CN103868921A - Method for determining emissivity of key surface coating of weak target detection infrared camera - Google Patents
Method for determining emissivity of key surface coating of weak target detection infrared camera Download PDFInfo
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- CN103868921A CN103868921A CN201410073596.8A CN201410073596A CN103868921A CN 103868921 A CN103868921 A CN 103868921A CN 201410073596 A CN201410073596 A CN 201410073596A CN 103868921 A CN103868921 A CN 103868921A
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Abstract
The invention relates to a method for determining the emissivity of a key surface coating of a weak target detection infrared camera. Stray light of the weak target detection infrared camera is divided into inside stray light and outside stray light. When the emissivity of a key surface is selected, the influence of an inhibiting measure to the inside stray light is in conflict with that of the inhibiting measure to the outside stray light, so that a comprehensive inhibiting measure is adopted for the inside stray light and the outside stray light of an infrared optical remote sensor. The method can be used for finding out the optimal value of the emissivity of the surface coating by analyzing the variation trend of the inside stray light and the outside stray light when the value of the emissivity of the key surface coating of the weak target detection infrared camera is changed, thus enabling the emissivity to meet the comprehensive inhibiting requirement of the inside stray light and the outside stray light at the same time.
Description
Technical field
The present invention relates to a kind of weak target detection infrared camera critical surfaces coating emissivity and determine method, be mainly used in the stray radiation analysis and inhibition design of weak target detection infrared camera of aviation or space industry.
Background technology
For the weak target detection infrared camera under a duty, for example infrared seeker camera or space-based infrared early warning camera, parasitic light on the infrared detector array of arrival camera can be divided into two large classes: a class is the parasitic light beyond camera object space visual field, be called external stray light, source of stray light diffuses as sunshine and ground vapour; Another kind of be camera optical-mechanical system from inside produce heat radiation, be called inner parasitic light, the element surfaces such as source of stray light such as construction package, lens, catoptron etc., this part parasitic light is by the temperature of system self, the factor such as emissivity and the area decision of surface thermal radiation occurs.In weak target detection infrared camera, no matter inner parasitic light or external stray light, if inhibition is undesirable, all can cause erroneous judgement or false-alarm to target, the greatly detection usefulness of impact to target.
At present the braking measure of infrared camera optical system stray light level is mainly comprised to three major types: Part I is the macrostructure control to parasitic light, and its major measure is taked such as the mode such as light shield, baffle vane; Equations of The Second Kind is the micromechanism control to parasitic light, and its major measure is taked schemes such as the micro-screw thread in surface, surfaceness rationalization; The 3rd class is mainly utilized surperficial coating characteristic.
According to Planck law, the emissivity of radiation source surface coating increases, and Enhanced Radiation Reduced Blast is derived to the gray-body radiation power that body produces, thereby has increased the impact of inner parasitic light on systemic resolution.But, suppress when external stray light, by effects on surface figure black coating, increase as far as possible radiation energy absorption, reduce the reflection of radiation energy and improve surperficial scattering properties, also increase spectral emittance simultaneously but increase spectral absorption.Therefore, in the time choosing the emissivity of surface coating, often conflicting to the inhibiting effect of parasitic light in portion and external stray light.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the conflicting present situation of existing weak target detection infrared camera critical surfaces coating emissivity design inhibition internal, outside veiling glare, provide a kind of weak target detection infrared camera critical surfaces coating emissivity to determine method, the variation tendency of inner parasitic light and external stray light while change by analyzing weak target detection infrared camera critical surfaces coating emissivity value, find out the optimal value of surface coating emissivity, make this emissivity meet the comprehensive inhibition requirement of inner parasitic light and external stray light simultaneously.
Technical solution of the present invention is: a kind of weak target detection infrared camera critical surfaces coating emissivity is determined method, it is characterized in that performing step is as follows:
(1) find out the critical surfaces identical with external stray light for inner parasitic light; Described inside parasitic light refers to weak target detection infrared camera system from the heat radiation producing in inside, source of stray light, the element surfaces such as such as construction package, lens, catoptron, this part parasitic light is by the temperature of camera self, the factor such as slin emissivity and the area decision of hot radiant element occurs; Described external stray light refers to the parasitic light beyond weak target detection infrared camera object space visual field, and source of stray light diffuses as sunshine, ground vapour; By the analysis to inner parasitic light and external stray light, find out respectively all critical surfaces relevant to inside and outside portion parasitic light, find out the critical surfaces identical with external stray light for inner parasitic light; Described critical surfaces may comprise 1 or more than 1, if 1 critical surfaces is carried out following step 1 time; If more than 1, repeat respectively following step according to the number of critical surfaces;
(2) critical surfaces described in step (1) is arranged to different slin emissivity values, the upper and lower bound of emissivity all depends on current engineering reality, 9 emissivity are for example set by 0.1～0.9, be spaced apart 0.1, re-start the inside parasitic light of weak target detection infrared camera and the analysis of external stray light, find out respectively the trend that inner parasitic light and external stray light change with emissivity;
(3) if the inside parasitic light described in step (2) is identical with the trend that external stray light changes with emissivity, get the maximal value 0.9 of reflectivity; If the inside parasitic light in step (2) is different with the trend that external stray light changes with emissivity, calculate respectively the weighted value of inner parasitic light and external stray light under different emissivity, the weighted value of inner parasitic light and external stray light under different emissivity is added and, find out that weighted value adds and hour corresponding emissivity value, this emissivity value is the emissivity value of critical surfaces, has now completed the comprehensive inhibition of weak target detection infrared camera parasitic light.
The present invention's beneficial effect is compared with prior art:
(1) the present invention has overcome the conflicting present situation of existing weak target detection infrared camera critical surfaces coating emissivity design inhibition internal, outside veiling glare, the variation tendency of inner parasitic light and external stray light while change by analyzing weak target detection infrared camera critical surfaces coating emissivity value, find out the optimal value of surface coating emissivity, make this emissivity meet the comprehensive inhibition requirement of inner parasitic light and external stray light simultaneously.
(2) surface coating emissivity method for designing proposed by the invention has embodied the inner parasitic light of weak target detection infrared camera and the comprehensive analysis of external stray light and the thought of inhibition, the method is applied in concrete weak target detection infrared camera stray radiation analysis, can be camera best stray radiation braking measure is provided, the detection usefulness that improves weak Infrared Targets camera is had great importance.
Accompanying drawing explanation
Fig. 1 is the realization flow figure of critical surfaces coating emissivity method for designing of the present invention.
Embodiment
The specific embodiment of the present invention as shown in Figure 1, is mainly divided into following three steps and implements:
Step 1, finds out for the identical critical surfaces of inside and outside portion parasitic light.Described inside parasitic light refers to weak target detection infrared camera system from the heat radiation producing in inside, the element surfaces such as source of stray light such as construction package, lens, catoptron etc., this part parasitic light is by the temperature of camera self, the factor such as slin emissivity and the area decision of hot radiant element occurs; Described external stray light refers to the parasitic light beyond weak target detection infrared camera object space visual field, and source of stray light diffuses as sunshine, ground vapour.By the analysis to inner parasitic light and external stray light, find out respectively all critical surfaces relevant to inside and outside portion parasitic light, find out for the two identical critical surfaces.Described critical surfaces may comprise 1 or more than 1, if 1 critical surfaces is carried out step 2 and step 31 time; If more than 1,, according to repeating step 2 and step 3, multiplicity is identical with critical surfaces number.
Step 2, critical surfaces described in step 1 is arranged to different slin emissivity values, the upper and lower bound of emissivity all depends on current engineering reality, 9 emissivity are set by 0.1～0.9, be spaced apart 0.1, carry out the analysis and calculation of the inside and outside portion parasitic light of weak target detection infrared camera, obtain the weighted value of inside and outside parasitic light under 9 emissivity, Figure 2 shows that the result of calculation of the inside and outside portion parasitic light to Infrared Targets camera a little less than certain, this figure has listed the weighted value of inside and outside portion parasitic light along with the variation of surface coating emissivity.
Step 3, finds the trend that inside and outside portion parasitic light changes with emissivity, if the trend that the inside and outside parasitic light described in step 2 changes with emissivity is identical, gets the maximal value 0.9 of reflectivity; If the trend difference that the inside and outside parasitic light in step (2) changes with emissivity, the value inhibition internal, outside stray radiation of the unified emissivity of explanation is contradiction, as shown in table 1,
The inside parasitic light of the different emissivity critical surfaces of table 1 and external stray light weight
The weighted value of inside and outside parasitic light under different emissivity is added and, find out that weighted value adds and hour corresponding emissivity value, this emissivity value is the emissivity value of critical surfaces, in table 1, this critical surfaces coating emissivity is got 0.7 o'clock, the weighted value of inside and outside portion parasitic light adds and is minimum value, now, the optimal value of the critical surfaces coating emissivity of this weak target detection infrared camera parasitic light is 0.7, and this flow process finishes.
The content that the present invention is not described in detail belongs to those skilled in the art's known technology.
Claims (1)
1. a little less than, target detection infrared camera critical surfaces coating emissivity is determined a method, it is characterized in that performing step is as follows:
(1) find out the critical surfaces identical with external stray light for inner parasitic light; Described inside parasitic light refers to weak target detection infrared camera system from the heat radiation, the source of stray light that produce in inside, and this part parasitic light is to be determined by the temperature of camera self, the slin emissivity that hot radiant element occurs and area factor; Described external stray light refers to the parasitic light beyond weak target detection infrared camera object space visual field; By the analysis to inner parasitic light and external stray light, find out respectively all critical surfaces relevant to inside and outside portion parasitic light, find out the critical surfaces identical with external stray light for inner parasitic light; Described critical surfaces may comprise 1 or more than 1, if 1 critical surfaces is carried out following step (2) once; If more than 1, repeat respectively following step (2) according to the number of critical surfaces;
(2) critical surfaces described in step (1) is arranged to different slin emissivity values, the upper and lower bound of emissivity all depends on current engineering reality, 9 emissivity are set by 0.1～0.9, be spaced apart 0.1, re-start the inside parasitic light of weak target detection infrared camera and the analysis of external stray light, find out respectively the trend that inner parasitic light and external stray light change with emissivity;
(3) if the inside parasitic light described in step (2) is identical with the trend that external stray light changes with emissivity, get the maximal value 0.9 of reflectivity; If the inside parasitic light in step (2) is different with the trend that external stray light changes with emissivity, calculate respectively the weighted value of inner parasitic light and external stray light under different emissivity, the weighted value of inner parasitic light and external stray light under different emissivity is added and, find out that weighted value adds and hour corresponding emissivity value, this emissivity value is the emissivity value of critical surfaces, has now completed the comprehensive inhibition of weak target detection infrared camera parasitic light.
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| CN103063312A (en) * | 2012-12-29 | 2013-04-24 | 南京理工大学 | Measuring system and method for measuring object emissivity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103063312A (en) * | 2012-12-29 | 2013-04-24 | 南京理工大学 | Measuring system and method for measuring object emissivity |
Non-Patent Citations (1)
| Title |
|---|
| 李岩等: "红外光学遥感器内杂散光和外杂散光的综合抑制研究", 《光学学报》, vol. 33, no. 9, 30 September 2013 (2013-09-30) * |
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Inventor after: Li Yan Inventor after: Ruan Ningjuan Inventor after: Su Yun Inventor after: Guo Chongling Inventor after: Wu Limin Inventor after: Zhao Haibo Inventor after: Hu Bin Inventor after: Zheng Guoxian Inventor after: Xiao Si Inventor before: Ruan Ningjuan Inventor before: Su Yun Inventor before: Guo Chongling Inventor before: Wu Limin Inventor before: Zhao Haibo Inventor before: Hu Bin Inventor before: Zheng Guoxian Inventor before: Xiao Si |
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