CN103983363A - Optimal refrigerating plate for low-temperature infrared target source - Google Patents
Optimal refrigerating plate for low-temperature infrared target source Download PDFInfo
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- CN103983363A CN103983363A CN201410234094.9A CN201410234094A CN103983363A CN 103983363 A CN103983363 A CN 103983363A CN 201410234094 A CN201410234094 A CN 201410234094A CN 103983363 A CN103983363 A CN 103983363A
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Abstract
The invention belongs to the technical field of the low temperature and infrared, and relates to an optimal refrigerating plate for a low-temperature infrared target source. The surface of the side, making contact with liquid nitrogen, of the refrigerating plate is provided with a groove (1), a liquid nitrogen inlet (2) and a liquid nitrogen outlet (3), the liquid nitrogen inlet (2) and the liquid nitrogen outlet (3) are located in the two sides of the groove (1) and communicated with the groove (1), the groove (1) is internally provided with a plurality of baffles (4) parallel to the left side wall and the right side wall of the groove (1), and the adjacent baffles (4) are arranged in a staggered mode to form a rotation gallery model. According to the designed refrigerating plate, the refrigerating time can be shortened to 1,260 s while the temperature evenness of a black body surface source is guaranteed, and cooling time is very short; the temperature fields of the black body surface source can be distributed very evenly, and the temperature evenness is smaller than 0.02 K; the temperature control range of the temperature changeable low-temperature infrared target source can reach to the temperature wide area from 80 K to 300 K.
Description
Technical field
The invention belongs to low temperature and infrared technique field, relate to a kind of test and demarcate the response linearity of low temperature infrared sensor and the cold plate model of heteropical crucial testing apparatus.
Background technology
Infrared technique and product are increasingly extensive in the application of the every field such as national defence, space flight, medical treatment, environmental engineering, resource exploration.What particularly the optical detection system in space industry adopted at present is mainly infrared optical system.Therefore, the quality of infrared sensor performance has directly affected signals collecting and the processing power in deep space probing.In order to test and the performance of calibration sensor, determine the funtcional relationship between output signal and the calibrated radiation source of detector in operating temperature range, and the target information inverting of obtaining in detection system flight course is obtained to spectral reflection characteristic and the spectral characteristics of radiation of this target, must apply the low temperature black matrix target source with virtual space infrared origin its linear response degree and heterogeneity are calibrated to correction.
At present the perform region temperature homogeneity in conventional black matrix face source is ± 0.5K, develops at present ripe low temperature black matrix target source and generally only can reach the low temperature of 220K.
Summary of the invention
The object of this invention is to provide the best cold plate in a kind of low temperature infrared target source, can control blackbody temperature variable between 80～300K, temperature homogeneity < 0.02K.
The object of the invention is to be achieved through the following technical solutions:
The best cold plate in a kind of low temperature infrared target source, for single-input single-output formula structure, cold plate contacts side surface with liquid nitrogen is provided with groove, liquid nitrogen entrance and liquid nitrogen outlet, the outlet of liquid nitrogen entrance and liquid nitrogen be positioned at the both sides of groove and be connected with groove, in described groove, be provided with the baffle plate that several are parallel to groove left and right sidewall, adjacent screen is staggered and forms revolution gallery type.
In the present invention, described liquid nitrogen entrance and liquid nitrogen outlet are positioned at the upper end of cold plate, can ensure that like this liquid nitrogen can fully contact the homogeneity that reaches refrigeration in each groove with cold plate.
Low temperature infrared target origin system is made up of black matrix, heating plate, three parts of cold plate, and described cold plate is for being with reeded cube structure, and the different structure of cold plate directly causes cooling time and the temperature homogeneity in black matrix face source.Cold plate structure of the present invention is single-input single-output formula model, liquid nitrogen flows into from the liquid nitrogen inlet side of cold plate, along the groove whole cold plate of flowing through, finally flow out in the liquid nitrogen exit of cold plate opposite side, the design of single-input single-output formula structure, can make cooling time greatly shorten, temperature homogeneity is greatly improved.
The present invention has the following advantages:
1, cold plate designed the present invention is used for to low temperature infrared target origin system, can make temperature-changeable low temperature infrared target source reach the temperature-control range of the wide warm area of 80K～300K, temperature range has had very large increase, for the detection of infrared sensor in low temperature environment provides the benchmark of calibrating, improve the accuracy of detector at Space-Work, ensured for the development and application of infrared eye provides reliable technical quality.
2, material of the present invention is red copper, and red copper has good conduction, heat conduction, anti-corrosion and processing characteristics, can weld and soldering.
3, the designed cold plate model of the present invention can ensure the black matrix face inhomogeneity while of source temperature, and cooling time is reduced to 1260s, and temperature fall time is very short.
4, the designed cold plate model of the present invention can ensure that the temperature field distribution in black matrix face source is very even, temperature homogeneity < 0.02K.
5, use the low temperature infrared target origin system of the designed cold plate of the present invention not only can solve response linearity and heteropical test problems of low temperature infrared product (sensor), and met well the demarcation correction demand of space flight infrared detection system.
Brief description of the drawings
Fig. 1 is low temperature infrared target origin system structure diagram;
Fig. 2 is the structural representation of single-input single-output formula cold plate;
Fig. 3 is that the A-A of Fig. 2 is to view;
Fig. 4 is single-input single-output formula model structure figure;
Fig. 5 is single-input single-output formula cold plate entirety cloud atlas distribution plan;
Fig. 6 is cloud atlas distribution plan on single-input single-output formula black matrix face source;
Fig. 7 is single-input single-output formula temperature lowering curve figure;
Fig. 8 is drum type brake model structure figure;
Fig. 9 is drum type brake model cloud atlas distribution plan;
Figure 10 is drum type brake model black matrix face cloud atlas distribution plan;
Figure 11 is drum type brake model temperature lowering curve figure;
In figure, 1-vacuum tank; 2-liquid nitrogen container; 3-tank support; 4-liquid nitrogen import/export; 5-cold plate; 6-heating plate; 7-black matrix; 8-infrared window; 9-vacuum tank base; 10-vacuum unit.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described; but be not limited to this; every technical solution of the present invention is modified or is equal to replacement, and not departing from the spirit and scope of technical solution of the present invention, all should be encompassed in protection scope of the present invention.
According to the structural principle of the low temperature infrared target origin system of existing technical performance index requirement design as shown in Figure 1.Low temperature infrared target system is mainly made up of Low Temperature Target origin system, measuring and controlling temp system, vacuum system three parts.Low temperature infrared target origin system
Low Temperature Target origin system is as key and the core of low temperature infrared target system, and this structure is mainly made up of low temperature infrared target origin system and liquid nitrogen container etc., and described low temperature infrared target origin system is made up of black matrix, heating plate, three parts of cold plate.Cold plate provides even refrigeration heat sink for black matrix face source, and for the low temperature even temperature effect of obtain≤80K, system adopts liquid nitrogen (77K) large area direct-cooling type refrigeration modes.Heating plate provides homogeneous heating thermal source for black matrix face source.Temperature adjustment and the temperature control in black matrix face source, under the acting in conjunction of cold plate and heating plate, by regulating heating power (thermal source), are realized in black matrix face source.Then the radiation under different temperatures sees through infrared window and is delivered to infrared sensor, and infrared sensor is calibrated to correction.For ensureing that black matrix face source has good temperature homogeneity and higher heat transfer efficiency, above-mentioned part all adopts the red copper material that pyroconductivity is higher to make.
For preventing that liquid nitrogen container Conduction At Low Temperature from causing leaking thermal phenomenon to vacuum tank and occurring, should avoid liquid nitrogen container directly to contact with vacuum tank.For this reason, liquid nitrogen container generally can adopt suspension type or wedge shape foot rest supporting way to install.Device system in the present invention adopts the wedge shape foot rest support that thermal insulation material is made to install fixing.
Core component of the present invention is low temperature extend blackbody cold plate model, and size is 250mm × 250mm, and thickness is 15mm.In order to improve the emissivity of this extend blackbody and to eliminate stray light, black-body surface is evenly distributed with the rectangular pyramid structure of certain angle, and scribbles low temperature black matrix paint.
In order to investigate the bulk temperature distribution situation in black matrix face source, generally adopt dimensionless characteristic number one to finish wet several B
ianalyze.Work as B
i, can think that black matrix bulk temperature is evenly distributed unanimously at≤0.1 o'clock.Finish wet several computing formula as follows:
Wherein, δ is black matrix thickness; H is surface film thermal conductance; λ is coefficient of heat conductivity.
(1) blackbody radiation affects Temperature Distribution
Black matrix face source thickness δ is 15mm; Black-body surface equivalent radiated power heat exchange thermal resistance 1/h size is taken as 3; λ=400W/mK.
Calculate B by (1) formula
i=1.125 × 10
-4.
Now B
i< < 0.1, therefore, the radiation heat transfer between black matrix and infrared window is minimum on the impact of blackbody temperature distributing homogeneity.
(2) impact of heat conduction on Temperature Distribution
Consider that at this blackbody temperature under refrigeration condition distributes.Now 1/h is heat conducting heat exchange thermal resistance between black matrix and heating plate, and size is taken as 0.1.
Calculate B by (1) formula
i=3.75 × 10
-6.
Equally, now B
i< < 0.1, therefore, the heat conduction between black matrix and heating plate is also minimum on the inhomogeneity impact of blackbody temperature.
From analyzing above, the black matrix bulk temperature under thermal equilibrium state is evenly distributed.
In the present invention design and sunykatuib analysis several models, by the comparative analysis of several cold plate models, obtain the model of cooling time and black matrix face source temperature homogeneity the best, highlight single-input single-output formula model structure here.
Existing known structural model is drum type brake model, and the cooling time of this structural model is oversize and temperature homogeneity is good not.The best model that has designed in the present invention cold plate structure is single-input single-output formula model.
In single-input single-output formula structural model, top side's body is black matrix face source, and middle square body is heating plate, and the square body of rear side is cold plate.Wherein: cold plate contacts side surface with liquid nitrogen is provided with groove 1, be provided with the baffle plate 4 that several are parallel to groove 1 left and right sidewall in described groove 1, adjacent screen 4 is staggered and forms revolution gallery type.On cold plate, baffle plate 4 width are 2mm, recess width is 10mm, and groove depth is 10mm, draws two conduits on cold plate top, respectively liquid nitrogen entrance 2 and liquid nitrogen outlet 3, liquid nitrogen is entered by the import of cavity, is full of cavity, then is discharged by outlet, liquid nitrogen contacts with the cold plate in cavity, for black matrix provides low-temperature receiver.Single-input single-output formula model makes liquid nitrogen flow into from the groove of left side liquid nitrogen entrance 2, after flowing to bottom, flow into next-door neighbour's right groove, after flowing to top, in next-door neighbour's right groove, flow into again, and so forth, liquid nitrogen stream, through whole cold plate, finally exports 3 from the liquid nitrogen on right side and flows out, and in the groove of liquid nitrogen on cold plate, flows along a direction, refrigeration can be more even, and its structure as in Figure 2-4.In this model, the material of all parts is all the red copper that heat conductivility is good.The initial temperature that model is set is room temperature 300K, and be 1260s analysis time, and time step 20s carries out transient analysis (Transient) to this process.
Cloud atlas from Fig. 5-6 distributes, and there are three Temperature Distribution in the black matrix face source of this model, distributes in the form of a ring as the center of circle taking black matrix Mian Yuan center, and four angle red area temperature are up to 79.893K, and central area, face source temperature is minimum is 79.8706K.The temperature difference of this black matrix face source temperature field is 0.0224K, in actual application, actual needs be the radiating surface of a diameter Ф=250mm, by analysis calculate, practical application only have orange areas and yellow area, therefore the temperature difference in two regions is 0.0112K.In this model process of refrigerastion, liquid nitrogen is very even with contacting of cold plate, and cooling-down effect is fine, is distributed and can be found out that the temperature difference is less by cloud atlas.
Get three unique points on black matrix face source, provide temperature temporal evolution curve, as shown in Figure 7, in this curve map, TEMP2 is the central point of face source yellow area, and TEM3 is the unique point of face source orange areas, and TEMP4 is the unique point of face source red area.From this curve, 1260s moment black matrix face source temperature can reach balance, and equilibration time is very fast, and now the temperature of these three unique points is respectively 79.8706K, 79.8818K, 79.893K.
The cloud atlas of simply introducing rounding cartridge type model below distributes and temperature lowering curve, as shown in Fig. 8-11.Two kinds of cold plate model temperature fall times and temperature homogeneity contrast in table 1.
Two kinds of cold plate model temperature fall times of table 1 and temperature homogeneity contrast
| Parameter type | Drum type brake model | Single-input single-output formula model |
| Temperature fall time (s) | 3100 | 1260 |
| Temperature homogeneity (K) | 0.0232 | 0.0112 |
In two kinds of models to sum up analyzing, through can see the comparative analysis of temperature fall time and temperature homogeneity, to the blackbody radiation face cooling of equal size, in the identical situation of material, the homogeneity of temperature is best, temperature fall time is the fastest, and single-input single-output formula cooling model is optimization model.
As can be seen here, the present invention has adopted single-input single-output formula modelling structure, and then has improvement significantly for temperature homogeneity and cooling time.
(1) by the contrast of cold plate model, the temperature homogeneity that adopts single-input single-output formula model of the present invention to obtain can reach the precision of 0.0112K.
(2) the low temperature infrared target source cold plate model that utilizes the present invention to design, the recess width of cold plate model and barrier width and depth of groove are all the optimum dimensions under equivalent environment.
Claims (5)
1. the best cold plate in low temperature infrared target source, it is characterized in that described cold plate contacts side surface with liquid nitrogen is provided with groove (1), liquid nitrogen entrance (2) and liquid nitrogen outlet (3), liquid nitrogen entrance (2) and liquid nitrogen outlet (3) are positioned at the both sides of groove (1) and are connected with groove (1), in described groove (1), be provided with the baffle plate (4) that several are parallel to groove (1) left and right sidewall, adjacent screen (4) is staggered and forms revolution gallery type.
2. the best cold plate in low temperature infrared target according to claim 1 source, is characterized in that described liquid nitrogen entrance (2) and liquid nitrogen outlet (3) are positioned at the top of cold plate.
3. the best cold plate in low temperature infrared target according to claim 1 source, the width that it is characterized in that described baffle plate (4) is 2mm.
4. the best cold plate in low temperature infrared target according to claim 1 source, the width that it is characterized in that described groove (1) is 10mm, groove depth is 10mm.
5. the best cold plate in low temperature infrared target according to claim 1 source, the material that it is characterized in that described cold plate is red copper.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390346A (en) * | 2017-09-19 | 2017-11-24 | 北京仿真中心 | A kind of infrared field lens device of Low emissivity |
| CN111323136A (en) * | 2020-02-28 | 2020-06-23 | 中国科学院国家空间科学中心 | Liquid nitrogen refrigeration calibration cold source for microwave radiometer |
| CN112345083A (en) * | 2020-11-05 | 2021-02-09 | 南京工程学院 | High-temperature superconducting terahertz radiation source intelligent testing device based on different bias conditions |
Citations (1)
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| CN1912454A (en) * | 2005-06-17 | 2007-02-14 | 肖特股份公司 | Metal reflector and process for producing it |
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- 2014-05-29 CN CN201410234094.9A patent/CN103983363A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1912454A (en) * | 2005-06-17 | 2007-02-14 | 肖特股份公司 | Metal reflector and process for producing it |
Non-Patent Citations (1)
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| 王兆利，等: "低温面源黑体均温结构研究", 《真空与低温》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390346A (en) * | 2017-09-19 | 2017-11-24 | 北京仿真中心 | A kind of infrared field lens device of Low emissivity |
| CN111323136A (en) * | 2020-02-28 | 2020-06-23 | 中国科学院国家空间科学中心 | Liquid nitrogen refrigeration calibration cold source for microwave radiometer |
| CN112345083A (en) * | 2020-11-05 | 2021-02-09 | 南京工程学院 | High-temperature superconducting terahertz radiation source intelligent testing device based on different bias conditions |
| CN112345083B (en) * | 2020-11-05 | 2021-08-31 | 南京工程学院 | High-temperature superconducting terahertz radiation source intelligent testing device based on different bias conditions |
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