CN113340427A - Calibration method of infrared imaging module based on distance correction - Google Patents
Calibration method of infrared imaging module based on distance correction Download PDFInfo
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- CN113340427A CN113340427A CN202110554653.4A CN202110554653A CN113340427A CN 113340427 A CN113340427 A CN 113340427A CN 202110554653 A CN202110554653 A CN 202110554653A CN 113340427 A CN113340427 A CN 113340427A
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- 238000003331 infrared imaging Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 43
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 20
- 238000005286 illumination Methods 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 230000005855 radiation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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Abstract
The invention discloses a calibration method of an infrared imaging module based on distance correction, and belongs to the technical field of infrared imaging. The method comprises the steps of setting a plurality of different measuring distances, carrying out a plurality of times of infrared temperature measurement on the same target by using an infrared imaging module to be calibrated at each measuring distance, recording the central temperature measured by the infrared imaging module in each measuring, and subtracting the central temperature measured each time from the actual central temperature of the target to obtain the measuring error of each measuring; then, performing mean value fitting on each measurement error to obtain the relation between the measurement error and the measurement distance; during actual temperature measurement, the corresponding measurement error under the distance is calculated according to the actual measurement distance and the relation between the measurement error and the measurement distance, so that the measurement data is corrected. The method firstly measures and quantifies the infrared measurement error of the target object at different distances, and improves the accuracy of infrared temperature measurement by correcting the error in practical use.
Description
Technical Field
The invention relates to a calibration method of an infrared imaging module based on distance correction, and belongs to the technical field of infrared imaging.
Background
Infrared imaging is a technique of imaging using infrared rays. Infrared refers to electromagnetic waves longer than 0.78 microns and is referred to as infrared, also known as infrared radiation, because it is outside the red color of the visible spectrum. Among them, a portion having a wavelength of 0.78 to 2.0 μm is called near infrared, and a portion having a wavelength of 2.0 to 1000 μm is called thermal infrared.
In nature, all objects can radiate infrared rays, so that infrared images formed by different thermal infrared rays can be obtained by measuring the infrared ray difference between a target and a background by using an infrared detector. Specifically, the infrared detector converts power signals radiated by an object into electric signals, so that output signals of the imaging device completely simulate the spatial distribution of the surface temperature of the scanned object in a one-to-one correspondence manner, the spatial distribution is processed by an electronic system and transmitted to a display screen, and a thermograph corresponding to the surface thermal distribution of the object can be obtained. By using the method, the remote thermal state image imaging and temperature measurement of the target can be realized, and the target is analyzed and judged.
However, the infrared energy intensity received by the infrared imaging module is affected by heat sources, relative distances, environments and other factors, and shows different attenuation trends, and the current method for correcting the target temperature through the blackbody distance coefficient has an unsatisfactory correction effect.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a calibration method of an infrared imaging module based on distance correction, which can effectively correct infrared detection temperature and realize a more real infrared imaging effect.
In order to achieve the above purpose, the invention provides the following technical scheme:
a calibration method of an infrared imaging module based on distance correction comprises the following steps:
(1) setting a plurality of different measuring distances, carrying out a plurality of times of infrared temperature measurement on the same target by using an infrared imaging module to be calibrated at each measuring distance, recording the central temperature measured by the infrared imaging module in each time of measurement, and subtracting the central temperature measured in each time from the actual central temperature of the target to obtain the measuring error of each time of measurement;
(2) performing mean value fitting on each measurement error through a first illumination law to obtain the relation between the measurement error and the measurement distance;
(3) during actual temperature measurement, the corresponding measurement error under the distance is calculated according to the actual measurement distance and the relation between the measurement error and the measurement distance, so that the measurement data is corrected.
Furthermore, in the step (1), a plurality of different measuring distances are set in such a way that the effective temperature measuring distance d of the infrared imaging module to be calibrated is equally divided into N sections, N is more than or equal to 10, and d/N,2d/N, d.
Further, in step (1), at least 5 infrared temperature measurements are made on the same target at each measurement distance.
As can be seen from the above description, the technical scheme of the invention has the beneficial effects that:
1. the invention reduces the error of infrared temperature measurement by distance correction and improves the accuracy of infrared temperature measurement.
2. The existing infrared imaging module can accurately measure temperature only at a short distance, and by adopting the method disclosed by the invention, the temperature measurement result is corrected, so that more accurate measured temperature can be obtained at a longer distance, and the temperature measurement distance range of the infrared imaging module is expanded.
3. The method can be suitable for infrared temperature measurement of dynamic targets in a temperature measurement range.
Drawings
FIG. 1 is a graph of the mean calculation result in the embodiment of the present invention.
FIG. 2 is a graph of fitting results in an embodiment of the present invention.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present patent for those skilled in the art, the technical solutions of the present patent are further described in the form of specific examples with reference to the accompanying drawings.
A calibration method of an infrared imaging module based on distance correction comprises the following steps:
(1) setting a plurality of different measuring distances, carrying out a plurality of times of infrared temperature measurement on the same target by using an infrared imaging module to be calibrated at each measuring distance, recording the central temperature measured by the infrared imaging module in each time of measurement, and subtracting the central temperature measured in each time from the actual central temperature of the target to obtain the measuring error of each time of measurement;
(2) performing mean value fitting on each measurement error through a first illumination law to obtain the relation between the measurement error and the measurement distance;
(3) during actual temperature measurement, the corresponding measurement error under the distance is calculated according to the actual measurement distance and the relation between the measurement error and the measurement distance, so that the measurement data is corrected.
Furthermore, in the step (1), a plurality of different measuring distances are set in such a way that the effective temperature measuring distance d of the infrared imaging module to be calibrated is equally divided into N sections, N is more than or equal to 10, and d/N,2d/N, d.
Further, in step (1), at least 5 infrared temperature measurements are made on the same target at each measurement distance.
The following is a more specific example:
a calibration method of an infrared imaging module based on distance correction comprises the following steps:
(1) setting the distance to be 12 sections, measuring the infrared data of the target at each distance, and measuring for 6 times at each distance to obtain a measured temperature and actual temperature difference table:
| distance (cm) | 1 | 2 | 3 | 4 | 5 | 6 |
| 80 | 0.383 | 0.883 | 0.583 | 1.083 | 0.883 | 0.583 |
| 160 | 0.333 | 0.583 | 0.533 | 0.783 | 0.783 | 0.483 |
| 240 | 0.383 | 0.483 | 0.583 | 0.683 | 0.283 | 0.183 |
| 320 | 0.183 | 0.313 | 0.383 | 0.513 | 0.183 | -0.017 |
| 400 | -0.117 | 0.083 | 0.083 | 0.283 | -0.217 | -0.117 |
| 480 | -0.217 | -0.267 | -0.017 | -0.067 | -0.617 | -0.217 |
| 560 | -0.317 | -0.217 | -0.117 | -0.017 | -0.617 | -0.217 |
| 640 | -0.317 | -0.267 | -0.117 | -0.067 | -0.717 | -0.617 |
| 720 | -0.517 | -0.567 | -0.317 | -0.367 | -0.817 | -0.517 |
| 800 | -0.917 | -0.617 | -0.717 | -0.417 | -1.117 | -0.817 |
| 880 | -1.117 | -0.917 | -0.917 | -0.717 | -1.317 | -1.217 |
| 960 | -0.817 | -0.717 | -0.617 | -0.517 | -1.717 | -1.417 |
(2) Performing mean value fitting on the in-table data by using a mathematical calculation tool according to a first illumination law, wherein the mean value calculation result is shown in figure 1, and the fitting result is shown in figure 2;
(3) and (3) measuring infrared data of the target at a position of 120cm to obtain a measured temperature value of 32.71 ℃, calculating by using a fitting formula to obtain an error of 0.62902 at the distance, wherein the corrected temperature value is 32.08 ℃, and the error of the corrected temperature value and the actual target temperature of 32 ℃ is 0.08 ℃.
In a word, the infrared measurement method firstly measures and quantifies the infrared measurement errors of the target object at different distances, and improves the accuracy of infrared temperature measurement by correcting the errors during actual use.
It should be noted that the above embodiments are only specific examples of the implementation schemes of this patent, and do not cover all the implementation schemes of this patent, and therefore, the scope of protection of this patent cannot be considered as limited; all the implementations which belong to the same concept as the above cases or the combination of the above schemes are within the protection scope of the patent.
Claims (3)
1. A calibration method of an infrared imaging module based on distance correction is characterized by comprising the following steps:
(1) setting a plurality of different measuring distances, carrying out a plurality of times of infrared temperature measurement on the same target by using an infrared imaging module to be calibrated at each measuring distance, recording the central temperature measured by the infrared imaging module in each time of measurement, and subtracting the central temperature measured in each time from the actual central temperature of the target to obtain the measuring error of each time of measurement;
(2) performing mean value fitting on each measurement error through a first illumination law to obtain the relation between the measurement error and the measurement distance;
(3) during actual temperature measurement, the corresponding measurement error under the distance is calculated according to the actual measurement distance and the relation between the measurement error and the measurement distance, so that the measurement data is corrected.
2. The method for calibrating the infrared imaging module based on the distance correction as claimed in claim 1, wherein: in the step (1), a plurality of different measuring distances are set in a manner that the effective temperature measuring distance d of the infrared imaging module to be calibrated is equally divided into N sections, N is more than or equal to 10, and d/N,2d/N,.
3. The method for calibrating the infrared imaging module based on the distance correction as claimed in claim 1, wherein: in step (1), at least 5 infrared temperature measurements are made of the same target at each measurement distance.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114235168A (en) * | 2021-11-19 | 2022-03-25 | 武汉高德智感科技有限公司 | Infrared temperature measurement method and system |
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| CN114235168A (en) * | 2021-11-19 | 2022-03-25 | 武汉高德智感科技有限公司 | Infrared temperature measurement method and system |
| CN114235168B (en) * | 2021-11-19 | 2023-03-10 | 武汉高德智感科技有限公司 | Infrared temperature measurement method and system |
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Application publication date: 20210903 |