CN113155289A - Thermal infrared imager and correction method thereof - Google Patents
Thermal infrared imager and correction method thereof Download PDFInfo
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- CN113155289A CN113155289A CN202110143438.5A CN202110143438A CN113155289A CN 113155289 A CN113155289 A CN 113155289A CN 202110143438 A CN202110143438 A CN 202110143438A CN 113155289 A CN113155289 A CN 113155289A
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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
- 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
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Abstract
The application discloses a correction method of a thermal infrared imager and the thermal infrared imager, wherein the method comprises the steps of acquiring an initial gray value of a target object acquired by the thermal infrared imager, and the difference value between the acquisition time of the initial gray value and the starting-up time of the thermal infrared imager is not more than a preset time threshold; acquiring a measured temperature value of the thermal infrared imager; determining a gray value adjustment value corresponding to the temperature value according to a preset calculation rule; generating a target gray value according to the gray value adjustment value and the initial gray value; the temperature of the target object is determined according to the preset conversion rule of the temperature and the gray value and the target gray value, the temperature change of the thermal infrared imager is prevented from influencing the measured temperature, the accurate temperature can be measured after the infrared thermal imager is started, and the use efficiency is improved.
Description
Technical Field
The invention relates to the technical field of infrared thermal imaging, in particular to a thermal infrared imager and a correction method thereof.
Background
Any object with a temperature above absolute zero (-273.15 c) emits infrared radiation (thermal radiation) without stopping. The infrared radiation is an electromagnetic wave with the wavelength ranging from 0.7 mu m to 1000 mu m, and the wavelength of the object radiated by the infrared radiation is different at different temperatures. The thermal infrared temperature measurement imager can capture infrared radiation and then convert the infrared radiation into an electric signal, and the electric signal is processed by an algorithm to finally output temperature information.
The infrared temperature measurement thermal imager has the advantages of non-contact, high temperature measurement precision, rapidness, convenience and the like, and is widely applied to the fields of petrochemical industry, medical identification, electric power safety and the like. If the temperature correction is not carried out, the temperature of the thermal infrared temperature measurement imager is stable after the infrared temperature measurement imager is started for 30min, and the temperature of the target can be accurately and reliably measured by using the thermal infrared temperature measurement imager after the temperature is stable. However, the waiting time brings great inconvenience to the use, so how to make the temperature measurement accurate after the computer is started is a technical problem to be solved in the field.
Disclosure of Invention
In order to solve the defects of the prior art, the invention mainly aims to provide a correction method of a thermal infrared imager, which comprises the following steps:
acquiring an initial gray value of a target object acquired by a thermal infrared imager, wherein the difference between the acquisition time of the initial gray value and the starting-up time of the thermal infrared imager is not more than a preset time threshold;
acquiring a measured temperature value of the thermal infrared imager;
determining a gray value adjustment value corresponding to the temperature value according to a preset calculation rule;
generating a target gray value according to the gray value adjustment value and the initial gray value;
and determining the temperature of the target object according to a preset conversion rule of the temperature and the gray value and the target gray value.
In some embodiments, the acquiring the initial gray values of the target object collected by the thermal infrared imager includes:
determining an initial gray value of a target object according to infrared radiation of the target object acquired by a detector of a thermal infrared imager;
the acquiring of the measured temperature value of the thermal infrared imager comprises:
and acquiring a measured temperature value of a preset component, wherein the detector is arranged on the preset component.
In some embodiments, the determining the temperature of the target object according to the preset conversion rule of the temperature and the gray scale value and the target gray scale value includes:
generating an initial temperature according to a preset conversion rule of the temperature and the gray value and the target gray value;
and determining the temperature of the target object according to a preset temperature compensation parameter corresponding to the distance between the thermal infrared imager and the target object and the initial temperature.
In some embodiments, the determining the temperature of the target object according to the preset temperature compensation parameter corresponding to the distance between the thermal infrared imager and the target object and the initial temperature includes:
and determining the temperature of the target object according to the ambient humidity of the thermal infrared imager, the corresponding preset temperature compensation parameter and the initial temperature.
In some embodiments, the preset time threshold is 30 minutes.
In a second aspect, the present application provides a correction device for a thermal infrared imager, the device comprising:
the system comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring an initial gray value of a target object acquired by a thermal infrared imager, and the difference value between the acquisition time of the initial gray value and the starting-up time of the thermal infrared imager is not more than a preset time threshold; acquiring a measured temperature value of the thermal infrared imager;
the calculation module is used for determining a gray value change coefficient corresponding to the temperature value according to a preset calculation rule; determining a corresponding gray value adjustment value according to the gray value change coefficient and the temperature value; generating a target gray value according to the gray value adjustment value and the initial gray value;
and the judgment module is used for determining the temperature of the target object according to a preset conversion rule of the temperature and the gray value and the target gray value.
In a third aspect, the present application provides a thermal infrared imager, comprising:
the detector is used for collecting infrared radiation of a target object;
the detector is arranged on the presetting component;
the temperature sensor is used for acquiring the temperature value of the preset component;
the processing device is used for determining an initial gray value of a target object according to infrared radiation of the target object acquired by a detector of the thermal infrared imager, and the difference value between the acquisition time of the infrared radiation and the starting-up time of the thermal infrared imager is not more than a preset time threshold;
acquiring a temperature value of the preset component acquired by the temperature sensor;
determining a gray value change coefficient corresponding to the temperature value according to a preset calculation rule;
determining a corresponding gray value adjustment value according to the gray value change coefficient and the temperature value;
generating a target gray value according to the gray value adjustment value and the initial gray value;
and determining the temperature of the target object according to a preset conversion rule of the temperature and the gray value and the target gray value.
In some embodiments, the predetermined component comprises a flange, and the detector is disposed on an outer surface of the flange or embedded within the flange.
In some embodiments, the thermal infrared imager further comprises a lens for focusing infrared radiation emitted by the target object to the detector.
In some embodiments, the processing device may be further configured to generate an initial temperature according to a preset conversion rule between the temperature and the gray scale value and the target gray scale value; and determining the temperature of the target object according to a preset temperature compensation parameter corresponding to the distance between the thermal infrared imager and the target object and the initial temperature.
The invention has the following beneficial effects:
the application provides a correction method of a thermal infrared imager and the thermal infrared imager, wherein the method obtains an initial gray value of a target object acquired by the thermal infrared imager, and the difference between the acquisition time of the initial gray value and the starting time of the thermal infrared imager is not more than a preset time threshold; acquiring a measured temperature value of the thermal infrared imager; determining a gray value adjustment value corresponding to the temperature value according to a preset calculation rule; generating a target gray value according to the gray value adjustment value and the initial gray value; according to the method, the temperature of the target object is determined according to the conversion rule of the preset temperature and the gray value and the target gray value, the temperature of the thermal infrared imager is measured, the corresponding gray value adjustment value is calculated and determined according to the temperature value, the real gray value corresponding to the target object can be determined according to the gray value adjustment value and the initial gray value of the target object, the temperature of the target object can be determined according to the gray value, the effect that the temperature change of the thermal infrared imager has influence on the measured temperature of the target object is avoided, the thermal infrared imager can be started to measure the accurate temperature, and the use efficiency of the thermal infrared imager is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a thermal infrared imager provided in an embodiment of the present application;
FIG. 2 is a schematic view of a flange structure provided in an embodiment of the present application;
FIG. 3 is a schematic view of a thermal infrared imager with a lens removed according to an embodiment of the application;
FIG. 4 is a schematic diagram of a thermal infrared imager provided in an embodiment of the application for measuring temperature;
FIG. 5 is a schematic structural diagram of a thermal infrared imager provided in an embodiment of the present application;
FIG. 6 is a flow chart of a method provided by an embodiment of the present application;
FIG. 7 is a comparison chart of temperature measurement effects of a thermal infrared imager for temperature measurement correction by using the correction method provided by the present application and a thermal infrared imager of the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background art, when a thermal imager is just started, the temperature of the thermal imager itself may change, which may cause inaccurate measured temperature. In order to solve the problems, the application provides a correction method of a thermal infrared imager, which avoids the influence of the temperature change of the thermal infrared imager on the measured temperature of a target object, so that the thermal infrared imager can be started to measure the accurate temperature, and the service efficiency of the thermal infrared imager is improved.
Example one
As shown in fig. 1, the thermal infrared imager provided in the embodiment of the present application includes an optical lens 1, a temperature sensor 2, an infrared detector 3, an information processing module 4, and a flange 5, where the optical lens 1 is configured to converge infrared radiation emitted by a target object whose temperature is to be measured to the infrared detector 3, the infrared detector 3 is configured to generate a corresponding analog signal according to the infrared radiation and send the analog signal to the information processing module 4, and the information processing module 4 generates a corresponding gray value according to the received analog signal and outputs corresponding temperature data according to the gray value. The flange 5 is a common structural component of the thermal infrared imager and is mainly used for fixing an optical lens. The infrared detector may be disposed on an outer surface of the flange or embedded within the flange.
Fig. 2 shows a cross-sectional structure of a flange, and due to the close distance between the flange and the infrared detector, infrared radiation emitted by the flange will have a large influence on the gray level and the temperature degree of the target object measured by the infrared detector. In order to facilitate quantification of the effect of the temperature of the thermal infrared imager on the measured gray values, the temperature of the flange may be considered to be the temperature of the thermal infrared imager. The temperature of any other component of the infrared detector or the average temperature of all components of the infrared detector may also be used as the temperature of the infrared detector, which is not limited in this application. As shown in fig. 1, a temperature sensor 2 may be provided on the flange 5 to measure the temperature of the flange 5. Specifically, the infrared detector may be disposed on any other component, and the temperature sensor may be disposed on the component at the same time to measure the temperature of the component.
The gray value variation coefficient corresponding to each temperature value may be determined in advance through experiments, and the experiment process may include:
a1, as shown in FIG. 3, removing the lens of the thermal infrared imager and making the detector 3 directly face the standard black body radiation source 6, making the standard black body radiation source fill the whole field of view of the thermal infrared imager, and adjusting the temperature of the standard black body radiation source to a preset temperature;
a black body is an object that is capable of absorbing all incident radiation of any wavelength at any temperature, and has a reflectance and transmittance of 0 and an absorptance of 1. The standard blackbody radiation source is a radiation source manufactured according to the blackbody standard, and is an absolute standard for developing infrared equipment.
The thermal infrared imager may be left to stand for a sufficient period of time, for example, one day, to allow the temperature of the thermal infrared imager to stabilize.
A2, starting the thermal infrared imager, collecting infrared radiation by the detector 3 every preset time period, generating a first gray value C _ object _ initial _ aver of the standard blackbody radiation source by the processing device according to the infrared radiation collected by the detector 3, and simultaneously obtaining a temperature value T _ float of a flange collected by the temperature sensor at the same time;
the collection of infrared radiation, the temperature value of the flange and the generation of the gray value can be stopped when the number of the generated gray values meets the preset condition.
Since the detector receives the infrared radiation of the standard blackbody radiation source and the flange at the same time, the output gray value C _ object _ initial is affected by the infrared radiation of the flange and cannot be used for accurately measuring the temperature of the blackbody.
The first gray values C _ object _ inertia _ aver _1, C _ object _ inertia _ aver _2.. C _ object _ inertia _ aver _ m and the corresponding temperature values T _ flap _1, T _ flap _2.. T _ flap _ m of the flange collected at the same time are measured.
A3, after the temperature of the thermal imager core is stable, the detector 3 carries out infrared radiation collection once every preset time period, the processing device generates a second gray value C _ object _ initia _ aver of the standard blackbody radiation source according to the infrared radiation collected by the detector 3, and when the number of the generated second gray values meets a preset condition, the gray value mean value C _ object _ initia _ aver of the second gray value C _ object _ initia _ aver is calculated; preferably, the temperature of the flange can be acquired through the temperature sensor after the thermal infrared imager is started to operate for about 30 minutes, and when the variation of the temperature of the flange within 5min is less than 0.1 ℃, the temperature stability of the core of the thermal infrared imager can be judged. At this time, the temperature of the thermal infrared imager is already stable, so the value of the second gray value C _ object _ initia _ aver collected at this time is no longer affected by the temperature of the flange and tends to be stable.
A4, determining a gray value change coefficient corresponding to each temperature value according to the first gray value and the gray value mean value;
based on the first gray value, the gray value variation coefficient K corresponding to each temperature value can be calculated, i.e., K _ T1 ═ C _ object _ inertia _ tab-C _ object _ inertia _ aver _1)/Delta _ T _ float, K _ T2 ═ C _ object _ inertia _ aver _ tab-C _ object _ inertia _ aver _2)/Delta _ T _ float, K _ T3 ═ C _ object _ inertia _ aver _ tab-C _ object _ inertia _ aver _3)/Delta _ T _ float. Where Delta _ T _ flight represents a preset time value, for example 1 s. The gray value variation coefficient K represents the variation of the gray value with time under the condition of the corresponding temperature value T _ flight. From K _ T1 and K _ T2 … K _ tm, a functional relation K ═ f (T _ flight (T)) of the K value and the temperature value T _ flight can be established. For example, the functional relation may be represented by K ═ q × T _ flare + r, where q and r represent real number parameters fitted from experimentally obtained K values and temperature values.
On the other hand, experiments may be performed in advance to determine the conversion rule of the temperature and the gray scale value, and the experimental process includes:
b1, as shown in FIG. 4, the thermal infrared imager with stable temperature is faced to the standard black body radiation source 6, so that the standard black body radiation source 6 is filled in the whole field of view of the thermal infrared temperature measurement imager;
b2, adjusting the temperature T _ black body of the standard black body radiation source, and recording the gray value average value C _ out output by the processing device of the thermal infrared imager according to the infrared radiation collected by the detector under the temperature of each standard black body radiation source;
b3, establishing a functional relationship between the gray-level value and the temperature value, i.e., g (T _ blackberry), according to T _ blackberry and the corresponding C _ out, wherein the inverse function is T _ blackberry-1(C _ out). For example, the functional relation may be C _ out ═ a × T _ blackberry ^2+ b × T _ blackberry + C; t _ blackberry ═ b + sqrt (b ^2-4 a + C +4 a Cout), where a, b, and C are constant values determined from the T _ blackberry and the corresponding C _ out obtained by the experiment.
Specifically, the process of correcting the temperature measurement result of the thermal infrared imager according to the determined conversion rule of the temperature and the gray value change coefficient corresponding to the temperature value comprises the following steps:
acquiring an initial gray value of a target object acquired by a detector of a thermal infrared imager;
and the difference value between the acquisition time of the initial gray value and the starting-up time of the thermal infrared imager is not more than a preset time threshold. Preferably, the preset time threshold may be 30 minutes.
Acquiring a temperature value of the flange acquired by a temperature sensor;
and the difference between the acquisition time of the temperature value and the acquisition time of the initial gray value does not exceed the corresponding threshold value. For example, the first temperature value may be acquired simultaneously with the initial gray value, or may be acquired before or shortly after the initial gray value is acquired. The short time may be within any time range of not more than 1 second.
Determining a gray value change coefficient corresponding to the temperature value according to a function relation between the gray value change coefficient K value and the temperature value;
determining a corresponding gray value adjustment value according to the gray value change coefficient and a preset time value;
the gray value adjustment value may be obtained according to Delta _ T _ flare × K, where Delta _ T _ flare is a preset time value, for example, 1s, and K may be obtained according to a functional relation K ═ f (T _ flare (T)) and a temperature value T _ flare (T) of the flange.
Fifthly, generating a target gray value according to the gray value adjustment value and the initial gray value;
the target gray-scale value may be represented by C _ object _ initial + Delta _ T _ flash K, where C _ object _ initial represents the original gray-scale value and Delta _ T _ flash K represents the gray-scale value adjustment value.
Sixthly, determining the temperature of the target object according to the target gray value and a preset conversion rule of the temperature and the gray value;
preferably, the initial temperature of the target object may be determined according to the target gray-scale value and a conversion rule between a preset temperature and the gray-scale value. Then determining a corresponding humidity adjustment coefficient according to the thermal infrared imager and the environmental humidity of the environment where the target object is located; determining corresponding distance temperature compensation parameters according to the distance between the thermal infrared imager and the target object; and determining the temperature of the target object according to the humidity adjustment coefficient, the distance temperature compensation parameter and the initial temperature so as to further improve the accuracy of the temperature measurement result.
FIG. 7 is a comparison chart of temperature measurement effects of a thermal infrared imager for temperature measurement correction by using the correction method provided by the present application and a thermal infrared imager of the prior art. The broken line represents the temperature measurement result of the thermal infrared imager for temperature measurement correction by using the correction method provided by the application on the standard blackbody radiation source at 35 ℃, the solid line represents the temperature measurement result of the traditional thermal infrared imager for temperature measurement correction without using the correction method provided by the application on the standard blackbody radiation source at 35 ℃, and the test environment is indoor temperature of 25 ℃ and humidity of 36.9%. During testing, the thermal infrared temperature measurement imager is arranged on the bracket and is arranged at a position 4m away from the black body. The imaging center temperature measuring point of the thermal infrared imager is aligned to the central point of the black body, the distance compensation parameter of the thermal infrared imager is set to be 4m, the thermal infrared imager is powered off in advance and stands for more than 12 hours to enable the thermal infrared imager to be fully balanced with the environment, and then the thermal infrared imager is powered on and started to collect data. According to the graph 7, the error between the temperature measurement result and the actual value at 35 ℃ is not less than the preset error range requirement until the thermal infrared imager which is not corrected by the correction method provided by the scheme is started and starts to measure the temperature for 24 minutes; the error between the temperature measurement result of the thermal infrared imager adopting the correction method provided by the application and the actual value at 35 ℃ after the thermal infrared imager is started for 1 minute is smaller than the preset error range requirement, so that the effect that the temperature measurement is accurate after the thermal infrared imager is started is realized.
Example two
Corresponding to the above embodiment, as shown in fig. 6, the present application provides a method for correcting a thermal infrared imager, where the method includes:
610. acquiring an initial gray value of a target object acquired by a thermal infrared imager, wherein the difference between the acquisition time of the initial gray value and the starting-up time of the thermal infrared imager is not more than a preset time threshold;
620. acquiring a measured temperature value of the thermal infrared imager;
preferably, the acquiring the initial gray value of the target object acquired by the thermal infrared imager includes:
621. determining an initial gray value of a target object according to infrared radiation of the target object acquired by a detector of a thermal infrared imager;
the acquiring of the measured temperature value of the thermal infrared imager comprises:
622. and acquiring a measured temperature value of a preset component, wherein the detector is arranged on the preset component.
630. Determining a gray value adjustment value corresponding to the temperature value according to a preset calculation rule;
640. generating a target gray value according to the gray value adjustment value and the initial gray value;
650. and determining the temperature of the target object according to a preset conversion rule of the temperature and the gray value and the target gray value.
Preferably, the determining the temperature of the target object according to the preset conversion rule of the temperature and the gray scale value and the target gray scale value includes:
651. generating an initial temperature according to a preset conversion rule of the temperature and the gray value and the target gray value;
652. and determining the temperature of the target object according to a preset temperature compensation parameter corresponding to the distance between the thermal infrared imager and the target object and the initial temperature.
Preferably, the determining the temperature of the target object according to the preset temperature compensation parameter corresponding to the distance between the thermal infrared imager and the target object and the initial temperature includes:
653. and determining the temperature of the target object according to the ambient humidity of the thermal infrared imager, the corresponding preset temperature compensation parameter and the initial temperature.
Preferably, the preset time threshold is 30 minutes.
EXAMPLE III
Corresponding to the above embodiments, the present application provides a correction device for a thermal infrared imager, the device includes:
the system comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring an initial gray value of a target object acquired by a thermal infrared imager, and the difference value between the acquisition time of the initial gray value and the starting-up time of the thermal infrared imager is not more than a preset time threshold; acquiring a measured temperature value of the thermal infrared imager;
the calculation module is used for determining a gray value change coefficient corresponding to the temperature value according to a preset calculation rule; determining a corresponding gray value adjustment value according to the gray value change coefficient and the temperature value; generating a target gray value according to the gray value adjustment value and the initial gray value;
and the judgment module is used for determining the temperature of the target object according to a preset conversion rule of the temperature and the gray value and the target gray value.
Preferably, the acquisition module can be further used for determining an initial gray value of the target object according to the infrared radiation of the target object acquired by a detector of the thermal infrared imager; and acquiring a temperature value of a preset component obtained by measurement, wherein the detector is arranged on the preset component.
Preferably, the judging module is further configured to generate an initial temperature according to a preset conversion rule of the temperature and the gray scale value and the target gray scale value; and determining the temperature of the target object according to a preset temperature compensation parameter corresponding to the distance between the thermal infrared imager and the target object and the initial temperature.
Preferably, the determining module is further configured to determine the temperature of the target object according to the ambient humidity where the thermal infrared imager is located, the corresponding preset temperature compensation parameter, and the initial temperature.
Example four
Corresponding to the above embodiments, as shown in fig. 5, the present application provides a thermal infrared imager, which includes a detector 510 for collecting infrared radiation of a target object; the presetting component 520 is provided with the detector; the temperature sensor 530 is used for acquiring the temperature value of the preset component; the processing device 540 is configured to determine an initial gray value of a target object according to infrared radiation of the target object acquired by a detector of the thermal infrared imager, where a difference between acquisition time of the infrared radiation and startup time of the thermal infrared imager is not greater than a preset time threshold;
acquiring a temperature value of the preset component acquired by the temperature sensor;
determining a gray value change coefficient corresponding to the temperature value according to a preset calculation rule;
determining a corresponding gray value adjustment value according to the gray value change coefficient and the temperature value;
generating a target gray value according to the gray value adjustment value and the initial gray value;
and determining the temperature of the target object according to a preset conversion rule of the temperature and the gray value and the target gray value.
Preferably, the preset member 520 includes a flange, and the detector is disposed on an outer surface of the flange or embedded in the flange.
Preferably, the thermal infrared imager further comprises a lens 750, and the lens 750 is used for converging the infrared radiation emitted by the target object to the detector.
Preferably, the processing device 540 is further configured to generate an initial temperature according to a preset conversion rule between the temperature and the gray scale value and the target gray scale value; and determining the temperature of the target object according to a preset temperature compensation parameter corresponding to the distance between the thermal infrared imager and the target object and the initial temperature.
Preferably, the processing device 540 may be further configured to determine the temperature of the target object according to the ambient humidity where the thermal infrared imager is located, the corresponding preset temperature compensation parameter, and the initial temperature.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for calibrating a thermal infrared imager, the method comprising:
acquiring an initial gray value of a target object acquired by a thermal infrared imager, wherein the difference between the acquisition time of the initial gray value and the starting-up time of the thermal infrared imager is not more than a preset time threshold;
acquiring a measured temperature value of the thermal infrared imager;
determining a gray value adjustment value corresponding to the temperature value according to a preset calculation rule;
generating a target gray value according to the gray value adjustment value and the initial gray value;
and determining the temperature of the target object according to a preset conversion rule of the temperature and the gray value and the target gray value.
2. The method of claim 1, wherein the obtaining initial gray scale values of the target object collected by the thermal infrared imager comprises:
determining an initial gray value of a target object according to infrared radiation of the target object acquired by a detector of a thermal infrared imager;
the acquiring of the measured temperature value of the thermal infrared imager comprises:
and acquiring a measured temperature value of a preset component, wherein the detector is arranged on the preset component.
3. The method according to claim 1 or 2, wherein the determining the temperature of the target object according to the preset conversion rule of the temperature and the gray scale value and the target gray scale value comprises:
generating an initial temperature according to a preset conversion rule of the temperature and the gray value and the target gray value;
and determining the temperature of the target object according to a preset temperature compensation parameter corresponding to the distance between the thermal infrared imager and the target object and the initial temperature.
4. The method of claim 3, wherein the determining the temperature of the target object according to the initial temperature and a preset temperature compensation parameter corresponding to the distance between the thermal infrared imager and the target object comprises:
and determining the temperature of the target object according to the ambient humidity of the thermal infrared imager, the corresponding preset temperature compensation parameter and the initial temperature.
5. Method according to claim 1 or 2, characterized in that said preset time threshold is 30 minutes.
6. A correction device for a thermal infrared imager, the device comprising:
the system comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring an initial gray value of a target object acquired by a thermal infrared imager, and the difference value between the acquisition time of the initial gray value and the starting-up time of the thermal infrared imager is not more than a preset time threshold; acquiring a measured temperature value of the thermal infrared imager;
the calculation module is used for determining a gray value change coefficient corresponding to the temperature value according to a preset calculation rule; determining a corresponding gray value adjustment value according to the gray value change coefficient and the temperature value; generating a target gray value according to the gray value adjustment value and the initial gray value;
and the judgment module is used for determining the temperature of the target object according to a preset conversion rule of the temperature and the gray value and the target gray value.
7. A thermal infrared imager, comprising:
the detector is used for collecting infrared radiation of a target object;
the detector is arranged on the presetting component;
the temperature sensor is used for acquiring the temperature value of the preset component;
the processing device is used for determining an initial gray value of a target object according to infrared radiation of the target object acquired by a detector of the thermal infrared imager, and the difference value between the acquisition time of the infrared radiation and the starting-up time of the thermal infrared imager is not more than a preset time threshold;
acquiring a temperature value of the preset component acquired by the temperature sensor;
determining a gray value change coefficient corresponding to the temperature value according to a preset calculation rule;
determining a corresponding gray value adjustment value according to the gray value change coefficient and the temperature value;
generating a target gray value according to the gray value adjustment value and the initial gray value;
and determining the temperature of the target object according to a preset conversion rule of the temperature and the gray value and the target gray value.
8. The thermal infrared imager of claim 7, wherein the predetermined component includes a flange, and the detector is disposed on an outer surface of the flange or embedded within the flange.
9. The thermal infrared imager of claim 7 or 8, further comprising a lens for focusing infrared radiation emitted by the target object to the detector.
10. The thermal infrared imager of claim 7 or 8, wherein the processing device is further configured to generate an initial temperature according to a preset conversion rule of temperature and gray value and the target gray value; and determining the temperature of the target object according to a preset temperature compensation parameter corresponding to the distance between the thermal infrared imager and the target object and the initial temperature.
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