CN212364047U - Cold optical system of long-wave infrared Doppler difference interferometer - Google Patents
Cold optical system of long-wave infrared Doppler difference interferometer Download PDFInfo
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- CN212364047U CN212364047U CN202021148540.1U CN202021148540U CN212364047U CN 212364047 U CN212364047 U CN 212364047U CN 202021148540 U CN202021148540 U CN 202021148540U CN 212364047 U CN212364047 U CN 212364047U
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Abstract
The utility model provides a cold optical system of long wave infrared Doppler difference interferometer solves current interferometer during operation at non-low temperature, and optical system's background heat radiation produces the problem of noise influence formation of image effect. The system comprises an optical system, a low-temperature vacuum Dewar system, an opposed Stirling refrigeration system, a metal corrugated pipe and a detection system; the low-temperature vacuum Dewar system comprises a vacuum Dewar, and a radiation-proof shield, a support plate, a heat-conducting plate and a plurality of heat-insulating support columns which are arranged in the vacuum Dewar; the radiation-proof shield and the optical system are arranged on the heat-conducting plate; the cold fingers of the opposed Stirling refrigerating system penetrate through the vacuum Dewar and the radiation-proof shield and are connected with the heat-conducting plate; one end of the metal corrugated pipe is fixed on the vacuum Dewar, and the other end of the metal corrugated pipe is connected with a connecting disc; the detection system comprises a detector mounting bracket fixed on the outer wall of the vacuum Dewar and a detector arranged on the detector mounting bracket through a two-dimensional precision adjusting platform, and a cold screen of the detector is connected with the central hole of the connecting disc.
Description
Technical Field
The utility model relates to a doppler difference interferometer, concretely relates to cold optical system of infrared doppler difference interferometer of long wave.
Background
The earth's atmospheric environment is a very complex dynamic system with physical, chemical and biological characteristics of the air on which living organisms live, wherein the characteristics of temperature, humidity, wind speed, etc. caused by solar radiation are important parameters for detecting the atmospheric environment.
The middle and high-rise atmospheric wind field detection is an important means for representing atmospheric environment and atmospheric dynamics characteristics, and has important significance for accurate weather forecast and smooth operation of aerospace industry. The Doppler difference interference technology takes a Michelson interference technology as a prototype, is improved on the basis of a spatial heterodyne interference technology, and obtains information such as wind speed and the like by inverting an interference fringe phase through Fourier transform. The development of the wind field detector is rapid in recent years, and the wind field detector becomes a hot spot of a passive wind field detection technology. The long-wave infrared is taken as an application waveband of the Doppler differential interference technology, has important significance for atmospheric wind field detection, but the research work on the long-wave infrared waveband in the Doppler differential interference technology is relatively less at present.
The design difficulty of the long-wave infrared Doppler difference interferometer mainly lies in background heat radiation, and all objects higher than absolute zero degree have heat radiation, so that the inner surface of an optical machine is a background heat radiation source, the heat radiation of the optical machine system interferes signals seriously at normal temperature of 300K, and the weak target signals are covered by the background heat radiation generated by the optical machine system after being subjected to light splitting. In the design process of the optical system, the use background of the optical system is set to be a low-temperature environment, so that a background heat radiation source of the long-wave infrared interferometer is eliminated. When the temperature is reduced from normal temperature to low temperature, the thermal expansion coefficient of the system structural member and the optical member material is not matched, so that large thermal stress and thermal deformation are generated, and the problems of interference fringe inclination, modulation degree reduction, influence on phase inversion accuracy and the like are further generated.
For terrestrial targets, mostly around 300K, the radiation peak of the target is around 10 μm according to the brownian equation. At this time, if the internal optical element mechanical structure of the optical system is also at room temperature, the radiation of the self-wave inside the instrument can become the main source of stray light observed in the infrared band, so that to realize high-sensitivity and low-noise observation, the infrared equipment needs to be refrigerated, and firstly, the dark current noise of the infrared detector is suppressed by refrigerating the infrared focal plane; secondly, the optical system is refrigerated through the cold optical technology, and the thermal background radiation sensed by the detector is reduced.
In the structural design, besides ensuring the structural strength, high-precision positioning and structural stability which need to be considered in the design of a conventional optical system, the background heat radiation inhibition design of the optical system, namely the cold optical design, also needs to be considered in an important way. In order to realize high-sensitivity and low-noise detection of a long-wave infrared system, the thermally generated dark current of a detector needs to be ensured to be reduced to a level which can be ignored compared with the sky background; the thermal background radiation sensed by the detector must be reduced to a level that can be ignored compared to the larger of the sky background or the detector dark current, and therefore it is highly desirable to design a structure that allows for low temperature refrigeration of the thermal noise sensitive portion of the optical system.
SUMMERY OF THE UTILITY MODEL
In order to solve present long wave infrared Doppler difference interferometer at non-low temperature during operation, optical system's background heat radiation produces the noise, influences the technical problem of spectral imaging effect, the utility model provides a cold optical system of long wave infrared Doppler difference interferometer.
In order to achieve the above purpose, the utility model provides a technical scheme is:
a long-wave infrared Doppler difference interferometer cold optical system comprises an optical system, wherein the optical system comprises a front optical component, an interferometer optical component and a rear imaging optical component which are sequentially arranged along a light path, and is characterized in that: the system also comprises a low-temperature vacuum Dewar system, an opposed Stirling refrigerating system, a metal corrugated pipe and a detection system;
the low-temperature vacuum Dewar system comprises a vacuum Dewar with a box-type structure, and a support assembly and an anti-radiation shield which are arranged in the vacuum Dewar;
the supporting component comprises a supporting plate, a heat conducting plate and a plurality of heat insulation supporting columns; the lower part of the heat insulation supporting column is connected with the bottom surface of the vacuum Dewar, and the upper part of the heat insulation supporting column is connected with the supporting plate; the heat conducting plate is arranged on the supporting plate;
the radiation-proof shield and the optical system are both arranged on the heat conducting plate, and the optical system is positioned in the radiation-proof shield;
polishing the outer surface of the radiation-proof shield, and performing black anodizing on the inner surface of the radiation-proof shield;
optical inlets are formed in the positions, opposite to the front optical assembly, of the radiation-proof shield and the vacuum dewar;
optical outlets are arranged at the positions of the radiation-proof shield and the vacuum dewar opposite to the rear imaging optical component;
the cold fingers of the opposed Stirling refrigerating system sequentially penetrate through the vacuum Dewar and the radiation-proof shield and are connected with the heat-conducting plate;
the metal corrugated pipe is positioned between the optical outlet of the vacuum Dewar and the optical outlet of the radiation-proof shield, one end of the metal corrugated pipe is fixed on the inner wall of the vacuum Dewar, the other end of the metal corrugated pipe is provided with a connecting disc, and a central hole is formed in the connecting disc;
the detection system is arranged outside the vacuum Dewar and positioned at the optical outlet, the detection system comprises a detector mounting bracket and a detector, the detector mounting bracket is fixed on the outer wall of the vacuum Dewar, the detector is arranged on the detector mounting bracket through a two-dimensional precision adjusting table, and a cold screen and a connecting disc of the detector are hermetically connected with the central hole; the two-dimensional precision adjusting platform is used for adjusting the movement of the detector in two-dimensional directions to realize the focusing adjustment of the image surface of the detector.
Further, the heat conducting plate is a red copper plate made of T2 material;
the supporting plate is made of a hard aluminum alloy material 2A12T 4;
the heat insulation support column is made of titanium alloy TC4 material with low thermal conductivity coefficient.
Furthermore, a polyimide heat insulation sleeve is arranged at the joint of the heat insulation support column and the support plate.
Further, the vacuum Dewar is made of stainless steel materials, and the wall thickness is 6-10 mm;
the vacuum Dewar comprises a box body and an upper cover plate, wherein the opening position of the upper cover plate and the opening position of the box body are fixed through screws, and an O-shaped sealing ring is arranged between the box body and the upper cover plate.
Furthermore, the radiation protection shield is of a thin-wall metal shield structure, the material of the radiation protection shield is duralumin alloy 2A12T4, the thickness of the radiation protection shield is 2mm, and the outer surface of the radiation protection shield is wrapped with a polyimide film and multiple layers of heat insulation materials.
Furthermore, an infrared window glass is arranged at the optical inlet of the vacuum Dewar in a gluing mode, and the infrared window glass is made of germanium.
Further, the detection system further comprises a protective cover arranged on the outer side of the vacuum Dewar, and the detector mounting bracket and the detector are both positioned inside the outer protective cover.
Furthermore, a plurality of bosses are arranged on the supporting plate;
the heat conducting plate is provided with a plurality of through holes matched with the bosses, and the bosses penetrate through the through holes in the heat conducting plate and are connected with the optical system.
Further, the connecting disc is arranged on the inner wall of the metal corrugated pipe;
and a mounting boss is arranged at one end of the heat conducting plate close to the opposed Stirling refrigerating system, and the mounting boss extends out of the radiation-proof shield and is connected with the cold finger.
Compared with the prior art, the utility model has the advantages that:
1. the optical system is arranged in the vacuum Dewar, and the vacuum Dewar can ensure that the optical system is in a sealed vacuum environment; the optical system is fixed on the vacuum Dewar through the heat conducting plate, the supporting plate and the heat insulation supporting column, the heat conducting plate and the supporting plate are in double-layer heterogeneous design, the heat conducting and supporting functions are respectively realized, the optical system is prevented from being deformed due to thermal stress generated by mismatching of expansion coefficients during temperature change, the influence of the temperature change on components of the optical system is effectively reduced, meanwhile, the support is realized through the small-area heat insulation supporting column with larger thermal resistance, the heat conduction efficiency between the optical system and the inner wall of the vacuum Dewar is greatly reduced, and the heat leakage of the low-temperature vacuum Dewar system is effectively reduced; and the heat conducting plate is communicated with an opposed Stirling refrigerating system outside the vacuum Dewar to realize refrigeration of the optical system, ensure temperature uniformity of the internal optical system, reduce noise influence generated by background temperature radiation of the optical system during working at non-low temperature, improve spectral imaging effect and ensure phase inversion precision and wind measurement precision of the long-wave infrared Doppler difference interferometer.
2. The utility model discloses the detector passes through two-dimentional accurate adjustment platform to be set up on detector installing support, and two-dimentional accurate adjustment platform is used for adjusting the removal of detector two-dimentional direction, realizes the adjustment of detector image plane focus, can guarantee the contact ratio of detector target surface and optical system focal plane, ensures the good of formation of image; meanwhile, the detector is connected with the vacuum Dewar through a metal corrugated pipe, the metal corrugated pipe is used for sealing the position of an optical outlet on one hand, and the metal corrugated pipe can adapt to the requirement of two-dimensional fine adjustment displacement of the detector on the other hand.
3. The utility model discloses the heat-conducting plate is the copper plate, at the refrigerating system during operation, can carry out heat exchange fast, improves optical system cooling rate to good temperature homogeneity has when guaranteeing temperature variation.
4. The utility model discloses the vacuum dewar adopts stainless steel material, has good corrosion resistance to for the rectangle box of rule, there is not obvious dead angle, can guarantee the efficiency of evacuation, does benefit to and improves cooling rate.
5. The utility model discloses be equipped with the polyimide radiation shield sleeve in adiabatic support column and backup pad junction, further increase the thermal resistance, reduce heat transfer.
6. The utility model discloses radiation protection shield surface parcel polyimide film and multilayer heat-insulating material reduce the vacuum dewar and by the thermal radiation heat transfer between the refrigeration optical system.
7. The utility model discloses the optics entrance of vacuum dewar is equipped with infrared window glass, adopts the germanium material, can increase the entering of infrared band light, and on infrared window glass was fixed in the vacuum dewar through sticky mode from the outside, during outer low temperature refrigeration, ambient pressure was greater than internal pressure, can be reliably fixed with infrared window glass to can ensure effectual sealing performance.
Drawings
FIG. 1 is a schematic perspective view of a long-wave infrared Doppler difference interferometer cold optical system according to the present invention;
FIG. 2 is a schematic side view of the long-wave infrared Doppler difference interferometer cold optical system of the present invention;
FIG. 3 is a first cross-sectional view (in the vertical direction) of the long-wave infrared Doppler difference interferometer cold optical system of the present invention;
FIG. 4 is a sectional view (along the horizontal direction) of the long-wave infrared Doppler difference interferometer cold optical system of the present invention;
FIG. 5 is a schematic view of a metal bellows and a detection system installed at an optical exit of a vacuum dewar in a long wave infrared Doppler difference interferometer cold optical system of the present invention;
wherein the reference numbers are as follows:
1-interferometer optics, 2-front optics, 3-rear imaging optics, 4-radiation protection shield, 5-heat conducting plate, 6-support plate, 7-adiabatic support column, 8-vacuum Dewar, 9-upper cover plate, 10-opposed Stirling refrigeration system, 11-cold chain, 12-cold finger, 13-metal bellows, 131-connection plate, 132-center hole, 14-detector, 141-cold shield, 142-detector Dewar, 143-support plate, 15-two-dimensional fine adjustment table, 16-detector mounting bracket, 17-bottom plate, 18-O type sealing ring, 19-infrared window glass, 20-mounting boss, 21-external protection cover, 22-handle, 23-low temperature vacuum Dewar system, 24-detection system.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments.
As shown in fig. 1 to 5, a long-wave infrared doppler difference interferometer cold optical system is structurally divided into modules according to functions, and mainly comprises an optical system, a detection system 24, a bottom plate 17, a low-temperature vacuum dewar system 23 and an opposed stirling refrigerating system 10, wherein the low-temperature vacuum dewar system 23 and the opposed stirling refrigerating system 10 are arranged on the bottom plate 17, the optical system is arranged in the vacuum dewar system, and the optical system is refrigerated through the opposed stirling refrigerating system 10; the method effectively reduces the noise influence (reduces the background noise) generated by the radiation of the background temperature of the system when the interferometer works at a non-low temperature, improves the spectral imaging effect, and ensures the phase inversion precision and the wind measurement precision of the long-wave infrared Doppler difference interferometer. The interferometer cold optical system structure is designed such that on the one hand, reliable mechanical support for the optical system and the detector 14 is required and on the other hand, the accuracy requirements of the optical system, in particular as a support for the optical system, are ensured, the temperature environment adaptability of the support structure and the good thermal compensation capability being taken into consideration. Therefore, in the design of the supporting structure, the optical, mechanical, electrical and thermal integration consideration is required, reasonable structural forms and materials are selected, good heat conduction and heat insulation capability is achieved, and the thermal stability of the optical system is ensured.
The optical system comprises a front optical component 2, an interferometer optical component 1 and a rear imaging optical component 3 which are arranged in sequence along an optical path.
The low-temperature vacuum Dewar system 23 comprises a vacuum Dewar 8 with a box-type structure, a support component and a radiation-proof shield 4, wherein the support component and the radiation-proof shield are arranged in the vacuum Dewar 8; the vacuum Dewar 8 is of a box-type structure and comprises a box body bottom plate, side plates and an upper cover plate 9, wherein the side plates and the box body bottom plate are welded and fixed to form a whole, the box body is formed and fixed to the upper cover plate 9 through screws, an O-shaped sealing ring 18 is arranged at the joint of the side plates and the upper cover plate, and the O-shaped sealing ring 18 is 2.3mm in wire diameter. The wall thickness of the vacuum Dewar 8 is reasonably designed according to the size of materials and the inner cavity, generally 6-10 mm, and the wall thickness is designed to be 8mm in the embodiment, so that the vacuum Dewar can have the pressure bearing capacity of one atmospheric pressure. The vacuum Dewar 8 is made of 304 stainless steel materials, has good corrosion resistance, is designed into a regular rectangular box body, has no obvious dead angle, can ensure the vacuumizing efficiency, and is beneficial to improving the cooling rate.
Vacuum dewar 8 is equipped with the optics entry with leading optical assembly 2 relative position, for guaranteeing the optical imaging demand, vacuum dewar 8's optics entrance is provided with infrared window glass 19, infrared window glass 19 passes through adhesive fixation in optics entry position, the window material adopts germanium, diameter 60mm, thickness 10mm, infrared window glass 19 adopts the germanium material, can increase the entering of infrared band light, infrared window glass 19 is fixed in vacuum dewar 8 through adhesive fixation from the outside, during outer low temperature refrigeration, external pressure is greater than internal pressure, can fix infrared window glass 19 on vacuum dewar 8 reliably, and can ensure effectual sealing performance.
The supporting component comprises a supporting plate 6, a heat conducting plate 5 and a plurality of heat-insulating supporting columns 7; the heat conducting plate 5 and the supporting plate 6 are used to support the optical system and are connected with the vacuum dewar 8 through the heat insulating supporting column 7.
The radiation protection shield 4 and the optical system are both arranged on the heat conducting plate 5, the optical system is located in a cavity formed by the radiation protection shield 4 and the heat conducting plate 5, the heat conducting plate 5 is a red copper plate made of T2 materials and used for rapidly guiding out heat inside the radiation protection shield 4 to the refrigerating machine cold chain 11 and keeping the temperature uniformity of the optical system, a plurality of square through holes and 4 circular through holes are formed in the heat conducting plate 5, and the side faces of the heat conducting plate are provided with threaded holes. The red copper plate made of the T2 material can exchange heat quickly during refrigeration, so that the cooling speed is increased, and good temperature uniformity can be guaranteed during temperature change.
The supporting plate 6 is a mounting plate made of a hard aluminum alloy material 2A12T4 and used for supporting an optical system, the material of the supporting plate is consistent with that of the optical system (a component to be refrigerated), thermal deformation caused by different expansion coefficients of the material is avoided, the optical system is mounted on the upper portion of the supporting plate 6, and the lower portion of the supporting plate is connected with the vacuum Dewar 8 through a heat insulation supporting column; the supporting plate 6 is provided with a plurality of bosses.
Optical system is the modularization subassembly, is equipped with a plurality ofly (usually 8) to the outer mounting hole that connects, and the aperture is 5.5mm for be connected with backup pad 6, specifically be: the lower parts of the heat-insulating support columns 7 are connected with the bottom surface of the vacuum Dewar 8 through titanium alloy screws, the upper parts of the heat-insulating support columns are connected with the support plate 6 through screws, the heat-conducting plate 5 is arranged on the support plate 6, and a circular through hole is formed in the center of the heat-conducting plate 5 and is used for being connected with the support plate 6 through screws; the boss on the supporting plate 6 penetrates through the through hole on the upper part of the heat conducting plate 5 and is fixed with the connecting and mounting hole of the optical system through a screw.
The radiation-proof shield 4 is arranged on the heat-conducting plate 5; an optical inlet is arranged at the position of the radiation-proof screen 4 opposite to the front optical component 2, and an optical outlet is arranged at the position of the radiation-proof screen 4 opposite to the rear imaging optical component 3. The radiation-proof shield 4 is of a thin-wall metal shield structure, is made of hard aluminum alloy 2A12T4 and has the thickness of 2mm, and can be of a spliced shield structure, and the shield structure is formed by assembling, mounting and splicing front, back, left and right covers and an upper cover plate; the radiation protection shield 4 is polished outside to increase the surface reflectivity, and black anodization is performed inside to increase the uniformity of the internal temperature, and the polyimide film and the multilayer heat insulating material are wrapped on the outer surface of the radiation protection shield 4 to reduce the heat radiation heat transfer between the surface of the vacuum dewar 8 and the optical system. The side of the radiation-proof shield 4 is provided with a plurality of circular through holes all around, the circular through holes are connecting holes matched with threaded holes in the side surfaces of the radiation-proof shield 4 and the heat conducting plate 5, the radiation-proof shield 4 is connected with the threaded holes in the side surface of the heat conducting plate 5 through a connecting piece, and the connecting piece is a standard screw fastening piece.
Adiabatic support column 7 is optical system, heat-conducting plate 5, the whole bearing structure who is connected with vacuum dewar 8 of backup pad 6 and radiation protection shield 4, be used for supporting above-mentioned subassembly on the one hand (optical system, heat-conducting plate 5, backup pad 6 and radiation protection shield 4), on the one hand as the high heat resistance node, in order to reduce vacuum dewar 8 and optical system's heat-conduction, adopt 5 points to support (5 adiabatic support column 7) in the design, the lower titanium alloy TC4 material of thermal conductivity coefficient is chooseed for use to adiabatic support column 7's material, support column diameter design is 8mm, and the design has the polyimide heat insulating mattress, can realize further increasing the thermal resistance. And a polyimide heat insulation sleeve is arranged at the joint of the heat insulation support column 7 and the support plate 6.
The Stirling refrigerating machine comprises 2 refrigerating machines, a cold chain 11 and cold fingers 12, wherein the 2 refrigerating machines are arranged in an opposite mode, the cold fingers 12 of the opposite Stirling refrigerating system 10 sequentially penetrate through a vacuum Dewar 8 and a radiation-proof shield 4 to be connected with a heat-conducting plate 5, in order to facilitate connection, a mounting boss 20 is arranged at one end, close to the opposite Stirling refrigerating system 10, of the heat-conducting plate 5, and the mounting boss 20 extends out of the radiation-proof shield 4 to be connected with the cold fingers 12; the refrigerator of the opposed Stirling system is used for generating cold energy, and the refrigeration of the internal component (optical system) is realized by heat exchange between the cold finger 12 and the cold chain conduction and the internal heat conduction plate 5 and the optical system component. The 2 refrigerators are arranged oppositely, so that the vibration of the compressor during working is reduced, and the influence of the vibration is greatly reduced.
The vacuum Dewar 8 is provided with a through hole (optical outlet) at the position opposite to the rear imaging optical component 3 for light passing imaging; detection system 24 is disposed outside vacuum dewar 8 and at the optical outlet, detection system 24 including detector mounting bracket 16 and detector 14; the detector 14 is an imaging component, which ensures effective passage of the light path, and is of an existing structure, including a low-power refrigerator, a detector chip, a detector dewar 142, a cold shield 141, and the like.
The detector 14 is arranged on a detector mounting bracket 16 through a two-dimensional precision adjusting table 15, the detector mounting bracket 16 is fixed on the outer wall of the vacuum Dewar 8, and the two-dimensional precision adjusting table 15 is used for adjusting the position of the detector 14 in the two-dimensional direction to realize the image plane focusing adjustment of the detector 14; the detector 14 and the vacuum dewar 8 are connected in a sealing manner, and the position of the detector 14 can be changed by adjusting the two-dimensional precision adjusting table 15, so that the detector 14 and the vacuum dewar 8 are connected in a sealing manner through the metal corrugated pipe 13, and the two-dimensional displacement adjustment of the detector 14 can be realized under the condition that the detector 14 and the vacuum dewar 8 are well sealed by utilizing the flexible characteristic of the metal corrugated pipe 13, and the connection mode of the metal corrugated pipe 13 is specifically as follows: the metal corrugated pipe 13 is positioned between an optical outlet of the vacuum Dewar 8 and an optical outlet of the radiation-proof shield cover 4, the outer end of the metal corrugated pipe 13 is in sealing connection with the inner wall of the vacuum Dewar 8 through a flange, the other end of the metal corrugated pipe is provided with a connecting disc 131, a central hole 132 is formed in the connecting disc 131, the central hole 132 can be a conical hole matched with a cold screen 141 structure of the detector 14, the cold screen 141 of the detector 14 is in sealing fixation with the central hole 132 of the connecting disc 131 on the end face of the metal corrugated pipe 13 through an O-shaped sealing ring, and is sealed in a filling and sealing mode through silicon rubber GD414, so that the metal corrugated pipe 13 and the. During debugging work, the detector 14 and the metal corrugated pipe 13 are driven to move through the precise displacement of the two-dimensional precise adjusting platform 15, the adjustment of a focal plane is realized, the definition of imaging is ensured, and meanwhile, the metal corrugated pipe 13 is positioned at the optical outlet of the vacuum Dewar 8, so that the sealing inside the vacuum Dewar 8 is realized.
The detection system 24 further comprises a support plate 143 disposed between the metal bellows 13 and the two-dimensional fine adjustment stage 15 for supporting the remaining components in the detector 14.
The two-dimensional precision adjusting platform 15 is used for adjusting the motion of the detector 14 in two-dimensional directions, the two-dimensional precision adjusting platform 15 comprises a vacuum low-temperature motor, a transmission gear, a one-dimensional nut screw precision transmission mechanism kit and a driving ball support rod, the vacuum low-temperature motor is used for driving the motion of the motion mechanism, firstly, the transmission gear is driven to rotate, then, the nut screw precision transmission mechanism is driven to move, the ball support rod is driven to move in one dimension, the detector 14 is driven to precisely move along the axial direction through the ball support rod, and temperature focusing compensation is realized; the transmission gear is a small modulus straight gear made of copper alloy HPb59-1, is arranged on an output shaft of the motor and is in motion connection with a nut-screw precision transmission mechanism suite; the nut screw precision transmission mechanism suite is a standard module and is used for converting rotary motion input by a transmission gear into linear precision movement and driving the ball head support rod to perform precision displacement.
The axial direction of the detector 14 is defined as the front and back of the horizontal direction, and the adjustment of the two-dimensional direction comprises the left and right and front and back of the horizontal direction; the detector 14 is an outsourcing assembly, the resolution ratio is 320 × 256, the Stirling refrigerator refrigerating system is arranged, the target surface refrigerating temperature is 77K, and an independent external connection interface is arranged, so that the installation and the fixation are convenient; the detector mounting support 16 can ensure the adjustment of the detector 14 in the two-dimensional orthogonal direction, the adjustment precision is 0.005mm, the contact ratio of the target surface of the detector 14 and the focal plane of the internal optical system can be ensured, and the excellent imaging is ensured.
The detection system 24 is further designed with an outer protective cover 21, and the detector mounting bracket 16 and the detector 14 are both located inside the outer protective cover 21 for dust protection of the detector mounting bracket 16 and the detector 14.
In this embodiment, the bottom plate 17 is used as an integrated substrate, on which the optical system, the detection system 24, the low-temperature vacuum dewar system 23 and the opposed stirling refrigerating system 10 are integrated, and the bottom plate 17 is made of hard aluminum alloy material and is provided with 4 handles 22, which is convenient for transportation and carrying.
The cold optical system of the interferometer of the present embodiment integrally mounts an optical system on a violet copper metal plate with good thermal conductivity, and the front optical assembly 2, the interferometer optical assembly 1 and the rear imaging optical assembly 3 can debug the optical performance on the metal plate. The periphery of the optical system is designed with an anti-radiation shield 4 which is used as an inner metal protective cover, the surface of the anti-radiation shield is coated with a heat insulating material and a film material with good light reflection, and the low-temperature vacuum Dewar 8 and the optical system are isolated from heat radiation exchange due to the temperature difference. The optical system that needs refrigeration is whole to be connected with low temperature vacuum dewar 8 box as the part through the good supporting component of thermal-insulated effect, and the supporting component plays optical system's supporting role in addition, still carries out the heat exchange with optical system's subassembly and opposed type stirling refrigerating system 10 through heat-conducting plate 5, realizes optical system's refrigeration, has guaranteed the cryogenic stability requirement of optical system, and then improves interferometer's phase inversion precision.
The interferometer cold optical system has a simple installation structure and is convenient to disassemble, and trimming structures with height and spacing distance can be arranged among the components; the method has good temperature adaptability, and effectively reduces the influence of temperature change on phase inversion accuracy.
The above description is only for the preferred embodiment of the present invention, and the technical solution of the present invention is not limited thereto, and any known modifications made by those skilled in the art on the basis of the main technical idea of the present invention belong to the technical scope to be protected by the present invention.
Claims (9)
1. The long-wave infrared Doppler difference interferometer cold optical system comprises an optical system, wherein the optical system comprises a front optical component (2), an interferometer optical component (1) and a rear imaging optical component (3) which are sequentially arranged along a light path, and is characterized in that: the device also comprises a low-temperature vacuum Dewar system (23), an opposite Stirling refrigerating system (10), a metal corrugated pipe (13) and a detection system (24);
the low-temperature vacuum Dewar system (23) comprises a vacuum Dewar (8) with a box-type structure, and a support assembly and a radiation-proof shield (4) which are arranged in the vacuum Dewar (8);
the supporting component comprises a supporting plate (6), a heat conducting plate (5) and a plurality of heat-insulating supporting columns (7); the lower part of the heat insulation supporting column (7) is connected with the bottom surface of the vacuum Dewar (8), and the upper part of the heat insulation supporting column is connected with the supporting plate (6); the heat conducting plate (5) is arranged on the supporting plate (6);
the radiation-proof shield (4) and the optical system are both arranged on the heat-conducting plate (5), and the optical system is positioned in the radiation-proof shield (4);
the outer surface of the radiation-proof shield (4) is polished, and the inner surface is anodized in black;
optical inlets are formed in the positions, opposite to the front optical assembly (2), of the radiation-proof shield (4) and the vacuum dewar (8);
optical outlets are arranged at the positions of the radiation-proof shield (4) and the vacuum dewar (8) opposite to the rear imaging optical component (3);
cold fingers (12) of the opposed Stirling refrigeration system (10) sequentially penetrate through the vacuum Dewar (8) and the radiation-proof shield cover (4) to be connected with the heat-conducting plate (5);
the metal corrugated pipe (13) is positioned between an optical outlet of the vacuum Dewar (8) and an optical outlet of the radiation-proof shield cover (4), one end of the metal corrugated pipe (13) is fixed on the inner wall of the vacuum Dewar (8), the other end of the metal corrugated pipe is provided with a connecting disc (131), and a central hole (132) is formed in the connecting disc (131);
the detection system (24) is arranged outside the vacuum Dewar (8) and located at an optical outlet, the detection system (24) comprises a detector mounting support (16) and a detector (14), the detector mounting support (16) is fixed on the outer wall of the vacuum Dewar (8), the detector (14) is arranged on the detector mounting support (16) through a two-dimensional precision adjusting platform (15), and a cold screen (141) and a connecting disc (131) of the detector (14) are connected to a central hole (132) in a sealing mode.
2. The long-wave infrared doppler difference interferometer cold optical system of claim 1, wherein: the heat conducting plate (5) is a red copper plate made of T2 material;
the supporting plate (6) is made of a hard aluminum alloy material 2A12T 4;
the heat insulation support column (7) is made of titanium alloy TC4 material with low thermal conductivity coefficient.
3. The long-wave infrared doppler difference interferometer cold optical system of claim 2, wherein: and a polyimide heat insulation sleeve is arranged at the joint of the heat insulation support column (7) and the support plate (6).
4. The long-wave infrared doppler difference interferometer cold optical system of claim 3, wherein: the vacuum Dewar (8) is made of stainless steel materials, and the wall thickness is 6-10 mm;
the vacuum Dewar (8) comprises a box body and an upper cover plate (9), the opening position of the upper cover plate (9) and the box body is fixed through screws, and an O-shaped sealing ring (18) is arranged between the box body and the upper cover plate (9).
5. The long-wave infrared Doppler difference interferometer cold optical system of any one of claims 1 to 4, wherein: the radiation protection shield (4) is of a thin-wall metal shield structure, is made of hard aluminum alloy 2A12T4 and is 2mm thick, and the outer surface of the radiation protection shield (4) is wrapped with a polyimide film and multiple layers of heat insulation materials.
6. The long-wave infrared doppler difference interferometer cold optical system of claim 5, wherein: an infrared window glass (19) is arranged at an optical inlet of the vacuum Dewar (8) in an adhesive mode, and the infrared window glass (19) is made of germanium.
7. The long-wave infrared doppler difference interferometer cold optical system of claim 6, wherein: the detection system (24) further comprises a protective cover (21) arranged on the outer side of the vacuum Dewar (8), and the detector mounting bracket (16) and the detector (14) are both positioned inside the outer protective cover (21).
8. The long-wave infrared doppler difference interferometer cold optical system of claim 1, wherein: a plurality of bosses are arranged on the supporting plate (6);
the heat conducting plate (5) is provided with a plurality of through holes matched with the bosses, and the bosses penetrate through the through holes in the heat conducting plate (5) to be connected with the optical system.
9. The long-wave infrared doppler difference interferometer cold optical system of claim 1, wherein: the connecting disc (131) is arranged on the inner wall of the metal corrugated pipe (13);
and a mounting boss (20) is arranged at one end of the heat conducting plate (5) close to the opposed Stirling refrigerating system (10), and the mounting boss (20) extends out of the radiation-proof shield cover (4) to be connected with the cold finger (12).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735763A (en) * | 2020-06-19 | 2020-10-02 | 中国科学院西安光学精密机械研究所 | Cold optical system of long-wave infrared Doppler difference interferometer |
| CN114563084A (en) * | 2022-02-07 | 2022-05-31 | 中电科思仪科技股份有限公司 | Real-time Fourier infrared spectrum radiation measurement system and measurement method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735763A (en) * | 2020-06-19 | 2020-10-02 | 中国科学院西安光学精密机械研究所 | Cold optical system of long-wave infrared Doppler difference interferometer |
| CN114563084A (en) * | 2022-02-07 | 2022-05-31 | 中电科思仪科技股份有限公司 | Real-time Fourier infrared spectrum radiation measurement system and measurement method |
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