CN109708853B - Integral transmittance determination method of infrared transmittance sheet - Google Patents
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Abstract
The invention discloses a method for determining integral transmittance of an infrared transmittance sheet. The integrated transmittance of the transmittance sheet is determined by using the transmittance sheet, the black body, the thermal imager and the light shielding plate device for detection, reading temperature values of the thermal imager at four moments by different methods, converting the temperature of each point displayed by the thermal imager in real time into a radiation emergent degree value, and determining the integrated transmittance of the transmittance sheet according to the radiation emergent degree value. The method has the advantages of accurate and simple measurement, rapid and accurate measurement of the transmittance, few optical elements in the light path, small external interference and simple and convenient measurement method.
Description
Technical Field
The invention relates to the field of optical target detection, in particular to a method for determining integral transmittance of an infrared transmittance sheet.
Background
Optical materials are widely used in modern military target detection equipment, and especially infrared optical materials in photoelectric weapon aiming and detection systems are widely applied, wherein infrared transmittance is the outstanding performance of the optical materials and can be used only by accurate calibration. The infrared transmittance sheet is used as a calibration device for testing the transmittance of other optical materials, and in the process from processing to production, certain errors exist between the transmittance and the factory calibration of the infrared transmittance sheet, or the transmittance is changed due to incomplete long-time storage of the infrared transmittance sheet, so that the experimental error is increased and unreliable if the infrared transmittance sheet is continuously used as a standard for other experimental tests. Therefore, the transmittance of the transmittance sheet can be accurately, effectively and conveniently calibrated.
The following 3 methods are generally used to measure the infrared transmittance:
a) detecting by using an infrared spectrophotometer;
b) detecting by using a plurality of related wave band laser transmitters and receivers;
c) and detecting by using a Fourier transform infrared spectrometer.
The method a is a system for measuring transmittance by using an infrared spectrophotometer, the precision of the method is related to the repeatability of the position of an optical comb in the system and the working state of an optical system and an electrical system, and the method is often not in the optimal working state due to the influence of working conditions and the like in the use process. Generally, most of the tests on the performance of the instrument are used for measuring the linearity and repeatability of transmittance, and the measurement on the precision is less. The single-light-path spectrophotometer transmittance measurement system has lower measurement accuracy, the double-light-path spectrophotometer transmittance measurement system has higher measurement accuracy of a measurement result than a single-light-path measurement method, but the light path is more complicated than a single-light-beam light path, optical elements are more in the light path, the reflection times and the transmission times of light are more, and the introduced measurement uncertainty is more.
In the method b, the transmittance measured by the laser is more suitable for the shielding capability test from visible light to 1.06 μm, because the spectrum between 0.4 and 1.06 μm is narrower, and the laser emitters between the two are more, the test is easier to realize, the shielding capability of 0.4 to 1.06 μm can be basically represented, and only 3.8 μm and 10.6 μm laser emitters exist between 3 to 5 μm and 8 to 14 μm, because the spectrum of the wave bands of 3 to 5 μm and 8 to 14 μm is very wide, the actual shielding capability of the infrared smoke screen is difficult to represent, and the infrared transmittance of the whole wave band is difficult to detect.
Among them, the method c is different in the state of various organic substances or inorganic substances themselves in natural environments. Solid materials are difficult to penetrate by infrared light, and many solid materials are difficult to detect by infrared spectroscopy. In some cases, in order to measure the infrared spectrum of a solid substance, the solid substance is heated, and then heated to a high temperature and a high pressure to change the solid substance into a gaseous state, and then the infrared spectrum of the solid substance is measured. This increases the complexity and cost of the detection device.
Disclosure of Invention
The invention aims to provide a method for determining integral transmittance of an infrared transmittance sheet, which can realize rapid and accurate measurement of transmittance.
In order to achieve the purpose, the invention provides the following scheme:
a method for determining integral transmittance of an infrared transmittance sheet is applied to an integral transmittance determination device of the infrared transmittance sheet, the device comprises a thermal imager, a transmission filter, a light shielding plate and a black body which are sequentially arranged, and the method comprises the following steps:
placing the thermal imager, the transmittance sheet, the light shielding plate and the black body in a dark room for constant temperature treatment;
covering a lens cover of the thermal imager, and reading a temperature value displayed by the thermal imager at the first moment;
opening a lens cover of the thermal imager, positioning the black body at a set distance right in front of the thermal imager, and reading a temperature value displayed by the thermal imager at a second moment;
covering the black body by using the light shielding plate, installing the transmittance sheet in front of the thermal imager lens, and reading a temperature value displayed by the thermal imager at a third moment;
removing the shading plate, keeping the transmittance sheet still, and reading a temperature value displayed by the thermal imager at a fourth moment;
determining a corresponding first-time blackbody radiation emergent degree value, a second-time blackbody radiation emergent degree value, a third-time blackbody radiation emergent degree value and a fourth-time blackbody radiation emergent degree value according to the temperature value displayed by the first-time thermal imager, the temperature value displayed by the second-time thermal imager, the temperature value displayed by the third-time thermal imager and the temperature value displayed by the fourth-time thermal imager;
and determining the transmittance of the transmission filter disc according to the first time blackbody radiation emergence value, the second time blackbody radiation emergence value, the third time blackbody radiation emergence value and the fourth time blackbody radiation emergence value.
Optionally, the covering the lens cover of the thermal imager and before acquiring the temperature value displayed by the thermal imager at the first time further includes:
and starting up and preheating the thermal imager and the black body which are processed at constant temperature.
Optionally, the thermal imager, the transmittance sheet, the light shielding plate and the black body are placed in a dark room for constant temperature treatment, and the method specifically includes:
and placing the thermal imager, the transmittance sheet, the light shielding plate and the black body in a dark room for constant temperature treatment for at least two hours.
Optionally, the starting up and preheating the thermal imager and the black body which are processed at constant temperature specifically includes:
and starting up and preheating the thermal imager and the black body which are subjected to constant temperature treatment for at least half an hour, wherein the temperature of the black body after preheating is 30-50 ℃ higher than that of a dark room.
Optionally, the covering the lens cover of the thermal imager, and reading the temperature value displayed by the thermal imager at the first moment specifically include:
and when the starting time of the thermal imager reaches a set value, covering a lens cover of the thermal imager, receiving environmental radiation in a darkroom by the thermal imager, and reading a temperature value displayed by the thermal imager at the first moment.
Optionally, the lens cover of the thermal imager is opened, the black body is located at a set distance right in front of the thermal imager, and the temperature value displayed by the thermal imager at the second moment is read, which specifically includes:
and opening a lens cover of the thermal imager, positioning the black body one meter right in front of the thermal imager, receiving the environmental radiation in the dark room and the black body radiation of the black body by the thermal imager, and reading the temperature value displayed by the thermal imager at the second moment.
Optionally, the shielding plate is used to shield the black body, the transmittance sheet is installed in front of the thermal imager lens, and the temperature value displayed by the thermal imager at the third moment is read, which specifically includes:
and covering the black body by using the light shielding plate, installing the transmittance sheet in front of the thermal imager lens, wherein the radiation received by the thermal imager is the radiation of the transmittance sheet, the transmittance sheet reflects the radiation of the thermal imager and the radiation of the environment through the transmittance sheet, and the temperature value displayed by the thermal imager at the third moment is read.
Optionally, the removing the light shielding plate, keeping the transmittance sheet still, and reading the temperature value displayed by the thermal imager at the fourth time specifically includes:
and removing the light shielding plate, keeping the transmittance sheet still, and reading the temperature value displayed by the thermal imager at the fourth moment by the thermal imager after the black body and the darkroom environment pass through the transmittance sheet, the radiation of the transmittance sheet and the radiation of the reflection thermal imager received by the thermal imager.
Optionally, the determining, according to the temperature value displayed by the thermal imager at the first time, the temperature value displayed by the thermal imager at the second time, the temperature value displayed by the thermal imager at the third time, and the temperature value displayed by the thermal imager at the fourth time, the corresponding first time blackbody radiation emission degree value, the corresponding second time blackbody radiation emission degree value, the corresponding third time blackbody radiation emission degree value, and the corresponding fourth time blackbody radiation emission degree value specifically include:
according to the temperature value displayed by the thermal imager at the first moment, the temperature value displayed by the thermal imager at the second moment, the temperature value displayed by the thermal imager at the third moment and the temperature value displayed by the thermal imager at the fourth moment, adopting a formula M ═ sigma T4Determining a corresponding first time blackbody radiation emergence degree value, a second time blackbody radiation emergence degree value, a third time blackbody radiation emergence degree value and a fourth time blackbody radiation emergence degree value;
wherein T is the temperature value displayed by the thermal imager at different moments, M is the blackbody radiation emergence degree value at different moments, and sigma is the Stefan-Boltzmann constant.
Optionally, determining the transmittance of the transmission filter according to the first time blackbody radiation emergence value, the second time blackbody radiation emergence value, the third time blackbody radiation emergence value and the fourth time blackbody radiation emergence value specifically includes:
according to the first time blackbody radiation emergence degree value, the second time blackbody radiation emergence degree value, the third time blackbody radiation emergence degree value and the fourth time blackbody radiation emergence degree value, a formula is adopted
Determining the transmittance through the filter;
wherein τ is the transmittance through the filter sheet, MsIs the blackbody radiation exitance value, M, at the first momenthIs blackbody radiation exitance value, M, at the second momentpIs the blackbody radiation exitance value, M, at the third momentτIs a fourthAnd (4) the blackbody radiation exitance value at the moment.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a method for determining integral transmittance of an infrared transmittance sheet, which comprises the steps of detecting by using a transmittance sheet, a black body, a thermal imager and a light shielding plate device, receiving infrared radiation emitted by the black body by the thermal imager through the transmittance sheet, displaying an image absolute temperature value by the thermal imager in real time, deducing by substituting a formula, converting the temperature of each point displayed by the thermal imager in real time into radiation exitance, and calculating the integral transmittance of the transmittance sheet. The method has the advantages of accurate and simple measurement, rapid and accurate measurement of the transmittance, few optical elements in the light path, small external interference and simple and convenient measurement method.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described 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 without inventive exercise.
FIG. 1 is a flow chart of a method for determining integral transmittance of an infrared transmittance patch in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating temperature value acquisition displayed by a thermal imager at a first time according to an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating temperature value acquisition displayed by the thermal imager at a second moment according to the embodiment of the invention;
FIG. 4 is a schematic diagram illustrating temperature value acquisition by the thermal imager at the third moment according to the embodiment of the invention;
fig. 5 is a schematic diagram illustrating temperature value acquisition displayed by the thermal imager at a fourth time according to the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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.
The invention aims to provide a method for determining integral transmittance of an infrared transmittance sheet, which can realize rapid and accurate measurement of transmittance.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a method for determining an integral transmittance of an infrared transmittance sheet according to an embodiment of the present invention. As shown in fig. 1, a method for determining integral transmittance of an infrared transmittance sheet is applied to a device for determining integral transmittance of an infrared transmittance sheet, the device includes a thermal imager, a transmission filter, a light shielding plate and a black body, which are sequentially arranged, the black body is an infrared radiation source, the thermal imager is an infrared receiving device, and the method includes:
step 101: placing the thermal imager, the transmittance sheet, the light shielding plate and the black body in a dark room for constant temperature treatment;
step 102: covering a lens cover of the thermal imager, and reading a temperature value displayed by the thermal imager at the first moment;
step 103: opening a lens cover of the thermal imager, positioning the black body at a set distance right in front of the thermal imager, and reading a temperature value displayed by the thermal imager at a second moment;
step 104: covering the black body by using the light shielding plate, installing the transmittance sheet in front of the thermal imager lens, and reading a temperature value displayed by the thermal imager at a third moment;
step 105: removing the shading plate, keeping the transmittance sheet still, and reading a temperature value displayed by the thermal imager at a fourth moment;
step 106: determining a corresponding first-time blackbody radiation emergent degree value, a second-time blackbody radiation emergent degree value, a third-time blackbody radiation emergent degree value and a fourth-time blackbody radiation emergent degree value according to the temperature value displayed by the first-time thermal imager, the temperature value displayed by the second-time thermal imager, the temperature value displayed by the third-time thermal imager and the temperature value displayed by the fourth-time thermal imager;
step 107: and determining the transmittance of the transmission filter disc according to the first time blackbody radiation emergence value, the second time blackbody radiation emergence value, the third time blackbody radiation emergence value and the fourth time blackbody radiation emergence value.
Before step 102, it should also be done:
starting up and preheating the thermal imager and the black body which are processed at constant temperature; specifically, the thermal imager and the black body which are processed at constant temperature are started to be preheated for at least half an hour, and the temperature of the black body after being preheated is 30-50 ℃ higher than that of a dark room. The thermal imager and the black body are started for a long time, so that the thermal imager can be waited for heat dissipation balance, the temperature of the black body is stable, the accuracy of subsequent measurement is ensured, and the thermal imager and the black body are not interfered by the thermal imager. The temperature of the black body is 30-50 ℃ higher than the room temperature, the thermal imager is characterized in that the received radiation is converted into a thermal image, the temperature of the black body radiation is 30-50 ℃ higher than the temperature of the background environment, and the thermal imager is ensured to display clear and stable images and distinguish the images from the background.
and placing the thermal imager, the transmittance sheet, the light shielding plate and the black body in a dark room for constant temperature treatment for at least two hours. The test instrument is placed in a constant-temperature dark room for a long time enough to consume external infrared radiation, so that the accuracy of a test result is ensured to be not interfered.
and when the starting time of the thermal imager reaches a set value, covering a lens cover of the thermal imager, receiving environmental radiation in a darkroom by the thermal imager, and reading a temperature value displayed by the thermal imager at the first moment. Fig. 2 is a schematic diagram of obtaining a temperature value displayed by the thermal imager at the first time in the embodiment of the invention. In fig. 2, reference numeral 1 denotes a thermal imager, and 11 denotes a lens cover.
and opening a lens cover of the thermal imager, positioning the black body one meter right in front of the thermal imager, receiving the environmental radiation in the dark room and the black body radiation of the black body by the thermal imager, and reading the temperature value displayed by the thermal imager at the second moment. Fig. 3 is a schematic diagram illustrating temperature value acquisition displayed by the thermal imager at the second time in the embodiment of the invention. In fig. 3, symbol 1 is a thermal imager and symbol 4 is a black body.
and covering the black body by using the light shielding plate, installing the transmittance sheet in front of the thermal imager lens, wherein the radiation received by the thermal imager is the radiation of the transmittance sheet, the transmittance sheet reflects the radiation of the thermal imager and the radiation of the environment through the transmittance sheet, and the temperature value displayed by the thermal imager at the third moment is read. In this step, the transmittance sheet and the thermal imager lens are closely and rotatably engaged, so that no ambient radiation exists between the transmittance sheet and the thermal imager lens, but ambient radiation exists between the transmittance sheet and the light shielding plate, and the adjustment is performed in fig. 4 in order to indicate the radiation source. Fig. 4 is a schematic diagram of obtaining a temperature value displayed by the thermal imager at the third time in the embodiment of the invention. In fig. 4, reference numeral 1 denotes a thermal imager, 2 denotes a transmittance sheet, 3 denotes a light shielding plate, and 4 denotes a black body.
and removing the light shielding plate, keeping the transmittance sheet still, and reading the temperature value displayed by the thermal imager at the fourth moment by the thermal imager after the black body and the darkroom environment pass through the transmittance sheet, the radiation of the transmittance sheet and the radiation of the reflection thermal imager received by the thermal imager. Fig. 5 is a schematic diagram illustrating temperature value acquisition displayed by the thermal imager at a fourth time according to the embodiment of the invention. In fig. 5, reference numeral 1 denotes a thermal imager, 2 denotes a transmittance sheet, and 4 denotes a black body.
according to the temperature value displayed by the thermal imager at the first moment, the temperature value displayed by the thermal imager at the second moment, the temperature value displayed by the thermal imager at the third moment and the temperature value displayed by the thermal imager at the fourth moment, adopting a formula M ═ sigma T4Determining the corresponding first time blackbody radiation emergence degree, the second time blackbody radiation emergence degree, the third time blackbody radiation emergence degree and the fourth time blackbody radiation emergence degreeA value;
wherein T is the temperature value displayed by the thermal imager at different moments, M is the blackbody radiation emergence degree value at different moments, and sigma is the Stefan-Boltzmann constant.
Planck's formula:
first radiation constant c1＝3.7418×10-16(W·m2)
Second radiation constantc2＝1.4388×10-2(m·K)
Integrating the Planck formula in the whole wavelength range to obtain the relationship between the blackbody radiation emittance and the temperature (Stefin-Boltzmann law)
Stefan-boltzmann constant σ 5.6696 × 10-8(W·m-2K-4)
λ1、λ2The range of the wave band of the measured radiation is generally 3-5 μm or 8-14 μm;
numerical modeling is carried out on a black body radiation table (the black body radiation table is compiled by utilizing the Ponke law and the Wien displacement law, which are not introduced here), and the relational expression of the table F (lambda T) -lambda T can be obtained:
F(x)＝p1*x^7+p2*x^6+p3*x^5+p4*x^4+p5*x^3+p6*x^2+p7*x+p8
p1＝1.003e-26(8.139e-27,1.193e-26)
p2＝-3.801e-22(-4.474e-22,-3.128e-22)
p3＝5.657e-18(4.703e-18,6.612e-18)
p4＝-4.11e-14(-4.798e-14,-3.422e-14)
p5＝1.427e-10(1.161e-10,1.693e-10)
p6＝-1.75e-07(-2.283e-07,-1.217e-07)
p7＝6.829e-05(1.964e-05,0.0001169)
p8＝-0.005424(-0.01994,0.009091)
according to the first time blackbody radiation emergence degree value, the second time blackbody radiation emergence degree value, the third time blackbody radiation emergence degree value and the fourth time blackbody radiation emergence degree value, a formula is adopted
Determining the transmittance through the filter;
wherein τ is the transmittance through the filter sheet, MsIs the blackbody radiation exitance value, M, at the first momenthIs blackbody radiation exitance value, M, at the second momentpIs the blackbody radiation exitance value, M, at the third momentτAnd the blackbody radiation exitance value at the fourth moment.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The integral transmittance determination method of the infrared transmittance sheet is characterized by being applied to an integral transmittance determination device of the infrared transmittance sheet, wherein the device comprises a thermal imager, a transmittance sheet, a light shielding plate and a black body which are sequentially arranged, and the method comprises the following steps of:
placing the thermal imager, the transmittance sheet, the light shielding plate and the black body in a dark room for constant temperature treatment;
covering a lens cover of the thermal imager, and reading a temperature value displayed by the thermal imager at the first moment;
opening a lens cover of the thermal imager, positioning the black body at a set distance right in front of the thermal imager, and reading a temperature value displayed by the thermal imager at a second moment;
covering the black body by using the light shielding plate, installing the transmittance sheet in front of the thermal imager lens, and reading a temperature value displayed by the thermal imager at a third moment;
removing the shading plate, keeping the transmittance sheet still, and reading a temperature value displayed by the thermal imager at a fourth moment;
determining a corresponding first-time blackbody radiation emergent degree value, a second-time blackbody radiation emergent degree value, a third-time blackbody radiation emergent degree value and a fourth-time blackbody radiation emergent degree value according to the temperature value displayed by the first-time thermal imager, the temperature value displayed by the second-time thermal imager, the temperature value displayed by the third-time thermal imager and the temperature value displayed by the fourth-time thermal imager;
and determining the transmittance of the transmittance sheet according to the first time blackbody radiation emergence value, the second time blackbody radiation emergence value, the third time blackbody radiation emergence value and the fourth time blackbody radiation emergence value.
2. The method for determining the integral transmittance of an infrared transmittance sheet according to claim 1, wherein the step of covering a lens cover of the thermal imager and obtaining the temperature value displayed by the thermal imager at the first moment further comprises:
and starting up and preheating the thermal imager and the black body which are processed at constant temperature.
3. The method for determining the integral transmittance of an infrared transmittance sheet according to claim 1, wherein the thermal imager, the transmittance sheet, the light shielding plate and the black body are placed in a dark room for constant temperature treatment, and specifically comprises:
and placing the thermal imager, the transmittance sheet, the light shielding plate and the black body in a dark room for constant temperature treatment for at least two hours.
4. The method for determining the integral transmittance of an infrared transmittance sheet according to claim 2, wherein the step of preheating the thermal imager and the black body after constant temperature treatment comprises:
and starting up and preheating the thermal imager and the black body which are subjected to constant temperature treatment for at least half an hour, wherein the temperature of the black body after preheating is 30-50 ℃ higher than that of a dark room.
5. The method for determining the integral transmittance of an infrared transmittance sheet according to claim 1, wherein the covering of the lens cover of the thermal imager reads the temperature value displayed by the thermal imager at the first moment, and specifically comprises:
and when the starting time of the thermal imager reaches a set value, covering a lens cover of the thermal imager, receiving environmental radiation in a darkroom by the thermal imager, and reading a temperature value displayed by the thermal imager at the first moment.
6. The method for determining the integral transmittance of an infrared transmittance sheet according to claim 1, wherein the opening of the lens cover of the thermal imager, the positioning of the black body at a set distance directly in front of the thermal imager, and the reading of the temperature value displayed by the thermal imager at the second time specifically comprise:
and opening a lens cover of the thermal imager, positioning the black body one meter right in front of the thermal imager, receiving the environmental radiation in the dark room and the black body radiation of the black body by the thermal imager, and reading the temperature value displayed by the thermal imager at the second moment.
7. The method for determining the integral transmittance of an infrared transmittance sheet as claimed in claim 1, wherein the step of covering the black body with the light shielding plate, placing the transmittance sheet in front of the lens of the thermal imager, and reading the temperature value displayed by the thermal imager at the third moment comprises the steps of:
and covering the black body by using the light shielding plate, installing the transmittance sheet in front of the thermal imager lens, wherein the radiation received by the thermal imager is the radiation of the transmittance sheet, the transmittance sheet reflects the radiation of the thermal imager and the radiation of the environment through the transmittance sheet, and the temperature value displayed by the thermal imager at the third moment is read.
8. The method for determining the integrated transmittance of an infrared transmittance sheet according to claim 1, wherein the removing the light shielding plate, keeping the transmittance sheet still, and reading the temperature value displayed by the thermal imager at the fourth time specifically comprises:
and removing the light shielding plate, keeping the transmittance sheet still, and reading the temperature value displayed by the thermal imager at the fourth moment by the thermal imager after the black body and the darkroom environment pass through the transmittance sheet, the radiation of the transmittance sheet and the radiation of the reflection thermal imager, which are received by the thermal imager.
9. The method for determining the integral transmittance of an infrared transmittance sheet according to claim 1, wherein the determining the corresponding first time blackbody radiation emission degree value, the second time blackbody radiation emission degree value, the third time blackbody radiation emission degree value and the fourth time blackbody radiation emission degree value according to the temperature value displayed by the thermal imager at the first time, the temperature value displayed by the thermal imager at the second time, the temperature value displayed by the thermal imager at the third time and the temperature value displayed by the thermal imager at the fourth time specifically comprises:
according to the temperature value displayed by the thermal imager at the first moment, the temperature value displayed by the thermal imager at the second moment, the temperature value displayed by the thermal imager at the third moment and the temperature value displayed by the thermal imager at the fourth moment, adopting a formula M ═ sigma T4Determining a corresponding first time blackbody radiation emergence degree value, a second time blackbody radiation emergence degree value, a third time blackbody radiation emergence degree value and a fourth time blackbody radiation emergence degree value;
wherein T is the temperature value displayed by the thermal imager at different moments, M is the blackbody radiation emergence degree value at different moments, and sigma is the Stefan-Boltzmann constant.
10. The method of claim 1, wherein the determining the transmittance of the transmittance slice according to the blackbody radiation exitance value at the first time, the blackbody radiation exitance value at the second time, the blackbody radiation exitance value at the third time, and the blackbody radiation exitance value at the fourth time specifically comprises:
according to the first time blackbody radiation emergence degree value, the second time blackbody radiation emergence degree value, the third time blackbody radiation emergence degree value and the fourth time blackbody radiation emergence degree value, a formula is adopted
Determining the transmittance of the transmittance sheet;
wherein τ is the transmittance of the transmittance sheet, MsIs the blackbody radiation exitance value, M, at the first momenthIs blackbody radiation exitance value, M, at the second momentpIs the blackbody radiation exitance value, M, at the third momentτAnd the blackbody radiation exitance value at the fourth moment.
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| CN103063312B (en) * | 2012-12-29 | 2015-01-14 | 南京理工大学 | Measuring system and method for measuring object emissivity |
| JP6485953B2 (en) * | 2015-03-24 | 2019-03-20 | 国立研究開発法人日本原子力研究開発機構 | Infrared emissivity measuring apparatus and infrared emissivity measuring method |
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| CN109060731B (en) * | 2018-06-25 | 2020-04-03 | 中国科学院西安光学精密机械研究所 | Device and method for testing spectral transmittance of infrared optical system |
| CN109297685A (en) * | 2018-11-15 | 2019-02-01 | 中国电子科技集团公司第四十研究所 | A kind of spectral transmittance test device and method for heavy caliber parallel light tube |
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