CN111579086A - Remote infrared temperature measurement precision correction method based on distance compensation - Google Patents
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
The invention discloses a distance compensation-based remote infrared temperature measurement precision correction method, which comprises the steps of setting a sensor as an origin of coordinates and establishing a space rectangular coordinate system; sequentially increasing the distance from the near to the far of an object to be measured by 10cm according to the horizontal direction; measuring the horizontal distance, the vertical distance and the linear distance of an object to be measured in the space; drawing a relation curve of the linear distance of an object to be measured in the space and a measured temperature value on software; randomly changing the position of an object to be detected in space, and recording random point positions; measuring the horizontal distance, the vertical distance and the linear distance of an object to be measured at random point positions in a space; measuring a measured temperature value and a real temperature value of an object to be measured at random point positions in a measurement space; setting a segmented polynomial formula to be fitted, and constructing a final temperature correction formula according to the linear distance of an object to be measured at random point positions in space, a measured temperature value and a real temperature value; the method has the characteristics of simple and quick processing method, no need of a large amount of data, low cost and the like.
Description
Technical Field
The invention relates to the field of infrared temperature measurement technology and the like, in particular to a distance compensation-based remote infrared temperature measurement precision correction method.
Background
The infrared sensor has important application in production and life by virtue of the characteristic of high precision. The temperature measuring principle of the infrared heat sensor is the blackbody radiation law, all objects higher than absolute zero in nature radiate energy continuously, the magnitude of the outward radiation energy of the object and the distribution of the outward radiation energy according to the wavelength are closely related to the surface temperature of the object, and the higher the temperature of the object is, the stronger the emitted infrared radiation capability is. By utilizing the radiation heat effect, the temperature change is increased after the detection device receives the radiation energy, and the performance of one column in the sensor and the temperature is changed. Detecting a change in one of the properties detects the radiation and thereby measures the temperature of the target.
Although the infrared sensor has the advantages of high accuracy, high sensitivity and the like, the accuracy of the infrared sensor is easily affected by factors such as the characteristics (such as angle) of the sensor, air concentration, air humidity, ambient temperature, detection distance and the like, and the influence degrees of different factors are different, so that it is particularly important to correct the temperature data measured by the sensor. In a uniform medium, because the air concentration, the humidity and the like are the same everywhere, the detection distance becomes the largest influence factor influencing the temperature measurement precision of the infrared sensor. Most of the existing temperature correction methods only ignore distance factors aiming at the influence of ambient temperature, but the distance correction-based method is very limited in range, the distance compensation is single compensation, the fitted correction formula is a linear formula, but due to the nonlinear characteristic of the temperature sensor, the result obtained by using the linear correction formula has larger error.
Patent I613426 patent of the invention proposes a non-contact medical thermometer device and a method of temperature compensation comprising an IR sensor, a distance sensor and an infrared thermometer and microprocessor assembly. The method is only aimed at medical scenes and has no universality. Patent CN104568157A proposes a device for improving infrared temperature measurement accuracy, which includes a depth camera, a thermal infrared imager, a scorer and a data processing unit. The data processing unit is used for matching the depth image and the thermal image obtained by the depth camera and performing distance compensation on each temperature measuring point. The depth camera in the device is sensitive to illumination factors such as sunlight, and in addition, the resolution of the depth image and the thermal imaging are not matched, so that the compensation value of the temperature measuring point has errors.
Disclosure of Invention
The invention aims to provide a distance compensation-based remote infrared temperature measurement precision correction method, which adopts a sectional polynomial fitting mode, utilizes a high-precision distance sensor to obtain a distance, utilizes an infrared sensor to obtain a temperature, and carries out distance compensation on the temperature so as to achieve the aim of accurately measuring the temperature.
The invention is realized by the following technical scheme: a distance compensation-based remote infrared temperature measurement precision correction method comprises the following steps:
1) setting a sensor as an origin of coordinates, and establishing a space rectangular coordinate system;
2) sequentially increasing the distance of an object to be measured by 5-30 cm from near to far according to the horizontal direction, and preferably sequentially increasing the distance by 10 cm;
3) measuring the horizontal distance, the vertical distance and the linear distance of an object to be measured in the space;
4) drawing a relation curve of the linear distance of an object to be measured in the space and a measured temperature value on software;
5) randomly changing the position of an object to be detected in space, and recording random point positions;
6) measuring the horizontal distance, the vertical distance and the linear distance of an object to be measured at random point positions in a space;
7) measuring a measured temperature value and a real temperature value of an object to be measured at random point positions in a measurement space;
8) and setting a segmentation polynomial formula to be fitted, and constructing a final temperature correction formula according to the linear distance of the object to be measured at the random point position in the space, the measured temperature value and the real temperature value.
In order to further realize the invention, the following arrangement mode is adopted: and in the step 1), sensors including an infrared sensor and a laser ranging sensor are fixed together to serve as the origin of coordinates of a space rectangular coordinate system.
In order to further realize the invention, the following arrangement mode is adopted: and 3) specifically, measuring the horizontal distance and the vertical distance from the object to be measured to the infrared sensor in the space in the step 2) by using a laser ranging sensor, and calculating the linear distance from the object to be measured to the infrared sensor in the space.
In order to further realize the invention, the following arrangement mode is adopted: the step 4) is specifically as follows: drawing a relation curve between the linear distance from the object to be measured to the infrared sensor in the space and the temperature value measured by the infrared sensor on MTLAB software, searching the position where the relation curve is greatly attenuated, and determining the fitted segmentation point dist 1.
In order to further realize the invention, the following arrangement mode is adopted: the step 5) is specifically as follows: the position of the target to be detected is randomly changed in the space, and random point positions of A0, A1, A2, A3, … and An are recorded.
In order to further realize the invention, the following arrangement mode is adopted: the step 6) is specifically as follows: and measuring the horizontal distance and the vertical distance of the object to be measured at the random point position in the space by using the laser ranging sensor, and calculating the linear distances from the object to be measured at the random point position in the space to the infrared sensor, and recording the linear distances as d0, d1, d2, d3 and … dn.
In order to further realize the invention, the following arrangement mode is adopted: and the measured temperature values of the object to be measured at the random point positions in the space are recorded as M0, M1, M2, M3, M4 and … Mn, and the real temperature values of the object to be measured at the random point positions in the space are measured by the near point of the high-precision thermodetector and recorded as T0, T1, T2, T3, T4 and … Tn.
In order to further realize the invention, the following arrangement mode is adopted: if d0< dist1, the piecewise polynomial formula to be fitted is:
if d0> dist1, then:
in order to further realize the invention, the following arrangement mode is adopted: the step of constructing a final temperature correction formula according to the linear distance of the object to be measured at the random point position in the space, the measured temperature value and the real temperature value is specifically as follows;
8.1) substituting the linear distance, the measured temperature value and the real temperature value of the object to be measured at the random point position in the space into a polynomial formula to be fitted respectively, utilizing Matlab software and applying a least square method, and when the mean square error sum is minimum:
determining the values of polynomial coefficients k0, k1, k2 and k 3;
8.2) substituting the polynomial coefficients k0, k1, k2 and k3 to obtain the final temperature correction formula
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention adopts the high-precision laser distance measuring sensor, thereby avoiding the secondary error caused by using the common distance sensor; after the infrared sensor exceeds a certain distance range, the temperature attenuation value is greatly increased, and the temperature characteristic curve is nonlinear, so that in order to improve the fitting accuracy, a piecewise polynomial fitting is used for fitting the nonlinear curve of which the temperature is attenuated along with the distance, the relation between the measured temperature and the actual temperature value of the target to be measured is determined, and the purpose of temperature compensation of distance change is achieved.
(2) The invention is segmented on the basis of polynomial fitting, avoids the defects of single linear fitting and polynomial fitting, ensures better fitting effect and reduces the error after temperature correction.
(3) The processing method of the invention is simple and convenient, does not need a large amount of data and has low cost.
Drawings
FIG. 1 is a temperature chart illustrating temperature and distance measurements taken using an MLX90640 sensor.
FIG. 2 is a graph showing the relationship between the linear distance and the infrared temperature measurement value based on FIG. 1.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1:
the invention designs a distance compensation-based remote infrared temperature measurement precision correction method, which adopts a sectional polynomial fitting mode, utilizes a high-precision distance sensor to obtain a distance, utilizes an infrared sensor to obtain a temperature, and carries out distance compensation on the temperature so as to achieve the aim of accurately measuring the temperature, and particularly adopts the following setting mode: the method comprises the following steps:
1) setting a sensor as an origin of coordinates, and establishing a space rectangular coordinate system;
2) sequentially increasing the distance of an object to be measured by 5-30 cm from near to far according to the horizontal direction, and preferably sequentially increasing the distance by 10 cm;
3) measuring the horizontal distance, the vertical distance and the linear distance of an object to be measured in the space;
4) drawing a relation curve of the linear distance of an object to be measured in the space and a measured temperature value on software;
5) randomly changing the position of an object to be detected in space, and recording random point positions;
6) measuring the horizontal distance, the vertical distance and the linear distance of an object to be measured at random point positions in a space;
7) measuring a measured temperature value and a real temperature value of an object to be measured at random point positions in a measurement space;
8) and setting a segmentation polynomial formula to be fitted, and constructing a final temperature correction formula according to the linear distance of the object to be measured at the random point position in the space, the measured temperature value and the real temperature value.
Example 2:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to better implement the present invention, the following setting manner is particularly adopted: and in the step 1), sensors including an infrared sensor and a laser ranging sensor are fixed together to serve as the origin of coordinates of a space rectangular coordinate system.
Example 3:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to better implement the present invention, the following setting manner is particularly adopted: and 3) specifically, measuring the horizontal distance and the vertical distance from the object to be measured to the infrared sensor in the space in the step 2) by using a laser ranging sensor, and calculating the linear distance from the object to be measured to the infrared sensor in the space.
Example 4:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to better implement the present invention, the following setting manner is particularly adopted: the step 4) is specifically as follows: drawing a relation curve between the linear distance from an object to be measured to the infrared sensor in the space and the temperature value measured by the infrared sensor on MTLAB software, searching for the position where the relation curve is greatly attenuated, setting each point position within the interval of 0-300 cm and at the interval of 10cm as shown in figure 1, determining the fitted segmentation point dist1 by adopting the temperature values of the temperature and the distance acquired by the MLX90640 sensor, and obviously attenuating the image at the position where the distance is 110cm as shown in figure 2.
Example 5:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to better implement the present invention, the following setting manner is particularly adopted: the step 5) is specifically as follows: the position of the target to be measured is randomly changed in space, random points A0, A1, A2, A3, … and An are recorded, and when the point is moved, the moved position cannot be repeated.
Example 6:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to better implement the present invention, the following setting manner is particularly adopted: the step 6) is specifically as follows: and measuring the horizontal distance and the vertical distance of the object to be measured at the random point position in the space by using the laser ranging sensor, and calculating the linear distances from the object to be measured at the random point position in the space to the infrared sensor, and recording the linear distances as d0, d1, d2, d3 and … dn.
Example 7:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to better implement the present invention, the following setting manner is particularly adopted: and measuring temperature values of the object to be measured at random point positions (A0, A1, A2, A3, … and An points) in the space as M0, M1, M2, M3, M4 and … Mn, and measuring the real temperature values of the object to be measured at the random point positions in the space through the near points of a high-precision thermometer and recording the real temperature values as T0, T1, T2, T3, T4 and … Tn.
Example 8:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to better implement the present invention, the following setting manner is particularly adopted: if d0< dist1, the piecewise polynomial formula to be fitted is:
if d0> dist1, then:
wherein k0, k1, k2 and k3 are polynomial coefficients, TiIs the display value of the ith high-precision thermodetector, MiThe display value of the ith infrared sensor, diThe linear distance between the infrared sensor and the target to be measured. The reason for setting the highest power of the polynomial to be three is that the influence of factors such as distance, ambient gas concentration, humidity and the like is the variable quantity in units of lines, surfaces and volumes, and the serious dragon lattice phenomenon which occurs when the power is higher than three is avoided, so that the predicted value of the formula temperature and the actual value of the formula temperature have larger deviation.
Example 9:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to better implement the present invention, the following setting manner is particularly adopted: the step of constructing a final temperature correction formula according to the linear distance of the object to be measured at the random point position in the space, the measured temperature value and the real temperature value is specifically as follows;
8.1) substituting the linear distance, the measured temperature value and the real temperature value of the object to be measured at the random point position in the space into a polynomial formula to be fitted respectively, utilizing Matlab software and applying a least square method, and when the mean square error sum is minimum:
determining the values of polynomial coefficients k0, k1, k2 and k 3;
8.2) substituting the polynomial coefficients k0, k1, k2 and k3 to obtain the final temperature correction formula
Wherein, TpreThe correction value of the infrared sensor is obtained, M is the measured value of the infrared sensor, and d is the linear distance between the object to be measured and the infrared sensor in the space.
Example 10:
the embodiment is further optimized on the basis of any one of the above embodiments, and a distance compensation-based remote infrared temperature measurement precision correction method comprises the following steps:
1. and fixing the infrared sensor and the laser ranging sensor, placing the infrared sensor and the laser ranging sensor together to serve as an origin O, and establishing a space rectangular coordinate system.
2. And sequentially increasing the distance of 10cm from the near to the far of the object to be measured according to the horizontal direction.
3. And measuring the horizontal distance and the vertical distance from the object to be measured to the infrared sensor in the space in the step by using a laser ranging sensor, and calculating the linear distance from the object to be measured to the infrared sensor in the space.
4. And drawing a relation curve between the linear distance from the object to be measured to the infrared sensor in the space and the temperature value measured by the infrared sensor on MTLAB software. Finding the location where the curve decays significantly, fig. 1 is a temperature table of temperature and distance obtained using the MLX90640 sensor. The fitted segmentation point dist1 is determined. As shown in fig. 2, the image appears significantly attenuated at a distance of 110 cm.
5. The position of the target to be measured is randomly changed in space, and the moving positions of the target to be measured are recorded as points A0, A1, A2, A3, … and An. Note that the position of the movement cannot be repeated.
6. And measuring the horizontal distance and the vertical distance from the object to be measured to the infrared sensor in the space in the step by using a laser ranging sensor, and calculating the linear distances from the object to be measured to the infrared sensor in the space as d0, d1, d2, d3 and … dn.
7. Measuring and recording temperature values of points A0, A1, A2, A3, … and An to be measured by using An infrared sensor, wherein the temperature values are M0, M1, M2, M3, M4 and … Mn, measuring the real temperature of An object to be measured by using a high-precision thermometer at a near point, and recording the real temperature as T0, T1, T2, T3, T4 and … Tn
8. Setting a piecewise polynomial formula to be fitted:
if d0< dist1, there are:
if d0> dist1, there are:
wherein k0, k1, k2 and k3 are polynomial coefficients, TiIs the display value of the ith high-precision thermodetector, MiThe display value of the ith infrared sensor, diThe linear distance between the infrared sensor and the target to be measured. The reason for setting the highest power of the polynomial to be three is that the influence of factors such as distance, ambient gas concentration, humidity and the like is the variable quantity in units of lines, surfaces and volumes, and the serious dragon lattice phenomenon which occurs when the power is higher than three is avoided, so that the predicted value of the formula temperature and the actual value of the formula temperature have larger deviation.
9. Respectively substituting distance data (d0, d1, d2, d3, … dn) measured by a laser ranging sensor, temperature measurement data (M0, M1, M2, M3, M4, … Mn) of an infrared sensor, near-point measured temperature data (T0, T1, T2, T3, T4, … Tn) of a high-precision thermometer into a polynomial formula to be fitted, and applying a least square method by using Matlab software when the sum of mean square errors is minimum:
the values of the coefficients k0, k1, k2, k3 were determined.
10. Substituting the coefficients k0, k1, k2 and k3 to obtain the final temperature correction formula
TpreThe correction value of the infrared sensor is obtained, M is the measured value of the infrared sensor, and d is the linear distance between the object to be measured and the infrared sensor in the space.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. A remote infrared temperature measurement precision correction method based on distance compensation is characterized by comprising the following steps: the method comprises the following steps:
1) setting a sensor as an origin of coordinates, and establishing a space rectangular coordinate system;
2) sequentially increasing the distance from the near to the far of an object to be measured by 5-30 cm according to the horizontal direction;
3) measuring the horizontal distance, the vertical distance and the linear distance of an object to be measured in the space;
4) drawing a relation curve of the linear distance of an object to be measured in the space and a measured temperature value on software;
5) randomly changing the position of an object to be detected in space, and recording random point positions;
6) measuring the horizontal distance, the vertical distance and the linear distance of an object to be measured at random point positions in a space;
7) measuring a measured temperature value and a real temperature value of an object to be measured at random point positions in a measurement space;
8) and setting a segmentation polynomial formula to be fitted, and constructing a final temperature correction formula according to the linear distance of the object to be measured at the random point position in the space, the measured temperature value and the real temperature value.
2. The distance compensation-based remote infrared temperature measurement precision correction method according to claim 1, characterized in that: and in the step 1), sensors including an infrared sensor and a laser ranging sensor are fixed together to serve as the origin of coordinates of a space rectangular coordinate system.
3. The distance compensation-based remote infrared temperature measurement precision correction method according to claim 1 or 2, characterized in that: and 3) specifically, measuring the horizontal distance and the vertical distance from the object to be measured to the infrared sensor in the space in the step 2) by using a laser ranging sensor, and calculating the linear distance from the object to be measured to the infrared sensor in the space.
4. The distance compensation-based remote infrared temperature measurement precision correction method according to claim 1 or 2, characterized in that: the step 4) is specifically as follows: drawing a relation curve between the linear distance from the object to be measured to the infrared sensor in the space and the temperature value measured by the infrared sensor on MTLAB software, searching the position where the relation curve is greatly attenuated, and determining the fitted segmentation point dist 1.
5. The distance compensation-based remote infrared temperature measurement precision correction method according to claim 1 or 2, characterized in that: the step 5) is specifically as follows: the position of the target to be detected is randomly changed in the space, and random point positions of A0, A1, A2, A3, … and An are recorded.
6. The distance compensation-based remote infrared temperature measurement precision correction method according to claim 1 or 2, characterized in that: the step 6) is specifically as follows: and measuring the horizontal distance and the vertical distance of the object to be measured at the random point position in the space by using the laser ranging sensor, and calculating the linear distances from the object to be measured at the random point position in the space to the infrared sensor, and recording the linear distances as d0, d1, d2, d3 and … dn.
7. The distance compensation-based remote infrared temperature measurement precision correction method according to claim 1 or 2, characterized in that: and the measured temperature values of the object to be measured at the random point positions in the space are recorded as M0, M1, M2, M3, M4 and … Mn, and the real temperature values of the object to be measured at the random point positions in the space are measured by the near point of the high-precision thermodetector and recorded as T0, T1, T2, T3, T4 and … Tn.
8. The distance compensation-based remote infrared temperature measurement precision correction method according to claim 4, characterized in that: if d0< dist1, the piecewise polynomial formula to be fitted is:
if d0> dist1, then:
9. the method for correcting the precision of the remote infrared temperature measurement based on the distance compensation as claimed in claim 1, 2 or 8, wherein: the step of constructing a final temperature correction formula according to the linear distance of the object to be measured at the random point position in the space, the measured temperature value and the real temperature value is specifically as follows;
8.1) substituting the linear distance, the measured temperature value and the real temperature value of the object to be measured at the random point position in the space into a polynomial formula to be fitted respectively, utilizing Matlab software and applying a least square method, and when the mean square error sum is minimum:
determining the values of polynomial coefficients k0, k1, k2 and k 3;
8.2) substituting the polynomial coefficients k0, k1, k2 and k3 to obtain the final temperature correction formula
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| CN112229540A (en) * | 2020-10-14 | 2021-01-15 | 拉扎斯网络科技（上海）有限公司 | Information acquisition method, device and equipment |
| CN114281131A (en) * | 2021-12-20 | 2022-04-05 | 广东美的厨房电器制造有限公司 | Temperature control method, electric appliance and computer readable storage medium |
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