CN108986600B - Composite heat diaphragm cooling device of solar telescope - Google Patents
Composite heat diaphragm cooling device of solar telescope Download PDFInfo
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- CN108986600B CN108986600B CN201810783248.8A CN201810783248A CN108986600B CN 108986600 B CN108986600 B CN 108986600B CN 201810783248 A CN201810783248 A CN 201810783248A CN 108986600 B CN108986600 B CN 108986600B
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- 238000001816 cooling Methods 0.000 title claims abstract description 21
- 239000002131 composite material Substances 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 104
- 239000000758 substrate Substances 0.000 claims abstract description 32
- 239000000110 cooling liquid Substances 0.000 claims abstract description 31
- 230000003287 optical effect Effects 0.000 claims description 18
- 150000001875 compounds Chemical class 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 3
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- 230000002708 enhancing effect Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 10
- 238000003384 imaging method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
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Abstract
The invention discloses a composite heat diaphragm cooling device of a solar telescope. In a large-aperture solar telescope system, sunlight blocked by a thermal diaphragm can not only cause temperature rise, but also bring a stray light source. The invention comprises a thermal diaphragm substrate, a jet impact plate, a reflecting plate and a thermal diaphragm insert. And the central position of the heat diaphragm base body is provided with a light path channel. The reflecting surface of the heat diaphragm base body is provided with a diaphragm placing groove and a jet flow cavity. And a reflecting plate is fixed on the reflecting surface of the heat diaphragm base body. The inner side surface of the reflecting plate is fixed with a jet impact plate. N liquid inlet flow channels and n liquid outlet flow channels are formed in the heat diaphragm substrate. The hot diaphragm plug-in is inserted in the diaphragm placing groove of the hot diaphragm base body. The middle part of the thermal diaphragm plug-in is provided with a light inlet channel. The edge of the outer side surface of the heat diaphragm plug-in is flush with the inner contour of the reflecting plate, and the middle part of the heat diaphragm plug-in is arranged in a convex mode. The invention can increase the Reynolds number of the cooling liquid in the liquid inlet flow channel through the design of the reducing holes, thereby enhancing the heat exchange performance.
Description
Technical Field
The invention belongs to the technical field of telescopes, and particularly relates to a composite heat diaphragm cooling device of a solar telescope.
Background
Along with the continuous improvement of the requirements on the time, space and spectral resolution of observation of the solar active region phenomenon, the aperture of the solar telescope is continuously increased in order to obtain higher spatial resolution capability, and meanwhile, the larger the aperture of the telescope is, the stronger the light condensation capability of the telescope is, thereby bringing about serious thermal effect.
The radiation heat of the sunlight which is received by the main reflecting mirror of the meter-level solar telescope and focused on the focal plane exceeds kilowatt, and along with the continuous convergence of the sunlight beams, the sunlight which is finally projected on the rear-end optical system reaches higher power density, and finally the heat damage of optical devices and even mechanical structures is caused.
For thermal control, a real focus is added between the primary and secondary mirrors of the solar telescope to limit the field size. By the field limitation, most of heat is cut off on the field diaphragm, so that energy entering a subsequent optical system is reduced. The field stop located at the primary focus of the optical system is called thermal stop. The temperature of the substrate can be rapidly raised due to the cut-off heat of the thermal diaphragm, so that the thermal damage of the thermal diaphragm substrate can be caused on one hand, and the thermal stability of the air in the lens barrel can be damaged on the other hand, thereby causing a serious seeing effect. Therefore, in the design of the thermal diaphragm of the main focal plane, the following two main factors which restrict the imaging quality of the optical system of the solar telescope exist.
(1) The thermal control design of the heat diaphragm high-density heat flow of the main focal plane is difficult, and the heat dissipation effect directly influences the spatial resolution of the optical system.
(2) In order to acquire high signal-to-noise ratio images, the imaging field of view needs to be strictly controlled for the main focal plane field diaphragm. The clear aperture directly affects the stray light condition in the optical system, and affects the performance of the obtained high signal-to-noise ratio image.
In a large-aperture solar telescope system, sunlight blocked by a thermal diaphragm can not only cause temperature rise of a substrate, but also bring a stray light source, so that the thermal diaphragm has the functions of heat dissipation and stray light elimination.
At present, a multi-inlet single-cavity type thermal diaphragm cooling device for a foundation solar telescope is provided, which mainly comprises a plurality of liquid inlet pipes, a plurality of liquid outlet pipes, a cooling cavity and a diaphragm reflecting panel; the cooling cavity is located the dorsal part of diaphragm reflection panel and hugs closely diaphragm reflection panel, directly links to each other with a plurality of feed liquor pipes and a plurality of drain pipes, and feed liquor pipe and drain pipe equipartition are on the ring that uses telescope main optical axis as the axis, and a plurality of feed liquor pipes are closer to telescope main optical axis than a plurality of drain pipes. However, the device still has the defects that the thermal control effect at the focal point of the thermal diaphragm reflecting panel is poor, the temperature gradient of the reflecting panel is large, most of reflected light and scattered light can enter the thermal diaphragm light-passing opening, and the imaging quality of a subsequent optical system is further influenced.
Disclosure of Invention
The invention aims to provide a composite thermal diaphragm cooling device of a solar telescope.
The invention comprises a thermal diaphragm substrate, a jet impact plate, a reflecting plate and a thermal diaphragm insert. And the central position of the heat diaphragm base body is provided with a light path channel. The light path channel is funnel-shaped, and a large-diameter opening of the light path channel is positioned at the center of the light-emitting surface of the thermal diaphragm substrate. The reflecting surface of the heat diaphragm base body is provided with a diaphragm placing groove and a jet flow cavity. And a reflecting plate is fixed on the reflecting surface of the heat diaphragm base body. The inner side surface of the reflecting plate is fixed with a jet impact plate. The side of the jet impact plate far away from the reflecting plate is a rough surface.
N liquid inlet flow channels and n liquid outlet flow channels are formed in the heat diaphragm substrate, wherein n is more than or equal to 1 and less than or equal to 10. The liquid inlets of the n liquid inlet flow channels are all positioned on the light-emitting surface of the heat diaphragm substrate and are uniformly distributed along the geometric center of the light-emitting surface of the heat diaphragm substrate. The liquid outlets of the n liquid inlet flow channels are communicated with the jet flow cavity. The diameter of the cross section of the liquid inlet flow channel is gradually reduced in the direction from the liquid inlet to the liquid outlet, and the liquid inlet flow channel is gradually close to the central axis of the light path channel. And liquid inlets of the liquid outlet flow channels are communicated with the jet flow cavity. Liquid outlets of the liquid outlet flow passage are all positioned on the light-emitting surface of the heat diaphragm substrate and are uniformly distributed along the geometric center of the light-emitting surface of the heat diaphragm substrate.
The thermal diaphragm plug-in is inserted in the diaphragm placing groove of the thermal diaphragm base body. The middle part of the thermal diaphragm plug-in is provided with a light inlet channel. The light inlet channel is funnel-shaped. The large-diameter port of the light inlet channel is in butt joint with the small-diameter port of the light path channel, and the small-diameter port is a light inlet. The edge of the outer side surface of the heat diaphragm plug-in is flush with the inner contour of the reflecting plate, and the middle part of the heat diaphragm plug-in is arranged in a convex mode.
Furthermore, the outer side surfaces of the thermal diaphragm insert and the reflecting plate are coated with thermal control coatings.
Furthermore, the invention also comprises a cooling liquid tank and a liquid inlet pump. The liquid inlets of the n liquid inlet flow channels are communicated with the output port of the liquid inlet pump. The input port of the liquid inlet pump and the liquid outlets of the n liquid outlet flow channels are communicated with the cooling liquid tank. The cooling liquid box is filled with cooling liquid.
Further, the cooling liquid adopts Cu-water nanofluid with the volume fraction of 2.0%.
Furthermore, the axis of the optical path channel is perpendicular to the light-emitting surface of the thermal diaphragm base body, and forms an included angle of 60 degrees with the reflecting surface of the thermal diaphragm base body.
Furthermore, the jet cavity is annular and surrounds the diaphragm accommodating groove. The reflecting plate is annular, the outer edge of the reflecting plate is the same as the outline shape of the reflecting surface of the thermal diaphragm substrate, and the inner edge of the reflecting plate is the same as the outline shape of the diaphragm accommodating groove. The reflector plate completely covers and seals the fluidic chamber.
Further, the roughness Ra of the rough surface on the jet impact plate was 4.040.
Further, the distance from the liquid outlet of the liquid inlet flow channel to the diaphragm accommodating groove is smaller than the distance from the liquid inlet of the liquid outlet flow channel to the diaphragm accommodating groove. The diameter of the liquid outlet of the liquid inlet flow passage is larger than that of the cross section of the liquid outlet flow passage.
Further, the diameter of the small-diameter opening of the light inlet channel is 3 mm.
Furthermore, the thermo-optic stop substrate is fixed in the solar telescope, and the light inlet of the thermo-optic stop insert is positioned at the focus of the primary reflector of the solar telescope. The central axis of the optical path on the heat aperture substrate is coincident with the central axis of the main reflector of the solar telescope.
The invention has the beneficial effects that:
1. the liquid inlet flow channel adopts a tapered hole type design, the Reynolds number of the cooling liquid fluid in the liquid inlet flow channel can be increased under the same cooling liquid flow rate, and the heat exchange between the cooling liquid fluid and the jet flow impact plate is further enhanced.
2. The side surface of the jet impact plate, which faces the liquid inlet flow channel, is rough, so that the jet impact range on the jet impact plate is larger, and the thickness of the boundary layer of the cooling liquid fluid on the jet impact plate is reduced. Thereby improving the effect of jet impact heat exchange.
3. The liquid outlet of the liquid inlet flow passage is inclined towards the light path passage, so that the cooling effect of the cooling liquid on the main heating area on the heat diaphragm substrate is improved.
4. The cooling liquid in the invention adopts 2.0 percent of Cu-water nanofluid. The nanometer fluid has high heat conductivity coefficient, and the nanometer particles impact the jet flow impact plate continuously, so that the heat exchange effect between the cooling liquid fluid and the jet flow impact plate is enhanced.
5. The tapered outer side surface of the heat diaphragm insert which is inclined and protrudes outwards can reduce the entering of reflected light and scattered light into a small-diameter opening of the heat diaphragm insert, and further ensures the imaging quality.
6. The thermal diaphragm insert and the thermal diaphragm substrate are fixed together in an inserting mode, so that the thermal diaphragm insert can be replaced according to different use requirements, the diameter of a light through hole of the composite thermal diaphragm cooling device of the solar telescope is changed, and the requirements of different imaging view fields are met.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
fig. 3 is a schematic view of a thermo-optic insert of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the composite thermal diaphragm cooling device for the solar telescope comprises a thermal diaphragm base body 1, a jet flow impact plate 6, a reflecting plate 7, a cooling liquid tank, a liquid inlet pump and a thermal diaphragm plug-in piece 8. The reflection surface of the heat diaphragm base body 1 is in an oval shape, and the light emergent surface is in a round shape (the light emergent surface is positioned opposite to the reflection surface).
The central position of the heat diaphragm base body 1 is provided with a light path channel 4. The axis of the light path channel 4 is vertical to the light-emitting surface of the thermal diaphragm base body 1, and forms an included angle of 60 degrees with the reflecting surface of the thermal diaphragm base body 1. The light path channel 4 is funnel-shaped, and the large-diameter opening of the light path channel 4 is positioned on the light-emitting surface of the thermal diaphragm matrix 1. The reflecting surface of the heat diaphragm base body 1 is provided with a diaphragm placing groove and a jet flow cavity 5. The jet cavity 5 is annular and surrounds the diaphragm accommodating groove. A reflecting plate 7 is fixed to the reflecting surface of the heat stop base 1. The reflecting plate 7 is annular, the outer edge of the reflecting plate is the same as the outline shape of the reflecting surface of the thermal diaphragm substrate 1, and the inner edge of the reflecting plate is the same as the outline shape of the diaphragm accommodating groove. The outer side of the reflector plate 7 is coated with a thermal control coating. The reflector plate 7 completely covers and seals the fluidic chamber 5. The jet impact plate 6 is fixed on the inner side surface of the reflecting plate 7. The side of the jet impact plate 6 far away from the reflecting plate is a rough surface. The roughness Ra of the rough surface was 4.040. When the cooling liquid fluid flowing into the liquid outlet 10 of the liquid inlet flow channel impacts the jet impact plate 6, the radial mixing of the cooling liquid fluid can be increased by the large roughness of the rough surface, so that the turbulence degree of the cooling liquid fluid is increased, and better composite enhanced heat exchange is realized.
Four liquid inlet flow channels 3 and four liquid outlet flow channels 2 are arranged in the heat diaphragm base body 1. Liquid inlets 11 of the four liquid inlet flow channels are all positioned on the light-emitting surface of the heat diaphragm substrate 1 and are uniformly distributed along the geometric center of the light-emitting surface of the heat diaphragm substrate 1. The liquid outlets 10 of the four liquid inlet flow channels are communicated with the jet flow cavity 5. The diameter of the cross section of the liquid inlet flow channel is gradually reduced in the direction from the liquid inlet 11 to the liquid outlet 10, and the liquid inlet flow channel is gradually close to the central axis of the light path channel 4, so that the liquid inlet flow channel is closer to the region with the most serious heat generation on the heat diaphragm substrate 1, and the cooling efficiency is improved. The diameter of the liquid outlet 10 of the liquid inlet flow passage is larger than the diameter of the cross section of the liquid outlet flow passage 2. The liquid inlet flow channel gradually reduces the section, the Reynolds number of the cooling liquid fluid in the liquid inlet flow channel can be increased, and the heat exchange between the cooling liquid fluid and the jet flow impact plate is further enhanced. Meanwhile, the diameter of the liquid inlet flow channel is larger than that of the liquid outlet flow channel, so that the cooling liquid can be locally accelerated in the jet flow cavity 5.
The liquid inlets of the liquid outlet flow channels 2 are communicated with the jet flow cavity 5. Liquid outlets of the liquid outlet flow passage 2 are all located on the light-emitting surface of the heat diaphragm base body 1 and are uniformly distributed along the geometric center of the light-emitting surface of the heat diaphragm base body 1. The distance from the liquid outlet 10 of the liquid inlet flow channel 4 to the diaphragm setting groove is less than the distance from the liquid inlet of the liquid outlet flow channel 2 to the diaphragm setting groove. Liquid inlets 11 of the four liquid inlet flow channels are communicated with an output port of a liquid inlet pump. The input port of the liquid inlet pump and the liquid outlets of the four liquid outlet flow channels 2 are communicated with the cooling liquid tank. The cooling liquid box is filled with cooling liquid. The cooling liquid adopts Cu-water nanofluid with the volume fraction of 2.0 percent. The 2.0% Cu-water nanofluid increases the heat conductivity coefficient of the cooling liquid on one hand, and on the other hand, Cu nanoparticles continuously impact on the jet impact plate 6 to strengthen the interaction between the particles and the wall surface and reduce a speed boundary layer and a temperature boundary layer, so that the heat transfer between the solid wall surface and the nanofluid is enhanced.
As shown in fig. 1, 2 and 3, the thermo-diaphragm insert 8 is inserted into the diaphragm seating groove of the thermo-diaphragm base body 1. The middle part of the thermal diaphragm plug-in 8 is provided with a light inlet channel. The light inlet channel is funnel-shaped. The large diameter port of the light inlet channel is in butt joint with the small diameter port of the light path channel 4, and the small diameter port is a light inlet 12. The diameter of the small-diameter opening of the light inlet channel is 3 mm. The outer side 9 of the thermal diaphragm insert 8 is coated with a thermal control coating. The edge of the outer side of the hot stop insert 8 is flush with the inner contour of the reflector plate 7 and the middle is arranged convex (i.e. higher than the edge of the outer side of the hot stop insert 8). The inclined convex conical outer side surface of the thermal diaphragm plug-in 8 can reduce the incidence of reflected light and scattered light into the light inlet 12 of the thermal diaphragm plug-in 8, thereby ensuring the imaging quality. Because the thermal diaphragm plug-in 8 is fixed together through the mode of pegging graft with thermal diaphragm base member 1, so can be to different user demands more heat exchange diaphragm plug-in 8, and then change this solar telescope's compound thermal diaphragm cooling device's logical light mouth diameter, satisfy the demand of different formation of image visual fields.
The heat diaphragm base body 1 is fixed in the solar telescope, and the light inlet 12 of the heat diaphragm insert 8 is positioned at the focus of the primary reflector of the solar telescope. The central axis of the optical path channel 4 on the heat diaphragm base body 1 is coincided with the central axis of the main reflecting mirror of the solar telescope.
Sunlight focused by the primary mirror, within the effective field of view, enters the subsequent optical system through the entrance 12 of the thermal stop insert 8. Non-imaging light rays outside the effective field of view are reflected out of the main optical axis by the thermal diaphragm plug-in 8 and the reflecting plate, so that the imaging quality of a subsequent optical system is ensured.
The working principle of the invention is as follows:
the light focused by the reflector irradiates on the thermal diaphragm plug-in unit and the reflecting plate, part of the light enters a subsequent optical system through a light inlet of the thermal diaphragm plug-in unit, and the rest of the light is reflected by the thermal diaphragm plug-in unit and the reflecting plate. In this process, the temperature of the hot stop insert and the reflector plate rises.
In order to reduce the temperature of the thermal diaphragm plug-in and the reflecting plate, the liquid inlet pump is started, and cooling liquid enters the incident flow cavity 5 from the liquid inlet flow channel 3 to form circular hole jet flow between the liquid inlet flow channel 3 and the jet flow impact plate 6. The circular hole jet flow is blocked by the jet flow impact plate 6 to form jet flow impact, and then heat on the reflecting plate and the heat diaphragm plug-in is taken away.
Claims (7)
1. A composite thermal diaphragm cooling device of a solar telescope comprises a thermal diaphragm substrate, a jet flow impact plate, a reflecting plate and a thermal diaphragm plug-in piece; the method is characterized in that: the cooling device also comprises a cooling liquid tank and a liquid inlet pump; the central position of the heat diaphragm base body is provided with a light path channel; the light path channel is funnel-shaped, and a large-diameter opening of the light path channel is positioned at the central position of the light-emitting surface of the thermal diaphragm substrate; a diaphragm placing groove and a jet cavity are formed on the reflecting surface of the thermal diaphragm base body; a reflecting plate is fixed on the reflecting surface of the heat diaphragm base body; a jet impact plate is fixed on the inner side surface of the reflecting plate; one side of the jet impact plate, which is far away from the reflecting plate, is a rough surface; the roughness Ra of the rough surface on the jet impact plate is 4.040;
n liquid inlet flow channels and n liquid outlet flow channels are formed in the heat diaphragm substrate, wherein n is more than or equal to 1 and less than or equal to 10; liquid inlets of the n liquid inlet flow channels are all positioned on the light-emitting surface of the heat diaphragm substrate and are uniformly distributed along the geometric center of the light-emitting surface of the heat diaphragm substrate; liquid outlets of the n liquid inlet flow channels are communicated with the jet flow cavity; the diameter of the cross section of the liquid inlet flow channel is gradually reduced along the direction from the liquid inlet to the liquid outlet, and the liquid inlet flow channel is gradually close to the central axis of the light path channel; liquid inlets of the liquid outlet flow passages are communicated with the jet flow cavity; liquid outlets of the liquid outlet flow passage are all positioned on the light-emitting surface of the heat diaphragm substrate and are uniformly distributed along the geometric center of the light-emitting surface of the heat diaphragm substrate;
the hot diaphragm plug-in is inserted in the diaphragm placing groove of the hot diaphragm substrate; the middle part of the hot diaphragm plug-in is provided with a light inlet channel; the light inlet channel is funnel-shaped; the large-diameter port of the light inlet channel is in butt joint with the small-diameter port of the light path channel, and the small-diameter port is a light inlet; the edge of the outer side surface of the heat diaphragm plug-in is flush with the inner contour of the reflecting plate, and the middle part of the heat diaphragm plug-in is arranged in a convex way;
liquid inlets of the n liquid inlet flow channels are communicated with an output port of a liquid inlet pump; the input port of the liquid inlet pump and the liquid outlets of the n liquid outlet flow channels are communicated with the cooling liquid tank; the cooling liquid box is filled with cooling liquid; the cooling liquid adopts Cu-water nanofluid with the volume fraction of 2.0 percent.
2. A compound thermal aperture cooling arrangement for a solar telescope, as claimed in claim 1, wherein: and the outer side surfaces of the thermal diaphragm plug-in and the reflecting plate are coated with thermal control coatings.
3. A compound thermal aperture cooling arrangement for a solar telescope, as claimed in claim 1, wherein: the axis of the light path channel is perpendicular to the light-emitting surface of the thermal diaphragm base body, and forms an included angle of 60 degrees with the reflecting surface of the thermal diaphragm base body.
4. A compound thermal aperture cooling arrangement for a solar telescope, as claimed in claim 1, wherein: the jet cavity is annular and surrounds the diaphragm placement groove; the reflecting plate is annular, the outer edge of the reflecting plate is the same as the outline shape of the reflecting surface of the thermal diaphragm substrate, and the inner edge of the reflecting plate is the same as the outline shape of the diaphragm accommodating groove; the reflector plate completely covers and seals the fluidic chamber.
5. A compound thermal aperture cooling arrangement for a solar telescope, as claimed in claim 1, wherein: the distance from the liquid outlet of the liquid inlet flow channel to the diaphragm accommodating groove is smaller than the distance from the liquid inlet of the liquid outlet flow channel to the diaphragm accommodating groove; the diameter of the liquid outlet of the liquid inlet flow passage is larger than that of the cross section of the liquid outlet flow passage.
6. A compound thermal aperture cooling arrangement for a solar telescope, as claimed in claim 1, wherein: the diameter of the small-diameter opening of the light inlet channel is 3 mm.
7. A compound thermal aperture cooling arrangement for a solar telescope, as claimed in claim 1, wherein: the heat diaphragm substrate is fixed in the solar telescope, and the light inlet of the heat diaphragm plug-in is positioned at the focus of the main reflecting mirror of the solar telescope; the central axis of the optical path on the heat aperture substrate is coincident with the central axis of the main reflector of the solar telescope.
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| CN201810783248.8A CN108986600B (en) | 2018-07-17 | 2018-07-17 | Composite heat diaphragm cooling device of solar telescope |
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| CN201810783248.8A CN108986600B (en) | 2018-07-17 | 2018-07-17 | Composite heat diaphragm cooling device of solar telescope |
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| CN110202095A (en) * | 2019-06-20 | 2019-09-06 | 广东肇庆动力金属股份有限公司 | Core mold and the casting mould for preparing core mold |
| CN110596879B (en) * | 2019-09-23 | 2020-10-30 | 中国科学院云南天文台 | Heat diaphragm suitable for annular solar telescope |
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| AU2003220397A1 (en) * | 2002-03-19 | 2003-10-08 | Lasermax, Inc. | Artificial star generation apparatus and method for reflective, refractive and catadioptric telescope systems |
| CN101846469A (en) * | 2009-03-26 | 2010-09-29 | 中国石油化工股份有限公司 | Heat exchanger with twisted sheet |
| DE102010024003A1 (en) * | 2010-06-11 | 2011-12-15 | Karl Storz Gmbh & Co. Kg | endoscope |
| CN103050869B (en) * | 2012-12-18 | 2014-12-17 | 华中科技大学 | Micro-pore cooling mirror with mirror surface of non-equal thickness |
| CN103412399B (en) * | 2013-07-20 | 2016-05-18 | 中国科学院光电技术研究所 | Multi-inlet single-cavity type thermal diaphragm cooling device for foundation solar telescope |
| CN104931151B (en) * | 2015-06-24 | 2017-10-20 | 中国科学院光电技术研究所 | Non-contact measuring device for measuring mirror surface temperature of primary mirror of large-aperture solar telescope |
| CN105587959B (en) * | 2016-01-18 | 2018-08-28 | 北京航空航天大学 | A kind of variable cross-section method of the control U-shaped bend pipe flow separation of low reynolds number |
| CN105607241B (en) * | 2016-02-05 | 2018-08-03 | 中国科学院西安光学精密机械研究所 | Optical system of solar telescope |
| CN107727237A (en) * | 2017-09-05 | 2018-02-23 | 北京航天长征飞行器研究所 | A kind of ground heat test Low Temperature Target infrared radiation measurement device and method |
| CN107678524A (en) * | 2017-10-11 | 2018-02-09 | 西安交通大学 | A kind of chip-cooling system |
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Inventor after: Li Rong Inventor after: Weng Jiahao Inventor after: Lin Wei Inventor after: Zhang Yin Inventor after: Zhang Juyong Inventor after: Chen Zhiping Inventor before: Li Rong Inventor before: Lin Wei Inventor before: Zhang Yin Inventor before: Zhang Juyong Inventor before: Chen Zhiping |
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Granted publication date: 20201103 |