CN116465846A - Optical COD sensor temperature compensation calibration device and calibration method - Google Patents
Optical COD sensor temperature compensation calibration device and calibration method Download PDFInfo
- Publication number
- CN116465846A CN116465846A CN202310320230.5A CN202310320230A CN116465846A CN 116465846 A CN116465846 A CN 116465846A CN 202310320230 A CN202310320230 A CN 202310320230A CN 116465846 A CN116465846 A CN 116465846A
- Authority
- CN
- China
- Prior art keywords
- optical
- temperature
- calibration
- temperature compensation
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000002835 absorbance Methods 0.000 claims abstract description 45
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 238000012360 testing method Methods 0.000 claims abstract description 30
- 239000005304 optical glass Substances 0.000 claims abstract description 24
- 230000017105 transposition Effects 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 238000012937 correction Methods 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- IWZKICVEHNUQTL-UHFFFAOYSA-M potassium hydrogen phthalate Chemical compound [K+].OC(=O)C1=CC=CC=C1C([O-])=O IWZKICVEHNUQTL-UHFFFAOYSA-M 0.000 claims description 3
- 239000012086 standard solution Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 239000012482 calibration solution Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000031700 light absorption Effects 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
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011067 equilibration Methods 0.000 description 1
- 238000000691 measurement method Methods 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
- 238000012546 transfer Methods 0.000 description 1
- 238000000825 ultraviolet detection Methods 0.000 description 1
Classifications
-
- 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
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a temperature compensation calibration device and a calibration method for an optical COD sensor. The calibration device comprises a high-low temperature environment test box, a sensor positioning mechanism, a plurality of optical slides, a transposition mechanism and a controller; the high-low temperature environment test box is used for providing a set calibration temperature environment; each optical glass slide is equivalent to the absorbance of different standard liquid concentrations respectively; the transposition mechanism drives a plurality of optical slides to enter the detection light path of the optical COD sensor to be calibrated one by one. The invention uses the equivalent concentration optical glass slide to replace the water solution, reduces the error, and has high accuracy and good repeatability; when different calibration temperature environments are switched, data acquisition can be carried out only after the temperature of the sensor is balanced, the waiting time is short, and the calibration efficiency is remarkably improved.
Description
Technical Field
The invention relates to the technical field of sensor calibration, in particular to an optical COD sensor temperature compensation calibration device and a calibration method.
Background
The traditional method for measuring the COD value in the water body is mainly a potassium dichromate method measurement method, and the method has long analysis period and serious secondary pollution, and can not meet the requirements of modern water quality monitoring on real-time performance, no secondary pollution and the like. With the development of technology and the recent years, the UV254COD sensor based on the ultraviolet optical absorption method is increasingly applied, and the optical sensor does not need to pretreat a water sample, is rapid and convenient to detect and can be monitored on line in real time.
The core device of the UV254COD sensor is an optical LED and a photoelectric detector, ultraviolet detection light with specific wavelength is generated by the optical LED in a water sample to be detected, organic substances in the water sample can generate light absorption effect under the irradiation of ultraviolet light with the specific wavelength, so that organic substances with different concentrations can generate different light absorption effects; based on the principle, when the COD sensor is produced and calibrated in a factory, COD standard solutions with different concentrations are adopted, absorbance is measured, a linear fitting mathematical relationship is established, and a calibration fitting coefficient is written into an MCU in the COD sensor, so that in application, the COD measured value is directly detected and calculated.
In practice, however, there are significant interference factors in the calibration process, especially the ambient temperature and the concentration of the calibration point marking liquid, and regarding the ambient temperature, due to the physical characteristics of the LED, the light emission intensity of the LED will change with the temperature change at the same intensity of driving current; the linear fitting relation coefficients obtained by adopting calibration standard solutions with different concentrations at the same fixed temperature have different degrees of difference; therefore, the manufacturer needs to perform sensor temperature compensation in actual calibration work. In general, temperature compensation of a sensor is performed in a high-low temperature environment test box, the sensor and calibration solutions with different concentrations are placed in the box, a fixed temperature is controlled and maintained through the test box, and after the temperature of the sensor and the calibration solution is balanced, temperature fitting raw data acquisition is performed; the method has the following defects: 1. the equilibration time required for the solution is long, resulting in a significant portion of the time waiting for the calibration process; 2. at the same temperature, the solution needs to be replaced by opening the box for multiple times, and the balance is waited again, so that the operation is complicated; 3. under the action of high-low temperature circulation, the accuracy and stability of the solution can also change, and the uncertainty factor is increased.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a temperature compensation calibration device and a calibration method for an optical COD sensor.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: an optical COD sensor temperature compensation calibration device comprising:
a high-low temperature environment test chamber for providing a set calibration temperature environment;
the sensor positioning mechanism is used for fixing the position of the optical COD sensor to be calibrated;
the absorbance of each optical slide is equivalent to the absorbance of different standard liquid concentrations respectively;
the transposition mechanism is used for driving a plurality of optical slides to enter the detection light path of the optical COD sensor to be calibrated one by one;
the sensor positioning mechanism, the transposition mechanism and the optical glass slides are arranged in the high-low temperature environment test box;
and the controller is in signal connection with the optical COD sensor to be calibrated and the transposition mechanism.
According to the technical scheme, the optical glass with equivalent concentration is used for replacing the aqueous solution, so that errors are reduced, the accuracy is high, and the repeatability is good; when different calibration temperature environments are switched, data acquisition can be carried out only after the temperature of the sensor is balanced, the waiting time is short, and the calibration efficiency is remarkably improved.
Further, the optical glass slide is made of ultraviolet glass.
By adopting the preferable scheme, the ultraviolet glass is black in color, has lower light transmission to 400-700 nm, and shows different spectrum transmission curves in the ultraviolet region according to different types. The optical glass slides with different equivalent standard liquid concentrations can be made of ultraviolet glass with the same model, and different thicknesses can be customized.
Further, a dehumidifying and drying device and a humidity detection device are arranged in the high-low temperature environment test box.
Further, the humidity of the high-low temperature environment test chamber is below 30%.
By adopting the preferable scheme, the moisture in the high-low temperature environment test box is removed through the dehumidifying and drying device, so that the high-low temperature environment test box is maintained in a stable lower humidity environment, and the accuracy of calibration is improved.
Further, the sensor positioning mechanism comprises a base and 2 hoops which are coaxially arranged and are arranged on the base, and locking screws are arranged on the hoops.
By adopting the preferable scheme, the optical COD sensor to be calibrated can be conveniently and rapidly installed and stably fixed.
Further, the transposition mechanism comprises a supporting frame, a driving motor and rotating blades, wherein the driving motor is installed on the supporting frame, the rotating blades are installed on an output shaft of the driving motor, and each optical glass slide is installed on the circumference of each rotating blade at intervals.
Further, the driving motor is a stepping motor.
By adopting the preferable scheme, each optical slide can be accurately and sequentially transferred to the detection light path through the stepping motor, and the optical slide detector has a simple structure and high transposition speed.
The optical COD sensor temperature compensation calibration method comprises the following steps:
step 1, installing an optical COD sensor to be calibrated on a sensor positioning mechanism;
step 2, starting a high-low temperature environment test box, setting a first calibration temperature point for temperature compensation, and collecting the internal temperature of the high-low temperature environment test box and the internal temperature of an optical COD sensor by a controller;
step 3, after the two temperatures acquired by the controller are both stabilized at the set calibration temperature point, driving the transposition mechanism to enable the first optical glass slide to enter between the emission light window and the receiving light window of the optical COD sensor, and simultaneously acquiring an original absorption voltage value by the optical COD sensor and calculating absorbance under equivalent concentration; after the collection is finished, enabling a second optical slide to enter between an emission light window and a receiving light window of the optical COD sensor, and simultaneously enabling the optical COD sensor to work to collect an original absorption voltage value and calculate absorbance under equivalent concentration; according to the sequence in the step 3, completing the absorbance data acquisition of all equivalent concentrations at the first calibration temperature point;
step 4, setting a second calibration temperature point for the operation temperature compensation of the high-low temperature environment test box, and repeating the step 3 to finish the absorbance data acquisition of all equivalent concentrations on the second calibration temperature point;
step 5, referring to step 4, completing absorbance data acquisition of all equivalent concentrations at N calibration temperature points;
and 6, fitting data by means of the acquired data to obtain a formula for carrying out temperature compensation correction on the optical COD sensor.
According to the technical scheme, the optical glass with equivalent concentration is used for replacing the aqueous solution, so that errors are reduced, the accuracy is high, and the repeatability is good; when different calibration temperature environments are switched, data acquisition can be carried out only after the temperature of the sensor is balanced, the waiting time is short, and the calibration efficiency is remarkably improved.
Further, the specific steps of data fitting in the step 6 are as follows:
performing linear fitting on the equivalent concentration data and the absorbance data of the same calibration temperature point to obtain N formulas Y=K on N calibration temperature points t X+Q t Wherein Y represents an equivalent concentration, X represents absorbance, K t And Q t Are all temperature compensation intermediate coefficients, and the corresponding temperature compensation intermediate coefficient K at each calibration temperature point is obtained t And Q t Is a numerical value of (2);
then the standard temperature data and the temperature compensation intermediate coefficient K t Performing linear fitting to obtain a temperature compensation intermediate coefficient K t Linear relation K with temperature T t =a×t+b; intermediate coefficient Q of standard temperature data and temperature compensation t Performing linear fitting to obtain a temperature compensation intermediate coefficient Q t Linear relation Q with temperature T t =c×t+d, where a, B, C, D are temperature compensation coefficients;
calculating the COD value after temperature compensation correction according to the formula Z= (A X T+B) X+ (C X T+D), wherein Z represents the COD value after temperature compensation correction, T represents the temperature, and X represents the absorbance.
By adopting the preferable scheme, two-dimensional data fitting is carried out, a temperature compensation fitting formula is obtained, and the accuracy of the COD value after temperature compensation correction is improved.
Further, in the optical COD sensor temperature compensation calibration device, the equivalent method of the optical slide and the concentration of the target liquid includes:
at a calibration temperature, an optical glass slide is arranged between an emission light window and a receiving light window of an optical COD sensor, the optical COD sensor acquires an original absorption voltage value and calculates to obtain absorbance X 1 The method comprises the steps of carrying out a first treatment on the surface of the Placing a beaker in a constant-temperature water bath kettle with the same calibration temperature, adding a fixed amount of deionized water, transferring the same optical COD sensor into the beaker of the water bath kettle, weighing and adding standard substance potassium hydrogen phthalate into the beaker in an amount, collecting an original absorption voltage value by the optical COD sensor, and calculating to obtain absorbance X 2 When X is 1 ＝X 2 And stopping adding, and calculating to obtain the equivalent COD standard liquid concentration of the optical glass.
By adopting the preferable scheme, the accuracy of the equivalent COD standard liquid concentration data of the optical glass slide is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, 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 structural view of the present invention.
FIG. 2 is a graph showing absorbance at 0deg.C versus equivalent concentration for one embodiment of the invention.
FIG. 3 is a graph showing absorbance versus equivalent concentration at 10℃in one embodiment of the invention.
FIG. 4 is a graph showing absorbance versus equivalent concentration at 20℃in one embodiment of the invention.
FIG. 5 is a graph showing absorbance versus equivalent concentration at 30℃in one embodiment of the invention.
FIG. 6 is a graph showing absorbance versus equivalent concentration at 40℃in one embodiment of the invention.
Names of the corresponding parts indicated by numerals and letters in the drawings:
10-a sensor positioning mechanism; 11-hoops; 12-locking screws; 13-a base; 20-optical slide; 30-a transposition mechanism; 31-a supporting frame; 32-a drive motor; 33-rotating blades; 40-optical COD sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, in one embodiment of the present invention, an optical COD sensor temperature compensation calibration device includes:
a high-low temperature environment test chamber for providing a set calibration temperature environment;
a sensor positioning mechanism 10 for fixing the position of the optical COD sensor 40 to be calibrated;
a plurality of optical slides 20, the absorbance of each optical slide 20 being equivalent to the absorbance of different concentrations of the label liquid;
the transposition mechanism 30 is used for driving a plurality of optical slides to enter the detection light path of the optical COD sensor to be calibrated one by one;
the sensor positioning mechanism 10, the transposition mechanism 30 and the plurality of optical slides 20 are arranged in the high-low temperature environment test box;
and a controller in signal connection with the optical COD sensor 40 to be calibrated and the index mechanism 30.
The beneficial effects of adopting above-mentioned technical scheme are: the optical glass with equivalent concentration is used for replacing the aqueous solution, so that the error is reduced, the accuracy is high, and the repeatability is good; when different calibration temperature environments are switched, data acquisition can be carried out only after the temperature of the sensor is balanced, the waiting time is short, and the calibration efficiency is remarkably improved.
In other embodiments of the present invention, the optical slide 20 is made of ultraviolet glass. The ultraviolet glass is black in color, has lower transmission to 400-700 nm light, and shows different spectrum transmission curves in the ultraviolet region according to different types. Each optical glass 20 can adopt an optical filter to adjust the spectrum curve of the ultraviolet region so as to achieve the purpose of equivalent absorbance of different standard liquid concentrations. The optical glass slide 20 with different equivalent standard liquid concentrations can also adopt ultraviolet glass of the same model to customize different thicknesses.
In other embodiments of the present invention, a dehumidifying and drying device and a humidity detecting device are arranged in the high-low temperature environment test chamber. The humidity of the high-low temperature environment test chamber is below 30%. The beneficial effects of adopting above-mentioned technical scheme are: moisture in the high-low temperature environment test box is removed through the dehumidifying and drying device, so that the high-low temperature environment test box is maintained in a stable lower humidity environment, and the calibration accuracy is improved.
In other embodiments of the present invention, the sensor positioning mechanism 10 includes a base 13 and 2 coaxially disposed anchor ears 11 mounted on the base 13, and the anchor ears 11 are provided with locking screws 12. The beneficial effects of adopting above-mentioned technical scheme are: the optical COD sensor to be calibrated can be conveniently and rapidly installed and stably fixed.
In other embodiments of the present invention, the index mechanism 30 includes a support frame 31, a driving motor 32, and a rotating blade 33, the driving motor 32 is mounted on the support frame 31, the rotating blade 33 is mounted on an output shaft of the driving motor 32, and each optical slide 20 is mounted at intervals in a circumferential direction of the rotating blade 33.
In other embodiments of the present invention, the drive motor 32 is a stepper motor. The beneficial effects of adopting above-mentioned technical scheme are: the stepping motor can accurately and sequentially transfer each optical slide to the detection light path, and the structure is simple and the transposition speed is high.
The optical COD sensor temperature compensation calibration method comprises the following steps:
step 1, an optical COD sensor to be calibrated is installed on a sensor positioning mechanism, is placed into a high-low temperature environment test box, and is connected with a communication cable and a power supply cable;
step 2, starting a high-low temperature environment test box, and setting a temperature compensation calibration point, for example: 0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃ and starting to run one by one. When the built-in temperature of the high-low temperature test box and the acquisition temperature of the NTC temperature sensor in the sensor are stable (if the temperature reaches the calibration temperature +/-0.3 ℃), the temperature point can be judged to be balanced, and the data acquisition work can be started;
step 3, after the first calibration temperature point (such as 0 ℃) is balanced, the controller starts to drive the stepping motor to rotate by a fixed angle, so that the first optical glass slide enters between the emission light window and the receiving light window of the optical COD sensor, and meanwhile the optical COD sensor works to collect an original absorption voltage value and calculate absorbance under equivalent concentration; after the collection is finished, the stepping motor is driven to rotate for a fixed angle again, so that a second optical slide enters between an emission light window and a receiving light window of the optical COD sensor, and meanwhile, the optical COD sensor works to collect an original absorption voltage value and calculate absorbance under equivalent concentration; by such pushing, the absorbance data acquisition of all equivalent concentrations at the first calibration temperature point is completed;
step 4, setting a second calibration temperature point (such as 10 ℃) of the high-low temperature environment test box, and repeating the step 3 to finish the absorbance data acquisition of all equivalent concentrations on the second calibration temperature point;
step 5, referring to step 4, completing absorbance data acquisition of all equivalent concentrations at 5 calibration temperature points;
and 6, fitting data by means of the acquired data to obtain a formula for carrying out temperature compensation correction on the optical COD sensor.
In other embodiments of the present invention, the specific steps of data fitting in the step 6 are:
equivalent concentration data and absorbance data of the same calibration temperature point are calculated as y=k t X+Q t Performing linear fitting to obtain 5 formulas on 5 calibration temperature points: y=k t1 X+Q t1 ，Y＝K t2 X+Q t2 ，Y＝K t3 X+Q t3 ，Y＝K t4 X+Q t4 ，Y＝K t5 X+Q t5 Wherein Y represents an equivalent concentration and X represents absorbance;
as shown in FIGS. 2-6, in one embodiment, a curve is fitted between absorbance at 0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃ and equivalent concentration to obtain K t、 Q t The data are as follows:
| temperature T (. Degree. C.) | K t | Q t |
| 0 | K t1 ＝297.87 | Q t1 ＝-1.4716 |
| 10 | K t2 ＝291.89 | Q t2 ＝-0.4581 |
| 20 | K t3 ＝292.49 | Q t3 ＝-0.9385 |
| 30 | K t4 ＝289.71 | Q t4 ＝-1.6528 |
| 40 | K t5 ＝287.49 | Q t5 ＝-2.1135 |
Next, the temperature compensation intermediate coefficient K is performed according to the data in the above table t Linearly fitting with temperature T to obtain temperature compensation intermediate coefficient K t Linear relation K with temperature T t =a×t+b; at the same time temperature compensating intermediate coefficient Q t Linearly fitting with temperature T to obtain temperature compensation intermediate coefficient Q t Linear relation Q with temperature T t =c×t+d, where a, B, C, D are temperature compensation coefficients;
substituting the obtained temperature compensation coefficient A, B, C, D to obtain a formula Z= (A X T+B) X+ (C X T+D) and calculating a COD value after temperature compensation correction, wherein Z represents the COD value after temperature compensation correction, T represents temperature, and X represents absorbance.
The beneficial effects of adopting above-mentioned technical scheme are: and performing two-dimensional data fitting to obtain a temperature compensation fitting formula, and improving the accuracy of the COD value after temperature compensation correction.
In other embodiments of the present invention, in an optical COD sensor temperature compensation calibration device, an equivalent method of optical slide and liquid concentration comprises:
at a calibration temperature, an optical glass slide is arranged between an emission light window and a receiving light window of an optical COD sensor, the optical COD sensor acquires an original absorption voltage value and calculates to obtain absorbance X 1 The method comprises the steps of carrying out a first treatment on the surface of the Placing a beaker in a constant-temperature water bath kettle with the same calibration temperature, adding a fixed amount of deionized water, transferring the same optical COD sensor into the beaker of the water bath kettle, weighing and adding standard substance potassium hydrogen phthalate into the beaker in an amount, collecting an original absorption voltage value by the optical COD sensor, and calculating to obtain absorbance X 2 When X is 1 ＝X 2 And stopping adding, and calculating to obtain the equivalent COD standard liquid concentration of the optical glass. The beneficial effects of adopting above-mentioned technical scheme are: and the accuracy of the equivalent COD standard liquid concentration data of the optical glass slide is improved.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. An optical COD sensor temperature compensation calibration device, comprising:
a high-low temperature environment test chamber for providing a set calibration temperature environment;
the sensor positioning mechanism is used for fixing the position of the optical COD sensor to be calibrated;
the absorbance of each optical slide is equivalent to the absorbance of different standard liquid concentrations respectively;
the transposition mechanism is used for driving a plurality of optical slides to enter the detection light path of the optical COD sensor to be calibrated one by one;
the sensor positioning mechanism, the transposition mechanism and the optical glass slides are arranged in the high-low temperature environment test box;
and the controller is in signal connection with the optical COD sensor to be calibrated and the transposition mechanism.
2. The device for calibrating temperature compensation of an optical COD sensor according to claim 1, wherein the optical glass is ultraviolet glass.
3. The optical COD sensor temperature compensation calibration device according to claim 1, wherein a dehumidifying and drying device and a humidity detecting device are arranged in the high-low temperature environment test chamber.
4. The optical COD sensor temperature compensation calibration device of claim 3 wherein the humidity of the high and low temperature environmental test chamber is below 30%.
5. The optical COD sensor temperature compensation calibration device of claim 1, wherein the sensor positioning mechanism comprises a base and 2 coaxially disposed hoops mounted on the base, the hoops being provided with locking screws.
6. The device according to claim 1, wherein the transposition mechanism comprises a support frame, a driving motor and rotating blades, the driving motor is mounted on the support frame, the rotating blades are mounted on an output shaft of the driving motor, and each optical glass slide is mounted on the circumference of each rotating blade at intervals.
7. The optical COD sensor temperature compensation calibration device of claim 6, wherein the drive motor is a stepper motor.
8. The optical COD sensor temperature compensation calibration method, characterized by comprising the following steps based on the optical COD sensor temperature compensation calibration device according to claim 1:
step 1, installing an optical COD sensor to be calibrated on a sensor positioning mechanism;
step 2, starting a high-low temperature environment test box, setting a first calibration temperature point for temperature compensation, and collecting the internal temperature of the high-low temperature environment test box and the internal temperature of an optical COD sensor by a controller;
step 3, after the two temperatures acquired by the controller are both stabilized at the set calibration temperature point, driving the transposition mechanism to enable the first optical glass slide to enter between the emission light window and the receiving light window of the optical COD sensor, and simultaneously acquiring an original absorption voltage value by the optical COD sensor and calculating absorbance under equivalent concentration; after the collection is finished, enabling a second optical slide to enter between an emission light window and a receiving light window of the optical COD sensor, and simultaneously enabling the optical COD sensor to work to collect an original absorption voltage value and calculate absorbance under equivalent concentration; according to the sequence in the step 3, completing the absorbance data acquisition of all equivalent concentrations at the first calibration temperature point;
step 4, setting a second calibration temperature point for the operation temperature compensation of the high-low temperature environment test box, and repeating the step 3 to finish the absorbance data acquisition of all equivalent concentrations on the second calibration temperature point;
step 5, referring to step 4, completing absorbance data acquisition of all equivalent concentrations at N calibration temperature points;
and 6, fitting data by means of the acquired data to obtain a formula for carrying out temperature compensation correction on the optical COD sensor.
9. The method for calibrating the temperature compensation of the optical COD sensor according to claim 8 wherein the specific steps of fitting the data in the step 6 are:
performing linear fitting on the equivalent concentration data and the absorbance data of the same calibration temperature point to obtain N formulas Y=K on N calibration temperature points t X+Q t Wherein Y represents an equivalent concentration, X represents absorbance, K t And Q t Are all temperature compensation intermediate coefficients, and the corresponding temperature compensation intermediate coefficient K at each calibration temperature point is obtained t And Q t Is a numerical value of (2);
then the standard temperature data and the temperature compensation intermediate coefficient K t Performing linear fitting to obtain a temperature compensation intermediate coefficient K t Linear relation K with temperature T t =a×t+b; intermediate coefficient Q of standard temperature data and temperature compensation t Performing linear fitting to obtain a temperature compensation intermediate coefficient Q t Linear relation Q with temperature T t =c×t+d, where a, B, C, D are temperature compensation coefficients;
calculating the COD value after temperature compensation correction according to the formula Z= (A X T+B) X+ (C X T+D), wherein Z represents the COD value after temperature compensation correction, T represents the temperature, and X represents the absorbance.
10. The method for calibrating the temperature compensation of the optical COD sensor according to claim 8, wherein in the device for calibrating the temperature compensation of the optical COD sensor, the equivalent method for the concentration of the optical slide and the standard solution comprises the following steps:
at a calibrated temperature, an optical slide is placed on an optical COD sensor to emit lightAn optical COD sensor acquires an original absorption voltage value between the window and the receiving light window and calculates to obtain absorbance X 1 The method comprises the steps of carrying out a first treatment on the surface of the Placing a beaker in a constant-temperature water bath kettle with the same calibration temperature, adding a fixed amount of deionized water, transferring the same optical COD sensor into the beaker of the water bath kettle, weighing and adding standard substance potassium hydrogen phthalate into the beaker in an amount, collecting an original absorption voltage value by the optical COD sensor, and calculating to obtain absorbance X 2 When X is 1 ＝X 2 And stopping adding, and calculating to obtain the equivalent COD standard liquid concentration of the optical glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310320230.5A CN116465846A (en) | 2023-03-29 | 2023-03-29 | Optical COD sensor temperature compensation calibration device and calibration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310320230.5A CN116465846A (en) | 2023-03-29 | 2023-03-29 | Optical COD sensor temperature compensation calibration device and calibration method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116465846A true CN116465846A (en) | 2023-07-21 |
Family
ID=87181662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310320230.5A Pending CN116465846A (en) | 2023-03-29 | 2023-03-29 | Optical COD sensor temperature compensation calibration device and calibration method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116465846A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117054048A (en) * | 2023-10-12 | 2023-11-14 | 山东风途物联网科技有限公司 | Method for calibrating rotary positioning lens system of optical device for water quality detection |
-
2023
- 2023-03-29 CN CN202310320230.5A patent/CN116465846A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117054048A (en) * | 2023-10-12 | 2023-11-14 | 山东风途物联网科技有限公司 | Method for calibrating rotary positioning lens system of optical device for water quality detection |
| CN117054048B (en) * | 2023-10-12 | 2024-01-26 | 山东风途物联网科技有限公司 | Method for calibrating rotary positioning lens system of optical device for water quality detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116465846A (en) | Optical COD sensor temperature compensation calibration device and calibration method | |
| CN107462504B (en) | Online self-correcting air particulate matter detection device and self-correcting and state self-diagnosing method thereof | |
| CN219590197U (en) | Optical COD sensor temperature compensation calibrating device | |
| CN117074345B (en) | Detection and calibration method for optical equipment for water quality detection | |
| CN205229055U (en) | Urine mummification analytical equipment based on many monochromatic light and optic fibre | |
| CN203705336U (en) | Double-spectrum water quality analyzer | |
| CN110568144B (en) | Temperature compensation method for ammonia nitrogen detection | |
| CN110376190B (en) | Spectrum-based cell culture suspension pH value detection method | |
| CN202033293U (en) | Chloramphenicol concentration quantitative detection device based on test strip | |
| CN110567899B (en) | Low-temperature compensation method for COD detection | |
| CN107478632B (en) | Method for detecting pH value through fluorescence of pH test paper | |
| CN2921827Y (en) | Portable photometer for measuring low concentration ozone | |
| CN110849826B (en) | Reaction membrane manufacturing method and ammonia nitrogen detection device and method based on reaction membrane | |
| CN202189004U (en) | Solarization climate tester capable of automatically calibrating | |
| CN112595440B (en) | Spectrum calibration method for optical fiber thermometer | |
| CN117054048B (en) | Method for calibrating rotary positioning lens system of optical device for water quality detection | |
| CN111693464B (en) | Preparation method and preparation device of optical fiber sensor and sensor | |
| CN112147101A (en) | Portable water quality analyzer and method for soluble organic matters and nitrate nitrogen | |
| CN101806582A (en) | Automatic gauge block calibrating device based on stepper motor | |
| CN2597983Y (en) | On line COD water quality measurer | |
| CN219956560U (en) | Device for automatically tracking and adjusting light shielding ring of environment monitor | |
| CN102507522B (en) | Data acquisition method and heating system for oxygen radical absorbance capacity measuring analyzer | |
| JP3648105B2 (en) | Nitrogen dioxide gas detection method and nitrogen dioxide gas detection device | |
| CN216717530U (en) | Liquid level measuring device | |
| CN214150434U (en) | Portable fruit quality detection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |