CN112730287A - Method and device for measuring window error correction in full-spectrum water quality detection - Google Patents
Method and device for measuring window error correction in full-spectrum water quality detection Download PDFInfo
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- CN112730287A CN112730287A CN202011544541.2A CN202011544541A CN112730287A CN 112730287 A CN112730287 A CN 112730287A CN 202011544541 A CN202011544541 A CN 202011544541A CN 112730287 A CN112730287 A CN 112730287A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000001228 spectrum Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000012937 correction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims description 17
- 230000007246 mechanism Effects 0.000 claims description 14
- 238000002835 absorbance Methods 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000011481 absorbance measurement Methods 0.000 claims description 5
- 238000011109 contamination Methods 0.000 claims description 4
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 14
- 230000008859 change Effects 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012372 quality testing Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- G—PHYSICS
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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
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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
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
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Abstract
The invention relates to a measuring method and a device for window error correction in full-spectrum water quality detection, belonging to the technical field of water quality detection. The invention can eliminate the error of window pollution on data measurement in full-spectrum water quality detection and improve the accuracy of the full-spectrum water quality detection.
Description
Technical Field
The invention belongs to the technical field of water quality detection, and particularly relates to a method and a device for measuring window error correction in full-spectrum water quality detection.
Background
Compared with the traditional method for measuring water quality by using chemical reagents, the full-spectrum water quality detector has the characteristics of high detection speed, no secondary pollution and the like, and is increasingly applied to water quality monitoring. In the process of detecting water quality by using spectral absorbance measurement in the full-spectrum water quality detector, a window of a light path in contact with water quality to be detected can influence the spectral absorbance due to substances such as particles, microorganisms and the like attached to the surface of the window, and further measurement errors can be caused. The existing full-spectrum water quality detector generally has an automatic cleaning function to maintain the accuracy of water quality detection, the automatic cleaning function generally runs once every several hours or days, but in the interval time of automatic cleaning, the surface of a window in contact with the water quality to be detected still has a certain amount of particles, microorganisms and other substances, and the measurement accuracy of the water quality detector is still influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a measuring method and a device for correcting window error in full-spectrum water quality detection, which can effectively solve the problems, can accurately measure the concentration of a solution to be measured without being influenced by window pollution,
a measurement method for window error correction in full-spectrum water quality detection comprises the following steps:
the method comprises the following steps: measuring and recording the absorbance A at a first measuring position of a first window1，A1Can be expressed as equation 1:
A1＝KCL1+θ
in formula 1, K is the absorption coefficient and refers to the absorbance of a substance at a unit concentration per unit optical path length, C is the concentration of the solution to be measured, and L is1Represents an optical path between the first window and the second window in a state where the first window is located at the first measurement position, and θ represents an absorbance measurement deviation due to window contamination;
step two: the first window is moved in the direction of the light path to a second measuring position for measuring and recording the absorbance A2, A2Can be expressed as equation 2:
A2＝KCL2+θ
in formula 2, L2Indicating the optical path between the first window and the second window in the state that the first window is positioned at the second measuring position.
Step three: and calculating the difference between the formula 2 and the formula 3 to obtain a formula 3:
A1-A2＝KC(L1-L2)
step four: and (4) calculating the formula 3 to obtain the value of the concentration C of the solution to be detected.
A full-spectrum water quality detection window error correction device comprises a light source part, a receiving part and a connecting part; the light source part is telescopically connected with the receiving part by virtue of the connecting part;
the light source part comprises a first window and a light source;
the receiving part comprises a second window and a spectrometer;
the light source, the first window, the second window and the spectrometer are collinear; the first window and the second window are disposed between the light source and the spectrometer.
Preferably, the connecting portion comprises a cavity that is opaque to light; one end of the cavity is communicated with the light source part; one end of the cavity is communicated with the connecting part; the connecting portion is capable of telescoping.
Preferably, the error correction device further comprises a telescoping mechanism; the telescopic mechanism is fixedly connected with the light source part or the receiving part.
Preferably, the telescopic mechanism is a cylinder or a hydraulic cylinder.
Preferably, the error correction device further comprises a slide rail; the light source part or the receiving part is fixed on the sliding rail in a sliding mode.
Has the advantages that: a measuring method for window error correction in full-spectrum water quality detection utilizes the change of optical distances of a first window and a second window to eliminate the error of window pollution on data measurement in the full-spectrum water quality detection and improve the accuracy of the full-spectrum water quality detection. The utility model provides a full gloss register for easy reference water quality testing window error correction device, relies on the flexible connection effect of connecting portion to light source portion and receiving portion, adjusts the interval of first window and second window, adjusts the optical path between first window and the second window, and then utilizes the change of optical path, eliminates the window pollution to the error of data measurement in the full gloss register for easy reference water quality testing.
Drawings
FIG. 1 is a schematic diagram of an error correction measurement process according to the present invention;
FIG. 2 is a schematic structural diagram of an error correction apparatus according to the present invention.
In the figure, 1, a telescopic mechanism; 2. a light source unit; 21. a first window; 22. a light source; 3. a receiving section; 31. a second window; 32. a spectrometer; 4. a connecting portion.
Detailed Description
The invention will be further described with reference to the accompanying drawings, which are provided for illustration of specific embodiments of the invention only and are not to be construed as limiting the invention in any way, the specific embodiments being as follows:
the measurement principle of the invention is as follows:
according to the lambert-beer law, when a beam of parallel monochromatic light passes through a dilute solution containing a light absorbing substance, the absorbance:
A＝KCL
wherein K is absorption coefficient, which refers to the absorbance of a unit concentration substance in unit optical path length, L is the optical path, which is the distance of light passing through the absorption cell, and C is the concentration of the solution to be measured.
According to the formula, the absorption degree of the solution to light is in direct proportion to the concentration of the light absorbing substance, and the full spectrum water quality detector calculates the concentration of a specific component in the solution to be measured, such as COD (chemical oxygen demand) and the like, through the absorption of light in a full spectrum in a measurement spectrum range, which is a basic method for measuring water quality by the existing spectrum method.
The existing measuring method has technical prejudice, the detection accuracy can be realized as long as a window of an optical path contacting with water quality to be detected is kept clean enough, and the higher the cleaning degree is, the higher the detection accuracy is. In addition, the reference light path of the existing full-spectrum water quality detector passes through the inside of the device and cannot be affected by window pollution, but the reference light beam in the reference light path can only correct the light intensity change of the light source and cannot correct the measurement error caused by the window pollution.
As shown in fig. 1, the measurement method of the error correction of the present invention is as follows:
the absorbance is first determined and recorded at a first measurement location in a first window. The absorbance a1 at this time can be expressed as formula 1:
A1＝KCL1+θ
wherein L is1Indicating that the first window is located between the first measuring position and the second windowThe optical path length of (a), θ, represents the deviation of absorbance measurement due to window contamination, which is a quantity independent of the absorption coefficient, concentration and optical path length of the solution to be measured.
Then the first window is moved to a second measuring position along the optical axis direction to measure and record the absorbance A2It can be expressed as formula 2:
A2＝KCL2+θ
wherein L is2Indicating the optical path between the first window and the second window in the state that the first window is positioned at the second measuring position.
And calculating the difference between the formula 2 and the formula 3 to obtain a formula 3:
A1-A2＝KC(L1-L2)
the concentration C of the solution to be measured can be obtained by calculating the formula 3. As can be seen from formula 3, the invention dynamically compensates the influence of window pollution on the measurement result by moving the position of the observation window. The absorbance measurement deviation theta caused by window pollution can be eliminated by calculating through difference, and the concentration C of the solution to be measured, which is not influenced by the window pollution, can be obtained.
As shown in fig. 2, the full spectrum water quality detection window error correction device comprises a telescopic mechanism 1, a light source part 2 and a receiving part 3, wherein the light source part 2 is hermetically connected with the receiving part 3 through a connecting part 4, and the length of the connecting part 4 can be adjusted, so that the distance between the light source part 2 and the receiving part 3 can be adjusted. The connecting portion 4 is a light-tight closed structure with a cavity, and the light path can pass through the cavity of the connecting portion 4 without being blocked, and is not easily interfered by other external light sources. Connecting portion 4 adopts waterproof material, and the quality of water that awaits measuring can not get into connecting portion 4. The connecting part 4 can be a black rubber tube, a telescopic plastic tube and the like. The movable end of the telescopic mechanism 1 is fixedly connected with the light source part 2 and provides moving power for the light source part 2. The telescopic mechanism 1 is preferably a cylinder or a hydraulic cylinder, and other mechanisms that can reciprocate at the same distance, such as a crank mechanism, can be used as the telescopic mechanism 1. The light source section 2 includes a first window 21, a light source 22 disposed in a cavity thereof. The receiving part 3 comprises a second window 31, a spectrometer 32, placed in its cavity. The light source 22 is arranged to the left of the first window 21 and the spectrometer 32 is arranged to the right of the second window 31. The first window 21 and the second window 31 are disposed correspondingly, and the first window 21, the light source 22, the second window 31 and the spectrometer 32 are collinear, so that the measuring light emitted by the light source 22 can simultaneously pass through the first window 21 and the second window 31 and be conducted to the spectrometer 32. A water quality detection area to be detected is arranged between the first window 21 and the second window 31.
In some embodiments, the full spectrum water quality detection window error correction device further includes a slide rail (not shown in the drawings) disposed along the direction of the measurement light path emitted by the light source 22, and the light source 2 is fixed on the slide rail, so that the light source 2 can be limited, the moving direction is ensured, and the resistance during moving is reduced.
In some embodiments, the light source unit 2 is fixed in position, the receiving unit 3 is fixedly connected to the telescopic mechanism 1, and the receiving unit 3 is fixed on the slide rail, so that the distance between the first window 21 and the second window 31 can be adjusted, and the influence of window contamination on the measurement result in the full-spectrum water quality detection can be dynamically compensated by using the change of the optical path.
Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations or modifications which are consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (6)
1. A measurement method for window error correction in full-spectrum water quality detection comprises the following steps:
the method comprises the following steps: measuring and recording the absorbance A at a first measuring position of a first window1，A1Can be expressed as equation 1:
A1＝KCL1+θ
in formula 1, K is the absorption coefficient and refers to the absorbance of a substance at a unit concentration per unit optical path length, C is the concentration of the solution to be measured, and L is1Indicating that the first window is located at the firstMeasuring an optical path between the position state and the second window, wherein theta represents an absorbance measurement deviation caused by window contamination;
step two: moving the first window to a second measuring position along the light path direction to measure and record the absorbance A２，A2Can be expressed as equation 2:
A2＝KCL2+θ
in formula 2, L2Indicating the optical path between the first window and the second window in the state that the first window is positioned at the second measuring position.
Step three: and calculating the difference between the formula 2 and the formula 3 to obtain a formula 3:
A1-A2＝KC(L1-L2)
step four: and (4) calculating the formula 3 to obtain the value of the concentration C of the solution to be detected.
2. A full-spectrum water quality detection window error correction device comprises a light source part (2), a receiving part (3) and a connecting part (4); the light source part (2) is telescopically connected with the receiving part (3) by virtue of the connecting part (4);
the light source section (2) includes a first window (21) and a light source (22);
the receiving part (3) comprises a second window (31) and a spectrometer (32);
the light source (22), first window (21), second window (31) and spectrometer (32) are collinear; the first window (21) and the second window (31) are disposed between the light source (22) and the spectrometer (32).
3. Error correction device according to claim 2, characterized in that the connection (4) comprises a cavity that is light-tight; one end of the cavity is communicated with the light source part (2); one end of the cavity is communicated with the connecting part (4); the connecting part (4) can be extended and retracted.
4. Error correction device according to claim 2, characterized in that the error correction device further comprises a telescopic mechanism (1); the telescopic mechanism (1) is fixedly connected with the light source part (2) or the receiving part (3).
5. Error correction device according to claim 4, characterized in that the telescopic mechanism (1) is a pneumatic or hydraulic cylinder.
6. The error correction device of claim 2, further comprising a slide; the light source part (2) or the receiving part (3) is fixed on the sliding rail in a sliding mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011544541.2A CN112730287A (en) | 2020-12-24 | 2020-12-24 | Method and device for measuring window error correction in full-spectrum water quality detection |
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| CN202011544541.2A CN112730287A (en) | 2020-12-24 | 2020-12-24 | Method and device for measuring window error correction in full-spectrum water quality detection |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11118715A (en) * | 1997-10-20 | 1999-04-30 | Suido Kiko Kaisha Ltd | Water quality meter and water quality measuring method |
| CN101403692A (en) * | 2008-10-27 | 2009-04-08 | 北京北分麦哈克分析仪器有限公司 | Laser gas analyzer and its calibration method |
| CN104198416A (en) * | 2014-09-15 | 2014-12-10 | 南京国电环保科技有限公司 | Real-time compensation method of measurement errors caused by spectrograph wavelength drift |
| CN206248652U (en) * | 2016-12-05 | 2017-06-13 | 浙江西地环境科技有限公司 | Real-time in-situ water quality monitor |
| CN109975222A (en) * | 2019-04-17 | 2019-07-05 | 四川万江一泓环境科技有限责任公司 | Full spectral water quality detection is calibrated automatically and window cleaning reminder system |
| CN106198424B (en) * | 2016-09-28 | 2020-03-06 | 深圳市七善科技有限公司 | Full-spectrum-based water quality online monitoring device and monitoring method thereof |
| CN111257259A (en) * | 2020-05-06 | 2020-06-09 | 芯视界（北京）科技有限公司 | Water quality detection method and equipment |
| CN111351755A (en) * | 2020-04-28 | 2020-06-30 | 北京微芯边缘计算研究院 | Full spectrum water quality sensor |
-
2020
- 2020-12-24 CN CN202011544541.2A patent/CN112730287A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11118715A (en) * | 1997-10-20 | 1999-04-30 | Suido Kiko Kaisha Ltd | Water quality meter and water quality measuring method |
| CN101403692A (en) * | 2008-10-27 | 2009-04-08 | 北京北分麦哈克分析仪器有限公司 | Laser gas analyzer and its calibration method |
| CN104198416A (en) * | 2014-09-15 | 2014-12-10 | 南京国电环保科技有限公司 | Real-time compensation method of measurement errors caused by spectrograph wavelength drift |
| CN106198424B (en) * | 2016-09-28 | 2020-03-06 | 深圳市七善科技有限公司 | Full-spectrum-based water quality online monitoring device and monitoring method thereof |
| CN206248652U (en) * | 2016-12-05 | 2017-06-13 | 浙江西地环境科技有限公司 | Real-time in-situ water quality monitor |
| CN109975222A (en) * | 2019-04-17 | 2019-07-05 | 四川万江一泓环境科技有限责任公司 | Full spectral water quality detection is calibrated automatically and window cleaning reminder system |
| CN111351755A (en) * | 2020-04-28 | 2020-06-30 | 北京微芯边缘计算研究院 | Full spectrum water quality sensor |
| CN111257259A (en) * | 2020-05-06 | 2020-06-09 | 芯视界（北京）科技有限公司 | Water quality detection method and equipment |
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