CN101144738A - Low temperature dewar cool platform support device for focal plane detector - Google Patents
Low temperature dewar cool platform support device for focal plane detector Download PDFInfo
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- CN101144738A CN101144738A CNA200710047622XA CN200710047622A CN101144738A CN 101144738 A CN101144738 A CN 101144738A CN A200710047622X A CNA200710047622X A CN A200710047622XA CN 200710047622 A CN200710047622 A CN 200710047622A CN 101144738 A CN101144738 A CN 101144738A
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Abstract
The invention discloses a supporting mechanism for a cooling platform of a cryostat of a focal plane detector. The supporting mechanism consists of a spindly thin wall cylindrical supporting column and four inclined pull type tinsels provided with prills on the two ends. The supporting column is arranged inside a boom-type casing of the cryostat, a cooling platform is supported by the supporting column fixed through weld, the four angles of the cooling platform are separately connected with tinsel, the connection between the tinsel and the cooling platform is spherical pair connection, and the other end of the tinsel is connected with an active and fixing column screwed on the side wall of a feed through collar in downward and inclined pull type and with spherical pair. The screwing screw is the screw for screwing the active and fixing column and the feed through collar, and is also the screw to load the pretightening force for the inclined type tinsel, and a screw cap for fixing the pretightening force is sleeved outside the screw. The invention has the advantages that the supporting mechanism overrides the abuse of the traditional cooling platform supporting structure on dynamics, and ensures that the detector is within the allowed error range of the optical system focal plane. The inclined pull type tinsel is connected with the active and fixing column and the cooling platform by adopting the spherical pair connection, when continuous outer impulsion and disturbance are received, the connecting part can be moved freely, and no fatigue bruising is created to cause breakage.
Description
Technical field
The present invention relates to the low-temperature metal Dewar, specifically be meant to be packaged in the supporting mechanism that the cold platform of infrared focal plane detector is installed in interior being used to of low-temperature metal Dewar.
Background technology
Super long alignment or super large face battle array infrared focal plane detector have following characteristics: 1) multi-chip module assembling; 2) for guaranteeing the reliability and the yield rate of detector, chip generally has the large tracts of land passive substrate that resisting temperature is impacted; 3) many optical elements (as optical filter) and support thereof; 4) improve detector performance in order to reduce ground unrest, adopt cold screen; 5) more function extension line substrate is arranged.These parts all are mounted on the cold platform, and are packaged in the Dewar, and this has mechanical strength preferably with regard to the supporting mechanism that requires cold platform, less leakage heat and less vacuum deflation.
The supporting mechanism of traditional cold platform adopts the support column of elongated thin walled cylindrical, when the cold platform load increases,, increase the walled thickness of support column often in order to reach certain mechanical strength, the increase of thickness can guarantee mechanical strength, but can cause the leakage heat of support column to increase.For reducing the leakage heat that the sectional area increase brings, the someone adopts the lower glass of coefficient of heat conductivity as the support column material.The support column material of patent us4918312 DewarColdfinger adopts plastics, has generated layer of metal in order to satisfy welding requirements on plastics, and we know that glass and plastic material exist fragility, venting rate height and the high shortcoming of gas permeability.What the support column among the patent us495810 Distortion Free Dewar/Coldfinger Assembler adopted is Titanium, though the strength ratio stainless steel of Titanium is good, but Titanium has the ability of very strong adsorbed gas, under vacuum state, its venting rate is than high two orders of magnitude of general stainless steel.These shortcomings are very disadvantageous to the Dewar vacuum life; Also the someone adopts the method that increases stiffening rib on support column.Stiffening rib is set no doubt can when guaranteeing mechanical strength, makes that heat improves with Louing, but bring difficulty to the machine work of support column.Above-mentioned which kind of structure no matter, all there is a very big drawback, that exactly when support column when being subjected to big acting force of X, Y direction or percussive action, the degree of disturbing of cold platform and pitch angle are relatively large, are difficult to guarantee that detector is positioned at the permissible error scope of optical system focal plane all the time.This is for the Dewar of encapsulation super long alignment or super large face battle array infrared focal plane detector, and it is more outstanding that problem seems.Must explore a kind of new construction and solve this problem.
Summary of the invention
Purpose of the present invention will provide a kind of supporting mechanism of resisting the cold platform of external force effect, especially X, Y directive effect power.This supporting mechanism has in the low-temperature metal Dewar and leaks that heat is little, the venting rate is low.
The object of the present invention is achieved like this, a kind of supporting mechanism of cold platform of the cooled cryostat that is used for infrared focal plane detector, described cooled cryostat is by cantilevered shell 1, and the outside weld suitable for reading of cantilevered shell is connected to a feed-through collar 2, and the cap 4 of sealing one band window 3 is formed on the feed-through collar.Described supporting mechanism is made up of the support column 5 of elongated thin walled cylindrical, the tinsel 7 and the movable fixed column 10 of four cable-stayed type two end band prills 6.Support column 5 places in the cantilevered shell of Dewar, and pass the middle circular hole of feed-through collar, and exceeding feed-through collar 6mm-9mm, support column upper support one is by the fixing cold platform 8 of welding, place infrared focal plane detector 9 on the cold platform, window 3 is positioned at the top of cold platform.Respectively be linked with an one metal wire 7 at the place, four angles of cold platform or at angle less than four/one side strong point from cold platform, tinsel is that spherical pair connects with connecting of cold platform, and the downward cable-stayed type of the other end wiry connects with movable fixed column 10 spherical pairs that are screwed onto on the feed-through collar sidewall.Said its screw 11 that is spirally connected is the screw that is spirally connected of movable fixed column and feed-through collar, is again the screw that the cable-stayed type tinsel is loaded pretightning force, and screw is with the fixedly nut 12 of pretightning force outward.
Said support column, tinsel and prill superficial growth thereof have one deck to reduce the diaphragm of its venting rate.
Advantage of the present invention is as follows:
1. cold platform as its supporting mechanism, has overcome traditional cold platform supporting construction drawback on mechanics by support column and four cable-stayed type tinsels, guarantees that detector is positioned at the permissible error scope of optical system focal plane all the time.
2. adopted the tinsel slant-pull structure, less relatively surface area is arranged, that is to say less discharge quantity, this vacuum life to Dewar is very favourable.
3. tiltedly drawing metal adopts spherical pair to connect with movable fixed column and cold platform, and when being subjected to extraneous bump disturbance, the junction can free activity, can not produce tired hard defects and ruptures.
4. support column, tinsel and prill superficial growth thereof have one deck to reduce the diaphragm of its venting rate, help Dewar and obtain longer vacuum life.
Description of drawings
Fig. 1 is a cold platform supporting construction synoptic diagram of the present invention;
Fig. 2 is the partial enlarged drawing that oblique drawing metal and movable fixed column among Fig. 1 and cold platform connect;
Fig. 3 is the cold platform structural representation.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail:
The tinsel 7 and the movable fixed column 10 of two end band prills 6 of support column of the present invention 5, four cable-stayed types all adopt TC4 alloy (Ti-6A1-4V) material, titanium alloy TC 4 is compared with the stainless steel that tradition is used always, its density and coefficient of heat conductivity are low approximately by 1/2, and physical strength has improved 3 times.But also there is a significant disadvantages in it, and that is exactly under identical condition, and the venting rate is than high two orders of magnitude of stainless steel.Therefore the present invention adopts and generates the TiN of a layer thickness greater than 9 μ m at the titanium alloy TC 4 material surface.Concrete growth conditions is: in vacuum drying oven, the support column that processes, tinsel and the movable fixed column that connects prill are heated to 900 ℃, 1.01 * 10
5In the Pa high pure nitrogen atmosphere, be incubated 2 hours.
The welding of cold platform and support column, four cable-stayed type tinsel and connections of bead and the welding of whole metal Dewar all adopt the airtight soldering of high vacuum to be connected.
The place, four angles of cold platform 8, have a notched ball-and-socket 801, in order to consider the convenience of infrared focal plane detector signal extension line, four angles can be departed from the position of ball-and-socket, but consider that the oblique wire drawing of metal stablizes role to cold platform, therefore, the angle that cold platform is left in the position of ball-and-socket be less than its position the length of side 1/4th, and four ball-and-socket position symmetries.
The installation of the supporting mechanism of cold platform
At first an end of the tinsel 7 of four two ends band beads is installed in four ball-and-socket 8-1 places of cold platform respectively, tinsel is drawn from the breach of ball-and-socket, the other end is installed in the ball-and-socket 10-1 place of movable fixed column 10, again with movable fixed column by on the uniform sidewall that is installed in feed-through collar 4 of screw 11, apply the pretightning force of 5N for tight fourth screw 11 by torque spanner.At last retainer nut 12 is installed on the holding screw 11.Finished the assembling of cold platform mechanics reinforcement supporting mechanism.
The present invention is successfully applied to long alignment infrared focus plane and surveys Dewar component.The diameter of titanium wire drawing is φ 0.6mm, and length is 16.5mm, and the support column wall thickness is 0.15mm.Below the Dewar component after installing has been carried out mechanics and air-tight test:
1. mechanical strength
The present invention has passed through mechanical shock, random vibration, sinusoidal vibration, acceleration test and high and low temperature impact test, does not compare before testing back each performance index of Dewar component and testing to change.
2. impermeability
Randomly draw the high/low-temperature impact that five samples have carried out 77K and room temperature, temperature rate was less than 5 minutes.The leak rate situation sees the following form before and after the test:
| |
1 | 2 | 3 | 4 | 5 |
| Leak rate before impacting (torr. liter/second) | 8.1×10 -12 | 2.1×10 -12 | 3.4×10 -12 | 1.4×10 -12 | 1.4×10 -12 |
| Leak rate after impacting (torr. liter/second) | 5.1×10 -12 | 3.1×10 -12 | 6.4×10 -12 | 2.4×10 -12 | 2.0×10 -12 |
Claims (3)
1. the supporting mechanism of the cold platform of a cooled cryostat that is used for infrared focal plane detector, described cooled cryostat is by cantilevered shell (1), the outside weld suitable for reading of cantilevered shell is connected to a feed-through collar (2), and the cap (4) of sealing one band window (3) is formed on the feed-through collar, it is characterized in that:
Described supporting mechanism is made up of the support column (5) of elongated thin walled cylindrical, the tinsel (7) and the movable fixed column (10) of four cable-stayed type two end band prills (6);
Support column (5) places in the cantilevered shell of Dewar, and pass the middle circular hole of feed-through collar (2), and exceeding feed-through collar 6mm-9mm, support column upper support one is by the fixing cold platform (8) of welding, place infrared focal plane detector (9) on the cold platform, window (3) is positioned at the cold platform top; Respectively be linked with an one metal wire (7) at the place, four angles of cold platform or at angle less than four/one side strong point from cold platform, tinsel is that spherical pair connects with connecting of cold platform, and downward cable-stayed type of the other end wiry and uniform movable fixed column (10) spherical pair that is screwed onto on the feed-through collar sidewall connect; Said its screw (11) that is spirally connected is the screw that is spirally connected of movable fixed column and feed-through collar, is again the screw that the cable-stayed type tinsel is loaded pretightning force, and screw is with the fixedly nut of pretightning force (12) outward.
2. be used for the supporting mechanism of cold platform of the cooled cryostat of infrared focal plane detector according to claim 1 a kind of, it is characterized in that: the tinsel (7) and the movable fixed column (10) of said support column (5), two end band prills (6) all adopt the TC4 titanium alloy material.
3. be used for the supporting mechanism of cold platform of the cooled cryostat of infrared focal plane detector according to claim 1 a kind of, it is characterized in that: the tinsel (7) and movable fixed column (10) superficial growth of said support column (5), two end band prills have one deck to reduce the TiN diaphragm of its venting rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710047622XA CN101144738A (en) | 2007-10-31 | 2007-10-31 | Low temperature dewar cool platform support device for focal plane detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710047622XA CN101144738A (en) | 2007-10-31 | 2007-10-31 | Low temperature dewar cool platform support device for focal plane detector |
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| CN101144738A true CN101144738A (en) | 2008-03-19 |
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| CNA200710047622XA Pending CN101144738A (en) | 2007-10-31 | 2007-10-31 | Low temperature dewar cool platform support device for focal plane detector |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100541775C (en) * | 2008-06-12 | 2009-09-16 | 中国科学院上海技术物理研究所 | Pin configuration between a kind of low temperature cold platform and the room temperature outer housing and method |
| CN101408461B (en) * | 2008-11-26 | 2010-06-09 | 中国科学院上海技术物理研究所 | Exhausting device for testing performance of infrared detector minitype Dewar component |
| CN103048052A (en) * | 2013-01-05 | 2013-04-17 | 昆明物理研究所 | Miniature metal Dewar inner tube for guidance |
| CN103168217A (en) * | 2010-10-14 | 2013-06-19 | 半导体器件-埃尔法特系统-拉法合伙公司 | Dewar assembly for IR detection systems |
| CN104731126A (en) * | 2015-01-21 | 2015-06-24 | 中国科学院上海技术物理研究所 | Temperature control method based on integrated Dewar component temperature change testing refrigeration structure |
| CN103344342B (en) * | 2013-06-21 | 2015-07-29 | 中国科学院上海技术物理研究所 | The cold platform supporting construction of a kind of anti-radial vibration and impact |
| CN105928623A (en) * | 2016-04-08 | 2016-09-07 | 北京航天计量测试技术研究所 | Flexible auxiliary supporting mechanism of dewar of refrigeration type infrared detector |
| CN108386656A (en) * | 2018-03-13 | 2018-08-10 | 北京卫星环境工程研究所 | Leakage temperature barrier and method for ultralow temperature cold plate |
| CN108955899A (en) * | 2018-07-24 | 2018-12-07 | 中国电子科技集团公司第十研究所 | Infrared detector Dewar and detector assembly |
| CN109655165A (en) * | 2019-01-10 | 2019-04-19 | 中国科学院上海技术物理研究所 | Integrated encapsulation structure for inhibiting refrigeration working medium to influence infrared detector noise |
| CN110779628A (en) * | 2019-09-23 | 2020-02-11 | 北京空间机电研究所 | Large-area-array infrared focal plane Dewar cold finger supporting structure with high heat resistance and high rigidity |
| CN112414560A (en) * | 2020-10-12 | 2021-02-26 | 中国电子科技集团公司第十一研究所 | Cold head supporting structure |
| CN112504475A (en) * | 2020-10-23 | 2021-03-16 | 中国电子科技集团公司第十一研究所 | Infrared detector |
-
2007
- 2007-10-31 CN CNA200710047622XA patent/CN101144738A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100541775C (en) * | 2008-06-12 | 2009-09-16 | 中国科学院上海技术物理研究所 | Pin configuration between a kind of low temperature cold platform and the room temperature outer housing and method |
| CN101408461B (en) * | 2008-11-26 | 2010-06-09 | 中国科学院上海技术物理研究所 | Exhausting device for testing performance of infrared detector minitype Dewar component |
| CN103168217A (en) * | 2010-10-14 | 2013-06-19 | 半导体器件-埃尔法特系统-拉法合伙公司 | Dewar assembly for IR detection systems |
| CN103168217B (en) * | 2010-10-14 | 2015-01-14 | 半导体器件-埃尔法特系统-拉法合伙公司 | Dewar assembly for IR detection systems |
| CN103048052A (en) * | 2013-01-05 | 2013-04-17 | 昆明物理研究所 | Miniature metal Dewar inner tube for guidance |
| CN103344342B (en) * | 2013-06-21 | 2015-07-29 | 中国科学院上海技术物理研究所 | The cold platform supporting construction of a kind of anti-radial vibration and impact |
| CN104731126A (en) * | 2015-01-21 | 2015-06-24 | 中国科学院上海技术物理研究所 | Temperature control method based on integrated Dewar component temperature change testing refrigeration structure |
| CN105928623B (en) * | 2016-04-08 | 2019-02-01 | 北京航天计量测试技术研究所 | A kind of flexible auxiliary support mechanism of refrigeration type infrared detector Dewar |
| CN105928623A (en) * | 2016-04-08 | 2016-09-07 | 北京航天计量测试技术研究所 | Flexible auxiliary supporting mechanism of dewar of refrigeration type infrared detector |
| CN108386656A (en) * | 2018-03-13 | 2018-08-10 | 北京卫星环境工程研究所 | Leakage temperature barrier and method for ultralow temperature cold plate |
| CN108955899A (en) * | 2018-07-24 | 2018-12-07 | 中国电子科技集团公司第十研究所 | Infrared detector Dewar and detector assembly |
| CN109655165A (en) * | 2019-01-10 | 2019-04-19 | 中国科学院上海技术物理研究所 | Integrated encapsulation structure for inhibiting refrigeration working medium to influence infrared detector noise |
| CN110779628A (en) * | 2019-09-23 | 2020-02-11 | 北京空间机电研究所 | Large-area-array infrared focal plane Dewar cold finger supporting structure with high heat resistance and high rigidity |
| CN110779628B (en) * | 2019-09-23 | 2021-08-10 | 北京空间机电研究所 | Large-area-array infrared focal plane Dewar cold finger supporting structure with high heat resistance and high rigidity |
| CN112414560A (en) * | 2020-10-12 | 2021-02-26 | 中国电子科技集团公司第十一研究所 | Cold head supporting structure |
| CN112504475A (en) * | 2020-10-23 | 2021-03-16 | 中国电子科技集团公司第十一研究所 | Infrared detector |
| CN112504475B (en) * | 2020-10-23 | 2023-03-03 | 中国电子科技集团公司第十一研究所 | Infrared detector |
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