Infrared radiation temperature measurement humidity attenuation compensation method

Abstract

The present application relates to the field of infrared temperature measurement, more particularly to a temperature and humidity attenuation compensation method in infrared radiation temperature measurement, comprising: obtaining the temperature of a target object based on an infrared temperature measurement device, establishing a functional relationship between the spectral radiance, a given wavelength range and the target measured temperature, and calculating the spectral radiance corresponding to the target measured temperature and the ambient temperature respectively; also establishing a functional relationship between the water vapor absorption transmittance and the ambient temperature and humidity, and obtaining the water vapor absorption transmittance under different ambient temperatures and different ambient humidities; also deriving a correction formula of the target infrared radiation after attenuation by the ambient temperature and humidity based on the Kirchhoff's law of thermal radiation, and correcting the measured spectral radiance of the target object; finally inversely solving the real temperature of the target object. The present application can solve the problem of inaccurate infrared temperature measurement caused by inconsistent infrared radiation attenuation rules under different ambient temperature and humidity.

Description

Technical Field

[0001] This invention relates to the field of infrared thermometry, and more specifically to a method for compensating for temperature and humidity attenuation in infrared radiation thermometry. Background Technology

[0002] In high-humidity environments, the absorption of infrared radiation by water molecules can lead to inaccurate readings from infrared thermometers. Existing technologies compensate for this by detecting fixed targets under varying humidity levels, collecting data, and establishing a fitting equation. However, this method only addresses the inaccuracy of a given infrared thermometer under different environmental humidity conditions—a single factor. It doesn't consider the combined effects of ambient temperature and humidity, nor does it delve into the fundamental theory of infrared radiation to analyze its attenuation under different temperature and humidity environments. This results in a lack of universality in practical applications and the presence of inherent errors in measurement results under varying ambient temperatures. Summary of the Invention

[0003] To better address the above problems, this invention provides a method for compensating for temperature and humidity attenuation in infrared radiation thermometry, which is implemented by performing the following steps:

[0004] Step S1: Obtain the temperature of the target object based on the infrared thermometer and use it as the target measured temperature. Establish a functional relationship between the spectral radiance and the given wavelength range and the target measured temperature. Calculate the spectral radiance corresponding to the target measured temperature and the ambient temperature.

[0005] Step S2: Establish the functional relationship between water vapor absorption transmittance and the ambient temperature and humidity, and obtain the water vapor absorption transmittance under different ambient temperatures and different ambient humidity.

[0006] Step S3: Based on the spectral radiance corresponding to the measured temperature of the target, the spectral radiance corresponding to the ambient temperature, and the water vapor absorption and transmittance under different ambient temperatures and humidity, the measured spectral radiance of the target object is corrected, the measured spectral radiance of the target after temperature and humidity attenuation compensation is calculated, and the true spectral radiance of the target object is obtained.

[0007] Step S4: Based on the true spectral radiance of the target object and the formula for calculating the spectral radiance, the true temperature of the target object is obtained by inverse solving, thereby realizing temperature and humidity attenuation compensation in infrared radiation thermometry.

[0008] As a preferred embodiment of the present invention, step S1, before establishing the functional relationship between spectral radiance, a given wavelength range, and the target measured temperature, includes:

[0009] Prepare the target object to be tested, use the infrared temperature measuring device to obtain the measured temperature of the target object, define the temperature range that the infrared temperature measuring device can detect as a first temperature to a second temperature, and define the wavelength band [λ1, λ2] that the infrared temperature measuring device detector can receive as a first value to a second value.

[0010] As a preferred embodiment of the present invention, step S1, establishing the functional relationship between spectral radiance, a given wavelength range, and the target measured temperature, includes:

[0011] Formula 1 expresses the spectral radiance of the target object at a fixed wavelength λ at a temperature of T:

[0012]

[0013] Where C1 represents Planck's first constant, C2 represents Planck's second constant, T represents the temperature of the target object, λ represents the fixed wavelength of the spectral band, M(λ,T) represents the spectral radiance of the target object at temperature T at a fixed wavelength λ, and the target object represents the calibrated standard source.

[0014] As a preferred embodiment of the present invention, the functional relationship between spectral radiance, a given wavelength range, and the measured target temperature further includes:

[0015] The spectral radiance of the target object at temperature T within the light wave range [λ1, λ2] that the detector of the infrared thermometer can receive is expressed as a definite integral using Formula 2:

[0016]

[0017] The definite integral band [λ1,λ2] is consistent with the spectral band that the infrared thermometer detector can receive.

[0018] As a preferred embodiment of the present invention, a functional relationship between water vapor absorption transmittance and the ambient temperature and humidity is established, and the water vapor absorption transmittance under different ambient temperatures and humidity levels is obtained, including:

[0019] The transmittance function of water vapor infrared spectrum is expressed by Formula 3:

[0020]

[0021] Where τ(λ) represents the infrared transmittance of the water vapor, and ω represents the relative humidity. The content of water vapor in saturated air is related to the ambient temperature and can be obtained by referring to the table of air temperature and saturated water vapor content. μ(λ) represents the infrared absorption attenuation coefficient of water vapor, which is only related to the fixed wavelength λ of the spectral band.

[0022] As a preferred embodiment of the present invention, the water vapor infrared spectral absorption attenuation coefficient can also be expressed as a mean value:

[0023] Under constant ambient temperature and ambient temperature, if the absorption attenuation coefficient and transmittance of the water vapor infrared spectrum in a given band are set to be constants, then the absorption attenuation coefficient of the water vapor infrared spectrum, expressed as the average value of the given band, is given by Formula 4:

[0024]

[0025] in, This represents the absorption attenuation coefficient of water vapor in the infrared spectrum within a given wavelength [λ1, λ2], and is a constant.

[0026] As a preferred embodiment of the present invention, when the infrared absorption attenuation coefficient of water vapor within a given wavelength [λ1, λ2] is a constant, the invention further includes:

[0027] After obtaining the measured temperature values ​​of the target under different ambient temperatures and humidity using an infrared thermometer, regression analysis can be performed to obtain the infrared spectral absorption attenuation coefficient of water vapor in the first to second value bands. Therefore, the water vapor absorption transmittance within the receiver band [λ1, λ2] of the infrared thermometer can be expressed as:

[0028]

[0029] in, This indicates the absorption and transmission rate of the water vapor.

[0030] As a preferred embodiment of the present invention, the formula for calculating the spectral radiance corresponding to the target measured temperature is as follows:

[0031] After the infrared radiation from the target is attenuated by the ambient temperature and humidity, the spectral radiation corresponding to the measured temperature of the target received by the infrared thermometer is expressed by Formula 6:

[0032]

[0033] Among them, T * W(T) represents the actual measured temperature of the target received by the infrared temperature measuring device. * The infrared temperature measuring device receives the actual measured temperature T of the target. *The corresponding spectral radiance, W(T) represents the spectral radiance corresponding to the measured temperature T of the target object, T0 represents the ambient temperature, and W(T0) represents the spectral radiance corresponding to the ambient temperature. The term "absorption rate of water vapor" refers to the emissivity of the water vapor, and "target infrared radiation" refers to the infrared radiation emitted by the target object.

[0034] As a preferred embodiment of the present invention, a correction formula is derived for the target infrared radiation after attenuation due to ambient temperature and humidity:

[0035] The sum of the object's emissivity (or absorptivity) ε, reflectivity ρ, and transmittance τ is constant at 1. Therefore, formula 8 is derived to correct the infrared radiation of the target after attenuation due to ambient temperature and humidity:

[0036]

[0037] Where T1 represents the temperature before compensation, that is, the temperature measured by the infrared thermometer after the target radiation has been attenuated by temperature and humidity; T2 represents the temperature after compensation, that is, the original true temperature of the target object.

[0038] As a preferred embodiment of the present invention, the inverse kinematics method for determining the true temperature of the target object includes:

[0039] Substitute the measured spectral radiance of the target after temperature and humidity attenuation compensation into the spectral radiance calculation formula to obtain the true temperature of the target object.

[0040] Compared with the prior art, the beneficial effects of the present invention are at least as follows:

[0041] 1. The technical solution of the present invention obtains the temperature of the target object based on an infrared thermometer in the spectral radiation acquisition module, establishes a functional relationship between the spectral radiation and a given wavelength range and the measured temperature of the target, and calculates the spectral radiation corresponding to the measured temperature of the target and the ambient temperature respectively, so as to compare the difference in spectral radiation between the target object and the environment in the same wavelength range, and provides a basis for temperature and humidity attenuation correction. In the water vapor absorption transmittance function acquisition module, a functional relationship between water vapor absorption transmittance and ambient temperature and humidity is established, and the water vapor absorption transmittance under different ambient temperatures and humidity levels is obtained, as well as the influence of ambient temperature on the water vapor absorption transmittance under different humidity levels. In the spectral radiance temperature and humidity attenuation correction module, a correction formula for the target infrared radiation after attenuation by ambient temperature and humidity is derived based on Kirchhoff's thermal radiation law. Based on the spectral radiance corresponding to the target's measured temperature, the spectral radiance corresponding to the ambient temperature, and the water vapor absorption transmittance under different ambient temperatures and humidity levels, the measured spectral radiance of the target object is corrected, the corrected measured spectral radiance of the target is calculated, and the true spectral radiance of the target object is obtained. In the spectral radiance inverse temperature calculation module, the true temperature of the target object is calculated by inverse solving based on the true spectral radiance of the target object and the spectral radiance calculation formula. This invention takes into account the combined effect of ambient temperature and humidity on infrared radiation attenuation, which makes the method still have good stability when applied to complex real environments. On the other hand, it does not depend on a specific infrared temperature measuring device and has universality in the field of infrared radiation temperature measurement.

[0042] 2. The technical solution of this invention studies the theory of infrared spectral radiation and establishes a quantitative mapping relationship between environmental temperature and humidity, infrared radiation, and temperature measurement results by means of theoretical modeling and data simulation. This can solve the problem of inaccurate infrared temperature measurement caused by inconsistent infrared radiation attenuation patterns under different environmental temperatures and humidity. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0044] Figure 1 This is a flowchart of the steps in a method for compensating for temperature and humidity attenuation in infrared radiation thermometry according to the present invention.

[0045] Figure 2 This is a graph showing the relationship between water vapor absorption transmittance and ambient temperature under different humidity conditions in this invention. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0047] It is understood that the terms "first," "second," etc., used in this application may be used herein to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first script may be referred to as a second script, and similarly, a second script may be referred to as a first script.

[0048] Existing technologies in the field of infrared temperature measurement can only solve the problem of inaccurate temperature measurement under the single factor variable of different ambient humidity for a given infrared temperature measurement device. They do not take into account the combined effect of ambient temperature and humidity, nor do they start from the fundamental theory of infrared radiation to deeply analyze the attenuation law of infrared radiation under different temperature and humidity environments. As a result, the technology is not universal in practical applications, and the measurement results still have certain errors under different ambient temperatures.

[0049] To address the aforementioned technical problems, the present invention proposes the following... Figure 1 The method for compensating for temperature and humidity attenuation in infrared radiation thermometry, as shown, includes the following steps:

[0050] Step S1: Obtain the temperature of the target object based on the infrared thermometer and use it as the target measured temperature. Establish the functional relationship between the spectral radiance and the given wavelength range and the target measured temperature. Calculate the spectral radiance corresponding to the target measured temperature and the ambient temperature.

[0051] Specifically, the detectable temperature range and receiveable wavelength bands [λ1, λ2] of the infrared thermometer are determined, and the target object is also identified. The target object is typically a blackbody radiator, but it can also be other isothermal objects. The infrared thermometer is used to measure the temperature of the target object by receiving its emitted infrared radiation, and the measured temperature value is recorded as the target's measured temperature. A functional relationship is established between the spectral radiance, the given wavelength range, and the target's measured temperature. Using this established functional relationship, the target's measured temperature is substituted into the formula to calculate the spectral radiance of the target object within the given wavelength range. Simultaneously, the ambient temperature is also substituted into the same formula to calculate the spectral radiance of the ambient temperature within the given wavelength range. This allows for comparison of the spectral radiance differences between the target object and the environment within the same wavelength range, providing a basis for temperature and humidity attenuation correction. The functional relationship between the spectral radiance, the given wavelength range, and the target's measured temperature will be described in detail below.

[0052] Step S2: Establish the functional relationship between water vapor absorption transmittance and ambient temperature and humidity, and obtain the water vapor absorption transmittance under different ambient temperatures and humidity levels.

[0053] Specifically, based on the Lambert-Beer law, the transmittance function of the infrared spectrum of water vapor is derived. Under constant ambient temperature and humidity, the absorption attenuation coefficient and transmittance of the infrared radiation in a given wavelength band of water vapor can be considered constants. Therefore, the water vapor absorption attenuation coefficient can be replaced by the mean value of the given wavelength band. Since the water vapor infrared spectral absorption attenuation coefficient is within a given wavelength [λ1, λ2]... Since it is a constant, after obtaining the measured temperature values ​​of the target under different ambient temperatures and humidity using an infrared thermometer, the infrared spectral absorption attenuation coefficient of water vapor in the 8-14µm band can be obtained through regression analysis. For a, such as Figure 2 This demonstrates how water vapor absorption transmittance is affected by ambient temperature under different humidity levels.

[0054] Step S3: Based on the spectral radiance corresponding to the target measured temperature, the spectral radiance corresponding to the ambient temperature, and the water vapor absorption and transmittance under different ambient temperatures and humidity, correct the measured spectral radiance of the target object, calculate the measured spectral radiance of the target after temperature and humidity attenuation compensation, and obtain the true spectral radiance of the target object.

[0055] Step S4: Based on the true spectral radiance of the target object and the formula for calculating spectral radiance, the true temperature of the target object is obtained by inverse solving, thereby realizing temperature and humidity attenuation compensation in infrared radiation thermometry.

[0056] Specifically, for blackbody targets with actual temperatures of 30℃, 100℃, 350℃, and 600℃, different temperature and humidity environments were set up to verify the accuracy of this method. The measured temperatures before compensation and the corrected temperatures after compensation are shown in Tables 1, 2, and 3. It can be observed that the corrected temperatures after compensation are closer to the actual temperature of the blackbody target. In this example, the blackbody target is used as the target object, where the blackbody target is a blackbody radiometer, but it can also be other isothermal objects. The different temperature and humidity environments were set up using a walk-in constant temperature and humidity test chamber.

[0057] Table 1

[0058]

[0059] Table 2

[0060]

[0061] Table 3

[0062]

[0063]

[0064] Through the coordination of the above steps, the present invention still has good stability when applied to complex real-world environments; in addition, the present invention does not depend on a specific infrared temperature measuring device and has universal applicability in the field of infrared radiation temperature measurement.

[0065] Furthermore, in step S1 above, before establishing the functional relationship between spectral radiance and the given wavelength range and the target measured temperature, the following is included:

[0066] Prepare the target object to be tested, use an infrared thermometer to obtain the actual temperature of the target object, define the temperature range that the infrared thermometer can detect as the first temperature to the second temperature, and define the wavelength range that the infrared thermometer detector can receive as the first value to the second value [λ1, λ2].

[0067] Specifically, the infrared temperature measuring device can detect temperatures ranging from -20℃ to 650℃, and the infrared temperature measuring device detector can receive wavelengths [λ1, λ2] of 8 to 14 μm. The target object can be a blackbody radiator or other constant-temperature objects.

[0068] Furthermore, in step S1 above, establishing the functional relationship between spectral radiance and the given wavelength range and the target measured temperature includes:

[0069] Based on Planck's blackbody radiation formula, Equation 1 expresses the spectral radiance of a target object at temperature T at a fixed wavelength λ:

[0070]

[0071] Where C1 represents Planck's first constant, C2 represents Planck's second constant, T represents the temperature of the target object, λ represents the fixed wavelength of the spectral band, M(λ,T) represents the spectral radiance of the target object at temperature T at a fixed wavelength λ, and the target object represents the calibration standard source.

[0072] Furthermore, the functional relationship between spectral radiance and a given wavelength range and the measured target temperature also includes:

[0073] Based on Planck's blackbody radiation formula, Equation 2 expresses the spectral radiation of a target object at temperature T within the light wave range [λ1, λ2] that the detector of an infrared thermometer can receive in the form of a definite integral:

[0074]

[0075] Among them, the definite integral band [λ1,λ2] is consistent with the spectral band that the infrared thermometer detector can receive.

[0076] Furthermore, a functional relationship between water vapor absorption transmittance and ambient temperature and humidity was established, and water vapor absorption transmittance under different ambient temperatures and humidity levels was obtained, including:

[0077] Based on the Lambert-Beer law, the transmittance function of the infrared spectrum of water vapor is expressed by Equation 3:

[0078]

[0079] Where τ(λ) represents the infrared transmittance of water vapor, and ω represents the relative humidity. The value represents the water vapor content in saturated air, which is related to the ambient temperature and can be obtained by referring to the table of air temperature and saturated water vapor content. μ(λ) represents the absorption attenuation coefficient of water vapor in the infrared spectrum, which is only related to the fixed wavelength λ of the spectral band.

[0080] Furthermore, the absorption attenuation coefficient of water vapor in the infrared spectrum can also be expressed as the mean value:

[0081] Under constant ambient temperature and humidity, if the absorption attenuation coefficient and transmittance of water vapor infrared spectrum in a given band are set to be constants, then the absorption attenuation coefficient of water vapor infrared spectrum, expressed as the mean value of the given band, is given by Formula 4:

[0082]

[0083] in, This represents the absorption attenuation coefficient of water vapor in the infrared spectrum within a given wavelength [λ1, λ2], and is a constant.

[0084] Furthermore, when the absorption attenuation coefficient of water vapor in the infrared spectrum within a given wavelength [λ1, λ2] is a constant, it also includes:

[0085] After obtaining the measured temperature values ​​of the target under different ambient temperatures and humidity using an infrared thermometer, regression analysis can be performed to obtain the infrared spectral absorption attenuation coefficient of water vapor in the first to second value bands. Therefore, the water vapor absorption transmittance within the receiver band [λ1, λ2] of the infrared thermometer can be expressed as:

[0086]

[0087] in, This indicates the absorption and transmission rate of water vapor.

[0088] Specifically, due to the absorption attenuation coefficient of water vapor in the infrared spectrum within a given wavelength [λ1, λ2] Since it is a constant, after obtaining the measured temperature values ​​of the target under different ambient temperatures and humidity using an infrared thermometer, the infrared spectral absorption attenuation coefficient of water vapor in the 8-14µm band can be obtained through regression analysis. Therefore, the water vapor absorption transmittance within the receiver band [λ1, λ2] of the infrared thermometer can be expressed by formula 5, such as... Figure 2 This demonstrates how water vapor absorption transmittance is affected by ambient temperature under different humidity levels.

[0089] Furthermore, the formula for calculating the spectral radiance corresponding to the measured target temperature is as follows:

[0090] Based on the law of conservation of energy, after the infrared radiation from the target has been attenuated by ambient temperature and humidity, the spectral radiation corresponding to the measured temperature of the target received by the infrared thermometer is expressed by Formula 6:

[0091]

[0092] Among them, T * W(T) represents the actual measured temperature of the target received by the infrared thermometer. * () indicates the actual measured temperature T of the target received by the infrared thermometer. * The corresponding spectral radiance, W(T) represents the spectral radiance corresponding to the measured temperature T of the target object, T0 represents the ambient temperature, and W(T0) represents the spectral radiance corresponding to the ambient temperature. This indicates the emissivity of water vapor, while target infrared radiation refers to the infrared radiation emitted by the target object.

[0093] Specifically, since the direct reflection effect of water vapor in the atmosphere is relatively small and can be ignored, it can be assumed that water vapor only absorbs and re-radiates the radiation from the environment and the radiation transmitted through the target object. The spectral radiance corresponding to the measured temperature of the target can then be obtained using the aforementioned law of conservation of energy.

[0094] Furthermore, the correction formula for the target's infrared radiation after attenuation due to ambient temperature and humidity is as follows:

[0095] According to Kirchhoff's law of thermal radiation, the sum of an object's emissivity (or absorptivity) ε, reflectivity ρ, and transmittance τ is constant at 1, as expressed in Formula 7:

[0096] ε+ρ+τ=1 (Formula 7)

[0097] Since the direct reflection effect of water vapor in the atmosphere is relatively small, the reflectivity ρ can be ignored. Substituting Equation 7 into Equation 6, we can obtain Equation 8, which corrects the infrared radiation of the target after attenuation due to ambient temperature and humidity:

[0098]

[0099] Where T1 represents the temperature before compensation, that is, the temperature measured by the infrared thermometer after the target radiation is attenuated by temperature and humidity; T2 represents the temperature after compensation, that is, the original true temperature of the target object.

[0100] Furthermore, the inverse kinematics method yields the true temperature of the target object, including:

[0101] Substitute the measured spectral radiance of the target after temperature and humidity attenuation compensation into the spectral radiance calculation formula to obtain the true temperature of the target object.

[0102] In summary, this invention obtains the temperature of the target object based on an infrared thermometer in the spectral radiance acquisition module, establishes a functional relationship between spectral radiance and a given wavelength range and the measured temperature of the target, and calculates the spectral radiance corresponding to the measured temperature of the target and the ambient temperature respectively, so as to compare the difference in spectral radiance between the target object and the environment in the same wavelength range, and provides a basis for temperature and humidity attenuation correction. In the water vapor absorption transmittance function acquisition module, a functional relationship between water vapor absorption transmittance and ambient temperature and humidity is established, and the water vapor absorption transmittance under different ambient temperatures and humidity levels is obtained, as well as the influence of ambient temperature on the water vapor absorption transmittance under different humidity levels. In the spectral radiance temperature and humidity attenuation correction module, a correction formula for the target infrared radiation after attenuation by ambient temperature and humidity is derived based on Kirchhoff's thermal radiation law. Based on the spectral radiance corresponding to the target's measured temperature, the spectral radiance corresponding to the ambient temperature, and the water vapor absorption transmittance under different ambient temperatures and humidity levels, the measured spectral radiance of the target object is corrected, the corrected measured spectral radiance of the target is calculated, and the true spectral radiance of the target object is obtained. In the spectral radiance inverse temperature calculation module, the true temperature of the target object is calculated by inverse solving based on the true spectral radiance of the target object and the spectral radiance calculation formula. This invention takes into account the combined effect of ambient temperature and humidity on infrared radiation attenuation, which makes the method still have good stability when applied to complex real environments. On the other hand, it does not depend on a specific infrared temperature measuring device and has universality in the field of infrared radiation temperature measurement.

[0103] It should be understood that although the steps in the flowcharts of the various embodiments of the present invention are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the various embodiments may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least a portion of the sub-steps or stages of other steps.

[0104] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

[0107] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for compensating for temperature and humidity attenuation in infrared radiation thermometry, characterized in that, The method includes: Step S1: Obtain the temperature of the target object based on the infrared thermometer and use it as the target measured temperature. Establish a functional relationship between the spectral radiance and the given wavelength range and the target measured temperature. Calculate the spectral radiance corresponding to the target measured temperature and the ambient temperature. Step S2: Establish the functional relationship between water vapor absorption transmittance and the ambient temperature and humidity, and obtain the water vapor absorption transmittance under different ambient temperatures and different ambient humidity. Step S3: Based on the spectral radiance corresponding to the measured temperature of the target, the spectral radiance corresponding to the ambient temperature, and the water vapor absorption and transmittance under different ambient temperatures and humidity, the measured spectral radiance of the target object is corrected, the measured spectral radiance of the target after temperature and humidity attenuation compensation is calculated, and the true spectral radiance of the target object is obtained. The formula for correcting the infrared radiation of a target after attenuation due to ambient temperature and humidity: the emissivity or absorptivity of the object. ε Reflectivity ρ and transmittance τ The sum is constant at 1, thus yielding formula 8 for the correction of the target infrared radiation after attenuation by ambient temperature and humidity: (Official 8); in, T 1 represents the temperature before compensation, that is, the temperature measured by the infrared thermometer after the target radiation has been attenuated by temperature and humidity. This represents the spectral radiance corresponding to the temperature before compensation. T 2 indicates the compensated temperature, which is the original true temperature of the target object. This represents the spectral radiance corresponding to the compensated temperature. Indicates ambient temperature. This represents the amount of spectral radiation corresponding to ambient temperature. This indicates the absorption and transmission rate of the water vapor; Step S4: Based on the true spectral radiance of the target object and the formula for calculating the spectral radiance, the true temperature of the target object is obtained by inverse solving, thereby realizing temperature and humidity attenuation compensation in infrared radiation thermometry.

2. The method according to claim 1, characterized in that, In step S1, before establishing the functional relationship between spectral radiance, a given wavelength range, and the target measured temperature, the following is included: Prepare the target object to be tested, and use the infrared temperature measuring device to obtain the measured temperature of the target object. Define the detectable temperature range of the infrared temperature measuring device as a first temperature to a second temperature. The detector of the infrared temperature measuring device can receive wavelengths of [band]. λ 1, λ 2] represents the first value to the second value.

3. The method according to claim 1, characterized in that, In step S1, establishing the functional relationship between spectral radiance, a given wavelength range, and the measured target temperature includes: Formula 1 expresses the effect of the target object at a certain fixed wavelength on a temperature T. The following spectral radiance: (Official 1); in, Denotes Planck's first constant. Let T represent Planck's second constant, and let T represent the temperature of the target object. Indicates a fixed wavelength in the spectral band. This indicates that the target object at temperature T is at a certain fixed wavelength. The target object represents a calibrated standard source, and the spectral radiance is measured below.

4. The method according to claim 3, characterized in that, The functional relationship between spectral radiance and a given wavelength range and the measured temperature of the target also includes: The spectral radiance of the target object at temperature T within the light wave range [λ1, λ2] that the detector of the infrared thermometer can receive is expressed as a definite integral using Formula 2: (Official 2); Among them, the definite integral band It is consistent with the spectral band that the detector of the infrared temperature measuring device can receive.

5. The method according to claim 2, characterized in that, Establish a functional relationship between water vapor absorption transmittance and ambient temperature and humidity, and obtain water vapor absorption transmittance under different ambient temperatures and humidity levels, including: The transmittance function of water vapor infrared spectrum is expressed by Formula 3: (Official 3); in, This indicates the infrared transmittance of the water vapor. Indicates relative humidity. This indicates the water vapor content in saturated air, which is related to the ambient temperature and can be obtained by referring to a table of air temperature and saturated water vapor content. The infrared absorption attenuation coefficient of the water vapor is related only to a fixed wavelength in the spectral band. related.

6. The method according to claim 5, characterized in that, The infrared absorption attenuation coefficient of water vapor can also be expressed as the mean value: Under constant ambient temperature and humidity, if the absorption attenuation coefficient and transmittance of water vapor infrared radiation in a given band are set to be constants, then the absorption attenuation coefficient of water vapor infrared radiation is expressed as the average value of the given band as Formula 4: (Official 4); in, Indicates at a given wavelength [ λ 1, λ 2] The absorption attenuation coefficient of internal water vapor in the infrared spectrum is a constant.

7. The method according to claim 6, characterized in that, At a given wavelength λ 1, λ 2] When the infrared absorption attenuation coefficient of internal water vapor is a constant, it also includes: After obtaining the measured temperature values ​​of the target under different ambient temperatures and humidity using an infrared thermometer, regression analysis can be performed to obtain the infrared spectral absorption attenuation coefficient of water vapor in the first to second value bands. for Therefore, the infrared thermometer detector can receive wavelengths in the [band]. λ 1, λ 2] The internal water vapor absorption and permeability can be expressed as: (Formula 5); in, This indicates the absorption and transmission rate of the water vapor.

8. The method according to claim 7, characterized in that, The formula for calculating the spectral radiance corresponding to the measured temperature of the target is: After the infrared radiation from the target is attenuated by the ambient temperature and humidity, the spectral radiation corresponding to the measured temperature of the target received by the infrared thermometer is expressed by Formula 6: (Official 6); in, This indicates the actual measured temperature of the target received by the infrared temperature measuring device. This indicates the actual measured temperature of the target received by the infrared temperature measuring device. The corresponding spectral radiance, This represents the spectral radiance corresponding to the actual temperature T of the target object. This indicates the ambient temperature. This represents the spectral radiation corresponding to the ambient temperature. The term "absorption rate of water vapor" refers to the emissivity of the water vapor, and "target infrared radiation" refers to the infrared radiation emitted by the target object.

9. The method according to claim 1, characterized in that, The inverse kinematics method is used to determine the true temperature of the target object, including: Substitute the measured spectral radiance of the target after temperature and humidity attenuation compensation into the spectral radiance calculation formula to obtain the true temperature of the target object.

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