CN109489820B - Low-temperature adjustable field diaphragm of imaging infrared Fourier transform spectrum detector - Google Patents
Low-temperature adjustable field diaphragm of imaging infrared Fourier transform spectrum detector Download PDFInfo
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- CN109489820B CN109489820B CN201811387855.9A CN201811387855A CN109489820B CN 109489820 B CN109489820 B CN 109489820B CN 201811387855 A CN201811387855 A CN 201811387855A CN 109489820 B CN109489820 B CN 109489820B
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- 239000000758 substrate Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/45—Interferometric spectrometry
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Abstract
The invention discloses a low-temperature adjustable field diaphragm of an imaging infrared Fourier transform spectrum detector, which comprises a differential head, a differential head support, a locking mechanism, a corrugated pipe, a heat insulation nut, a right moving plate connecting rod, a left moving plate connecting rod, a diaphragm support and a cold chain interface. The diaphragm support is placed in the left moving plate connecting rod and the right moving plate connecting rod, the heat insulation nut and the heat insulation pipe are respectively screwed on the left moving plate connecting rod and the right moving plate connecting rod, the corrugated pipe is fixed on the wall surface of the cold box through screws, the heat insulation pipe is connected with threads in the corrugated pipe, the locking mechanism is sleeved on a round pin of the corrugated pipe, the micro head is supported by the micro head, is fixed through a screw clamp and then is pushed onto the round pin of the corrugated pipe, and the heat insulation pipe is compressed by the heat. The differential head at room temperature is manually adjusted to drive the left and right moving plate connecting rods at vacuum low temperature, the central position and the width of the low-temperature diaphragm are quantitatively and precisely adjusted, and mechanical locking can be performed. The device has simple structure, does not need a complex vacuum low-temperature electrical measurement and electrical regulation system, and does not have any pollution.
Description
Technical Field
The invention relates to the technology of infrared optical instruments, in particular to a cold optical field device with an adjustable field of view, which is applied to an imaging infrared Fourier transform spectrum detector. The infrared spectrum analyzer is used for detecting infrared fine spectrum of a target, and is used for atmospheric composition remote sensing, solar magnetic field detection and the like.
Background
The requirement on spectral resolution is extremely high for satellite atmospheric composition remote sensing or solar magnetic field infrared spectroscopy remote sensing detection. The spectral resolution index of the atmospheric super-radiation spectrometer currently under research is 0.015 wave number (approval 2016YFB0500600 for atmospheric radiation super-spectral detection technology, a project of key research and development in thirteen five countries of the department of science and technology), and the spectral resolution index of the solar magnetic field measurement spectrometer under research is 0.004 wave number (approval 11427901 for a mid-infrared observation system for accurate measurement of solar magnetic fields, a project of national significant fund). Due to the extremely high spectral resolution, the current technical method can only be a Fourier transform spectrum detection method. The problems that arise are narrow spectral bandwidths, low power, low signal, and low instrument stray light, which would otherwise significantly reduce the instrument signal-to-noise ratio. In order to block light outside the field of view to reduce stray light, a field stop is provided. For infrared instruments, the low-temperature field diaphragm can only play a role, and stray light can be reduced. The smaller the field of view of the instrument detector unit, the lower the temperature of the front detection target, and the smaller the signal, the lower the field diaphragm temperature is required. For example, the subsequent optical design temperature of the super-radiation atmospheric spectrometer is 90K, and the subsequent optical temperature of the solar magnetic field spectrum measuring instrument is 80K. A field stop is provided in these cryooptics, called cryo-stops.
It is not troublesome to design a normal temperature diaphragm, and it is much more troublesome to design a low temperature diaphragm. The subsequent optical system, the detector and the like are all made of different materials, one-time successful development is difficult to achieve, and the size and the position of a required field diaphragm of the optical system from normal temperature to low temperature are difficult to accurately calculate. And the accurate assembly and calibration of the thermal infrared band are difficult to achieve. Therefore, it is often desirable to perform a low temperature optical calibration after the optical system has cooled down. Therefore, there is a need to invent a low-temperature adjustable field diaphragm to adapt to the change of the size and the position of the diaphragm, so that the instrument can obtain the best performance.
For use at low temperatures, it must be placed in a vacuum. The low temperature and vacuum make the conditioning apparatus much more complex.
Disclosure of Invention
The invention aims to provide a low-temperature adjustable field diaphragm of an imaging infrared Fourier transform spectrum detector.
The technical scheme of the invention is as follows:
the low-temperature adjustable field diaphragm of the imaging infrared Fourier transform spectrum detector comprises a differential head 1, a differential head support 2, a locking mechanism 3, a corrugated pipe 4, a heat insulation pipe 6, a heat insulation nut 7, a right moving plate connecting rod 8, a left moving plate connecting rod 9, a diaphragm support 10 and a cold link interface 14 (figure 1).
The low-temperature adjustable field diaphragm of the imaging infrared Fourier transform spectrum detector can meet the requirement that the slit width and the central position of the field diaphragm are adjusted by adjusting the compression amount of the corrugated pipe at normal temperature and normal pressure when the field diaphragm is in a low-temperature vacuum environment.
The heat insulation support 12 is fixed on the wall surface 5 of the cold box through screws, the optical substrate 11 is fixed on the heat insulation support 12 through screws, the left moving plate connecting rod 9 is placed in a lower hole 10-2 of the diaphragm support 10, the right moving plate connecting rod 8 is placed in an upper hole 10-1 of the diaphragm support 10, the heat insulation nut 7 is screwed on the threads of the right moving plate connecting rod 8 and the left moving plate connecting rod 9 respectively, the heat insulation pipe 6 is screwed on the threads of the right moving plate connecting rod 8 and the left moving plate connecting rod 9, the corrugated pipe 4 is fixed on the wall surface 5 of the cold box through screws, the heat insulation pipe 6 is connected with the threads in the corrugated pipe 4 through a through hole on the wall surface 5 of the cold box, one end of the cold chain is fixed on the threaded holes of the right moving plate connecting rod 8 and the left moving plate connecting rod 9 respectively through a cold chain interface 14 through screws, the other end of the cold chain is fixed on the cold box substrate 11 through screws, the locking mechanism 3 is sleeved on, the differential head 1 supports 2 with the differential head and presss from both sides the fastening through the screw and fixes, adorns fine setting structure support base 13 through the screw on, differential head 1 pushes up 4 bellied round pins of bellows on, fine setting structure support base 13 is fixed in work platform through the screw on, compresses tightly thermal-insulated pipe 6 with adiabatic nut 7, adjusts differential head 1, gives the ripple pre-compression quantity of 4 inside bellows, seals the cold box, guarantees that the inside of cold box wall 5 is in vacuum low temperature environment.
The differential head 1 can realize the precise adjustment of the linear distance, the adjustment range is 0-4 mm, the division value is 0.01mm, and the precision is plus or minus 0.004 mm; the differential head support 2 is used for clamping and fixing the differential head 1; the locking mechanism 3 tightly holds the convex round pin on the corrugated pipe 4 through screwing the nut to extrude an internal grooving mechanism, and the field diaphragm is locked at a required position after adjustment; the length of the corrugation in the corrugated pipe 4 is 15mm, the maximum compression amount is 7mm, the range of the linear distance can be adjusted to be 4mm, and the effects of vacuum sealing and displacement transmission are achieved; the cold box wall surface 5 provides a vacuum low-temperature environment for the field diaphragm assembly; the wall thickness of the heat insulation pipe 6 is 0.2mm, and the heat insulation pipe is made of a titanium alloy material and is used for reducing the heat transferred to the field diaphragm assembly by the corrugated pipe 4; the heat insulation nut 7 is used for locking the heat insulation pipe 6; the right moving plate connecting rod 8 and the left moving plate connecting rod 9 are two cylindrical rods, and moving plates, namely a right moving plate 8-1 and a left moving plate 9-1 are respectively arranged on the two cylindrical rods, and the right moving plate 8-1 and the left moving plate 9-1 are boundaries of the diaphragm; the diaphragm support 10 is provided with a diaphragm support upper hole 10-1, a diaphragm support lower hole 10-2 and a seam with fixed width which can be inserted into the right moving plate 8-1 and the left moving plate 9-1, and the right moving plate 8-1 and the left moving plate 9-1 can move along the axial direction of the hole in the diaphragm support 10; the optical substrate 11 is used for placing the diaphragm support 10; the heat-insulating support 12 is used for ensuring that the heat of the wall surface 5 of the cold box is not transferred to the optical substrate 11; the fine adjustment structure supporting base 13 is used for fixing the micro head support 2; the cold chain interface 14 fixes the cold chain to the right moving plate connecting rod 8 and the left moving plate connecting rod 9, and the temperature of the field diaphragm is ensured to be constant.
Fig. 2 is a partial sectional view of the field stop portion of fig. 1. Wherein the right moving plate 8-1 and the left moving plate 9-1 are blackened and are positioned in a plane. This plane is the plane in the optical system that is conjugate to the optical imaging of the detector. In FIG. 2, a slit left between the right rotor 8-1 and the left rotor 9-1 is a light-transmitting part of the field slit diaphragm. The right moving plate 8-1 and the right moving plate connecting rod 8 are integrally manufactured, the left moving plate 9-1 and the left moving plate connecting rod 9 are also integrally manufactured, and the connecting rod parts of the right moving plate connecting rod 8 and the left moving plate connecting rod 9 are two cylindrical rods. The diaphragm support 10 is provided with a diaphragm support upper hole 10-1, a diaphragm support lower hole 10-2 and a fixed-width seam which can be inserted into the right moving plate 8-1 and the left moving plate 9-1, as shown in figure 3. The right moving plate connecting rod 8 and the left moving plate connecting rod 9 are inserted into two holes of the diaphragm support 10, and the right moving plate 8-1 and the left moving plate 9-1 are just inserted into a seam of the diaphragm support.
When the spectrometer is in a working state, the inner part of the wall surface of the cold box is in a closed low-temperature vacuum state, and the outer part of the wall surface of the cold box is in a normal-temperature atmospheric pressure state; when the left and right moving plates do reverse equivalent displacement, the width of the slit of the diaphragm is changed, and the slit center is unchanged; when the left and right moving plates move in the same direction and in the same amount, the center of the diaphragm slit changes, and the width does not change. Different combinations of the adjustment quantities of the two differential heads can meet the requirement of simultaneously changing the slit width and the central position of the field diaphragm.
The invention has the advantages that:
the device has the advantages that: 1) the size and the position of the diaphragm can be adjusted; 2) the instrument can be adjusted while working, manual real-time adjustment is used, and observation is performed while adjustment is performed, so that the instrument can easily work in the best view field. 3) The design of a heat insulation structure is adopted, so that heat leakage is as small as possible; 4) the thermal characteristics of the material are considered during design, the material can normally work when the temperature reaches 80K, and the phenomenon of blocking does not occur. 5) The customized corrugated pipe is used as a sealing element, the movement of parts inside and outside the vacuum low-temperature optical cold box is transmitted through the customized corrugated pipe, and the precise adjustment can be realized without using a vacuum low-temperature electronic driving mechanism; 6) the adjusting part uses a precise differential head, has small size, light weight, high precision, low price, convenient operation and locking and zero power consumption in the use process; 7) the diaphragm and the support are simultaneously connected with a cold source, so that the temperature of the cold diaphragm is uniform.
Drawings
FIG. 1 is a diagram of a low-temperature adjustable field diaphragm of an imaging infrared Fourier transform spectrum detector;
in the figure:
1-differential head;
2, supporting the differential head;
3-a locking mechanism;
4-a corrugated pipe;
5-wall surface of the cold box;
6, a heat insulation pipe;
7-heat insulation nut;
8-right moving plate connecting rod (8-1-right moving plate);
9-left rotor connecting rod (9-1-left rotor);
10-diaphragm support (10-1 diaphragm support upper hole, 10-2 diaphragm support lower hole);
11-an optical substrate;
12, heat insulation support;
13-fine tuning the structural support base;
14 — cold chain interface.
Fig. 2 is a partial sectional view of the field stop portion.
Fig. 3 is a side view of the diaphragm support.
Detailed Description
The structural example of the invention is shown in figure 1, and the invention is used for low-temperature adjustment of a field diaphragm of an imaging infrared Fourier transform spectrum detector. The main parameters are as follows: the adjusting range of the differential head 1 is 0-4 mm, the division value is 0.01mm, the precision is plus or minus 0.004mm, the length of the corrugated pipe 4 is 15mm, the maximum compression amount is 7mm, the heat insulation pipe 6 is made of a titanium alloy material, and the wall thickness is 0.2 mm.
The heat insulation support 12 is fixed on the wall surface 5 of the cold box through screws, the optical substrate 11 is fixed on the heat insulation support 12 through screws, the left moving plate connecting rod 9 is placed in a lower hole 10-2 of the diaphragm support 10, the right moving plate connecting rod 8 is placed in an upper hole 10-1 of the diaphragm support 10, the heat insulation nut 7 is screwed on the threads of the right moving plate connecting rod 8 and the left moving plate connecting rod 9 respectively, the heat insulation pipe 6 is screwed on the threads of the right moving plate connecting rod 8 and the left moving plate connecting rod 9, the corrugated pipe 4 is fixed on the wall surface 5 of the cold box through screws, the heat insulation pipe 6 is connected with the threads in the corrugated pipe 4 through a through hole on the wall surface 5 of the cold box, one end of the cold chain is fixed on the threaded holes of the right moving plate connecting rod 8 and the left moving plate connecting rod 9 through a cold chain interface 14 through screws, the other end of the cold chain is fixed on the cold box substrate 11 through screws, the locking mechanism 3 is sleeved on, the differential head 1 supports 2 with the differential head and presss from both sides the fastening through the screw and fixes, adorns fine setting structure support base 13 through the screw on, differential head 1 pushes up 4 bellied round pins of bellows on, fine setting structure support base 13 is fixed in work platform through the screw on, compresses tightly thermal-insulated pipe 6 with adiabatic nut 7, adjusts differential head 1, gives the ripple pre-compression quantity of 4 inside bellows, seals the cold box, guarantees that the inside of cold box wall 5 is in vacuum low temperature environment.
When the spectrometer is in a working state, the differential head 1 is adjusted to drive the corrugations in the corrugated pipe 4 to contract or extend, and further the right moving plate connecting rod 8 and the left moving plate connecting rod 9 are pushed to move; when the differential head is adjusted reversely in an equal amount, namely the right moving plate connecting rod 8 moves rightwards, the left moving plate connecting rod 9 moves leftwards, the width of the diaphragm slit is changed, and the slit center is unchanged; when the differential heads are adjusted in the same direction and in equal quantity, namely the right moving plate connecting rod 8 and the left moving plate connecting rod 9 move in the same quantity leftwards or rightwards simultaneously, the center of the diaphragm slit is changed, the width is unchanged, and then the adjustment of the width and the central position of the field diaphragm slit can be realized.
After the required position is adjusted, the corrugated pipe 4 is locked through the locking mechanism 3, and the heat insulation pipe 6, the heat insulation nut 7, the left moving plate connecting rod 8 and the right moving plate connecting rod 9 are kept at the required position, namely the position and the width of the field diaphragm are locked. And the adjustment amount is readable from the two differential heads.
Claims (1)
1. The utility model provides an adjustable visual field diaphragm of formation of image formula infrared Fourier transform spectrum detection instrument low temperature, includes differential head (1), differential head support (2), locking mechanism (3), bellows (4), thermal-insulated pipe (6), adiabatic nut (7), right moving plate connecting rod (8), left moving plate connecting rod (9), diaphragm support (10), cold chain interface (14), its characterized in that:
the heat insulation support (12) is fixed on the wall surface (5) of the cold box through screws, and the optical substrate (11) is fixed on the heat insulation support (12) through screws; a left moving plate connecting rod (9) is placed in an upper diaphragm support lower hole (10-2) of a diaphragm support (10), a right moving plate connecting rod (8) is placed in an upper diaphragm support upper hole (10-1) of the diaphragm support (10), a heat insulation nut (7) is screwed on threads of the right moving plate connecting rod (8) and the left moving plate connecting rod (9) respectively, a heat insulation pipe (6) is screwed on the threads of the right moving plate connecting rod (8) and the left moving plate connecting rod (9), a corrugated pipe (4) is fixed on a cold box wall surface (5) through screws, the heat insulation pipe (6) is connected with the threads in the corrugated pipe (4) through a through hole in the cold box wall surface (5), one end of a cold chain is fixed on threaded holes of the right moving plate connecting rod (8) and the left moving plate connecting rod (9) through a cold chain interface (14) through screws, and the other end of the cold chain is fixed on a cold box base plate (11) through screws; the locking mechanism (3) is placed on a round pin protruding on the corrugated pipe (4); the differential head (1) is clamped and fixed by a differential head support (2) through screws, and is arranged on a fine adjustment structure support base (13) through screws, the differential head (1) is propped against a convex round pin of the corrugated pipe (4), the fine adjustment structure support base (13) is fixed by the screws, a heat insulation pipe (6) is compressed by a heat insulation nut (7), the differential head (1) is adjusted, the corrugated precompression quantity in the corrugated pipe (4) is given, the cold box is sealed, and the inner part of the wall surface (5) of the cold box is ensured to be in a vacuum low-temperature environment;
the right moving plate connecting rod (8) and the left moving plate connecting rod (9) are two cylindrical rods, and moving plates, namely a right moving plate (8-1) and a left moving plate (9-1), are respectively arranged on the two cylindrical rods, and the right moving plate (8-1) and the left moving plate (9-1) are boundaries of the diaphragm; the diaphragm support (10) is provided with a diaphragm support upper hole (10-1), a diaphragm support lower hole (10-2) and a seam with fixed width which can be inserted into the right moving plate (8-1) and the left moving plate (9-1), and the right moving plate (8-1) and the left moving plate (9-1) can move along the axial direction of the hole in the diaphragm support (10); the right moving plate (8-1) and the left moving plate (9-1) are blackened and are positioned on a plane conjugate with the optical imaging of the detector in the optical system; a slit left between the right moving plate (8-1) and the left moving plate (9-1) is a light-transmitting part of a field slit diaphragm; when the spectrometer is in a working state, the inner part of the wall surface of the cold box is in a closed low-temperature vacuum state, and the outer part of the wall surface of the cold box is in a normal-temperature atmospheric pressure state; when the left and right moving plates do reverse equivalent displacement, the width of the slit of the diaphragm is changed, and the center of the slit is unchanged; when the left and right moving plates move in the same direction and in the same amount, the center of the diaphragm slit changes, the width does not change, and the different combinations of the adjustment amounts of the two differential heads can meet the requirement of simultaneously changing the width and the central position of the field diaphragm slit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811387855.9A CN109489820B (en) | 2018-11-21 | 2018-11-21 | Low-temperature adjustable field diaphragm of imaging infrared Fourier transform spectrum detector |
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| CN201811387855.9A CN109489820B (en) | 2018-11-21 | 2018-11-21 | Low-temperature adjustable field diaphragm of imaging infrared Fourier transform spectrum detector |
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| CN109489820B true CN109489820B (en) | 2020-08-07 |
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| CN110470392A (en) * | 2019-07-10 | 2019-11-19 | 中国科学院上海技术物理研究所 | Low temperature optical-mechanical system based on SiC particulate reinforced aluminum matrix composites Vacuum cooling case |
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| CN102288293B (en) * | 2011-07-21 | 2013-10-23 | 中国科学院上海技术物理研究所 | Low-temperature interferometer |
| CN205037971U (en) * | 2015-09-22 | 2016-02-17 | 中国科学院上海技术物理研究所 | Long wave imaging spectrometer low temperature model |
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