CN114993476B - Smoke interference infrared radiation brightness calculation method - Google Patents
Smoke interference infrared radiation brightness calculation method Download PDFInfo
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- CN114993476B CN114993476B CN202210924671.1A CN202210924671A CN114993476B CN 114993476 B CN114993476 B CN 114993476B CN 202210924671 A CN202210924671 A CN 202210924671A CN 114993476 B CN114993476 B CN 114993476B
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- 230000005855 radiation Effects 0.000 title claims abstract description 66
- 239000000779 smoke Substances 0.000 title claims abstract description 41
- 238000004364 calculation method Methods 0.000 title claims abstract description 31
- 230000003595 spectral effect Effects 0.000 claims abstract description 35
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 238000002834 transmittance Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
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Abstract
The invention discloses a smoke interference infrared radiation brightness calculation method, which divides temperature smoke into layers with uniform temperature and pressure, sequentially calculates the optical thickness of each layer, the spectral transmittance of each layer and the spectral radiation brightness of each layer, and sums the layer number and the wave number to obtain the wave band value of the radiation brightness along any direction, thereby realizing the calculation of the smoke interference infrared radiation brightness.
Description
Technical Field
The invention relates to the field of infrared radiation brightness calculation, in particular to a smoke interference infrared radiation brightness calculation method.
Background
The infrared radiation is an electromagnetic wave, is positioned at the outer end of visible light red light, radiates infrared energy at an object above absolute zero (-273 ℃), and is the basis of an infrared temperature measurement technology. The radiant emittance, radiant exitance, radiant intensity, radiant power and the like of infrared radiation are all related calculated quantities related to infrared radiation in physics. The infrared radiation brightness mainly comprises self radiation brightness, reflected sunlight radiation brightness, reflected sky background radiation brightness and reflected atmosphere heat radiation brightness, the infrared radiation brightness emitted by a target reaches the analog camera through atmospheric attenuation, and weather characteristics such as rain, snow, fog and the like need to be comprehensively considered in the atmospheric attenuation to calculate an attenuation value.
The existing infrared radiance calculation does not perform system analysis on smoke interference, and smoke interference factors are not considered in the infrared radiance calculation process, so that a large error exists in the infrared radiance calculation process, and the calculation is inaccurate, so that a smoke interference infrared radiance calculation method is urgently needed to solve the problems.
Disclosure of Invention
The invention aims to provide a smoke interference infrared radiation brightness calculation method to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a smoke interference infrared radiation brightness calculation method comprises the following steps:
the method comprises the following steps: dividing the temperature smoke into layers with uniform temperature and pressure, wherein each layer has a geometric thickness of delta l m At a temperature of T m Component pressure of p m (m＝1,2，...)；
Step two: the optical thickness of each layer is calculated by the following formula:
Δu m represents the optical thickness of each layer;
step three: calculating the spectral transmittance of each layer according to the following formula:
τ m,λ represents the spectral transmittance of each layer;
k is the thickness of each layer in m;
l represents the total path length of infrared radiation through smoke;
dv represents the visibility of smoke in Km;
λ represents the radiation wavelength in um;
step four: calculating the spectral radiance of each layer, wherein the formula is as follows:
L m,λ representing spectral radiation of each layerThe brightness of the light emitted from the light source,
spectral radiance expressed as a black body, the formula is as follows:
step five: the number of layers and the wave number are summed to obtain a wave band value of the radiation brightness along any direction, and the formula is as follows:
wherein C1 represents a first radiation constant 3.7418 × 10 -16 (W·m 2 ) (ii) a λ is the radiation wavelength, in um; c2 represents a second radiation constant 1.4388 × 10 -2 (m.K); t represents the surface temperature of the material and has a unit of K; ε (λ) is the self emissivity given in sr -1 ；
Compared with the prior art, the invention has the beneficial effects that:
the infrared radiation brightness calculation method based on the smoke interference comprises the steps of dividing temperature smoke into layers with uniform temperature and pressure, sequentially calculating optical thickness of each layer, calculating spectral transmittance of each layer and calculating spectral radiation brightness of each layer, summing the number of layers and wave number to obtain a wave band value of radiation brightness in any direction, and accordingly achieving calculation of infrared radiation brightness of smoke interference.
Detailed Description
The technical solutions of the present invention are further described in detail with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example one
A smoke interference infrared radiation brightness calculation method comprises the following steps:
the method comprises the following steps: dividing the temperature smoke into layers with uniform temperature and pressure, wherein each layer has a geometric thickness of delta l m At a temperature of T m Component pressure of p m (m＝1,2，...)；
Step two: the optical thickness of each layer is calculated by the following formula:
Δu m represents the optical thickness of each layer;
step three: the spectral transmittance of each layer is calculated according to the following formula:
τ m,λ represents the spectral transmittance of each layer;
step four: calculating the spectral radiance of each layer, wherein the formula is as follows:
L m,λ representing the spectral radiance of each layer,
spectral radiance expressed as a black body, the formula is as follows:
step five: the number of layers and the wave number are summed to obtain a wave band value of the radiation brightness along any direction, and the formula is as follows:
wherein C1 represents a first radiation constant 3.7418 × 10 -16 (W·m 2 ) (ii) a λ is the radiation wavelength, in um; c2 represents a second radiation constant 1.4388 × 10 -2 (m.K); t represents the surface temperature of the material and has a unit of K; ε (λ) is the self-emissivity given in sr -1 ；
Specifically, the following are: the infrared radiation brightness calculation of the smoke interference can be realized through the steps of dividing the temperature smoke into layers with uniform temperature and pressure, sequentially calculating the optical thickness of each layer, the spectral transmittance of each layer and the spectral radiation brightness of each layer, and summing the number of layers and wave numbers to obtain the wave band value of the radiation brightness along any direction.
Example two
A smoke interference infrared radiation brightness calculation method comprises the following steps:
the method comprises the following steps: dividing the temperature smoke into layers with uniform temperature and pressure, wherein each layer has a geometric thickness of delta l m At a temperature of T m Component pressure of p m (m＝1,2，...)；
Step two: the optical thickness of each layer is calculated by the following formula:
Δu m represents the optical thickness of each layer;
step three: the spectral transmittance of each layer is calculated according to the following formula:
τ m,λ represents the spectral transmittance of each layer;
preferably, in this embodiment, L represents the total path length of infrared radiation passing through the smoke, and
dv denotes the visibility of smoke in Km and λ denotes the wavelength of the radiation in um.
Step four: calculating the spectral radiance of each layer, wherein the formula is as follows:
L m,λ representing the spectral radiance of each layer,
spectral radiance expressed as a black body, the formula is as follows:
step five: the number of layers and the wave number are summed to obtain a wave band value of the radiation brightness along any direction, and the formula is as follows:
specifically, the following are: in the second embodiment, compared with the first embodiment, the infrared radiation brightness calculation method for smoke interference is more complete by dividing temperature smoke into layers with uniform temperature and pressure, sequentially performing optical thickness calculation, spectral transmittance calculation and spectral radiation brightness calculation of each layer, summing the number of layers and wave number to obtain a wave band value of radiation brightness along any direction, and more specifically explaining the steps.
EXAMPLE III
A smoke interference infrared radiation brightness calculation method comprises the following steps:
step (ii) ofFirstly, the method comprises the following steps: dividing the temperature smoke into layers with uniform temperature and pressure, wherein each layer has a geometric thickness of delta l m At a temperature of T m Component pressure of p m (m＝1,2，...)；
Step two: the optical thickness of each layer is calculated by the following formula:
Δu m represents the optical thickness of each layer;
step three: the spectral transmittance of each layer is calculated according to the following formula:
τ m,λ represents the spectral transmittance of each layer;
preferably, in this embodiment, L represents the total path length of infrared radiation passing through the smoke, and
dv denotes the visibility of smoke in Km and λ denotes the wavelength of the radiation in um.
Step four: calculating the spectral radiance of each layer, wherein the formula is as follows:
L m,λ representing the spectral radiance of each layer,
spectral radiance expressed as a black body, the formula is as follows:
step five: the number of layers and the wave number are summed to obtain a wave band value of the radiation brightness along any direction, and the formula is as follows:
wherein C1 represents a first radiation constant 3.7418 × 10 -16 (W·m 2 ) (ii) a λ is the radiation wavelength, in um; c2 represents a second radiation constant 1.4388 × 10 -2 (m.K); t represents the surface temperature of the material and has a unit of K; ε (λ) is the self-emissivity given in sr -1 ；
Specifically, the following are: the infrared radiation brightness calculation method based on the smoke interference comprises the steps of dividing temperature smoke into layers with uniform temperature and pressure, sequentially calculating the optical thickness of each layer, calculating the spectral transmittance of each layer and calculating the spectral radiation brightness of each layer, and summing the number of layers and the number of waves to obtain the wave band value of the radiation brightness in any direction, so that the infrared radiation brightness calculation based on the smoke interference is realized.
Moreover, smoke interference factors which can interfere and influence the infrared radiation brightness calculation are considered in the infrared radiation brightness calculation process, so that the smoke interference factors can be considered more comprehensively in the calculation, more accurate calculation results can be obtained, and the calculation error of the infrared radiation brightness interfered by smoke is reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (1)
1. A smoke interference infrared radiation brightness calculation method is characterized by comprising the following steps:
the method comprises the following steps: dividing the temperature smoke into layers with uniform temperature and pressure, wherein each layer has a geometric thickness of delta l m At a temperature of T m Component pressure of p m (m＝1,2，...)；
Step two: the optical thickness of each layer is calculated by the following formula:
Δu m represents the optical thickness of each layer;
step three: the spectral transmittance of each layer is calculated according to the following formula:
τ m,λ represents the spectral transmittance of each layer;
k is the thickness of each layer in m;
l represents the total path length of infrared radiation through smoke;
dv represents the visibility of smoke in Km;
λ represents the radiation wavelength in um;
step four: calculating the spectral radiance of each layer, wherein the formula is as follows:
L m,λ representing the spectral radiance of each layer,
spectral radiance expressed as a black body, the formula is as follows:
wherein C1 represents a first radiation constant 3.7418 × 10 -16 (W·m 2 ) (ii) a λ is the radiation wavelength, in um; c2 represents a second radiation constant 1.4388 × 10 -2 (m.K); t represents the surface temperature of the material and has a unit of K; ε (λ) is the self-emissivity given in sr -1 ；
Step five: the number of layers and the wave number are summed to obtain a wave band value of the radiation brightness along any direction, and the formula is as follows:
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| FR2437638A1 (en) * | 1978-09-29 | 1980-04-25 | Anvar | PROCESS FOR THE TRANSFORMATION OF THERMAL IMAGES, IN PARTICULAR INTO VISIBLE IMAGES, AND DEVICE FOR IMPLEMENTING SAME |
| USRE33857E (en) * | 1983-02-22 | 1992-03-24 | Weyerhaeuser Company | Imaging of hot infrared emitting surfaces obscured by particulate fume and hot gases |
| JPS60129626A (en) * | 1983-12-17 | 1985-07-10 | Ishikawajima Harima Heavy Ind Co Ltd | Optical temperature distribution measurement |
| US20100258726A1 (en) * | 2009-04-08 | 2010-10-14 | Honeywell International Inc. | Radiation power detector |
| CN103674904B (en) * | 2012-09-25 | 2016-05-18 | 中国航天科工集团第二研究院二〇七所 | The quick modification method of propagation in atmosphere in infrared characteristic measurement |
| CN103808414B (en) * | 2013-10-25 | 2016-09-21 | 陕西晟辉投资有限公司 | A kind of overlength distance heat detector |
| CN105243289B (en) * | 2015-11-17 | 2018-03-06 | 上海无线电设备研究所 | Complex target infrared signature method of integrated modeling |
| CN105928620B (en) * | 2016-04-14 | 2019-09-10 | 中国科学院地理科学与资源研究所 | A kind of thermal infrared atmospheric correction parametric method based on look-up table |
| CN106599400A (en) * | 2016-11-28 | 2017-04-26 | 西安天圆光电科技有限公司 | Fast calculation and dynamic simulation method of aircraft tail flame infrared radiation |
| CN108072459A (en) * | 2017-12-12 | 2018-05-25 | 中国舰船研究设计中心 | A kind of method for measuring steel billet temperature field and calculating its radiation intensity |
| CN109029713A (en) * | 2018-07-25 | 2018-12-18 | 中国航空工业集团公司沈阳飞机设计研究所 | Face side atmosphere infra-red radiation brightness calculation method |
| CN109029725B (en) * | 2018-08-15 | 2021-05-28 | 合肥泰达光电科技有限公司 | Deep ultraviolet, visible and near infrared radiation calibration source device |
| CN112611373B (en) * | 2020-12-30 | 2022-05-20 | 哈尔滨工业大学 | Method for analyzing aerodynamic thermal effect of flow field of near-earth space short-wave infrared star sensor |
| CN113533262B (en) * | 2021-03-24 | 2022-11-04 | 北京航空航天大学 | Atmospheric aerosol infrared scattering transmittance determination method |
| CN114492006A (en) * | 2022-01-17 | 2022-05-13 | 成都众享天地网络科技有限公司 | Infrared radiation brightness calculation method for simulation |
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