CN107941723A - A kind of double light source measurement device and methods of COD - Google Patents
A kind of double light source measurement device and methods of COD Download PDFInfo
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- CN107941723A CN107941723A CN201711382407.5A CN201711382407A CN107941723A CN 107941723 A CN107941723 A CN 107941723A CN 201711382407 A CN201711382407 A CN 201711382407A CN 107941723 A CN107941723 A CN 107941723A
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- 238000005259 measurement Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004020 luminiscence type Methods 0.000 claims abstract description 78
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- 230000029087 digestion Effects 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims description 15
- 201000009310 astigmatism Diseases 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 12
- 238000002835 absorbance Methods 0.000 description 7
- 239000002253 acid Substances 0.000 description 4
- 239000012286 potassium permanganate Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- NOMZRECDBIBSDZ-UHFFFAOYSA-L potassium;sodium;oxalate Chemical compound [Na+].[K+].[O-]C(=O)C([O-])=O NOMZRECDBIBSDZ-UHFFFAOYSA-L 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 description 1
- 229940039790 sodium oxalate Drugs 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000003403 water pollutant Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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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
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
-
- 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
-
- 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]
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Toxicology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Biomedical Technology (AREA)
- Emergency Medicine (AREA)
- Molecular Biology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses double light source measurement device and methods of COD a kind of, including the first luminescence component, the second luminescence component, semi-transparent semi-reflecting lens, digestion tube, the first photodetector and the second photodetector；First luminescence component and the second luminescence component are mutually perpendicular to, respectively positioned at the both sides of the semi-transparent semi-reflecting lens, the two alternation；First photodetector and the second photodetector are oppositely arranged with the first luminescence component and the second luminescence component respectively；The emergent light of first luminescence component and the second luminescence component is incident to semi-transparent semi-reflecting lens respectively, and energy equal transmitted light and reflected light are divided into after semi-transparent semi-reflecting lens；Wherein, the reflected light of the first luminescence component and the transmitted light of the second luminescence component are incident to the first optical detector surface respectively；The transmitted light of first luminescence component and the reflected light of the second luminescence component reenter after digestion tube is incident upon the second optical detector surface.The present invention can exclude the interference that light source change produces, so as to improve measurement accuracy.
Description
Technical field
Present invention relates particularly to double light source measurement device and methods of COD a kind of.
Background technology
COD (COD) is a kind of composite target of common evaluation degree of water pollution, and COD is higher, pollution
It is more serious, therefore, water pollutant index of the China using COD as priority control.Measured using liquor potassic permanganate as oxidant
COD, is formerly referred to as manganese method COD, and in the new aquatic environment standard in China, the value is called permanganate index,
For characterizing surface water, drinking water and the COD of sanitary sewage.Traditional permanganate index measuring method is that sulphur is added in water sample
Acid makes after being in acid, adds a certain amount of liquor potassic permanganate, and the heating reaction certain time in waste water bath, remaining Gao Meng
Sour potassium sodium oxalate solution reduces and adds excess, then with potassium permanganate solution residual titration excess sodium oxalate, height is obtained by calculating
Violent acid potassium index numerical value.This method measurement result is more accurate, suitable for laboratory place.But for on-line computing model
For device, such a method and step is relatively complicated, is related to repeatedly adding reagent and titration, constructional device is also more complicated.Thus
It is simple to find a kind of step, device is easy, measures accurate permanganate index measuring method, is ten for online monitoring instruments
Divide what is be necessary.
The content of the invention
In view of the above-mentioned problems, the present invention proposes a kind of double light source measurement device and methods of COD, it is using light splitting light
Degree method, the basic principle of spectrophotometry is langbobier law, and what is measured under normal conditions is transmitted intensity, transmitted light intensity
The change of degree and solution concentration c, printing opacity thickness L is related, and K is molar absorption coefficient, and mathematic(al) representation is as follows：
Wherein, A is absorbance, I0Represent reference light intensity, ItRepresent to pass through the measurement luminous intensity after solution.
Every group of light source can all obtain a signal value and a reference value, and the ratio of the two values is first taken when we are handled,
Reduced value seeks logarithm again, so obtains the absorbance of solution, then by calibration, establish absorbance and the linear of solution concentration is closed
System, measured value is obtained by this relational expression.Meanwhile if light source produces change, the signal value that we obtain and reference value
Can respective change, due to ask be the two values ratio, so light source change produce interference will be excluded.
Realize above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions：
Double light source measurement devices of COD a kind of, including the first luminescence component, the second luminescence component, semi-transparent semi-reflecting lens, resolution
Pipe, the first photodetector and the second photodetector；
First luminescence component and the second luminescence component are mutually perpendicular to, respectively positioned at the both sides of the semi-transparent semi-reflecting lens；
First photodetector and the second photodetector respectively with the first luminescence component and the second luminescence component phase
To setting；
The emergent light of first luminescence component and the second luminescence component is incident to semi-transparent semi-reflecting lens respectively, by semi-transparent half
It is divided into energy equal transmitted light and reflected light after anti-mirror；Wherein, the reflected light of the first luminescence component and the second luminescence component
Transmitted light is incident to the first optical detector surface respectively；The transmitted light of first luminescence component and the reflection of the second luminescence component
Light reenters after digestion tube is incident upon the second optical detector surface.
Further, first luminescence component includes the first measurement light source being sequentially arranged and the first convex lens, described
First convex lens receives the diverging light that the first measurement light source is sent, and is collimated；Second luminescence component includes sequentially setting
The the second measurement light source put and the second convex lens, second convex lens receive the diverging light that the second measurement light source is sent, and will
It is collimated.
Further, the wavelength of the first measurement light source and the second measurement light source is different.
Further, the centre wavelength of the first measurement light source is 535nm；The centre wavelength of the second measurement light source
For 450nm.
Further, the first measurement light source and the second measurement light source work alternatively.
Further, the angle between the semi-transparent semi-reflecting lens and the first luminescence component and the second luminescence component is equal, institute
The angle stated is 45 °.
Further, the convex lens is planoconvex spotlight or biconvex lens.
Further, double light source measurement devices further include signal processing unit；First optical detector and second
Feeding signal processing unit is handled after the optical signal of reception is changed into electric signal by optical detector.
Double light source measuring methods of COD a kind of, comprise the following steps：
(1) first luminescence component, the emergent light alternative expression of the second luminescence component are incident to semi-transparent semi-reflecting lens respectively；
(2) the semi-transparent semi-reflecting lens transmitted light and reflected light equal by energy is divided into after the incident light received；
The reflected light of (3) first luminescence components and the transmitted light of the second luminescence component are incident to the first optical detector table respectively
Face；
The transmitted light of (4) first luminescence components and the reflected light of the second luminescence component reenter after digestion tube and are incident upon
Two optical detector surfaces.
Further, double light source measuring methods of a kind of COD, further include：First detector and the second detector
Signal processing circuit is sent into after the optical signal received is changed into electric signal, processing is compared by signal processing circuit, is obtained
Go out measured value.
Beneficial effects of the present invention：
The present invention provides double light source measurement device and methods of COD a kind of, set in the light path of two kinds of light sources semi-transparent
Semi-reflective mirror, light, which enters, all the way refers to optical detector, and another way light enters measurement optical detector, two light source alternatings by digestion tube
Work, does not interfere with each other, and receiving two groups of optical signals respectively with reference to optical detector and measurement optical detector is changed into electric signal into letter
Number process circuit, obtains more accurate measurement value, foregoing algorithm process is referred to by two groups of signals of algorithm process：Every group
Light source can all obtain a signal value and a reference value, first take the ratio of the two values when we are handled, then reduced value is asked pair
Number, so obtains the absorbance of solution, then by calibration, establishes the linear relationship of absorbance and solution concentration, pass through this pass
It is that formula obtains measured value.Meanwhile if light source produces change, the signal value that we obtain may also change accordingly with reference value, by
In ask be the two values ratio, so light source change produce interference will be excluded.
Brief description of the drawings
Fig. 1 is the structure diagram of an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The application principle of the present invention is explained in detail below in conjunction with the accompanying drawings.
Embodiment 1
As shown in Figure 1, double light source measurement devices of COD a kind of, including it is the first luminescence component, the second luminescence component, semi-transparent
Semi-reflective mirror, digestion tube, the first photodetector, the second photodetector and signal processing unit；
First luminescence component and the second luminescence component are mutually perpendicular to, respectively positioned at the both sides of the semi-transparent semi-reflecting lens,
Angle between the semi-transparent semi-reflecting lens and the first luminescence component and the second luminescence component is equal, and the angle is 45 °, specifically
Referring to Fig. 1；In embodiments of the present invention, first luminescence component includes the first measurement light source being sequentially arranged and the first convex lens
Mirror, first convex lens receives the diverging light that the first measurement light source is sent, and is collimated；Second luminescence component includes
The second measurement light source being sequentially arranged and the second convex lens, second convex lens receive the diverging that the second measurement light source is sent
Light, and collimated；The wavelength of the first measurement light source and the second measurement light source is different, it is preferable that the first measurement light
The centre wavelength in source is 535nm；The centre wavelength of the second measurement light source be 450nm, and described first measures light source and the
Two measurement light sources work alternatively；The convex lens is common collimation lens, can select planoconvex spotlight or biconvex lens, be used for
The diverging light that LED is sent collimates；In the present invention, the measured value of the secondary light source (450nm) is used for the first light source
The measurement result of (535nm) is modified.
First photodetector and the second photodetector respectively with the first luminescence component and the second luminescence component phase
To setting；First optical detector be to measure light signal sensitivity detector, can with detecting instrument instrument used in
Detector it is identical, can also use other to measure light signal sensitivity detectors；
The emergent light of first luminescence component and the second luminescence component is incident to semi-transparent semi-reflecting lens respectively, by semi-transparent half
It is divided into energy equal transmitted light and reflected light after anti-mirror；Wherein, the reflected light of the first luminescence component and the second luminescence component
Transmitted light is incident to the first optical detector surface respectively；The transmitted light of first luminescence component and the reflection of the second luminescence component
Light reenters after digestion tube is incident upon the second optical detector surface；
First optical detector and the second optical detector are sent at signal after the optical signal of reception is changed into electric signal
Reason unit is handled.
In a kind of embodiment of the embodiment of the present invention, the semi-transparent semi-reflecting lens are semi-transparent semi-reflecting eyeglass, by light
Learn coating film on glass to be formed, for function for light beam is divided into two, energy is equal.
Embodiment 2
Double light source measuring methods of COD a kind of, comprise the following steps：
(1) first luminescence component, the emergent light of the second luminescence component are incident to semi-transparent semi-reflecting lens respectively；
(2) the semi-transparent semi-reflecting lens transmitted light and reflected light equal by energy is divided into after the incident light received；
The reflected light of (3) first luminescence components and the transmitted light of the second luminescence component are incident to the first optical detector table respectively
Face；
The transmitted light of (4) first luminescence components and the reflected light of the second luminescence component reenter after digestion tube and are incident upon
Two optical detector surfaces；
The optical signal received is changed into after electric signal by (5) first detectors and the second detector is sent into signal processing electricity
Road, is compared processing by signal processing circuit, draws measured value；The comparison is handled：Every group of light source can all obtain
To a signal value and a reference value, first take the ratio of the two values, then reduced value to seek logarithm when we are handled, so obtain
The absorbance of solution, then by calibration, establish the linear relationship of absorbance and solution concentration, measurement is obtained by this relational expression
Value.Meanwhile if light source produces change, the signal value that we obtain may also change accordingly with reference value, due to ask be this two
The ratio of a value, so the interference that light source change produces will be excluded.
In summary：
Basic principle based on spectrophotometry, acid permanganate soln resolution aoxidize the organic substance in water, utilize
Characteristic absorption measurement potassium permanganate surplus of the potassium permanganate at 535nm, the decrement of potassium permanganate and the consumption of organic matter
Measure directly proportional.In order to improve measuring accuracy and exclude the interference of other materials, present invention introduces the measurement at another group of 450nm
Signal, two kinds of light sources are worked alternatively, not interfere with each other, measurement optical detector receive two kinds of optical signals respectively and be converted into electric signal into
Enter signal processing circuit, then processing is compared by microcontroller, draw measured value, substantially increase measurement accuracy.
The basic principles, main features and the advantages of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
- A kind of 1. double light source measurement devices of COD, it is characterised in that：Including the first luminescence component, the second luminescence component, semi-transparent half Anti- mirror, digestion tube, the first photodetector and the second photodetector；First luminescence component and the second luminescence component are mutually perpendicular to, respectively positioned at the both sides of the semi-transparent semi-reflecting lens；First photodetector and the second photodetector respectively with the first luminescence component and the second luminescence component is opposite sets Put；The emergent light of first luminescence component and the second luminescence component is incident to semi-transparent semi-reflecting lens respectively, by semi-transparent semi-reflecting lens It is divided into energy equal transmitted light and reflected light afterwards；Wherein, the transmission of the reflected light of the first luminescence component and the second luminescence component Light is incident to the first optical detector surface respectively；The transmitted light of first luminescence component and the reflected light warp of the second luminescence component Cross after digestion tube to reenter and be incident upon the second optical detector surface.
- A kind of 2. double light source measurement devices of COD according to claim 1, it is characterised in that：First luminescence component Including the first measurement light source being sequentially arranged and the first convex lens, first convex lens receives the hair that the first measurement light source is sent Astigmatism, and collimated；Second luminescence component includes the second measurement light source and the second convex lens being sequentially arranged, and described the Two convex lenses receive the diverging light that the second measurement light source is sent, and are collimated.
- A kind of 3. double light source measurement devices of COD according to claim 2, it is characterised in that：The first measurement light source It is different with the wavelength of the second measurement light source.
- A kind of 4. double light source measurement devices of COD according to claim 3, it is characterised in that：The first measurement light source Centre wavelength be 535nm；The centre wavelength of the second measurement light source is 450nm.
- A kind of 5. double light source measurement devices of COD according to claim 2, it is characterised in that：The first measurement light source Worked alternatively with the second measurement light source.
- A kind of 6. double light source measurement devices of COD according to claim 1, it is characterised in that：The semi-transparent semi-reflecting lens with Angle between first luminescence component and the second luminescence component is equal, and the angle is 45 °.
- A kind of 7. double light source measurement devices of COD according to claim 2, it is characterised in that：The convex lens is plano-convex Lens or biconvex lens.
- A kind of 8. double light source measurement devices of COD according to claim 1, it is characterised in that：Double light source measurement dresses Put and further include signal processing unit；The optical signal of reception is changed into electric signal by first optical detector and the second optical detector Signal processing unit is sent into afterwards to be handled.
- 9. double light source measuring methods of a kind of COD, it is characterised in that comprise the following steps：(1) first luminescence component, the emergent light alternative expression of the second luminescence component are incident to semi-transparent semi-reflecting lens respectively；(2) the semi-transparent semi-reflecting lens transmitted light and reflected light equal by energy is divided into after the incident light received；The reflected light of (3) first luminescence components and the transmitted light of the second luminescence component are incident to the first optical detector surface respectively；The transmitted light of (4) first luminescence components and the reflected light of the second luminescence component reenter after digestion tube and are incident upon the second light Detector surface.
- 10. double light source measuring methods of a kind of COD according to claim 9, it is characterised in that further include：First detection Device and the second detector are sent into signal processing circuit after the optical signal received is changed into electric signal, by signal processing circuit into Row is relatively handled, and draws measured value.
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| CN201711382407.5A CN107941723A (en) | 2017-12-20 | 2017-12-20 | A kind of double light source measurement device and methods of COD |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884451A (en) * | 2021-09-27 | 2022-01-04 | 乐山师范学院 | Method for measuring chemical oxygen demand in high-chlorine water |
| CN114488538A (en) * | 2022-02-28 | 2022-05-13 | 歌尔股份有限公司 | AR ray apparatus and head-mounted display device |
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