CN105043558A - Shielding method and apparatus for infrared radiation measurement of high-reflection surface - Google Patents
Shielding method and apparatus for infrared radiation measurement of high-reflection surface Download PDFInfo
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Abstract
The invention discloses a shielding method and apparatus for infrared radiation measurement of a high-reflection surface, for effectively ensuring the measuring accuracy. The shielding method comprises the steps of selection of a measurement orientation and a measurement device, arrangement of the size of a radiation shielding area, selection and assembling of a proper shielding device, installation of an infrared radiation measuring instrument, conduction of radiation measurement, correction of influences exerted by the shielding device itself on a measurement result and the like. According to the invention, by use of the open type radiation shielding apparatus, the influence exerted by environment radiation on the radiation measurement can be eliminated, the proportion of infrared radiation of the high-reflection surface itself in total radiation received by an infrared detector is substantially improved, and the measurement precision of the radiation of the high-reflection surface itself is improved.
Description
Technical field
The present invention relates to body surface infrared radiation measurement technical field, especially relate to a kind of screen method for high reverse side infrared radiation measurement and device.
Background technology
During infrared radiation measurement, the infrared radiation of surrounding environment is very important interference source.The measurand of non-black-body always has the reflection potential of different size, and environment infrared radiation can enter infrared radiometer after measurand reflection.In the built-up radiation that infrared radiometer accepts, only some derives from self radiation of measurand, and environmental radiation is especially serious to high reverse side (the smooth object surface that infrared reflectivity is higher) infrared radiation measurement interference.The infrared reflectivity of measurand is higher and temperature is near or below surrounding enviroment time, environmental radiation can enter infrared radiometer through reflection at high reverse side, and the built-up radiation that infrared radiometer accepts may only have partly even sub-fraction to derive from self radiation.Common high reverse side has glass, pottery, metal, painted surface, smooth plastics surface etc.For a long time, be considered to inaccurate to the infrared radiation measurement of high reverse side, the infrared radiation measurement of high reverse side self is the blind area in infrared radiation measurement always.
In order to reduce the reflection interference of environment infrared radiation to measurand, people have employed two kinds of solutions.The first carries out overall cooled with liquid nitrogen to the periphery local environment of Infrared survey platform and vacuumizes, and significantly reduces environment self radiation intensity.The German National metering high precision infrared standard metering outfit of institute and the vacuum infrared temperature standard equipment (VRTSF) of China National Measuring Science Research Inst., all adopt overall liquid nitrogen refrigerating and vacuum environment design, represent the forward position level of high precision infrared radiation measurement aspect.The overall liquid nitrogen refrigerating of test platform and vacuumize design, cost is extremely high, poor universality and be difficult to be applied to outdoor environment, and most of experiment porch cannot adopt this scheme.First scheme is that environment heat radiation is equivalent to a black matrix homogeneous radiation, is eliminated the environmental radiation of reflection by mathematics correction model.Actual environment comprises various non-homogeneous environment radiation, and the radiation profiles that the method cannot carry out object is measured, and can only be applied to spot measurement and error is larger.
Environmental radiation is the infrared imaging temperature measuring of high reverse side to the reflection interference of high reverse side exemplary.Because the reflectivity of high reverse side is high, emissivity is low, surface temperature be less than or close to environment temperature time, infrared heat image instrument measuring height reverse side accept infrared radiation in only have sub-fraction be surface self heat radiation.High reverse side is regarded as the blind area in infrared imaging temperature measuring always.The infrared imaging temperature measuring of high reverse side, at present mainly through means such as surface coverage coating, adhesive tapes, forms the unrestrained red dog in local at high reverse side.Infrared heat image instrument measuring overflows grey surface temperature and reacts temperature herein.Coating or adhesive tape can affect the performance of high reverse side and former Temperature Distribution field, can only measure interested several point.Some high reverse side (such as optical glass etc.) limit by performance requirement, are difficult in its surface coverage coating or adhesive tape.Self infrared intensity of direct high-acruracy survey height reverse side, needs a difficult problem for solution badly when being and at present carrying out temperature survey in electric inspection process, optical element and smooth object surface etc.
Summary of the invention
Instant invention overcomes shortcoming of the prior art, provide that a kind of cost is low, highly versatile, easy to use and effectively can ensure the screen method for body surface infrared radiation measurement of measurement accuracy, present invention also offers a kind of shield assembly for the method simultaneously.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
For a screen method for high reverse side infrared radiation measurement, it comprises the following steps:
Step 1, based on high reverse side external form and actual measurement environment, provides suitable measurement orientation, i.e. the azimuth-range of the relatively high reverse side of infrared radiometer; According to emissivity and the temperature of high reverse side, assess himself infrared intensity, select suitable infrared radiometer, ensure that self radiation intensity of high reverse side is within the scope of the calibration of measuring instrument;
Step 2, according to physical dimension and the measurement orientation of high reverse side, provides shape and the size of required radiation-shielded areas; The size of radiation-shielded areas will ensure that the infrared radiation of environment can not enter infrared radiometer at high reverse side through mirror-reflection;
Step 3, according to shape and the size of shielding area, mosaic screen shielding apparatus; Shield assembly comprises base, and is vertically arranged at the cold drawing on base; Described cold drawing surrounds measurement zone; Described cold drawing has the cavity holding liquid nitrogen, this cavity is provided with liquid nitrogen inlet and pressure relief opening; Huyashi-chuuka (cold chinese-style noodles) adopts and makes through the metal material of the high thermal conductivity coefficient of blackening process, and the remaining surface of cold drawing is provided with heat-insulation layer; Huyashi-chuuka (cold chinese-style noodles) has higher infrared emittance and infrared radiation absorption rate, and environmental radiation can be suppressed to enter infrared radiometer through huyashi-chuuka (cold chinese-style noodles) and high reverse side secondary reflection;
Step 4, according to concrete infrared radiation measurement requirement, assessment Measuring Time, selects liquid nitrogen and the gas injection mode of cold drawing; If Measuring Time is long: select continuous air Injection mode, ensures lasting gas and blow to huyashi-chuuka (cold chinese-style noodles), prevent low temperature huyashi-chuuka (cold chinese-style noodles) from causing the water vapor condensation of air to become ice sheet; Liquid nitrogen injection mode also adopts continuous injection mode, prevents huyashi-chuuka (cold chinese-style noodles) from occurring larger temperature variation; If Measuring Time is shorter: select disposable liquid nitrogen injection mode, the nitrogen adopting liquid nitrogen to volatilize is as the antifrost gas of huyashi-chuuka (cold chinese-style noodles); Because huyashi-chuuka (cold chinese-style noodles) needs a period of time from frosting to ice sheet, when some is measured in short-term, antifrost gas can not be used;
Step 5, according to the measurement orientation of design, installation infrared radiation survey meter, measures the infrared radiation distribution of high reverse side; Primarily of self infrared radiation of high reverse side and huyashi-chuuka (cold chinese-style noodles), the reflected radiation two parts on its surface form in the radiation that infrared radiometer accepts; Generally, because coldface temperature is close to liquid nitrogen temperature, the radiation intensity of common high reverse side is about more than hundred times of huyashi-chuuka (cold chinese-style noodles).When high reverse side is full of measuring instrument visual field, the infrared radiation that infrared radiometer accepts can regard the infrared radiation of high reverse side self as;
Step 6, during high precision infrared radiation measurement, need to revise huyashi-chuuka (cold chinese-style noodles) infrared radiation to the impact of measuring, according to concrete shape and the orientation of high reverse side and shield assembly, provide huyashi-chuuka (cold chinese-style noodles) by calculating radiology to distribute in the reflected radiation of high reverse side, in radiation profiles image, deduct the reflected radiation of huyashi-chuuka (cold chinese-style noodles) at high reverse side, promote the actinometry precision of high reverse side further; Because the cavity holding liquid nitrogen adopts high thermal conductivity coefficient metal, the Temperature Distribution change of huyashi-chuuka (cold chinese-style noodles) is little, coldface temperature can be set to fixed value in numerical evaluation.
For realizing a device for screen method described above, it comprises base, and is vertically arranged at the cold drawing on base; Described cold drawing surrounds measurement zone; Described cold drawing has the cavity holding liquid nitrogen, this cavity is provided with liquid nitrogen inlet and pressure relief opening; The surface that described cold drawing closes on measurement zone is called huyashi-chuuka (cold chinese-style noodles), and huyashi-chuuka (cold chinese-style noodles) adopts and makes through the metal material of the high thermal conductivity coefficient of blackening process, and the remaining surface of cold drawing is provided with heat-insulation layer.
Preferably, the cavity holding gas is set in described base, this cavity is arranged gas inject mouth; Described base is provided with the gas port of the slit-shaped extended along cold drawing inside edge, sprays antifrost gas for the huyashi-chuuka (cold chinese-style noodles) to cold drawing.
Preferably, described base is spliced by multiple base unit block, and each base unit block has the cavity of accommodation gas and is interconnected.
Preferably, described cold drawing is spliced by multiple cold drawing cell block, and each cold drawing cell block all has the cavity holding liquid nitrogen, and cavity is provided with liquid nitrogen inlet and pressure relief opening.
Preferably, described cold drawing and base adopt and removably connect.
Preferably, described cold drawing at least vertically arranges two standpipes away from the surface of measurement zone, inserts pluggable inserted link in standpipe, and described base arranges the blind hole corresponding with standpipe; Described inserted link is through standpipe and stretch into the blind hole of base, realizes removably connecting of cold drawing and base.
Preferably, the pressure relief opening of described cold drawing upper cavity is connected with the gas inject mouth of base upper cavity by pipeline.
Compared with prior art, the present invention adopts open shielding environment radiation scheme, significantly can promote the ratio in the built-up radiation that self infrared radiation of high reverse side accepts at infrared radiometer, promote the actinometry precision of high reverse side.The integrated environment liquid nitrogen refrigerating extensively adopted with existing high precision Infrared survey is compared with vacuum technique, and tool of the present invention has the following advantages:
(1) huyashi-chuuka (cold chinese-style noodles) of low temperature, high emissivity not only reduces self infrared radiation, also eliminates environmental radiation enters infrared radiometer impact through huyashi-chuuka (cold chinese-style noodles) and high reverse side secondary reflection.In conjunction with antifrost design, achieve the open by design suppressing environment infrared radiation.
(2) relative to the integrated environment liquid nitrogen refrigerating and the vacuum pumping technology that suppress environment infrared radiation field at present, the present invention adopts open antivacuum design, considerably reduce cost and the technical difficulty of shielding environment infrared radiation, reduce the threshold carrying out infrared radiation shielding in the experiment of various Infrared survey.
(3) Modularized splice that shield assembly adopts designs, and improves versatility and the portability of product, improves the feasibility of various Infrared survey place application shield assembly.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the present invention when using.
Fig. 2 is the enlarged diagram of base unit block in Fig. 1.
Fig. 3 is the enlarged diagram of cold drawing cell block in Fig. 1.
Fig. 4 is the schematic cross-section of Fig. 3.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not paying other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
For a screen method for high reverse side infrared radiation measurement, it comprises the following steps:
Step 1, based on high reverse side external form and actual measurement environment, provides suitable measurement orientation, i.e. the azimuth-range of the relatively high reverse side of infrared radiometer; According to emissivity and the temperature of high reverse side, assess himself infrared intensity, select suitable infrared radiometer, ensure that self radiation intensity of high reverse side is within the scope of the calibration of measuring instrument;
Step 2, according to physical dimension and the measurement orientation of high reverse side, provides shape and the size of required radiation-shielded areas; The size of radiation-shielded areas will ensure that the infrared radiation of environment can not enter infrared radiometer at high reverse side through mirror-reflection;
Step 3, according to shape and the size of shielding area, mosaic screen shielding apparatus; Shield assembly comprises base, and is vertically arranged at the cold drawing on base; Described cold drawing surrounds measurement zone; Described cold drawing has the cavity holding liquid nitrogen, this cavity is provided with liquid nitrogen inlet and pressure relief opening; Huyashi-chuuka (cold chinese-style noodles) adopts and makes through the metal material of the high thermal conductivity coefficient of blackening process, and the remaining surface of cold drawing is provided with heat-insulation layer; Huyashi-chuuka (cold chinese-style noodles) has higher infrared emittance and infrared radiation absorption rate, and environmental radiation can be suppressed to enter infrared radiometer through huyashi-chuuka (cold chinese-style noodles) and high reverse side secondary reflection;
Step 4, according to concrete infrared radiation measurement requirement, assessment Measuring Time, selects liquid nitrogen and the gas injection mode of cold drawing; If Measuring Time is long: select continuous air Injection mode, ensures lasting gas and blow to huyashi-chuuka (cold chinese-style noodles), prevent low temperature huyashi-chuuka (cold chinese-style noodles) from causing the water vapor condensation of air to become ice sheet; Liquid nitrogen injection mode also adopts continuous injection mode, prevents huyashi-chuuka (cold chinese-style noodles) from occurring larger temperature variation; If Measuring Time is shorter: select disposable liquid nitrogen injection mode, the nitrogen adopting liquid nitrogen to volatilize is as the antifrost gas of huyashi-chuuka (cold chinese-style noodles); Because huyashi-chuuka (cold chinese-style noodles) needs a period of time from frosting to ice sheet, when some is measured in short-term, antifrost gas can not be used;
Step 5, according to the measurement orientation of design, installation infrared radiation survey meter, measures the infrared radiation distribution of high reverse side; Primarily of self infrared radiation of high reverse side and huyashi-chuuka (cold chinese-style noodles), the reflected radiation two parts on its surface form in the radiation that infrared radiometer accepts; Generally, because coldface temperature is close to liquid nitrogen temperature, the radiation intensity of common high reverse side is about more than hundred times of huyashi-chuuka (cold chinese-style noodles).When high reverse side is full of measuring instrument visual field, the infrared radiation that infrared radiometer accepts can regard the infrared radiation of high reverse side self as;
Step 6, during high precision infrared radiation measurement, need to revise huyashi-chuuka (cold chinese-style noodles) infrared radiation to the impact of measuring, according to concrete shape and the orientation of high reverse side and shield assembly, provide huyashi-chuuka (cold chinese-style noodles) by calculating radiology to distribute in the reflected radiation of high reverse side, in radiation profiles image, deduct the reflected radiation of huyashi-chuuka (cold chinese-style noodles) at high reverse side, promote the actinometry precision of high reverse side further; Because the cavity holding liquid nitrogen adopts high thermal conductivity coefficient metal, the Temperature Distribution change of huyashi-chuuka (cold chinese-style noodles) is little, coldface temperature can be set to fixed value in numerical evaluation.
For realizing the shield assembly of above-mentioned screen method shown in Fig. 1-4, in figure, 10 is infrared imaging temperature measuring instrument, and 20 for having the testee of high reverse side.Shield assembly of the present invention comprises base 1, and is vertically arranged at the cold drawing 2 on base 1; The cold drawing of the present embodiment is made up of three pieces of flat boards, and three pieces of flat boards surround measurement zone; Obviously, cold drawing 2 can also be other suitable shapes, can need reasonably select the shape of cold drawing 2 according to measuring; Described cold drawing 2 has the cavity holding liquid nitrogen, this cavity is provided with liquid nitrogen inlet 21 and pressure relief opening 22; The surface 23 that described cold drawing 2 upper cavity closes on measurement zone is called huyashi-chuuka (cold chinese-style noodles), and huyashi-chuuka (cold chinese-style noodles) adopts and makes through the metal material of the high thermal conductivity coefficient of blackening process, and cold drawing 2 remaining surface 24 is provided with heat-insulation layer.
Wherein, the cavity holding gas is set in described base 1, this cavity is arranged gas inject mouth 11; Described base 1 is provided with the gas port 12 of the slit-shaped extended along cold drawing 2 inside edge, spray antifrost gas for the surface 23 closing on measurement zone to cold drawing 2, antifrost gas can be oxygen or nitrogen.
As further improvement, described base 1 is spliced by multiple base unit block, and each base unit block has the cavity of accommodation gas and is interconnected.Described cold drawing 2 is spliced by multiple cold drawing cell block, and each cold drawing cell block all has the cavity holding liquid nitrogen, and cavity is provided with liquid nitrogen inlet 21 and pressure relief opening 22.Cold drawing cell block in the present embodiment preferably adopts eight pieces.
Wherein, described cold drawing 2 vertically arranges two standpipes 3 away from the surface of measurement zone, inserts pluggable inserted link 4 in standpipe 3, and described base 1 arranges the blind hole 13 corresponding with standpipe 3; Described inserted link 4 is through standpipe 3 and stretch into the blind hole 13 of base 1, realizes removably connecting of cold drawing 2 and base 1.Obviously can also be the form that removably connects that clamping etc. is commonly used.
As further improvement, the pressure relief opening 22 of described cold drawing 2 upper cavity is connected by the gas inject mouth 11 of pipeline (not shown) with base 1 upper cavity, realizes the further utilization after liquid nitrogen gasification.
Assembling use procedure is as follows:
Step 1: according to the actual requirement of infrared radiation measurement, calculates the area of space of required shielding, builds the base of shield assembly.Based on the shape of base, carry out the assembled of base unit block, the internal cavity realizing each base unit block is communicated with, and reserves gas inject mouth.Gas cylinder is connected to the total interface of injection of base and injecting gas, and the gas port of the slit-shaped of each base unit block can eject one deck air-flow being close to huyashi-chuuka (cold chinese-style noodles).
Step 2: calculate according to radiation-shielded areas, the inserted link of assembled specified altitude assignment on each base unit block.Based on mounted base and inserted link, assembled cold drawing cell block.Each cold drawing cell block has the cavity holding liquid nitrogen, realizes huyashi-chuuka (cold chinese-style noodles) and is in low-temperature condition.Huyashi-chuuka (cold chinese-style noodles) has higher infrared radiation absorption rate, and there is fixing structure at cold drawing back, forms an entirety by inserted link and base.
Step 3: cold drawing is assembled complete after, by multiple-pass joint, the liquid nitrogen inlet of each cold drawing cell block is converged, draws a total liquid nitrogen inlet.Adopt multiple-pass joint that the pressure relief opening of cold drawing cell block is converged, draw a total pressure relief opening.
Step 4: adopt liquid nitrogen pump and liquid nitrogen container, injects liquid nitrogen to the cavity of each cold drawing by total liquid nitrogen inlet.The liquid nitrogen inlet of each cold drawing cell block installs flowrate control valve, for the liquid nitrogen flow velocity of control flow check to each cold drawing cell block.The huyashi-chuuka (cold chinese-style noodles) of each cold drawing cell block has different thermal environment borders, and the difference of the aspects such as such as wind speed, solar irradiance, temperature, the liquid nitrogen evaporation rate of each cold drawing cell block can be different.By regulating the liquid nitrogen of each cold drawing cell block to inject flow velocity, the liquid nitrogen total amount that can realize in each cold drawing cell block cavity is equal, and the liquid nitrogen refrigerating realizing each cold drawing cell block is in stable state substantially.
Cavity cold drawing cell block holding liquid nitrogen adopts high thermal conductivity coefficient metal material, the fluctuations of amount of liquid nitrogen, the coldface temperature caused rise and fall and thermograde less.Overwhelming majority infrared radiation measurement platform, on cold drawing, the temperature of huyashi-chuuka (cold chinese-style noodles) is lower, infrared radiation absorption rate is higher, and radiation screening effect is better.When cold drawing is in the low-temperature condition of liquid nitrogen refrigerating, the temperature fluctuation of huyashi-chuuka (cold chinese-style noodles) and gradient affect more weak on radiation shield performance.Consider that the price of liquid nitrogen pump and liquid nitrogen flow by-pass valve control is higher, liquid nitrogen injection mode can adopt and substitute from supercharging liquid nitrogen container: export from the liquid nitrogen of supercharging liquid nitrogen container and have flow regulating function, can control the liquid nitrogen flow velocity of total inlet.The thermal environment difference of each cold drawing cell block is faint, liquid nitrogen evaporation rate difference is little, the amount of liquid nitrogen in each cavity is totally in steady state (SS) to regulate overall flow rate to ensure in actual environment, and when the volatilization of some cold drawing cell block is slower, unnecessary liquid nitrogen flows out by pressure relief opening.
Step 5: after liquid nitrogen injection device starts, the temperature of huyashi-chuuka (cold chinese-style noodles) is extremely low, and the water vapor in superficial air can condense into frost on huyashi-chuuka (cold chinese-style noodles).After a period of time, along with increasing of frosting degree, huyashi-chuuka (cold chinese-style noodles) engenders ice sheet.The infrared radiation reflectivity of ice sheet is higher, and a part of environmental radiation can enter infrared radiometer after ice sheet and high reverse side secondary reflection.
Huyashi-chuuka (cold chinese-style noodles) directly contacts outside air, though coldface temperature is far below temperature, higher than the melting temperature of nitrogen and oxygen.The gas port of the slit-shaped of base upwards can spray nitrogen or oxygen flow forms air knife, air knife impacts huyashi-chuuka (cold chinese-style noodles) and in its surface square one-tenth there is certain thickness protect gas reservoir.Gas-bearing formation effectively can suppress the contact of water vapor and low temperature huyashi-chuuka (cold chinese-style noodles).Nitrogen, oxygen belong to symmetry molecule, do not cause galvanic couple level square to change, neither absorb also do not launch infrared radiation during molecular vibration.Low temperature huyashi-chuuka (cold chinese-style noodles) only has nitrogen and oxygen that melting point is extremely low, avoid huyashi-chuuka (cold chinese-style noodles) icing phenomenon.If Infrared survey platform is open environment, can only select nitrogen or a kind of gas of oxygen as protection gas; If platform is positioned at indoor enclosed environment, then need nitrogen, oxygen mixed gas, and in two kinds of gas ratios and air, both ratios are close, ensure that shield assembly can in indoor long-time running.
In fact, except some long-term infrared experiment porchs, the measurement used time of a lot of infrared radiation is very short.The cost of the devices such as the gas port on base and liquid nitrogen filling system is high, installation difficulty large, can adopt the shield assembly simplifying version for the infrared radiation measurement that the used time is shorter.Shield assembly can be reduced to need not any pipeline, fills liquid nitrogen rear enclosed liquid nitrogen inlet, and installing pressure relief valve at pressure relief opening can use.All there is heat-insulation layer in another five faces of cold drawing, after filling liquid nitrogen, can huyashi-chuuka (cold chinese-style noodles) be kept to be in low-temperature condition within the time of one relatively long in the cavity of cold drawing.Because Measuring Time is shorter, huyashi-chuuka (cold chinese-style noodles) can not form ice sheet.Another kind of simplification device is that pressure relief opening is directly connected with air Injection mouth, and the nitrogen volatilized by liquid nitrogen washes away huyashi-chuuka (cold chinese-style noodles), suppresses the frosting of huyashi-chuuka (cold chinese-style noodles).
Under normal temperature, when the various smooth object height reverse side such as simple glass, ceramic tile, galvanized sheet, painted surface, plain metal surface carry out infrared radiation imaging measurement, the reflected radiation of surrounding enviroment on its surface can reach the several times of self radiation intensity of high reverse side, clearly can see the catoptric imaging of Environmental Heat Source on its surface in infrared imaging.At present thermal infrared imager thermometric calibration lower limit on the market can reach-60 DEG C, can Measurement accuracy emissivity be the radiation intensity of more than 0.15 normal temperature height reverse side.In fact the high reverse side radiation intensity of major part is within the scope of thermal imaging system calibration, directly can measure its infrared radiation.The reflected radiation of environment on its surface is disturbed, and largely reducing the credibility of high reverse side infrared radiation measurement.The shielding area of environment infrared radiation is limited to the region that can enter infrared radiometer through the accurate mirror-reflection of high reverse side by the present invention, adopt low temperature and emissivity higher huyashi-chuuka (cold chinese-style noodles) shielding all infrared radiations entering infrared radiometer by mirror-reflection, substantially increase the ratio in total infrared radiation that self infrared radiation of high reverse side accepts at infrared radiometer, effectively promote infrared radiation measurement precision.
The present invention is close to the certain thickness air knife design of huyashi-chuuka (cold chinese-style noodles) by the ejection of slit-shaped gas port, utilizes nitrogen, characteristic that oxygen has low melting point temperature, prevents water vapor from freezing at huyashi-chuuka (cold chinese-style noodles).Major part infrared radiation measurement, its measurand and infrared radiometer close together, the air infrared radiation in measuring route can be ignored completely.The vacuum design that high precision infrared measurement equipment adopts has increased substantially equipment cost.Device therefor of the present invention is relatively simple and easy to get, and design difficulty of processing is little, cost is low, and the assembled convenience of modular design, can be applicable to accurately measuring of the various high reverse side infrared radiation in indoor and outdoor.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1., for a screen method for high reverse side infrared radiation measurement, it is characterized in that comprising the following steps:
Step 1, based on high reverse side external form and actual measurement environment, provides suitable measurement orientation, i.e. the azimuth-range of the relatively high reverse side of infrared radiometer; According to emissivity and the temperature of high reverse side, assess himself infrared intensity, select suitable infrared radiometer, ensure that self radiation intensity of high reverse side is within the scope of the calibration of measuring instrument;
Step 2, according to physical dimension and the measurement orientation of high reverse side, provides shape and the size of required radiation-shielded areas; The size of radiation-shielded areas will ensure that the infrared radiation of environment can not enter infrared radiometer at high reverse side through mirror-reflection;
Step 3, according to shape and the size of shielding area, mosaic screen shielding apparatus; Shield assembly comprises base, and is vertically arranged at the cold drawing on base; Described cold drawing surrounds measurement zone; Described cold drawing has the cavity holding liquid nitrogen, this cavity is provided with liquid nitrogen inlet and pressure relief opening; Huyashi-chuuka (cold chinese-style noodles) adopts and makes through the metal material of the high thermal conductivity coefficient of blackening process, and the remaining surface of cold drawing is provided with heat-insulation layer; Huyashi-chuuka (cold chinese-style noodles) has higher infrared emittance and infrared radiation absorption rate, and environmental radiation can be suppressed to enter infrared radiometer through huyashi-chuuka (cold chinese-style noodles) and high reverse side secondary reflection;
Step 4, according to concrete infrared radiation measurement requirement, assessment Measuring Time, selects liquid nitrogen and the gas injection mode of cold drawing; If Measuring Time is long: select continuous air Injection mode, ensures lasting gas and blow to huyashi-chuuka (cold chinese-style noodles), prevent low temperature huyashi-chuuka (cold chinese-style noodles) from causing the water vapor condensation of air to become ice sheet; Liquid nitrogen injection mode also adopts continuous injection mode, prevents huyashi-chuuka (cold chinese-style noodles) from occurring larger temperature variation; If Measuring Time is shorter: select disposable liquid nitrogen injection mode, the nitrogen adopting liquid nitrogen to volatilize is as the antifrost gas of huyashi-chuuka (cold chinese-style noodles); Because huyashi-chuuka (cold chinese-style noodles) needs a period of time from frosting to ice sheet, when some is measured in short-term, antifrost gas can not be used;
Step 5, according to the measurement orientation of design, installation infrared radiation survey meter, measures the infrared radiation distribution of high reverse side; Primarily of self infrared radiation of high reverse side and huyashi-chuuka (cold chinese-style noodles), the reflected radiation two parts on its surface form in the radiation that infrared radiometer accepts; Generally, because coldface temperature is close to liquid nitrogen temperature, the radiation intensity of common high reverse side is about more than hundred times of huyashi-chuuka (cold chinese-style noodles); When high reverse side is full of measuring instrument visual field, the infrared radiation that infrared radiometer accepts can regard the infrared radiation of high reverse side self as;
Step 6, during high precision infrared radiation measurement, need to revise huyashi-chuuka (cold chinese-style noodles) infrared radiation to the impact of measuring, according to concrete shape and the orientation of high reverse side and shield assembly, provide huyashi-chuuka (cold chinese-style noodles) by calculating radiology to distribute in the reflected radiation of high reverse side, in radiation profiles image, deduct the reflected radiation of huyashi-chuuka (cold chinese-style noodles) at high reverse side, promote the actinometry precision of high reverse side further; Because the cavity holding liquid nitrogen adopts high thermal conductivity coefficient metal, the Temperature Distribution change of huyashi-chuuka (cold chinese-style noodles) is little, coldface temperature can be set to fixed value in numerical evaluation.
2. for realizing a device for screen method as claimed in claim 1, it is characterized in that: comprise base, and be vertically arranged at the cold drawing on base; Described cold drawing surrounds measurement zone; Described cold drawing has the cavity holding liquid nitrogen, this cavity is provided with liquid nitrogen inlet and pressure relief opening; The surface that described cold drawing closes on measurement zone is called huyashi-chuuka (cold chinese-style noodles), and huyashi-chuuka (cold chinese-style noodles) adopts and makes through the metal material of the high thermal conductivity coefficient of blackening process, and the remaining surface of cold drawing is provided with heat-insulation layer.
3. device according to claim 2, is characterized in that: arrange the cavity holding gas in described base, this cavity is arranged gas inject mouth; Described base is provided with the gas port of the slit-shaped extended along cold drawing inside edge, sprays antifrost gas for the huyashi-chuuka (cold chinese-style noodles) to cold drawing.
4. device according to claim 3, is characterized in that: described base is spliced by multiple base unit block, and each base unit block has the cavity of accommodation gas and is interconnected.
5. device according to claim 2, is characterized in that: described cold drawing is spliced by multiple cold drawing cell block, and each cold drawing cell block all has the cavity holding liquid nitrogen, and cavity is provided with liquid nitrogen inlet and pressure relief opening.
6. according to the arbitrary described device of claim 2-5, it is characterized in that: described cold drawing and base adopt and removably connect.
7. device according to claim 6, is characterized in that: described cold drawing at least vertically arranges two standpipes away from the surface of measurement zone, inserts pluggable inserted link in standpipe, and described base arranges the blind hole corresponding with standpipe; Described inserted link is through standpipe and stretch into the blind hole of base, realizes removably connecting of cold drawing and base.
8. the device according to claim 3 or 4, is characterized in that: the pressure relief opening of described cold drawing upper cavity is connected with the gas inject mouth of base upper cavity by pipeline.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN106706132A (en) * | 2016-12-05 | 2017-05-24 | 中国科学院云南天文台 | Infrared detecting device and method for target recognition in sea surface sun bright band |
| CN111637977A (en) * | 2020-05-08 | 2020-09-08 | 中国电子科技集团公司第十一研究所 | Automatic blackening device and blackening method for cold screen of infrared detector |
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| CN106706132A (en) * | 2016-12-05 | 2017-05-24 | 中国科学院云南天文台 | Infrared detecting device and method for target recognition in sea surface sun bright band |
| CN111637977A (en) * | 2020-05-08 | 2020-09-08 | 中国电子科技集团公司第十一研究所 | Automatic blackening device and blackening method for cold screen of infrared detector |
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| CN105043558B (en) | 2017-11-28 |
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