CN113916385A - Surface source blackbody emissivity calibration method based on multiple reflection method - Google Patents
Surface source blackbody emissivity calibration method based on multiple reflection method Download PDFInfo
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- CN113916385A CN113916385A CN202111181358.5A CN202111181358A CN113916385A CN 113916385 A CN113916385 A CN 113916385A CN 202111181358 A CN202111181358 A CN 202111181358A CN 113916385 A CN113916385 A CN 113916385A
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Abstract
The invention provides a method for calibrating surface source blackbody emissivity based on a multiple reflection method, and belongs to the technical field of intelligent calibration. Specifically, the method comprises the following steps of constructing a surface source black body reflection model according to the actual structure of the surface source black body, wherein the specific construction method comprises the following steps: firstly, a light path tracing model is constructed, then grooves are added on the basis of the light path tracing model, and the emissivity of the surface source black body is improved through the cavity effect generated by the grooves; then calculating the theoretical emissivity of the surface source black body through a multiple reflection theory, wherein the specific calculation method comprises the following steps: and emitting light beams to the reflecting surface of the surface source black body according to the multiple reflection theory, tracing each light beam, counting the reflection times of the reflected light beams, and calculating the theoretical emissivity of the surface source black body. The method solves the technical problems of high requirement on the number of samples and long evaluation period of the existing blackbody emissivity calibration, shortens the calculation time of the local emissivity, reduces the dependence on the number of samples and improves the emissivity evaluation precision.
Description
Technical Field
The application relates to a calibration method of emissivity, in particular to a calibration method of emissivity of a surface source black body based on a multiple reflection method, and belongs to the technical field of intelligent calibration.
Background
The blackbody is an ideal object, and in practical application, a blackbody radiation source is used as a reference device for calibrating instruments such as infrared temperature measurement and infrared imaging. An ideal black body has both an emissivity and an absorptivity of 1, i.e., it can absorb all wavelengths of radiation at any temperature and can emit radiation to the maximum. In reality there is no ideal black body. The radiation of a small hole opened in a closed cavity, called a hohlraum, can be regarded as hohlraum radiation, so that the emissivity is close to 1. With the rapid development of infrared technology in recent years, higher requirements are put forward on the aspects of calibration precision, resolution and the like of surface source infrared detection equipment, and the traditional cavity type black body cannot meet the requirements of technical development. In the middle and far infrared wave bands, the functions and requirements are realized by mainly utilizing a surface source black body. Therefore, designing and developing a surface source black body is particularly important for the continuous and rapid development of infrared technology. At present, the theoretical calculation of the emissivity of the surface source black body still needs to be further improved, and in the aspect of experimental verification, a new technical means is also needed to verify a theoretical result, so that more technical means are provided for realizing the design and the test of the surface source black body, and the provision of the surface source black body as a calibration instrument for an infrared large-caliber testing device is a main application background.
At present, a method for evaluating emissivity of a concentric V-shaped groove surface source blackbody radiation model based on a Monte-Carlo method is generally established, and due to the fact that the method belongs to a random method, the requirement on the number of samples is high, and the evaluation period is long.
Therefore, the invention provides a calibration method for the surface source blackbody emissivity based on a multiple reflection method, which realizes the solving of a model and the improvement of the precision by searching an objective function and an optimization method and is used for the calibration of the temperature of a passive temperature zone of a thermometer.
Disclosure of Invention
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
In view of the above, the present invention provides a method for calibrating surface source blackbody emissivity based on a multiple reflection method, which comprises the following steps:
step one, constructing a surface source blackbody reflection model according to the actual structure of the surface source blackbody, wherein the specific construction method comprises the following steps: firstly, a light path tracing model is constructed, then grooves are added on the basis of the light path tracing model, and the emissivity of the surface source black body is improved through the cavity effect generated by the grooves;
step two, calculating the theoretical emissivity of the surface source black body through a multiple reflection theory, wherein the specific calculation method comprises the following steps: and emitting light beams to the reflecting surface of the surface source black body according to the multiple reflection theory, tracing each light beam, counting the reflection times of the reflected light beams, and calculating the theoretical emissivity of the surface source black body.
Preferably, the groove is a conical groove, a V-shaped groove or a quadrangular pyramid groove.
Preferably, the theoretical emissivity of the surface source black body changes according to the change of the groove height and the included angle in the step one.
Preferably, the multiple reflection theory divides the inner wall of the cavity into an infinite number of micro-surface elements, and the directional radiation intensity of each micro-surface element is composed of the directional radiation intensity of the micro-surface element itself and the directional radiation intensity reflected to the micro-surface element by other micro-surface elements.
Preferably, the specific method for calculating the theoretical emissivity is obtained by the following formula:
the absorption of the hohlraum when only one reflection is considered:
wherein alpha isaThe absorption rate of the blackbody cavity, l is the radius of the cavity, rho is the surface reflectivity of the inner wall of the blackbody cavity, and D0Is an opening of the blackbody cavity;
because the condition of only once reflection can not appear in actual conditions, still have the residual energy and continue to reflect at the cavity inner wall, can obtain the energy that overflows from the opening part through the secondary reflection in the same way:
the energy of the light beam overflowing from the opening is composed of two parts, one part is the energy carried by the light beam directly escaping through one-time reflection, and the other part is the energy epsilon escaping from the opening through multiple reflectionso：
Thus, the energy e escaping from the opening can be subtracted from the total energy of the incoming beamoObtaining the emissivity of the blackbody cavity:
the invention has the following beneficial effects: the method disclosed by the invention is based on the calibration of the surface source blackbody emissivity by a multiple reflection method, so that the calculation time of the local emissivity is shortened, the dependence on the number of samples is reduced, and the emissivity evaluation precision is improved. The technical problems that the existing blackbody emissivity calibration has high requirements on the number of samples and the evaluation period is long are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a surface source blackbody cavity according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Embodiment 1, referring to fig. 1 to fig. 2, illustrates this embodiment, and the method for calibrating the surface source blackbody emissivity based on the multiple reflection method in this embodiment includes the following steps:
step one, constructing a surface source blackbody reflection model according to the actual structure of the surface source blackbody, wherein the specific construction method comprises the following steps: firstly, a light path tracing model is constructed, then grooves are added on the basis of the light path tracing model, and the emissivity of the surface source black body is improved through the cavity effect generated by the grooves;
specifically, the groove is a conical groove, a V-shaped groove or a quadrangular pyramid groove.
Step two, calculating the theoretical emissivity of the surface source black body through a multiple reflection theory, wherein the specific calculation method comprises the following steps: and emitting light beams to the reflecting surface of the surface source black body according to the multiple reflection theory, tracing each light beam, counting the reflection times of the reflected light beams, and calculating the theoretical emissivity of the surface source black body.
Specifically, the theoretical emissivity of the surface source black body changes according to the change of the height of the groove and the angle of the included angle in the step one.
The multiple reflection theory divides the inner wall of the cavity into an infinite number of micro-surface elements, and the directional radiation intensity of each micro-surface element is composed of the directional radiation intensity of the micro-surface element and the directional radiation intensity reflected to the micro-surface element by other micro-surface elements.
Referring to FIG. 2, assume that there is a beam of light from the blackbody cavity opening D0The light ray is vertically incident, and a part of the residual light ray absorbed by the bottom micro-surface element A is reflected to the inner surface S of the cavity and a part of the residual light ray is reflected from the opening D0Escape, so that the inner surface S of the spherical cavity and the opening D can be considered0The ratio of the area multiplied by the reflectivity p is equal to the ratio of the total beam energy to the energy of the escaping beam.
The absorption of the hohlraum when only one reflection is considered:
wherein alpha isaThe absorption rate of the blackbody cavity, l is the radius of the cavity, rho is the surface reflectivity of the inner wall of the blackbody cavity, and D0Is an opening of the blackbody cavity;
because the condition of only once reflection can not appear in actual conditions, still have the residual energy and continue to reflect at the cavity inner wall, can obtain the energy that overflows from the opening part through the secondary reflection in the same way:
the energy of the light beam overflowing from the opening is composed of two parts, one part is the energy carried by the light beam directly escaping through one-time reflection, and the other part is the energy epsilon escaping from the opening through multiple reflectionso：
Thus, the energy e escaping from the opening can be subtracted from the total energy of the incoming beamoObtaining the emissivity of the blackbody cavity:
the emissivity can be calculated by substituting the parameters and the energy of the intensity of the light reflected by the black body into the formula.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.
Claims (5)
1. A method for calibrating surface source blackbody emissivity based on a multiple reflection method is characterized by comprising the following steps:
step one, constructing a surface source blackbody reflection model according to the actual structure of the surface source blackbody, wherein the specific construction method comprises the following steps: firstly, a light path tracing model is constructed, then grooves are added on the basis of the light path tracing model, and the emissivity of the surface source black body is improved through the cavity effect generated by the grooves;
step two, calculating the theoretical emissivity of the surface source black body through a multiple reflection theory, wherein the specific calculation method comprises the following steps: and emitting light beams to the reflecting surface of the surface source black body according to the multiple reflection theory, tracing each light beam, counting the reflection times of the reflected light beams, and calculating the theoretical emissivity of the surface source black body.
2. The calibration method according to claim 1, wherein the groove is a conical groove, a V-shaped groove or a quadrangular pyramid groove.
3. The calibration method according to claim 2, wherein the theoretical emissivity of the surface source black body varies according to the groove height and the angle of the included angle in the step one.
4. The calibration method according to claim 3, wherein the multiple reflection theory divides the inner wall of the cavity into an infinite number of micro-surface elements, and the directional radiation intensity of each micro-surface element is composed of the directional radiation intensity of the micro-surface element itself and the directional radiation intensity of the micro-surface element reflected to the micro-surface element by other micro-surface elements.
5. The calibration method according to claim 4, wherein the specific method for calculating the theoretical emissivity is obtained by the following formula:
the absorption of the hohlraum when only one reflection is considered:
wherein alpha isaThe absorption rate of the blackbody cavity, l is the radius of the cavity, rho is the surface reflectivity of the inner wall of the blackbody cavity, and D0Is an opening of the blackbody cavity;
because the condition of only once reflection can not appear in actual conditions, still have the residual energy and continue to reflect at the cavity inner wall, can obtain the energy that overflows from the opening part through the secondary reflection in the same way:
the energy of the light beam overflowing from the opening is composed of two parts, one part is the energy carried by the light beam directly escaping through one-time reflection, and the other part is the energy epsilon escaping from the opening through multiple reflections0：
Thus, the energy escaping from the opening can be subtracted from the total energy of the incident beamEnergy epsilonoObtaining the emissivity of the blackbody cavity:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115265825A (en) * | 2022-07-06 | 2022-11-01 | 东北大学 | Inner surface temperature measuring method and device, storage medium and terminal |
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| CN106503425A (en) * | 2016-10-10 | 2017-03-15 | 北京信息科技大学 | A kind of method for calculating dependent radiance transfer factor |
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| CN104237133A (en) * | 2014-09-10 | 2014-12-24 | 北京环境特性研究所 | Determination method and determination device of normal emittance of pointed cone array plane black body |
| CN106503425A (en) * | 2016-10-10 | 2017-03-15 | 北京信息科技大学 | A kind of method for calculating dependent radiance transfer factor |
| CN112964371A (en) * | 2021-02-04 | 2021-06-15 | 东华理工大学 | Steel ladle infrared temperature measurement method for effective emissivity correction based on Monte Carlo model |
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| CN115265825A (en) * | 2022-07-06 | 2022-11-01 | 东北大学 | Inner surface temperature measuring method and device, storage medium and terminal |
| CN115265825B (en) * | 2022-07-06 | 2024-04-16 | 东北大学 | Method and device for measuring temperature of inner surface, storage medium and terminal |
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