality detection, and particularly relates to a water quality detection method, a water quality detection device and water quality detection equipment.
Background
In daily life and industrial production process, water is needed, and the quality of water is related to the health and sanitation degree of people, and the fineness and safety of industrial production and processing are also affected, so that the quality parameters of water body are needed to be detected.
COD (Chemical Oxygen demand ) is a common comprehensive index for evaluating the pollution degree of water, and refers to the amount of oxygen consumed by oxidative decomposition of reducing substances (such as organic substances) in water by using a chemical oxidant (such as potassium dichromate), and reflects the pollution degree of the water by the reducing substances.
Ultraviolet-visible spectrometry is a method of analyzing and measuring water quality by utilizing the molecular absorption of certain substances to set the radiation in a spectral region (for example, 200nm to 800 nm). The detection of the COD of the water quality by the ultraviolet-visible spectrum method has the advantages of rapidness, no secondary pollution, pollution tracing and the like, and is widely applied to the water quality detection. However, in the traditional water quality detection method, most of the traditional COD detection method adopts a chemical titration mode for measurement, so that not only is the operation mode relatively complex, but also unavoidable manual errors are always brought about by manual titration, and secondary pollution is often caused by reaction products, so that the method is not friendly to the environment.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiments of the present application provide a water quality detection method, apparatus and device.
The application is realized by the following technical scheme:
in a first aspect, embodiments of the present application provide a water quality detection apparatus, including: three light source signal transmitting ends, three light source signal receiving ends and a processor;
the three light source signal transmitting ends are used for generating three light source signals, the three light source signals reach the three light source signal receiving ends after passing through the liquid to be detected, and the three light source signals comprise two paths of ultraviolet light signals and one path of infrared light signals;
the three light source signal receiving ends are used for receiving corresponding light source signals, converting the three light source signals into voltage signals and sending the voltage signals to the processor;
the processor receives the voltage signal and implements the steps of:
determining the signal strength of the received three paths of light source signals according to the voltage signals;
calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal;
calculating to obtain a first COD and a second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected;
determining a final COD value of the liquid to be detected according to the first COD and the second COD;
The calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal comprises the following steps:
by passing throughCalculating the turbidity of the liquid to be detected;
wherein,Trubfor the turbidity of the liquid to be detected,for detecting the signal intensity of the infrared light signal received when pure water is present, < >>In order to detect the liquid to be detectediThe signal strength of the infrared light signal received at the moment,aandcsignal intensity for infrared light signal->And turbidity (turbidity)TrubCoefficients of linear relationship between;
the first COD and the second COD are obtained by calculation according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected, and the method comprises the following steps:
by passing throughCalculating to obtain first COD->For detecting the signal intensity of the first ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of the first path of ultraviolet light signal received at the moment;
by passing throughCalculating to obtain second COD->For detecting the signal intensity of the second ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of a second path of ultraviolet light signal received at the moment;
wherein,KandBis the signal intensityEAnd (3) withCODThe coefficient of the linear relationship between them,Ais turbidityTurbThe influence on the COD of the steel is that, A=(Turb-b)/d，bAnddis turbidityTurbAnd (3) withACoefficients of linear relationship between.
With reference to the first aspect, in some embodiments, each light source signal transmitting end includes a light source generating circuit, where the light source generating circuit includes: the light source, the first amplifier, the triode, the analog switch, the first resistor, the sixth resistor and the first capacitor;
the common switch port of the analog switch is connected with an external power supply VERF through a first resistor, and the common point of the common switch port of the analog switch and the first resistor is grounded through a second resistor; the switch selection port of the analog switch is connected with the third resistor and is connected with the control signal through the third resistor; the normally open switch port of the analog switch is connected with the normal phase input end of the first amplifier, and the common point of the normally open switch port of the analog switch and the normal phase input end of the first amplifier is grounded through a fourth resistor; the grounding port of the analog switch is grounded, and the power port of the analog switch is connected with an external power supply VCC;
the output end of the first amplifier is connected with the base electrode of the triode through a fifth resistor, the inverting input end of the first amplifier is connected with the emitter electrode of the triode, the inverting input end of the first amplifier is grounded with the emitter electrode of the triode through a sixth resistor, and the power supply end of the first amplifier is connected with an external power supply VCC and is connected with the grounding port of the analog switch through a first capacitor;
The collector of the triode is connected with the light source.
With reference to the first aspect, in some embodiments, each light source signal receiving end includes a light source receiving circuit, the light source receiving circuit including a receiving photocell, a second amplifier, a third amplifier, seventh to eleventh resistors, and second to sixth capacitors;
the receiving photocell is connected with the inverting input end of the second amplifier, the non-inverting input end of the second amplifier is grounded, the inverting input end of the second amplifier is connected with the output end of the second amplifier through a second capacitor and a seventh resistor which are connected in parallel, the output end of the second amplifier is connected with the inverting input end of the third amplifier through an eighth resistor, and the power supply end of the second amplifier is connected with an external power supply;
the non-inverting input end of the third amplifier is grounded through a ninth resistor, the inverting input end of the third amplifier is connected with the output end of the third amplifier through a third capacitor and a tenth resistor which are connected in parallel, and two power supplies of the third amplifier are connected with an external power supply and are grounded through a fourth capacitor and a fifth capacitor respectively;
the output end of the third amplifier is connected with the signal output end of the light source receiving circuit through an eleventh resistor, and a common point between the eleventh resistor and the signal output end of the light source receiving circuit is grounded through a sixth capacitor.
In combination with the first aspect, in some embodiments, the wavelengths of the two ultraviolet light signals are 254nm and 275nm, respectively, and the wavelength of the one infrared light signal is 880nm.
In a second aspect, embodiments of the present application further provide a water quality detection method, including:
receiving three paths of light source signals, wherein the three paths of light source signals are respectively emitted by different light source signal emitting ends and are received by corresponding light source signal receiving ends after passing through liquid to be detected, and the three paths of light source signals comprise two paths of ultraviolet light signals and one path of infrared light signals;
determining the signal strength of the received three paths of light source signals;
calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal;
calculating to obtain a first COD and a second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected;
determining a final COD value of the liquid to be detected according to the first COD and the second COD;
the calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal comprises the following steps:
by passing throughCalculating the turbidity of the liquid to be detected;
wherein,Trubfor the turbidity of the liquid to be detected,for detecting the signal intensity of the infrared light signal when pure water is used, < + > >At any time corresponding to the liquid to be detectediThe signal strength of the time-infrared light signal,aandcsignal intensity for infrared light signal->And turbidity (turbidity)TrubCoefficients of linear relationship between;
the first COD and the second COD are obtained by calculation according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected, and the method comprises the following steps:
by passing throughCalculating to obtain first COD->For detecting the signal intensity of the first ultraviolet light signal received during pure water, < >>At any time corresponding to the liquid to be detectediThe signal intensity of the first path of ultraviolet light signal;
by passing throughCalculating to obtain second COD->For detecting the signal intensity of the second ultraviolet light signal received during pure water, < >>At any time corresponding to the liquid to be detectediThe signal intensity of the second path of ultraviolet light signal;
wherein,KandBis the signal intensityEAnd (3) withCODThe coefficient of the linear relationship between them,Ais turbidityTurbThe influence on the COD of the steel is that,A=(Turb-b)/d，banddis turbidityTurbAnd (3) withACoefficients of linear relationship between.
With reference to the second aspect, in some embodiments, the determining a final COD value of the liquid to be detected according to the first COD and the second COD includes:
by passing throughThe final COD value of the liquid to be tested is determined,PandQfor presetting correction coefficient, ++ >For the first COD>Is the second COD.
With reference to the second aspect, in some embodiments, the wavelengths of the two ultraviolet light signals are 254nm and 275nm, respectively, and the wavelength of one infrared light signal is 880nm.
In a third aspect, embodiments of the present application provide a water quality detection apparatus, including:
the signal receiving module is used for receiving three paths of light source signals, the three paths of light source signals are respectively emitted by different light source signal emitting ends and are received by corresponding light source signal receiving ends after passing through liquid to be detected, and the three paths of light source signals comprise two paths of ultraviolet light signals and one path of infrared light signals;
the intensity determining module is used for determining the signal intensity of the received three paths of light source signals;
the turbidity calculating module is used for calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal;
the COD calculation module is used for calculating to obtain a first COD and a second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected, and determining the final COD value of the liquid to be detected according to the first COD and the second COD;
the turbidity calculation module is specifically used for: by passing throughCalculating the turbidity of the liquid to be detected; wherein, TrubFor the turbidity of the liquid to be detected, +.>For detecting the signal intensity of the infrared light signal received when pure water is present, < >>In order to detect the liquid to be detectediThe signal strength of the infrared light signal received at the moment,aandcsignal intensity for infrared light signal->And turbidity (turbidity)TrubCoefficients of linear relationship between;
the COD calculation module is specifically used for: by passing throughThe first COD was calculated and obtained,for detecting the signal intensity of the first ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of the first path of ultraviolet light signal received at the moment; by->Calculating to obtain second COD->For detecting the signal intensity of the second ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of a second path of ultraviolet light signal received at the moment; wherein,KandBis the signal intensityEAnd (3) withCODThe coefficient of the linear relationship between them,Ais turbidityTurbThe influence on the COD of the steel is that,A=(Turb-b)/d，banddis turbidityTurbAnd (3) withACoefficients of linear relationship between.
Compared with the prior art, the embodiment of the application has the beneficial effects that:
in the embodiment of the application, three light source signals are emitted by three different light source signal emitting ends, wherein the three light source signals comprise two paths of ultraviolet light signals and one path of infrared light signals. And then, calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal. And calculating to obtain a first COD and a second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected, and finally determining the final COD value of the liquid to be detected according to the first COD and the second COD.
According to the embodiment of the application, the COD value is determined by adopting two paths of ultraviolet light signals and one path of infrared light signals, the turbidity of the liquid to be detected, which is calculated according to the signal intensity of the infrared light signals, is calculated with the signal intensity of the two paths of ultraviolet light signals to obtain two COD values, and the final COD value is determined according to the two COD values, so that the influence of the turbidity on the COD value is considered, the COD values obtained by ultraviolet light detection with two different wavelengths are also synthesized, and the single wavelength is difficult to adapt to more complex water quality environments, so that the turbidity detection precision is good in the water quality environments with unstable water quality and complex pollutants through the two different wavelengths, and the accuracy of detecting the COD value is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a water quality detecting apparatus according to an embodiment of the present application;
FIG. 2 is a circuit diagram of a light source generating circuit according to an embodiment of the present application;
FIG. 3 is a circuit diagram of a light source receiving circuit according to an embodiment of the present application;
FIG. 4 is a schematic flow chart of a water quality detection method according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a water quality detection device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in this specification and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
In addition, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
Referring to fig. 1, a water quality detection apparatus 10 provided in an embodiment of the present application may include three light source signal transmitting ends 11, three light source signal receiving ends 12, and a processor 13.
The three light source signal transmitting ends 11 are used for generating three light source signals, and the three light source signals reach the corresponding light source signal receiving ends 12 after passing through the liquid to be detected; the three light source signal receiving terminals 12 are configured to receive corresponding light source signals, and convert the three light source signals into voltage signals and send the voltage signals to the processor 13. In this embodiment of the application, the three paths of light source signals may include two paths of ultraviolet light signals and one path of infrared light signals, and the water quality of the liquid to be detected is detected through the two paths of ultraviolet light signals and the one path of infrared light signals.
The middle area of the water quality detection device 10 is a groove structure, the groove structure is a liquid flowing area, the liquid to be detected flows through the liquid flowing area, the light source signal transmitting end 11 and the light source signal receiving end 12 are arranged on the upper side and the lower side of the groove structure, and the light signal transmitted by the light source signal transmitting end 11 is received by the light source signal receiving end 12 after passing through the liquid to be detected.
After the processor 12 receives the voltage signals generated by the three light source signal receiving ends 12, the following steps are implemented to detect the water quality: determining the signal strength of the received three paths of light source signals according to the voltage signals; calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal; calculating to obtain a first COD and a second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected; and determining the final COD value of the liquid to be detected according to the first COD and the second COD.
Specifically, the specific implementation process of calculating the turbidity of the liquid to be detected by the processor 12 according to the signal intensity of the infrared light signal may include: by passing throughThe turbidity of the liquid to be detected is calculated. Wherein,Trubfor turbidity of the liquid to be detected, +.>For detecting the signal intensity of the infrared light signal received when pure water is present, < >>In order to detect the liquid to be detectediThe signal strength of the infrared light signal received at the moment,aandcsignal intensity for infrared light signal->And turbidity (turbidity)TrubCoefficients of linear relationship between. For the followingaAndccan be detected by testing two standard liquids of known turbidityAnd->To determine.
Specifically, the specific implementation process of calculating the first COD and the second COD by the processor 13 according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected may include:
by passing throughCalculating to obtain first COD->For detecting the signal intensity of the first ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of the first path of ultraviolet light signal received at the moment;
by passing throughCalculating to obtain second COD->For detecting the signal intensity of the second ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detected iThe signal intensity of a second path of ultraviolet light signal received at the moment;
wherein,K 1 andB 1 is the signal intensityEAnd (3) withCOD 1 The coefficient of the linear relationship between them,K 2 andB 2 is the signal intensityEAnd (3) withCOD 2 The coefficient of the linear relationship between them,Ais turbidityTurbThe influence on the COD of the steel is that,A=(Turb-b)/d，banddis turbidityTurbAnd (3) withACoefficients of linear relationship between. Wherein for the followingK 1 AndB 1 two known methods can be testedCODDetected by standard liquids of (2)And->Calculating to obtain; for the followingK 2 AndB 2 two known methods can be testedCODIs detected by the standard liquid of (2)>And->Calculating to obtain; for the followingbAnddcan pass 2 pairs of known A and B of two standard liquidsTurbAnd (5) calculating to obtain the product.
For example, the specific implementation process of determining the final COD value of the liquid to be detected by the processor 13 according to the first COD and the second COD may include: by passing throughThe final COD value of the liquid to be tested is determined,PandQfor presetting correction coefficient, ++>For the first COD>Is the second COD. Wherein,PandQcan be tested by testing the final COD value of two standard liquids,COD 1 AndCOD 2 and (5) calculating to obtain the product.
In the embodiment of the application, the wavelengths of two paths of ultraviolet light signals can be 254nm and 275nm respectively, and the wavelength of one path of infrared light signal is 880nm. That is, the turbidity of the liquid to be detected is determined by the signal intensity of the infrared light signal of 880nm wavelength, the first COD is determined by the signal intensity and turbidity of the ultraviolet light signal of 254nm wavelength, and the second COD is determined by the signal intensity and turbidity of the ultraviolet light signal of 275nm wavelength.
It should be noted that, the specific examples of the wavelengths of the two ultraviolet light signals and the wavelengths of the infrared light signals are merely illustrative, and the wavelengths of the two ultraviolet light signals in the embodiments of the present application cannot be limited to 254nm and 275nm, the wavelengths of the infrared light signals are limited to 880nm, and the ultraviolet light signals and the infrared light signals with other wavelengths can also realize the present application, which also belongs to the protection scope of the present application.
Fig. 1 is merely an example of a water quality testing apparatus 10 and is not limiting of the water quality testing apparatus and may include more or fewer components than shown, or may combine certain components, or may be different components, such as input-output devices, network access devices, etc.
The processor 13 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
In addition, the water quality testing apparatus 10 may also include a memory. The memory may be an internal storage unit of the water quality detecting apparatus 10, or may be an external storage device of the water quality detecting apparatus 10, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like. The memory is used for storing computer programs corresponding to the steps executed by the processor 13 and other programs and data required by the water quality detection apparatus 10. The memory may also be used to temporarily store data that has been output or is to be output.
The light source signal transmitting end and the light source signal receiving end are described in detail below.
Referring to fig. 2, each light source signal transmitting terminal may include a light source generating circuit, which may include: the light source, the first amplifier U2, the triode Q1, the analog switch U1, the first resistor R1 to the sixth resistor R6 and the first capacitor C1.
The public switch port (4 pins of U1 in FIG. 2) of the analog switch U1 is connected with an external power supply VERF through a first resistor R1, and the public point of the public switch port of the analog switch U1 and the first resistor R1 is grounded through a second resistor R2; the switch selection port of the analog switch U1 (pin 6 of U1 in fig. 2) is connected to the third resistor R3 and to a control signal (which may come from the processor 13) via the third resistor R3; the normally open switch port (1 pin of U1 in figure 2) of the analog switch U1 is connected with the normal phase input end of the first amplifier U2, and the common point of the normally open switch port of the analog switch U1 and the normal phase input end of the first amplifier U2 is grounded through a fourth resistor; the ground port of the analog switch U1 (pin 2 of U1 in fig. 2) is grounded, and the power port of the analog switch U1 (pin 5 of U1 in fig. 2) is connected to the external power VCC. The pin 3 of U1 in FIG. 2 is a normally closed switch port.
The output end of the first amplifier U2 is connected with the base electrode of the triode Q1 through a fifth resistor R5, the inverting input end of the first amplifier U2 is connected with the emitter electrode of the triode Q1, the inverting input end of the first amplifier U2 is grounded with the emitter electrode of the triode Q1 through a sixth resistor R6, and the power supply end of the first amplifier U2 is connected with an external power supply VCC and is connected with the grounding port of the analog switch U1 through a first capacitor C1.
The collector of the triode Q1 is connected with a light source.
The light source generating circuit VREF may be a reference voltage (for example, 2.5V) obtained by a reference chip. When the light source needs to be lightened, the 4 pin and the 1 pin of the analog switch U1 can be conducted through control signals, the reference voltage VREF is provided for the non-inverting input end of the first amplifier U2, and the reference voltage can be output by the output end of the first amplifier U2 through the 'virtual short' principle of the first amplifier U2. At this time, the triode Q1 is turned on, so that the output end of the first amplifier U2 is communicated with the inverting input end, and the reference voltage VREF is transmitted to the inverting input end, so that the voltages of the non-inverting input end and the inverting input end of the first amplifier U2 are equal. The inverting input terminal of the first amplifier U2 is connected to the sixth resistor R6, and the divided voltage of the sixth resistor R6 is equal to the voltage of the inverting input terminal of the first amplifier U2 and the voltage of the non-inverting input terminal of the first amplifier U2, which are both the reference voltages VREF. Since the partial voltage of the sixth resistor R6 is fixed and the resistor R6 is also fixed, the current flowing through the light source is a constant value, thereby enabling the light source to stably output an optical signal having almost constant intensity.
The light source may be an ultraviolet light source or an infrared light source, for example. Specifically, for the light source signal emitting end corresponding to the ultraviolet light signal, the light source is an ultraviolet light source, for example, a light source capable of generating ultraviolet light with a wavelength of 254nm or 275 nm. For the light source signal emitting end corresponding to the infrared light signal, the light source is an infrared light source, for example, a light source capable of generating infrared light with a wavelength of 880 nm.
In this embodiment, the circuit forms of the light source generating circuits in the three light source signal transmitting terminals are the same, as shown in fig. 2. By arranging the light source in the light source generating circuit, the corresponding ultraviolet light signal or infrared light signal can be stably generated. For example, if the light source in the light source generating circuit is set to a light source capable of generating ultraviolet light having a wavelength of 254nm or 275nm, the light source in the light source generating circuit can emit ultraviolet light having a wavelength of 254nm or 275 nm. For another example, if the light source in the light source generating circuit is set to a light source capable of generating infrared light having a wavelength of 880nm, the light source in the light source generating circuit can emit infrared light having a wavelength of 880 nm.
Referring to fig. 3, each light source signal receiving terminal may include a light source receiving circuit, which may include a receiving photocell, a second amplifier U3, a third amplifier U4, seventh to eleventh resistors R7 to R11, and second to sixth capacitors C2 to C6.
The receiving photocell is connected with the inverting input end of the second amplifier U3, the non-inverting input end of the second amplifier U3 is grounded, the inverting input end of the second amplifier U3 is connected with the output end of the second amplifier U3 through a second capacitor C2 and a seventh resistor R7 which are connected in parallel, the output end of the second amplifier U3 is connected with the inverting input end of the third amplifier U4 through an eighth resistor R8, and the power supply end of the second amplifier U3 is connected with an external power supply.
The non-inverting input end of the third amplifier U4 is grounded through a ninth resistor R9, the inverting input end of the third amplifier U4 is connected with the output end of the third amplifier U4 through a third capacitor C3 and a tenth resistor R10 which are connected in parallel, and two power supplies of the third amplifier U4 are connected with an external power supply and are grounded through a fourth capacitor C4 and a fifth capacitor C5 respectively.
The output end of the third amplifier U4 is connected with the signal output end of the light source receiving circuit through an eleventh resistor R11, and the common point between the eleventh resistor R11 and the signal output end of the light source receiving circuit is grounded through a sixth capacitor R6.
The light source receiving circuit is characterized in that after the light source signal transmitting end transmits ultraviolet light or infrared light, the receiving photocell can receive the signal of the ultraviolet light or the infrared light, and then the receiving photocell generates a current signal I which is in direct proportion to the light intensity. The current signal I passes into the inverting input of the second amplifier U3, the second amplifier U3 forming a transimpedance amplifier, eventually generating a voltage u= -i×r7 at the output of the second amplifier U3. The voltage signal is reversely amplified by the third amplifier U4, then the positive voltage signal is output by the output end of the third amplifier U4, and is output after being protected by the eleventh resistor R11, the voltage signal can be converted into a digital signal by the ADC chip and then sent to the processor, and the signal strength can be obtained E。
In this embodiment, the circuit forms of the light source receiving circuits in the three light source signal receiving terminals are the same, as shown in fig. 3. Each light source signal receiving end corresponds to one light source signal transmitting end, and a light source receiving circuit in the light source signal receiving end converts a light source signal transmitted by the light source signal transmitting end into a voltage signal, converts the voltage signal into a digital signal and transmits the digital signal to the processor.
According to the water quality detection equipment, three light source signals are emitted by three different light source signal emitting ends, wherein the three light source signals comprise two paths of ultraviolet light signals and one path of infrared light signals. And then, the processor calculates the turbidity of the liquid to be detected according to the signal intensity of the infrared light signals, calculates the first COD and the second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected, and finally determines the final COD value of the liquid to be detected according to the first COD and the second COD. According to the embodiment of the application, the COD value is determined by adopting two paths of ultraviolet light signals and one path of infrared light signals, the turbidity of the liquid to be detected, which is calculated according to the signal intensity of the infrared light signals, is calculated with the signal intensity of the two paths of ultraviolet light signals to obtain two COD values, and the final COD value is determined according to the two COD values, so that the influence of the turbidity on the COD value is considered, the COD values obtained by ultraviolet light detection with two different wavelengths are integrated, and the accuracy of detecting the COD value can be improved.
The water quality detection method according to the embodiment of the present application will be described below with reference to fig. 1 to 3. The water quality detection method in the embodiment of the application is realized based on the water quality detection equipment, and can be specifically executed in a processor of the water quality detection equipment.
Referring to fig. 4, the water quality detection method is described in detail as follows:
in step 201, a three-way light source signal is received.
The three paths of light source signals are respectively emitted by different light source signal emitting ends, are received by corresponding light source signal receiving ends after passing through liquid to be detected, and comprise two paths of ultraviolet light signals and one path of infrared light signals.
Step 202, determining the signal strength of the received three-way light source signal.
And 203, calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal.
Illustratively, the calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal may include: by passing throughAnd calculating the turbidity of the liquid to be detected. Wherein,Trubfor turbidity of the liquid to be detected, +.>For detecting the signal intensity of the infrared light signal received when pure water is present, < >>In order to detect the liquid to be detectediThe signal strength of the infrared light signal received at the moment, aAndcsignal intensity for infrared light signal->And turbidity (turbidity)TrubCoefficients of linear relationship between.
And 204, calculating to obtain a first COD and a second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected.
The calculating to obtain the first COD and the second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected may include:
by passing throughCalculating to obtain first COD->For detecting the signal intensity of the first ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of the first path of ultraviolet light signal received at the moment;
by passing throughCalculating to obtain second COD->For detecting the signal intensity of the second ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediAnd the signal intensity of the second path of ultraviolet light signal received at the moment.
Wherein,K 1 andB 1 is the signal intensityEAnd (3) withCOD 1 The coefficient of the linear relationship between them,K 2 andB 2 is the signal intensityEAnd (3) withCOD 2 The coefficient of the linear relationship between them,Ais turbidityTurbThe influence on the COD of the steel is that,A=(Turb-b)/d，banddis turbidityTurbAnd (3) withACoefficients of linear relationship between.
Step 205, determining the final COD value of the liquid to be detected according to the first COD and the second COD.
Illustratively, the determining the final COD value of the liquid to be detected according to the first COD and the second COD may include: by passing throughThe final COD value of the liquid to be tested is determined,PandQfor presetting correction coefficient, ++>For the first COD>Is the second COD.
According to the water quality detection method, three light source signals are emitted by three different light source signal emitting ends, wherein the three light source signals comprise two paths of ultraviolet light signals and one path of infrared light signals. And then, calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal. And calculating to obtain a first COD and a second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected, and finally determining the final COD value of the liquid to be detected according to the first COD and the second COD. According to the embodiment of the application, the COD value is determined by adopting two paths of ultraviolet light signals and one path of infrared light signals, the turbidity of the liquid to be detected, which is calculated according to the signal intensity of the infrared light signals, is calculated with the signal intensity of the two paths of ultraviolet light signals to obtain two COD values, and the final COD value is determined according to the two COD values, so that the influence of the turbidity on the COD value is considered, the COD values obtained by ultraviolet light detection with two different wavelengths are integrated, and the accuracy of detecting the COD value can be improved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
Corresponding to the water quality detection method described in the above embodiments, fig. 5 shows a block diagram of the water quality detection apparatus provided in the embodiments of the present application, and for convenience of explanation, only the portions related to the embodiments of the present application are shown.
Referring to fig. 5, the water quality detection apparatus in the embodiment of the present application may include a signal receiving module 301, an intensity determining module 302, a turbidity calculating module 303, and a COD calculating module 304.
The signal receiving module 301 is configured to receive three light source signals, where the three light source signals are respectively emitted by different light source signal emitting ends, and received by corresponding light source signal receiving ends after passing through the liquid to be detected, and the three light source signals include two ultraviolet light signals and one infrared light signal.
The intensity determination module 302 is configured to determine signal intensities of the received three-way light source signals.
The turbidity calculating module 303 is configured to calculate the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal.
The COD calculation module 304 is configured to calculate a first COD and a second COD according to the signal intensities of the two ultraviolet light signals and the turbidity of the liquid to be detected, and determine a final COD value of the liquid to be detected according to the first COD and the second COD.
Optionally, the turbidity calculation module 303 is specifically configured to:
by passing throughCalculating the turbidity of the liquid to be detected;
wherein,Trubfor the turbidity of the liquid to be detected,for detecting the signal intensity of the infrared light signal received when pure water is present, < >>In order to detect the liquid to be detectediThe signal strength of the infrared light signal received at the moment,aandcsignal intensity for infrared light signal->And turbidity (turbidity)TrubCoefficients of linear relationship between.
Optionally, the COD calculation module 304 is specifically configured to:
by passing throughCalculation ofObtaining the first COD->For detecting the signal intensity of the first ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of the first path of ultraviolet light signal received at the moment;
by passing throughCalculating to obtain second COD->For detecting the signal intensity of the second ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of a second path of ultraviolet light signal received at the moment;
Wherein,KandBis the signal intensityEAnd (3) withCODThe coefficient of the linear relationship between them,Ais turbidityTurbThe influence on the COD of the steel is that,A=(Turb-b)/d，banddis turbidityTurbAnd (3) withACoefficients of linear relationship between.
Optionally, the COD calculation module 304 is specifically configured to: by passing throughThe final COD value of the liquid to be tested is determined,PandQis a preset correction coefficient.
It should be noted that, because the content of information interaction and execution process between the above devices/units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (8)
1. A water quality testing apparatus, comprising: three light source signal transmitting ends, three light source signal receiving ends and a processor;
the three light source signal transmitting ends are used for generating three light source signals, the three light source signals reach the three light source signal receiving ends after passing through the liquid to be detected, and the three light source signals comprise two paths of ultraviolet light signals and one path of infrared light signals;
the three light source signal receiving ends are used for receiving corresponding light source signals, converting the three light source signals into voltage signals and sending the voltage signals to the processor;
the processor receives the voltage signal and implements the steps of:
Determining the signal strength of the received three paths of light source signals according to the voltage signals;
calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal;
calculating to obtain a first COD and a second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected;
determining a final COD value of the liquid to be detected according to the first COD and the second COD;
the calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal comprises the following steps:
by passing throughCalculating the turbidity of the liquid to be detected;
wherein,Trubfor the turbidity of the liquid to be detected,for detecting the signal intensity of the infrared light signal received when pure water is present, < >>In order to detect the liquid to be detectediThe signal strength of the infrared light signal received at the moment,aandcsignal intensity for infrared light signal->And turbidity (turbidity)TrubCoefficients of linear relationship between;
the first COD and the second COD are obtained by calculation according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected, and the method comprises the following steps:
by passing throughCalculating to obtain first COD->For detecting the signal intensity of the first ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detected iThe signal intensity of the first path of ultraviolet light signal received at the moment;
by passing throughCalculating to obtain second COD->For detecting the signal intensity of the second ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of a second path of ultraviolet light signal received at the moment;
wherein,KandBis the signal intensityEAnd (3) withCODThe coefficient of the linear relationship between them,Ais turbidityTurbThe influence on the COD of the steel is that,A=(Turb-b)/d，banddis turbidityTurbAnd (3) withACoefficients of linear relationship between.
2. The water quality testing apparatus of claim 1, wherein each light source signal emitting end comprises a light source generating circuit, the light source generating circuit comprising: the light source, the first amplifier, the triode, the analog switch, the first resistor, the sixth resistor and the first capacitor;
the common switch port of the analog switch is connected with an external power supply VERF through a first resistor, and the common point of the common switch port of the analog switch and the first resistor is grounded through a second resistor; the switch selection port of the analog switch is connected with the third resistor and is connected with the control signal through the third resistor; the normally open switch port of the analog switch is connected with the normal phase input end of the first amplifier, and the common point of the normally open switch port of the analog switch and the normal phase input end of the first amplifier is grounded through a fourth resistor; the grounding port of the analog switch is grounded, and the power port of the analog switch is connected with an external power supply VCC;
The output end of the first amplifier is connected with the base electrode of the triode through a fifth resistor, the inverting input end of the first amplifier is connected with the emitter electrode of the triode, the inverting input end of the first amplifier is grounded with the emitter electrode of the triode through a sixth resistor, and the power supply end of the first amplifier is connected with an external power supply VCC and is connected with the grounding port of the analog switch through a first capacitor;
the collector of the triode is connected with the light source.
3. The water quality testing apparatus of claim 1, wherein each light source signal receiving end comprises a light source receiving circuit comprising a receiving photocell, a second amplifier, a third amplifier, seventh to eleventh resistors, and second to sixth capacitors;
the receiving photocell is connected with the inverting input end of the second amplifier, the non-inverting input end of the second amplifier is grounded, the inverting input end of the second amplifier is connected with the output end of the second amplifier through a second capacitor and a seventh resistor which are connected in parallel, the output end of the second amplifier is connected with the inverting input end of the third amplifier through an eighth resistor, and the power supply end of the second amplifier is connected with an external power supply;
the non-inverting input end of the third amplifier is grounded through a ninth resistor, the inverting input end of the third amplifier is connected with the output end of the third amplifier through a third capacitor and a tenth resistor which are connected in parallel, and two power supplies of the third amplifier are connected with an external power supply and are grounded through a fourth capacitor and a fifth capacitor respectively;
The output end of the third amplifier is connected with the signal output end of the light source receiving circuit through an eleventh resistor, and a common point between the eleventh resistor and the signal output end of the light source receiving circuit is grounded through a sixth capacitor.
4. The water quality testing apparatus of claim 1, wherein the two ultraviolet light signals have wavelengths of 254nm and 275nm, respectively, and the one infrared light signal has a wavelength of 880nm.
5. A water quality testing method, comprising:
receiving three paths of light source signals, wherein the three paths of light source signals are respectively emitted by different light source signal emitting ends and are received by corresponding light source signal receiving ends after passing through liquid to be detected, and the three paths of light source signals comprise two paths of ultraviolet light signals and one path of infrared light signals;
determining the signal strength of the received three paths of light source signals;
calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal;
calculating to obtain a first COD and a second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected;
determining a final COD value of the liquid to be detected according to the first COD and the second COD;
the calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal comprises the following steps:
By passing throughCalculating the turbidity of the liquid to be detected;
wherein,Trubfor the turbidity of the liquid to be detected,for detecting the signal intensity of the infrared light signal received when pure water is present, < >>In order to detect the liquid to be detectediThe signal strength of the infrared light signal received at the moment,aandcsignal intensity for infrared light signal->And turbidity (turbidity)TrubCoefficients of linear relationship between;
the first COD and the second COD are obtained by calculation according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected, and the method comprises the following steps:
by passing throughCalculating to obtain first COD->For detecting the signal intensity of the first ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of the first path of ultraviolet light signal received at the moment;
by passing throughCalculating to obtain second COD->For detecting the signal intensity of the second ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of a second path of ultraviolet light signal received at the moment;
wherein,KandBis the signal intensityEAnd (3) withCODThe coefficient of the linear relationship between them,Ais turbidityTurbThe influence on the COD of the steel is that,A=(Turb-b)/d，banddis turbidityTurbAnd (3) withACoefficients of linear relationship between.
6. The water quality testing method according to claim 5, wherein determining the final COD value of the liquid to be tested based on the first COD and the second COD comprises:
By passing throughThe final COD value of the liquid to be tested is determined,PandQfor presetting correction coefficient, ++>For the first COD>Is the second COD.
7. The water quality testing method according to claim 5, wherein the wavelength of the two ultraviolet light signals is 254nm and 275nm, respectively, and the wavelength of the one infrared light signal is 880nm.
8. A water quality testing device, comprising:
the signal receiving module is used for receiving three paths of light source signals, the three paths of light source signals are respectively emitted by different light source signal emitting ends and are received by corresponding light source signal receiving ends after passing through liquid to be detected, and the three paths of light source signals comprise two paths of ultraviolet light signals and one path of infrared light signals;
the intensity determining module is used for determining the signal intensity of the received three paths of light source signals;
the turbidity calculating module is used for calculating the turbidity of the liquid to be detected according to the signal intensity of the infrared light signal;
the COD calculation module is used for calculating to obtain a first COD and a second COD according to the signal intensity of the two paths of ultraviolet light signals and the turbidity of the liquid to be detected, and determining the final COD value of the liquid to be detected according to the first COD and the second COD;
the turbidity calculation module is specifically used for: by passing through Calculating the turbidity of the liquid to be detected; wherein,Trubfor the turbidity of the liquid to be detected, +.>For detecting the signal intensity of the infrared light signal received when pure water is present, < >>In order to detect the liquid to be detectediThe signal strength of the infrared light signal received at the moment,aandcsignal intensity for infrared light signal->And turbidity (turbidity)TrubCoefficients of linear relationship between;
the COD calculation module is specifically used for: by passing throughCalculating to obtain first COD->For detecting the signal intensity of the first ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of the first path of ultraviolet light signal received at the moment; by->Calculating to obtain second COD->For detecting the signal intensity of the second ultraviolet light signal received during pure water, < >>In order to detect the liquid to be detectediThe signal intensity of a second path of ultraviolet light signal received at the moment; wherein,KandBis the signal intensityEAnd (3) withCODThe coefficient of the linear relationship between them,Ais turbidityTurbThe influence on the COD of the steel is that,A=(Turb-b)/d，banddis turbidityTurbAnd (3) withACoefficients of linear relationship between.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011158340A (en) * | 2010-01-29 | 2011-08-18 | Nippon Steel Corp | Concentration measuring method, detecting method and apparatus for specific chemical substance in drainage or specific drainage and device |
| CN103983595A (en) * | 2014-05-27 | 2014-08-13 | 重庆大学 | Water quality turbidity calculating method based on ultraviolet-visible spectroscopy treatment |
| CN104849238A (en) * | 2015-06-10 | 2015-08-19 | 浙江诸暨奇创电子科技有限公司 | Infrared turbidity detection device |
| CN105717072A (en) * | 2016-04-14 | 2016-06-29 | 天津视讯云光电科技有限公司 | Transmission type COD (chemical oxygen demand) detection device based on reflecting mirror |
| US20170115260A1 (en) * | 2015-03-09 | 2017-04-27 | Jiade Yu | Both Ultraviolet-Visible and Double Monochromatic Fluorescence Dual Detector for High Performance Liquid Chromatography |
| CN106644974A (en) * | 2016-10-10 | 2017-05-10 | 深圳市比特原子科技有限公司 | Water quality detection device and water quality detection method |
| CN209858408U (en) * | 2019-03-06 | 2019-12-27 | 深圳市智水小荷技术有限公司 | Water quality detection equipment |
| CN110687047A (en) * | 2019-10-22 | 2020-01-14 | 上海观流智能科技有限公司 | Multi-light-source device for COD measurement and detection method |
| CN111189804A (en) * | 2020-03-17 | 2020-05-22 | 威海精讯畅通电子科技有限公司 | Turbidity detector and detection method |
| US20200278292A1 (en) * | 2019-02-28 | 2020-09-03 | Yokogawa Electric Corporation | Turbidity measurement method and turbidimeter |
| CN214845229U (en) * | 2021-07-31 | 2021-11-23 | 哈尔滨理工大学 | Enterprise sewage discharge monitoring device |
| CN114002168A (en) * | 2021-08-04 | 2022-02-01 | 河北雄安华清宏远环境科技有限公司 | Method and device for detecting liquid concentration by eliminating turbidity difference |
| CN219694920U (en) * | 2023-03-31 | 2023-09-15 | 张家港宏昌钢板有限公司 | Industrial water turbidity detection device |
-
2023
- 2023-12-19 CN CN202311744486.5A patent/CN117420092B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011158340A (en) * | 2010-01-29 | 2011-08-18 | Nippon Steel Corp | Concentration measuring method, detecting method and apparatus for specific chemical substance in drainage or specific drainage and device |
| CN103983595A (en) * | 2014-05-27 | 2014-08-13 | 重庆大学 | Water quality turbidity calculating method based on ultraviolet-visible spectroscopy treatment |
| US20170115260A1 (en) * | 2015-03-09 | 2017-04-27 | Jiade Yu | Both Ultraviolet-Visible and Double Monochromatic Fluorescence Dual Detector for High Performance Liquid Chromatography |
| CN104849238A (en) * | 2015-06-10 | 2015-08-19 | 浙江诸暨奇创电子科技有限公司 | Infrared turbidity detection device |
| CN105717072A (en) * | 2016-04-14 | 2016-06-29 | 天津视讯云光电科技有限公司 | Transmission type COD (chemical oxygen demand) detection device based on reflecting mirror |
| CN106644974A (en) * | 2016-10-10 | 2017-05-10 | 深圳市比特原子科技有限公司 | Water quality detection device and water quality detection method |
| US20200278292A1 (en) * | 2019-02-28 | 2020-09-03 | Yokogawa Electric Corporation | Turbidity measurement method and turbidimeter |
| CN209858408U (en) * | 2019-03-06 | 2019-12-27 | 深圳市智水小荷技术有限公司 | Water quality detection equipment |
| CN110687047A (en) * | 2019-10-22 | 2020-01-14 | 上海观流智能科技有限公司 | Multi-light-source device for COD measurement and detection method |
| CN111189804A (en) * | 2020-03-17 | 2020-05-22 | 威海精讯畅通电子科技有限公司 | Turbidity detector and detection method |
| CN214845229U (en) * | 2021-07-31 | 2021-11-23 | 哈尔滨理工大学 | Enterprise sewage discharge monitoring device |
| CN114002168A (en) * | 2021-08-04 | 2022-02-01 | 河北雄安华清宏远环境科技有限公司 | Method and device for detecting liquid concentration by eliminating turbidity difference |
| CN219694920U (en) * | 2023-03-31 | 2023-09-15 | 张家港宏昌钢板有限公司 | Industrial water turbidity detection device |
Non-Patent Citations (1)
| Title |
|---|
| 罗继阳: "水质COD检测用光谱法的水体环境浊度解算方法", 《环境科学与技术》, no. 2, 15 December 2015 (2015-12-15) * |
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