CN118090515B - Calibration method of full-detection type surface densimeter - Google Patents
Calibration method of full-detection type surface densimeter Download PDFInfo
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- CN118090515B CN118090515B CN202410524017.0A CN202410524017A CN118090515B CN 118090515 B CN118090515 B CN 118090515B CN 202410524017 A CN202410524017 A CN 202410524017A CN 118090515 B CN118090515 B CN 118090515B
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- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005259 measurement Methods 0.000 claims description 44
- 239000000523 sample Substances 0.000 claims description 15
- 230000005855 radiation Effects 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
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Abstract
The invention discloses a calibration method of a full-detection type surface densimeter, which relates to the technical field of sheet detection, in particular to a calibration method of a full-detection type surface densimeter.
Description
Technical Field
The invention relates to the field of sheet detection, in particular to a calibration method of a full-detection type surface densimeter.
Background
The spot check type surface density meter adopts a pair of probes of a small-area light spot ray source and a single detector with larger size, and scans back and forth in the width direction to realize the detection of the surface density profile of the lithium battery pole piece.
The full detection type surface density meter adopts a pair of probes of a strip-shaped light spot ray source and a linear array detector (the size of a single pixel detector is smaller), the strip-shaped light spot covers the width of the whole pole piece, the pole piece surface density profile detection can be realized without scanning the probe back and forth in the width direction, meanwhile, the pole piece is in tape feeding, and the pole piece is in full-covered line scanning full detection type surface density detection.
Before the surface density detection is carried out, the full detection type surface density meter is required to be calibrated according to a target detection object, namely a gradient pole piece sample with a proper surface density range is prepared, correlation fitting of a non-least square method is carried out on a pole piece surface density value and a measured value of a linear array detector, a parameter value in a linear or non-linear calibration model is obtained, and the quality of the calibration fitting is judged according to the correlation R 2.
In the spot check type surface density meter, only a single detector needs to be calibrated.
In the full detection type surface density meter, the detector is a linear array detector, and each pixel detector works independently, so that each pixel detector in the linear array detector is required to be calibrated, and the calibration fitting correlation R 2 of each pixel detector is required to be 0.995 or more.
At present, when such calibration is performed, a strip-shaped pole piece sample is taken in the tape feeding direction, the strip-shaped pole piece sample is placed between probes, each pixel obtains a measured value, after the measurement of the calibration piece is completed, the strip-shaped calibration piece is required to be sampled in a partitioning mode and weighed, the area density value of each partition is obtained, the area density value corresponds to each pixel detector, the process is repeated for a plurality of area density gradient calibration pieces, and finally the calibration process is completed. In such a calibration mode, there are the following disadvantages:
1. the length of the long calibration piece is required to be larger than or equal to that of the linear array detector, when detecting the pole piece with larger width of 1-2 m, the length of the linear array detector is very large, the corresponding calibration piece is very long, and the flat tightening and fixing of the calibration piece are difficult;
2. The calibration process is completed by taking a plurality of calibration sheets with surface density gradients, and more particularly, the requirement is that each pixel detector can detect gradient samples in a proper range, because continuous long calibration sheets are needed, the condition that the surface density difference of the pole pieces detected by some pixel detectors is very small and effective calibration cannot be completed easily occurs;
3. The method for obtaining the surface density of each position of the long calibration sheet is to sample in a partition mode, even if a smaller 10mm diameter sampler is used, the surface density value is obtained as the average value of the area, the average value is used as the surface density value corresponding to the measured values of a plurality of pixel detectors, and under the condition of poor sheet uniformity, the situation that the local surface density deviates from the average value greatly exists, and the calibration fitting correlation is further poor;
4. In general, it is difficult to prepare a suitable, single long calibration piece with good uniformity of the surface density, and a plurality of long calibration pieces with good gradient ranges of the surface density at the same position, and even if there is a suitable long calibration piece, this calibration method is time-consuming, so that the achievement rate of the calibration fitting correlation of all pixel detectors can reach 0.995 or above is low.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a calibration method of a full-detection type surface densimeter.
In order to achieve the technical purpose, the scheme of the invention is as follows: the calibration method of the full-detection type surface densimeter comprises preparation work before measurement, a measurement process and completion work after measurement, wherein the preparation work before measurement comprises the start of calibration and the preparation of a calibration piece, the measurement process comprises the steps of obtaining a zero point by measuring air, obtaining a measured value by measuring the calibration piece and inputting the surface density, and the completion work after measurement comprises the calibration fitting of a pixel detector and the completion of calibration.
Preferably, the pre-measurement preparation includes starting calibration and preparing a calibration sheet:
(1-1), starting calibration: preheating a ray source and a linear array detector to enable the ray source and the linear array detector to be in a thermal stable state;
(1-2), preparing a standard piece: taking a plurality of calibration sheets as detection objects, weighing the calibration sheets and obtaining the surface densities of the calibration sheets, wherein the surface density range of the calibration sheets is required to cover the surface density detection range of the detection objects;
Preferably, the measurement process includes measuring air to obtain zero, measuring the calibration piece to obtain measured value and inputting area density:
(2-1), air measurement to obtain zero point: the ray source emits rays to the linear array detector, the linear array detector comprises a plurality of pixel detectors, each pixel detector records a signal value I 0 when the rays penetrate through the air, and a zero value ln (I 0) of each pixel detector is calculated by taking the natural logarithm;
(2-2), measuring the standard piece to obtain a measured value: driving the standard piece to horizontally pass through the space between the ray source and the linear array detector at a constant speed, collecting a signal value I of the ray passing through the standard piece by each pixel detector of the linear array detector, and calculating the measured value of the standard piece in a calculation mode ln (I 0) -ln (I);
(2-3) replacing a plurality of different calibration sheets, and repeating the step 2-2 to enable each pixel detector to obtain the measured values of the plurality of calibration sheets;
(2-4), surface density input: the surface density value of each of the calibration pieces is input to the processor in accordance with the order of the calibration piece movement measurement.
Preferably, the post-measurement completion comprises pixel detector calibration fitting and completion of calibration:
(3-1), pixel detector calibration fitting: and carrying out least square fitting on the surface density value y and the measured value x of each pixel detector, and judging whether the fitting correlation R 2 of all the pixel detectors meets or not more than 0.995.
(3-2), Finishing calibration: and saving parameters in the calibration model of all pixel detectors.
Preferably, the radiation source and the linear array detector are arranged in parallel, a calibration device is arranged between the radiation source and the linear array detector in parallel, the calibration device comprises a calibration sheet, a fixing device and a displacement device, and the displacement device drives the fixing device to drive the calibration sheet to horizontally move at a uniform speed between the radiation source and the linear array detector.
Preferably, the fixing device is used for fixing at least one of the standard pieces.
Preferably, the position of the calibration sheet is consistent with the position of the pole piece in actual measurement between the pixel probes.
Preferably, the length of the calibration sheet is smaller than the width of the linear array detector, and the length of the calibration sheet is 10 mm-100 mm.
The invention has the advantages that,
1. The calibration sheet is simple to fix, the flat and tight fixing effect is good, the calibration sheet can be ensured to be parallel to the ray source and the detector, rays penetrate through the calibration sheet in a vertical mode, and therefore the measured value corresponds to the surface density value well.
2. The calibration sheet is convenient to sample, and the surface density gradient calibration sheet with a proper range is also convenient and easy to operate, and the time is less, and each pixel detector measures the same group of calibration sheets, so that the effective calibration of each pixel detector can be ensured.
3. The surface density value of the standard piece is weighed and obtained, and the standard piece passes through each pixel detector at a uniform speed, so that the whole standard piece is measured by each pixel detector, the surface density value obtained by weighing can better correspond to the measured value, the situation that the local surface density value deviates greatly due to the non-uniformity of the standard piece and the measured value of a single pixel detector corresponds poorly to the surface density value is eliminated, and the calibration fitting correlation of all pixel sensors can be effectively realized to be 0.995 or above.
4. The method for preparing the calibration sheet, calibrating and measuring and obtaining the surface density is simple and easy, and has high reliability, so that the calibration time can be reduced, the calibration efficiency can be improved, the calibration success rate can be greatly improved, and a reliable precondition is provided for the surface density detection with high accuracy of the full-detection type surface density meter.
Drawings
FIG. 1 is a flow chart of a calibration method of a full detection type surface densitometer of the invention;
FIG. 2 is a schematic diagram of the basic structure of a full detection type surface densitometer method according to the present invention;
FIG. 3 is a schematic diagram of measured values collected by a pixel detector;
FIG. 4 is a graph of the proposed correlation R 2 results for a pixel detector calibration fit;
FIG. 5 is a schematic view of a fixing device;
FIG. 6 is a schematic view of the structure of the fixing device a;
FIG. 7 is a schematic view of the structure of the fixing device b;
FIG. 8 is a schematic view of a mounting structure of a calibration sheet and a fixture.
In the figure: 1. fixing device 2, the standard piece.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1-8, the specific embodiment of the invention is a calibration method of a full-detection type surface densitometer, which comprises preparation work before measurement, a measurement process and completion work after measurement, wherein the preparation work before measurement comprises starting calibration and preparing a calibration piece 2, the measurement process comprises measuring air to obtain a zero point, measuring the calibration piece 2 to obtain a measured value and inputting the surface density, and the completion work after measurement comprises pixel detector calibration fitting and completion calibration.
The pre-measurement preparation includes starting calibration and preparing the calibration sheet 2:
(1-1), starting calibration: preheating a ray source and a linear array detector to enable the ray source and the linear array detector to reach a thermal stable state;
(1-2), preparing a standard sheet 2: taking a plurality of standard pieces 2 as detection objects, weighing the standard pieces 2 and obtaining the surface densities of the standard pieces 2, wherein the surface density range of the standard pieces 2 is required to cover the surface density detection range of the detection objects;
The measuring process comprises the steps of measuring air to obtain zero points, measuring the standard sheet 2 to obtain measured values and inputting the area density:
(2-1), air measurement to obtain zero point: the ray source emits rays to the linear array detector, the ray source forms a strip-shaped light spot on the linear array detector, the strip-shaped light spot covers the breadth of the linear array detector, the linear array detector comprises a plurality of pixel detectors, each pixel detector records a signal value I 0 when the rays penetrate through the air, and a zero point value ln (I 0) of each pixel detector is calculated by taking the natural logarithm;
(2-2), measuring the standard piece 2 to obtain a measured value: the standard plate 2 is driven to horizontally pass through the space between the ray source and the linear array detector at a constant speed, each pixel detector of the linear array detector collects a signal value I of the rays passing through the standard plate 2, the measured value of the standard plate 2 is calculated by a calculation mode ln (I 0) -ln (I),
(2-3) Replacing a plurality of different calibration sheets 2, and repeating the step 2-2 to enable each pixel detector to obtain the measured values of the plurality of calibration sheets 2;
(2-4), surface density input: the surface density value of each of the calibration pieces 2 is input to the processor in correspondence with the order of movement measurement of the calibration pieces 2, respectively, and the same surface density value is used for each pixel detector because each pixel detector measures the same calibration piece 2.
The post-measurement completion work comprises pixel detector calibration fitting and calibration completion:
(3-1), pixel detector calibration fitting: and carrying out least square fitting on the surface density value y and the measured value x of each pixel detector, adopting linear fitting y=k x+b in smaller time, adopting quadratic polynomial y=a x 2+b x+c in larger time according to the size of the surface density range, and judging whether the fitting correlation R 2 of all the pixel detectors meets the correlation requirement or not, wherein the value is more than or equal to 0.995.
(3-2), Finishing calibration: and saving parameters in the calibration model of all pixel detectors.
Wherein, the ray source: the radiation source is an X/beta radiation source, and generates long-strip light spots to cover the whole width of the detection object;
A linear array detector: the detector comprises a plurality of gas or solid pixel detectors which are used for receiving rays emitted by a ray source and independently outputting signal values;
A processor: the method comprises the steps of receiving signal values output by a linear array detector, calculating the signal values into zero values and measured values, performing calibration fitting on the surface density, and storing a calibration model of each pixel detector;
The radiation source and the linear array detector are arranged in parallel, a calibration device is arranged between the radiation source and the linear array detector in parallel, the calibration device comprises a calibration sheet 2, a fixing device 1 and a displacement device, and the displacement device drives the fixing device 1 to drive the calibration sheet 2 to horizontally move at a uniform speed between the radiation source and the linear array detector.
The fixing device 1 is used for fixing at least one piece of the calibration sheet 2.
The position of the calibration sheet 2 coincides with the position of the pole piece at the time of actual measurement at the position between the pixel probes.
The length of the calibration piece 2 is smaller than the width of the linear array detector, and the length of the calibration piece 2 is 10 mm-100 mm.
The displacement device comprises a motor and a guide rail, and the motor drives the fixing device to displace on the guide rail.
The stator 2 may be rectangular or circular, wherein the rectangular stator has the advantage of being easy to fix and the circular stator 2 has the advantage that the measurement duty cycle is better.
As shown in fig. 5, the fixing device 1 is a C-shaped device, and can fix one or more calibration sheets 2, and when fixing the plurality of calibration sheets, measurement of a plurality of calibration sheets by each pixel detector can be realized through one displacement, so that the calibration efficiency is further improved.
As shown in fig. 6 and 7, the fixing device 1 is also provided with two types of fixing devices a and b, wherein the fixing device a and the fixing device b can fix one or more pieces of the standard pieces 2, and the fixing device a has the advantage of higher stability, and the fixing device b has the advantage of completely eliminating the influence of radiation irradiation on the left side and the right side of the fixing device 1 on the measurement of the standard pieces 2 by the pixel detector.
The following description is made with reference to specific examples.
Wherein, the size of a single pixel detector in the linear array detector is 0.4mm, and the total number of the pixel detectors is 1024.
Step S1, starting calibration: preheating a ray source and a linear array detector to enable the ray source and the linear array detector to be in a thermal stable state;
Step S2, preparing a standard piece 2: three calibration sheets 2 are prepared, the sizes of the calibration sheets 2 are 30mm, the marks are respectively one, two and three, each calibration sheet 2 is weighed, the surface density is obtained, m1 is 175.56g/m 2, m2 is 184.89g/m 2, m3 is 195.67g/m 2, m1, m2 and m3 are relatively poor, and the purpose is that the calibration effect is better;
Step S3, measuring air to obtain zero point: the ray source emits rays to the linear array detector, the linear array detector comprises a plurality of pixel detectors, each pixel detector records a signal value I 0 when the rays penetrate through the air, and then the natural logarithm is taken to calculate a zero value ln (I 0) of each pixel detector;
Step S4, measuring the standard piece 2 to obtain a measured value: the calibration sheet 2 is required to be stretched and pressed tightly and fixed on a displacement device, the calibration sheet 2 is parallel to a ray source and a linear array detector, the position of the calibration sheet 2 between probes is consistent with the position of a pole piece in actual measurement, namely, the distance between the probes is consistent with the distance between the probes, the displacement device carries the calibration sheet 2, the calibration sheet enters a first pixel detector at a constant speed of 50mm/s and finally leaves a last pixel detector, the measurement value (detector signal value I, measurement values ln (I 0) -ln (I)) collected by each pixel detector in the period of time is filtered and screened to obtain the measurement value of the calibration sheet 2, a plurality of different calibration sheets 2 are replaced, and the displacement measurement of the calibration sheet 2 is repeated for a plurality of times, so that each pixel detector obtains the measurement value of the calibration sheet 2;
As shown in fig. 3, the abscissa is the number of times the pixel sensor collects the measured value, the ordinate is the measured value of the calibration sheet 2, the measured value of air is close to 0, the measured value of the calibration sheet 2 is shorter, the measured value of the C-shaped aluminum piece fixing device 1 is higher, the measured value in the frame is filtered and screened out, the average is made, and the obtained average is used as the measured value of the pixel sensor to measure the calibration sheet 2.
As shown in fig. 8, the fixing device 1 is a C-shaped aluminum piece, the opening size of the C-shaped aluminum piece is 60mm x 20mm, the calibration piece 2 is fixed at the right side of the opening of the C-shaped aluminum piece, a certain distance is provided between the opening and the left side of the C-shaped aluminum piece, the opening width of the C-shaped aluminum piece is 20mm so as to prevent the radiation from irradiating the upper side and the lower side of the aluminum piece to influence the pixel detector to measure the calibration piece 2, and the distance provided at the left side is 30mm so as to prevent the radiation from irradiating the left side of the aluminum piece to influence the pixel detector to measure the calibration piece 2.
S5, inputting the surface density: inputting the surface density value of each calibration sheet 2 to the processor correspondingly according to the sequence of the movement measurement of the calibration sheets 2, wherein each pixel detector uses the same surface density value because each pixel detector measures the same calibration sheet 2;
S6, calibrating and fitting the pixel detector: performing least square fitting on the surface density value y and the measured value x corresponding to each pixel detector, adopting linear fitting y=k x+b in smaller time and adopting quadratic polynomial y=a x 2+b x+c in larger time according to the size of the surface density range, and judging that fitting correlation R 2 of all pixel detectors meets 0.995 or more;
as shown in FIG. 4, the values of the correlation R 2 of the linear fitting are all greater than 0.995, and the calibration is valid.
Step S7, calibration is completed: and saving parameters in the calibration model of all pixel detectors.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the invention, but any minor modifications, equivalents, and improvements made to the above embodiments according to the technical principles of the present invention should be included in the scope of the technical solutions of the present invention.
Claims (6)
1. A calibration method of a full-detection type surface densimeter is characterized by comprising the following steps of: the method comprises the steps of preparing work before measurement, measuring process and finishing work after measurement, wherein the preparing work before measurement comprises the steps of starting calibration and preparing calibration pieces, the measuring process comprises the steps of obtaining zero point by measuring air, obtaining measured value by measuring the calibration pieces and inputting the surface density, and the finishing work after measurement comprises the steps of calibrating fitting of a pixel detector and finishing calibration;
the measuring process comprises the steps of measuring air to obtain zero points, measuring a standard sheet to obtain measured values and inputting the area density:
(2-1), air measurement to obtain zero point: the ray source emits rays to the linear array detector, the linear array detector comprises a plurality of pixel detectors, each pixel detector records a signal value I 0 when the rays penetrate through the air, and a zero value ln (I 0) of each pixel detector is calculated by taking the natural logarithm;
(2-2), measuring the standard piece to obtain a measured value: driving a calibration sheet to horizontally enter a first pixel detector at a uniform speed and finally leave a last pixel detector, wherein the length of the calibration sheet is smaller than the width of a linear array detector, the length of the calibration sheet is 10 mm-100 mm, each pixel detector of the linear array detector collects a signal value I of rays passing through the calibration sheet, and a measurement value of the calibration sheet is calculated through calculation modes ln (I 0) -ln (I);
(2-3) replacing a plurality of different calibration sheets, and repeating the step 2-2 to enable each pixel detector to obtain the measured values of the plurality of calibration sheets;
(2-4), surface density input: the surface density value of each of the calibration pieces is input to the processor in accordance with the order of the calibration piece movement measurement.
2. The method of calibrating a full-detection type areal density meter of claim 1, wherein the pre-measurement preparation comprises starting calibration and preparing a calibration sheet:
(1-1), starting calibration: preheating a ray source and a linear array detector to enable the ray source and the linear array detector to be in a thermal stable state;
(1-2), preparing a standard piece: taking a plurality of calibration pieces as detection objects, weighing the calibration pieces and obtaining the surface densities of the calibration pieces, wherein the surface density range of the calibration pieces is required to cover the surface density detection range of the detection objects.
3. The method for calibrating a full detection type surface densitometer according to claim 1, wherein the post-measurement completion comprises pixel detector calibration fitting and calibration completion:
(3-1), pixel detector calibration fitting: carrying out least square fitting on the surface density value y and the measured value x of each pixel detector, and judging whether the fitting correlation R 2 of all the pixel detectors meets or not more than 0.995;
(3-2), finishing calibration: and saving parameters in the calibration model of all pixel detectors.
4. A method for calibrating a full detection type surface densitometer according to any one of claims 1 to 3, wherein the radiation source and the linear array detector are arranged in parallel, the calibration device is arranged between the radiation source and the linear array detector in parallel and comprises a calibration sheet, a fixing device and a displacement device, and the displacement device drives the fixing device to drive the calibration sheet to move horizontally and uniformly between the radiation source and the linear array detector.
5. The method of calibrating a full-detection type surface densitometer of claim 4, wherein the fixing means is used for fixing at least one of the calibration pieces.
6. The method according to claim 4, wherein the position of the calibration piece between the pixel probes is identical to the position of the pole piece at the time of actual measurement.
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| CN115683937A (en) * | 2023-01-04 | 2023-02-03 | 浙江双元科技股份有限公司 | Lithium battery pole piece surface density detection system and method based on linear array photoelectric sensor |
| CN117129371A (en) * | 2023-10-27 | 2023-11-28 | 宁德时代新能源科技股份有限公司 | Calibration method, device and readable storage medium for areal density measuring instrument |
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| GB201114151D0 (en) * | 2011-08-17 | 2011-10-05 | Johnson Matthey Plc | Density and level measurement apparatus |
| JP6018811B2 (en) * | 2012-06-19 | 2016-11-02 | 株式会社ニューフレアテクノロジー | Drift correction method and drawing data creation method |
| US9360406B2 (en) * | 2013-04-17 | 2016-06-07 | Thermo Fisher Scientific Inc. | Method and apparatus for self-calibration of density profiler |
| JP7126367B2 (en) * | 2018-03-29 | 2022-08-26 | 株式会社ニューフレアテクノロジー | Charged particle beam writing apparatus and charged particle beam writing method |
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| CN117214206B (en) * | 2023-09-12 | 2024-10-01 | 常州锐奇精密测量技术有限公司 | Surface density full detection method and system |
| CN118130310B (en) * | 2024-05-06 | 2024-07-02 | 常州锐奇精密测量技术有限公司 | Calibration method of full-detection type surface densimeter |
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| CN115683937A (en) * | 2023-01-04 | 2023-02-03 | 浙江双元科技股份有限公司 | Lithium battery pole piece surface density detection system and method based on linear array photoelectric sensor |
| CN117129371A (en) * | 2023-10-27 | 2023-11-28 | 宁德时代新能源科技股份有限公司 | Calibration method, device and readable storage medium for areal density measuring instrument |
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