CN106546554B - Low-temperature measurement system of terahertz superconducting array imaging detector - Google Patents
Low-temperature measurement system of terahertz superconducting array imaging detector Download PDFInfo
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- CN106546554B CN106546554B CN201610936328.3A CN201610936328A CN106546554B CN 106546554 B CN106546554 B CN 106546554B CN 201610936328 A CN201610936328 A CN 201610936328A CN 106546554 B CN106546554 B CN 106546554B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 28
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 43
- 229920000271 Kevlar® Polymers 0.000 claims abstract description 13
- 239000004761 kevlar Substances 0.000 claims abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 11
- 239000010935 stainless steel Substances 0.000 description 11
- 238000001179 sorption measurement Methods 0.000 description 5
- 230000005347 demagnetization Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 241001093575 Alma Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a low-temperature measuring system of a terahertz superconducting array imaging detector, which mainly comprises a low-temperature measuring platform and a supporting piece, wherein the supporting piece adopts a Kevlar fixing wire to suspend and fix a connecting piece and the low-temperature measuring platform, and meanwhile, the supporting piece realizes high-strength fixation of the low-temperature measuring platform through a fixing wheel and a fastening piece. In the low-temperature measurement, the terahertz superconducting array imaging detector is directly arranged on a low-temperature measurement platform, and the low-temperature measurement platform is connected with the lowest cooling stage (0.3K) of the refrigerator through a thermal connection line (such as an oxygen-free copper wire). In addition, the support piece is directly fixed on the 4K cooling stage of the refrigerator, and the ultralow heat conduction of the Kevlar fixing line ensures effective thermal isolation between the low-temperature measuring platform and the 4K cooling stage of the refrigerator.
Description
Technical Field
the invention belongs to the field of low-temperature measurement, and particularly relates to a low-temperature measurement system of a terahertz superconducting array imaging detector.
Background
the terahertz wave band is a unique wave band for observing the background of cosmic microwaves, early remote celestial bodies, cold and dark celestial bodies and celestial bodies covered by dust. For this reason, a series of ground and space terahertz astronomical plans are internationally proposed and built, such as SMA and ALMA ground terahertz interference arrays, ground single-antenna terahertz telescopes such as APEX and ASTE, and Herschel and SOFIA space terahertz telescopes. In the terahertz astronomy plan except for the interference array, the array imaging detector is used as subjective equipment for imaging and patrolling in a terahertz waveband large-day area, and provides a patrolling and biographical database of the unique waveband for the research of planets, stars, galaxies and universities. In addition, the array imaging detector is matched with a two-dimensional spectrometer, and is a unique means for diagnosing the properties of a cosmic interplanetary medium and accurately measuring the red shift of a celestial body at a cosmic distance.
the array imaging detector is mainly based on an incoherent detector technology, and the terahertz waveband high-sensitivity incoherent detector technology mainly comprises a superconducting phase change edge detector and a superconducting dynamic inductance detector. The superconducting phase transition edge detector and the superconducting dynamic inductance detector both belong to low-temperature detectors, and both need to work in a sub-K temperature region (such as a 300mK temperature region or a lower temperature region) in order to realize high sensitivity.
The low-temperature refrigerator which can provide a 300mK temperature zone or a lower temperature zone at present mainly comprises a dilution refrigerator, an adsorption refrigerator and an adiabatic demagnetization refrigerator, and core devices of the low-temperature refrigerator are respectively a dilution refrigerator, an adsorption refrigerator or an adiabatic demagnetization refrigerator. All three refrigerators need to work at 4K basic temperature, and can be generally realized by pulse tube refrigeration, GM refrigeration or liquid helium refrigeration. In practical application, because the area of the lowest cooling stage (such as a 300mK cooling stage or a lower cooling stage) of a dilution refrigerator, an adsorption refrigerator and an adiabatic demagnetization refrigerator is generally small and the bearing weight is limited, it is difficult to directly mount the terahertz superconducting phase-change edge array imaging detector and the terahertz superconducting dynamic inductance array imaging detector. For example, adsorption chillers typically have a diameter of less than 5 cm at their lowest temperature stage and a maximum load weight of only 0.1 kg. For low-temperature measurement of terahertz superconducting phase transition edge array imaging detectors and terahertz superconducting dynamic inductance array imaging detectors, a common method is to support a large-area low-temperature measurement platform by using a stainless steel pipe, the low-temperature measurement platform is used for thermally connecting to the lowest low-temperature cooling stage of a refrigerator, and the stainless steel pipe is directly or indirectly fixed to a 4K cooling stage of the refrigerator (for example, directly fixed to the 4K cooling stage of the refrigerator or fixed to the second lowest low-temperature cooling stage of the refrigerator, and then fixed to the 4K cooling stage of the refrigerator in other ways). The 4K cooling stage of the refrigerator can bear large weight which can reach thousands of grams or even dozens of kilograms, and meanwhile, the mechanical strength of the stainless steel tube is high, so that the terahertz superconducting phase change edge array imaging detector and the terahertz superconducting dynamic inductance array imaging detector can be effectively borne and installed. However, there are problems with using stainless steel tubes to support large area cryogenic measurement platforms. For example, if the stainless steel tube is directly fixed to the 4K cooling stage of the refrigerator, the low-temperature heat leakage of the stainless steel tube will cause the temperature of the low-temperature measuring platform and the lowest cooling stage of the refrigerator to rise, and at the same time, the low-temperature heat leakage will also shorten the effective working time of the refrigerator (such as an adsorption refrigerator and an adiabatic demagnetization refrigerator). If the stainless steel pipe is fixed on the secondary low-temperature cooling stage (such as 1K cooling stage) of the refrigerator and then is fixed on the 4K cooling stage of the refrigerator in other ways, the heat load of the lowest low-temperature cooling stage of the refrigerator can be relatively reduced, but the structure of the whole low-temperature measuring system is very complex. Therefore, for the low-temperature measurement of the terahertz superconducting phase transition edge array imaging detector and the terahertz superconducting dynamic inductance array imaging detector, a low-temperature measurement system which is simple and compact in structure and easy to implement needs to be developed urgently.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a low-temperature measurement system of a terahertz superconducting array imaging detector.
In order to achieve the purpose, the invention adopts the following technical scheme:
A terahertz superconducting array imaging detector low-temperature measurement system is characterized by comprising:
the low-temperature measuring platform is used for mounting the terahertz superconducting array imaging detector;
The support piece is directly fixed on the 4K cooling stage of the refrigerator and used for supporting the low-temperature measuring platform;
the connecting piece is used for connecting the low-temperature measuring platform and the supporting piece;
The refrigerator 0.3K cooling stage is used for cooling the low-temperature measuring platform;
And the thermal connecting line is connected with the low-temperature measuring platform and the 0.3K cooling stage of the refrigerator.
in order to optimize the technical scheme, the specific measures adopted further comprise:
the low-temperature measuring platform is a hexagonal oxygen-free copper plate, the surface of the low-temperature measuring platform is plated with gold, and a threaded hole is reserved in the side face of the low-temperature measuring platform.
the number of the supporting pieces is three, the supporting pieces are connected with the low-temperature measuring platform through three connecting pieces respectively, and the supporting pieces are arranged around the side face of the low-temperature measuring platform at equal angular intervals.
The supporting piece comprises a supporting frame, a first fixed wheel, a second fixed wheel, a first fastener, a second fastener and a fixed line; the first fixed wheel, the second fixed wheel, the first fastener and the second fastener are respectively arranged at four corners of the supporting frame, wherein the first fixed wheel and the second fastener are arranged in a diagonal manner, and the second fixed wheel and the first fastener are arranged in a diagonal manner; the first fastener and the second fastener are used for locking the fixing line, one end of the fixing line is fixed on the first fastener, the other end of the fixing line sequentially bypasses the second fixing wheel and the first fixing wheel and is finally fixed on the second fastener, so that the fixing line forms a cross at the middle of the supporting frame, and the connecting piece is installed at the cross of the fixing line.
The side face of the connecting piece is provided with a wire groove matched with the crossed fixing wire, the connecting piece is suspended on the fixing wire through the wire groove and is fixed by coating STYCAST in the wire groove; and the connecting piece is also provided with a screw through hole which is matched with a threaded hole on the side surface of the low-temperature measuring platform.
The fixed line is a Kevlar fixed line.
The thermal connecting wire is an oxygen-free copper wire.
the invention has the beneficial effects that: the low-temperature measuring platform is suspended and fixed by adopting a supporting piece and a connecting piece, wherein the supporting piece realizes high-strength fixation of the low-temperature measuring platform by adopting a fixing line, a fixing wheel and a fastener; the three supporting pieces are used for fixing the low-temperature measuring platform at equiangular intervals, and meanwhile, the supporting pieces are fixed by using crossed fixing lines to ensure that the degrees of freedom of the low-temperature measuring platform in six directions are all restricted; the low-temperature measuring platform is suspended and fixed by the Kevlar fixing wire, the low-temperature heat conduction coefficient of the Kevlar fixing wire is low, the low-temperature measuring platform and a 4K cooling stage of a refrigerator can be effectively thermally isolated, and meanwhile, the Kevlar fixing wire is high in mechanical strength, bending-resistant and small in expansion coefficient, so that the mechanical strength and the working reliability of a system are effectively improved; an oxygen-free copper wire is adopted to connect the low-temperature measuring platform with the 0.3K cooling level of the refrigerator, the low-temperature heat conduction coefficient of the oxygen-free copper is high, and the effective cooling of the low-temperature measuring platform can be ensured.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
fig. 2 is a schematic structural view of the support member of the present invention.
The reference numbers are as follows: the device comprises a cryogenic measurement platform 1, a support member 2, a support frame 21, a first fixed wheel 22, a second fixed wheel 22 ', a first fastener 23, a second fastener 23', a fixed line 24, a connecting member 3, a screw through hole 31, a refrigerator 0.3K cooling stage 4 and a thermal connecting line 5.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the low-temperature measurement system of the terahertz superconducting array imaging detector comprises a low-temperature measurement platform 1, a support 2, a connecting piece 3, a refrigerator 0.3K cooling stage (lowest cooling stage) 4 and a thermal connecting line 5.
In the low-temperature measurement system, a low-temperature measurement platform 1 is a hexagonal oxygen-free copper plate with gold plated on the surface, and a terahertz superconducting phase transition edge array imaging detector and a terahertz superconducting dynamic inductance array imaging detector can be directly fixed on the low-temperature measurement platform 1 to realize low-temperature measurement. The low-temperature measuring platform 1 is connected with a 0.3K cooling stage 4 of the refrigerator through an oxygen-free copper thermal connecting wire 5, the low-temperature thermal conductivity coefficient of the oxygen-free copper is high, and effective cooling of the low-temperature measuring platform 1 is ensured. Threaded holes are reserved in the side face of the low-temperature measuring platform 1 and are connected with three supporting pieces 2 through three connecting pieces 3, and the supporting pieces 2 are arranged around the side face of the low-temperature measuring platform 1 at equal angular intervals and are fixed on a 4K cooling stage of the refrigerator.
With further reference to fig. 2, the support 2 comprises in particular a support frame 21, a first fixed wheel 22, a second fixed wheel 22 ', a first fastener 23, a second fastener 23' and a fixed wire 24. The first fixed wheel 22, the second fixed wheel 22 ', the first fastening piece 23 and the second fastening piece 23' are respectively arranged at four corners of the supporting frame 21, wherein the first fixed wheel 22 and the second fastening piece 23 'are arranged diagonally, and the second fixed wheel 22' and the first fastening piece 23 are arranged diagonally; the first fastening member 23 and the second fastening member 23 ' are used for locking the fixing wire 24, and one end of the fixing wire 24 is fixed on the first fastening member 23, and the other end of the fixing wire 24 sequentially passes around the second fixing wheel 22 ' and the first fixing wheel 22, and is finally fixed on the second fastening member 23 ', so that the fixing wire 24 forms a crisscross in the middle of the supporting frame 21. The connecting piece 3 is arranged at the intersection of the fixing lines 24, the side face of the connecting piece 3 is provided with a wire groove matched with the crossed fixing lines 24, the fixing lines 24 penetrate through the wire groove, then the connecting piece 3 and the low-temperature measuring platform 1 are suspended and fixed through the fixing wheel 22 and the fastening piece 23, STYCAST (heat-conducting epoxy resin adhesive) is coated in the wire groove for fixing, and the connecting piece 3 is further provided with screw through holes 31 matched with threaded holes in the side face of the low-temperature measuring platform 1. The support piece 2 is suspended and fixed with the connecting piece 3 by adopting the cross fixing lines 24, so that the degree of freedom of the low-temperature measuring platform 1 in six directions is restrained, the fixing lines 24 are Kevlar fixing lines, the coefficient of low-temperature heat conduction of the Kevlar fixing lines is low, thermal isolation between the low-temperature measuring platform 1 and a 4K cooling stage of the refrigerator is effectively realized, meanwhile, the mechanical strength of the Kevlar fixing lines is high, and the mechanical strength and stability of the system are improved.
Compared with the conventional low-temperature measurement system, the low-temperature measurement system has the advantages that the stainless steel pipe is adopted to support the low-temperature measurement platform, the stainless steel pipe is directly fixed to the 4K cooling stage of the refrigerator or fixed to the secondary low-temperature cooling stage of the refrigerator, and then the stainless steel pipe is fixed to the 4K cooling stage of the refrigerator in other modes, and the low-temperature measurement system of the terahertz superconducting array imaging detector has the following technical progress:
1) The low-temperature measuring platform is suspended and fixed by the Kevlar fixing wire, the heat conduction coefficient of the Kevlar fixing wire in a 300mK temperature region is about 3-4 orders of magnitude smaller than that of stainless steel materials, the low-temperature measuring platform and a 4K cooling stage of a refrigerator can be effectively thermally isolated, and meanwhile, the Kevlar fixing wire is high in mechanical strength, so that the mechanical strength and the working stability of a system are effectively enhanced;
2) Three supporting pieces are adopted to suspend and fix the low-temperature measuring platform, and the supporting pieces are directly fixed on a 4K cooling stage of the refrigerator, so that the whole low-temperature measuring system is simple and compact in structure and easy to apply in practice;
3) The invention adopts the oxygen-free copper wire to connect the low-temperature measuring platform and the 0.3K cooling level of the refrigerator, the oxygen-free copper low-temperature heat conduction coefficient is high, and the effective cooling of the low-temperature measuring platform can be ensured.
the above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (3)
1. a terahertz superconducting array imaging detector low-temperature measurement system is characterized by comprising:
The low-temperature measuring platform (1) is used for mounting a terahertz superconducting array imaging detector;
The support piece (2) is directly fixed on a 4K cooling stage of the refrigerator and is used for supporting the low-temperature measuring platform (1);
The connecting piece (3) is used for connecting the low-temperature measuring platform (1) and the supporting piece (2);
A refrigerator 0.3K cooling stage (4) for cooling the cryogenic measurement platform (1);
the thermal connecting line (5) is connected with the low-temperature measuring platform (1) and the 0.3K cooling stage (4) of the refrigerator;
the low-temperature measuring platform (1) is a hexagonal oxygen-free copper plate, the surface of the low-temperature measuring platform is plated with gold, and a threaded hole is reserved in the side face of the low-temperature measuring platform;
The number of the supporting pieces (2) is three, the supporting pieces are respectively connected with the side face of the low-temperature measuring platform (1) through three connecting pieces (3), and the supporting pieces (2) are arranged around the low-temperature measuring platform (1) at equal angular intervals;
the support (2) comprises a support frame (21), a first fixed wheel (22), a second fixed wheel (22 '), a first fastener (23), a second fastener (23') and a fixed line (24); the first fixed wheel (22), the second fixed wheel (22 '), the first fastener (23) and the second fastener (23') are respectively installed at four corners of the supporting frame (21), wherein the first fixed wheel (22) and the second fastener (23 ') are arranged diagonally, and the second fixed wheel (22') and the first fastener (23) are arranged diagonally; the first fastening piece (23) and the second fastening piece (23 ') are used for locking a fixing line (24), one end of the fixing line (24) is fixed on the first fastening piece (23), the other end of the fixing line sequentially bypasses the second fixing wheel (22 ') and the first fixing wheel (22), and is finally fixed on the second fastening piece (23 '), so that the fixing line (24) forms a crisscross in the middle of the supporting frame (21), and the connecting piece (3) is arranged at the crossing position of the fixing line (24);
A wire groove matched with the crossed fixing wire (24) is formed in the side face of the connecting piece (3), the connecting piece (3) is suspended on the fixing wire (24) through the wire groove, and STYCAST is coated in the wire groove for fixing; and a screw through hole (31) is also formed in the connecting piece (3) and is matched with a threaded hole in the side surface of the low-temperature measuring platform (1).
2. The terahertz superconducting array imaging detector cryogenic measurement system of claim 1, wherein: the fixing line (24) is a Kevlar fixing line.
3. the terahertz superconducting array imaging detector cryogenic measurement system of claim 1, wherein: the thermal connecting wire (5) is an oxygen-free copper wire.
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| CN112263234A (en) * | 2020-11-18 | 2021-01-26 | 上海理工大学 | Human body acupuncture point detection device for detecting terahertz radiation signals and using method |
| CN113340841B (en) * | 2021-06-01 | 2022-10-11 | 苏州锐心观远太赫兹科技有限公司 | Terahertz ultralow-temperature superconducting detection system and reading circuit thereof |
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| CN1580742A (en) * | 2003-08-11 | 2005-02-16 | 中国科学院上海技术物理研究所 | Cold platform for low temperature working of infraved detector |
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