CN110672556A - Thermal control device of Doppler differential interferometer with high thermal stability - Google Patents
Thermal control device of Doppler differential interferometer with high thermal stability Download PDFInfo
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- CN110672556A CN110672556A CN201910815919.9A CN201910815919A CN110672556A CN 110672556 A CN110672556 A CN 110672556A CN 201910815919 A CN201910815919 A CN 201910815919A CN 110672556 A CN110672556 A CN 110672556A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The invention relates to a thermal control device of a Doppler differential interferometer with high thermal stability, which solves the problem of low measurement precision of the conventional Doppler differential interferometer. The device comprises a vacuum box body, a box body cover plate, a thermal control shell and a thermal control plate; the cover plate of the box body and the vacuum box body form a vacuum cavity; the vacuum box body is provided with window glass for light inlet and light outlet, a box body vacuum interface for vacuumizing, a box body heating sheet interface connected with a heating sheet, and a box body thermistor interface connected with a thermistor; the window glass is axially pressed on the vacuum box body through the window pressing ring, and a window heat insulation pad is arranged between the window glass and the window pressing ring; a window glass rubber pad is arranged between the vacuum box body and the window glass; the thermal control shell and the thermal control plate are arranged in the vacuum cavity, and the Doppler differential interferometer assembly is arranged in an installation cavity formed by the thermal control shell and the thermal control plate; the thermal control plate is provided with a plurality of heating sheets and thermistors for heating and temperature feedback.
Description
Technical Field
The invention relates to a thermal control device, in particular to a thermal control device of a Doppler differential interferometer with high thermal stability.
Background
The wind field and the temperature field are important foundations for recognizing the physical phenomenon process of the middle and upper atmosphere, researching the momentum, energy and component transport between the upper and lower atmosphere, revealing the basic rule and change of the upper and lower atmosphere and establishing a forecasting and predicting model. The Doppler differential interferometer system is an important device for detecting a middle-high atmospheric wind field, and is used for reflecting information such as the high atmospheric wind field, temperature and the like by using a passive optical remote sensing method for measuring airglow characteristic radiation according to Doppler frequency shift and broadening of airglow spectral lines, so that the Doppler differential interferometer system is required to have extremely high spectral resolution capability.
As a novel wind measuring device, a Doppler differential interferometer is a core component of the wind measuring device, and a differential interferometer is very sensitive to temperature change, ambient temperature fluctuation can cause temperature fluctuation and thermal stress of an interferometer component, so that the difference of the basic optical paths of two arms of the interferometer is easy to change, the phase of an interferogram is caused to drift, and further the phase inversion precision is reduced, and therefore high-thermal-stability thermal control needs to be carried out on the Doppler differential interferometer.
Disclosure of Invention
The invention aims to solve the problem of low measurement precision of the conventional Doppler differential interferometer and provides a thermal control device of the Doppler differential interferometer with high thermal stability.
The device disclosed by the invention has the advantages that through designing an interferometer vacuum box body structure, a thermal control structure, a heat insulation measure and the like, an interferometer assembly works in an environment with low heat conduction, low heat convection and low heat radiation, and the temperature control system is controlled by temperature, so that the interferometer assembly is passively controlled by temperature, the temperature stability of the interferometer assembly is superior to the control precision of the temperature control system, the interferometer assembly is ensured to stably work in the thermal control system, and the measurement precision of the Doppler difference interferometer is improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a thermal control device of a Doppler difference interferometer with high thermal stability comprises a vacuum box body, a box body cover plate, a thermal control shell and a thermal control plate; the box body cover plate is arranged above the vacuum box body and forms a vacuum cavity with the vacuum box body; the vacuum box body is provided with window glass for light inlet and light outlet, a box body vacuum interface for vacuumizing, a box body heating sheet interface connected with a heating sheet, and a box body thermistor interface connected with a thermistor; the window glass is axially pressed on the vacuum box body through the window pressing ring, and a window glass rubber pad is arranged between the window glass and the window pressing ring; a window heat insulation pad is arranged between the vacuum box body and the window pressing ring; the thermal control shell and the thermal control plate are arranged in the vacuum cavity, and the Doppler differential interferometer assembly is arranged in an installation cavity formed by the thermal control shell and the thermal control plate; an interferometer heat insulation pad is arranged between the Doppler differential interferometer assembly and the thermal control plate, and a heating plate heat insulation pad is arranged between the thermal control plate and the vacuum box body; the thermal control plate is provided with a plurality of heating sheets and thermistors, the thermal control plate is heated and temperature feedback is carried out, and the temperature of the thermal control plate is uniformly and stably controlled by controlling the output power of the heating sheets.
Further, the bottom of vacuum box is provided with the box and repaiies the cutting plate, the bottom of box is repaiied the cutting plate and is provided with a plurality of trimming bosss.
Furthermore, a box body heat insulation pad is arranged between the box body trimming plate and the vacuum box body.
Furthermore, the vacuum box body is connected with the box body trimming plate and the box body heat insulation pad through screws, and a box body heat insulation T-shaped sleeve is arranged between the screws and the mounting hole of the vacuum box body.
Further, the inner surfaces of the vacuum box body and the box body cover plate are polished surfaces, and gold-plated layers are arranged on the inner surface and the outer surface of the thermal control shell.
Furthermore, the Doppler difference interferometer assembly, the thermal control plate and the vacuum box body are connected through screws, and an interferometer heat insulation T-shaped sleeve is arranged between the screws and the installation holes of the Doppler difference interferometer assembly.
Further, a window axial sealing ring and a window radial sealing ring are arranged on the contact surface of the vacuum box body and the window glass, and the window radial sealing ring is pressed in through a radial sealing pressing ring.
Further, a box cover plate sealing ring is arranged between the vacuum box body and the box cover plate.
Furthermore, heat-conducting silicone grease is arranged on the contact surface of the thermal control shell and the thermal control plate, and heat insulating materials are wrapped on the outer surfaces of the vacuum box body and the box body cover plate.
Further, the minimum wall thickness t of the vacuum box body0＝0.224B/σBendWherein B is the length of the shortest side of the box body, sigmaBendIs the flexural strength of the material.
Compared with the prior art, the invention has the following beneficial effects:
1. the device can be used for improving the temperature stability of the Doppler difference interferometer, reducing the optical path difference change and the surface shape change of the Doppler difference, causing the quality of interference images and further improving the phase inversion precision.
2. The device provides a good thermal control environment for the Doppler differential interferometer, has small thermal convection, small thermal radiation and small heat conduction, reduces the influence of external temperature fluctuation on the Doppler differential interferometer as much as possible, and improves the temperature stability of the Doppler differential interferometer.
3. The box cover plate, the optical window, the electrical interface and the vacuum interface of the device have good sealing performance, and the vacuum box assembly has good vacuum retention performance, so that the thermal convection can be reduced, and the influence of gas on the optical performance of the Doppler differential interferometer can be reduced.
4. The device has simple installation structure, is convenient to disassemble and adjust, is easy to implement thermal control, and can ensure that the Doppler difference interferometer has high installation precision in a system light path.
Drawings
FIG. 1 is a cross-sectional view of a thermal control device of a high thermal stability Doppler differential interferometer of the present invention;
FIG. 2 is a schematic diagram of a conventional Doppler differential interferometer assembly;
FIG. 3 is a schematic view of the installation of the Doppler differential interferometer assembly of the present invention;
FIG. 4 is a first structural diagram of a thermal control device of the Doppler difference interferometer with high thermal stability according to the present invention;
FIG. 5 is a structural diagram of a thermal control device of the Doppler difference interferometer with high thermal stability according to the second embodiment of the present invention.
Reference numerals: 1-vacuum box, 2-box cover plate seal ring, 3-box cover plate, 4-window axial seal ring, 5-window glass, 6-window radial seal ring, 7-window glass rubber gasket, 8-radial seal clamping ring, 9-window heat insulation pad, 10-window clamping ring, 11-box trim plate, 12-box heat insulation pad, 13-box heat insulation T-shaped sleeve, 14-heat control plate, 15-heat control shell, 16-Doppler difference interferometer component, 17-interferometer heat insulation T-shaped sleeve, 18-interferometer heat insulation pad, 19-heating plate heat insulation pad, 20-box vacuum interface, 21-box heating plate interface, 22-box thermistor interface.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
The device of the invention enables the interferometer component to work in the environment with low heat conduction, low heat convection and low heat radiation by designing the vacuum box body structure, the thermal control structure, the heat insulation measure and the like of the interferometer, and controls the temperature of the thermal control system to control the temperature passively, so that the temperature stability of the interferometer component is superior to the control precision of the temperature control system, the stable work of the interferometer component in the thermal control system is ensured, meanwhile, the interferometer component is installed in the thermal control system with high precision, the performance of an optical system is not influenced by the structure of the thermal control system, and the thermal control implementation is easy.
As shown in fig. 1 to 5, the thermal control device of the doppler difference interferometer with high thermal stability provided by the present invention includes a vacuum box 1, a box cover sealing ring 2, a box cover 3, a window axial sealing ring 4, a window glass 5, a window radial sealing ring 6, a window glass rubber gasket 7, a radial sealing pressing ring 8, a window heat insulating gasket 9, a window pressing ring 10, a box trimming plate 11, a box heat insulating gasket 12, a box heat insulating T-shaped sleeve 13, a thermal control plate 14, a thermal control housing 15, a doppler difference interferometer assembly 16, an interferometer heat insulating T-shaped sleeve 17, an interferometer heat insulating gasket 18, a heating plate heat insulating gasket 19, a box vacuum interface 20, a box heating sheet interface 21, and a box thermistor interface 22.
The box cover plate 3 is arranged above the vacuum box body 1 and forms a vacuum cavity with the vacuum box body 1; the vacuum box 1 is provided with window glass 5 for light inlet and light outlet, a box vacuum interface 20 for vacuum pumping, a box heating sheet interface 21 for connecting with a heating sheet, and a box thermistor interface 22 for connecting with a thermistor. The window glass 5 is axially pressed on the vacuum box body 1 through a window pressing ring 10, and a window glass rubber gasket 7 is arranged between the window glass 5 and the window pressing ring 10; a window heat insulation pad 9 is arranged between the vacuum box body 1 and the window pressing ring 10, and a window axial sealing ring 4 and a window radial sealing ring 6 are arranged on the contact surface of the vacuum box body 1 and the window glass 5, so that the vacuum box body 1 and the window glass 5 are sealed, and the window radial sealing ring 6 is pressed in through a radial sealing pressing ring 8; the thermal control shell 15 and the thermal control plate 14 are arranged in the vacuum cavity, and the Doppler differential interferometer assembly 16 is arranged in an installation cavity formed by the thermal control shell 15 and the thermal control plate 14; an interferometer heat insulation pad 18 is arranged between the Doppler difference interferometer assembly 16 and the thermal control plate 14, a heating plate heat insulation pad 19 is arranged between the thermal control plate 14 and the vacuum box body 1, a box body trimming plate 11 is arranged at the bottom end of the vacuum box body 1, a plurality of trimming bosses are arranged at the bottom end of the box body trimming plate 11, and a box body heat insulation pad 12 is further arranged between the box body trimming plate 11 and the vacuum box body 1.
The vacuum box body 1 is composed of a vacuum box body 1, a box body cover plate sealing ring 2, a box body cover plate 3, a window axial sealing ring 4, window glass 5, a window radial sealing ring 6, a window glass rubber gasket 7, a radial sealing pressing ring 8, a window heat insulation pad 9, a window pressing ring 10, a box body vacuum interface 20, a box body heating piece interface 21 and a box body thermistor interface 22, the two window glasses 5 of the vacuum box body 1 are respectively a light inlet and a light outlet, the box body vacuum interface 20 is used for being connected with a vacuum pump, the box body heating piece interface 21 and the box body thermistor interface 22 are interfaces with sealing performance, a heating piece and a thermistor are connected inside, and a temperature controller is connected outside. The plurality of heating fins are arranged at the bottom of the thermal control plate 14, the corresponding plurality of thermistors are arranged on the thermal control plate 14, the temperature of the thermal control plate 14 is fed back, and the temperature of the thermal control plate 14 is uniformly and stably controlled by controlling the output power of the heating fins.
The sizes of the vacuum box body 1 and the box body cover plate 3 are determined according to the interferometer component, a space required by thermal control implementation is reserved, and the thickness of the box body is larger than the minimum wall thickness t calculated by the box body0(t0＝0.224B/σBendWhere B is the length of the shortest side of the tank, σBendIs the bending strength of the material) to ensure the sealing performance and the vacuum maintaining performance of the vacuum chamber body 1. The sealing ring 2 of the cover plate of the box body is placed into a sealing groove of the vacuum box body 1, the vacuum box body 1 is in threaded connection with the cover plate 3 of the box body, the size of the sealing groove is related to the diameter of the sealing ring, and the sealing performance of the joint of the cover plate is ensured by compressing the cover plate sealing ring 2 of the box body up and down according to the vacuum sealing standard selection of the O-shaped ring.
The diameter of the window glass 5 is determined according to the clear aperture, the thickness is obtained through finite element optimization analysis, the deformation of the window glass 5 under the standard atmospheric pressure is calculated, the deformation of the window glass 5 is smaller than lambda/2 (wherein lambda is the wavelength of a detection spectral line), and the deformation of the window glass 5 is ensured not to influence the optical performance of the Doppler difference interferometer system. The window axial sealing ring 4 is placed in an axial sealing groove of the vacuum box body 1, after window glass 5 is placed, a radial sealing pressing ring 8 is used for plugging a window radial sealing ring 6 into the radial sealing groove, the window radial sealing ring 6 is pressed tightly, a window glass rubber pad 7 is placed to protect the outer surface of the window glass 5, a window heat insulation pad 9 and a window pressing ring 10 are placed in a window of the vacuum box body 1, and the window pressing ring 10 is screwed tightly by screws, so that the window axial sealing ring 4 is pressed tightly. The sizes of the sealing grooves of the window axial sealing ring 4 and the window radial sealing ring 6 are related to the diameter of the sealing rings, the window axial sealing ring 4 is axially compressed, and the window radial sealing ring 6 is radially compressed according to the O-shaped ring vacuum sealing standard selection, so that the sealing performance of the connecting part of the cover plate is ensured.
The inner surfaces of the vacuum chamber 1 and the chamber cover 3, and the internal structures are polished to reduce outgassing from the surfaces of the components in the vacuum chamber 1, increase the vacuum level, and reduce heat radiation.
The Doppler difference interferometer assembly 16, the thermal control plate 14 and the vacuum box body 1 are connected through screws and are separated by an interferometer heat insulation pad 18 and a heating plate heat insulation pad 19 respectively, and an interferometer heat insulation T-shaped sleeve 17 is arranged between the connecting screw and a mounting hole of the Doppler difference interferometer assembly 16.
The thermal control shell 15 is connected with the thermal control plate 14 through screws, the Doppler differential interferometer assembly 16 is covered inside, and heat conducting silicone grease is coated between contact surfaces to increase heat transfer, so that the temperature of the thermal control shell 15 is consistent with that of the thermal control plate 14, and the temperature around the Doppler differential interferometer assembly 16 is ensured to be uniform. In order to reduce the heat radiation of the surrounding parts to the doppler difference interferometer assembly 16, the inner and outer surfaces of the thermal control housing 15 are gold plated.
In order to ensure the installation accuracy of the doppler difference interferometer assembly 16 in the vacuum box 1, the thickness of the interferometer heat insulation pad 18 can be adjusted, and the verticality between the light incident surface and the light emitting surface of the doppler difference interferometer and the bottom surface of the vacuum box 1 is ensured. After the parallelism between the light incident surface and the light emitting surface of the doppler difference interferometer assembly 16 and the window surface of the vacuum box 1 is adjusted, the bottom plate of the doppler difference interferometer assembly 16, the thermal control plate 14 and the vacuum box 1 are punched with pin holes to position the doppler difference interferometer assembly 16, so that the resetting precision of the doppler difference interferometer assembly 16 after being disassembled in thermal control implementation is ensured.
The installation accuracy of the Doppler difference interferometer in the system light path is ensured by the installation accuracy of the vacuum box body 1 in the system light path. The vacuum box 1 is connected with a system installation base plate through screws, a box trimming plate 11 and a box heat insulation pad 12 are arranged between the vacuum box and the system installation base plate for separation, and a box heat insulation T-shaped sleeve 13 is arranged between the connecting screws and an installation hole of a Doppler difference interferometer assembly 16. The bottom surface of the vacuum box body 1 is ensured to be parallel to a system installation substrate by adjusting the angle between the surface of the lug boss of the box body trimming plate 11 and the bottom surface. The window center of the vacuum chamber 1 is made to coincide with the height of the optical path by adjusting the thickness of the chamber heat insulating pad 12. After the perpendicularity of incident light and emergent light and the window surface of the vacuum box body 1 is adjusted, the vacuum box body 1, the box body trimming plate 11 and the system installation base plate are provided with pin holes together, the vacuum box body 1 is positioned, and the resetting precision of the Doppler difference interferometer thermal control device which is installed again after being disassembled in the thermal control implementation process is guaranteed.
Thermal control of the doppler difference interferometer assembly 16 is performed by actively thermally controlling the thermal control plate 14. The thermal control plate 14 is separated from the vacuum box body 1 by a heating plate heat insulation pad 19, so that the influence of temperature fluctuation of the vacuum box body 1 on the temperature control precision of the thermal control plate 14 is reduced. The thermal control board 14 and the Doppler difference interferometer assembly 16 are separated by the interferometer heat insulation pad 18, so that the influence of temperature control fluctuation of the thermal control board 14 on the temperature stability of the Doppler difference interferometer assembly 16 is reduced, and the temperature stability of the Doppler difference interferometer assembly 16 is better than the temperature control precision. After the temperature control is implemented, the vacuum box body 1 component is wrapped by a heat insulation material (such as aerogel felt, a polyurethane foam board, glass fiber cotton felt and the like), the influence of the environmental temperature on the vacuum box body 1 component is reduced, and the temperature stability is improved. The optical window of the vacuum chamber 1 cannot be wrapped with insulation material and therefore is insulated with a window insulation blanket 9 and reduces heat conduction at the window. The box insulation blanket 12 and the box insulation tee 13 serve to reduce heat conduction from the system mounting substrate to the vacuum box 1.
Claims (10)
1. The utility model provides a high thermal stability doppler difference interferometer thermal control device which characterized in that: comprises a vacuum box body (1), a box body cover plate (3), a thermal control shell (15) and a thermal control plate (14);
the box body cover plate (3) is arranged above the vacuum box body (1) and forms a vacuum cavity with the vacuum box body (1); the vacuum box body (1) is provided with window glass (5) for light inlet and light outlet, a box body vacuum interface (20) for vacuumizing, a box body heating sheet interface (21) connected with a heating sheet, and a box body thermistor interface (22) connected with a thermistor;
the window glass (5) is axially pressed on the vacuum box body (1) through a window pressing ring (10), and a window glass rubber pad (7) is arranged between the window glass and the window pressing ring (10); a window heat insulation pad (9) is arranged between the vacuum box body (1) and the window pressing ring (10);
the thermal control shell (15) and the thermal control board (14) are arranged in the vacuum cavity, and the Doppler differential interferometer component (16) is arranged in an installation cavity formed by the thermal control shell (15) and the thermal control board (14); an interferometer heat insulation pad (18) is arranged between the Doppler difference interferometer assembly (16) and the thermal control plate (14), and a heating plate heat insulation pad (19) is arranged between the thermal control plate (14) and the vacuum box body (1);
the thermal control plate (14) is provided with a plurality of heating sheets and thermistors for heating and temperature feedback of the thermal control plate (14).
2. The thermal control apparatus of high thermal stability doppler differential interferometer according to claim 1, wherein: the bottom of vacuum box (1) is provided with box trim board (11), the bottom of box trim board (11) is provided with a plurality of trimming bosss.
3. The thermal control apparatus of high thermal stability doppler differential interferometer according to claim 2, wherein: a box body heat insulation pad (12) is arranged between the box body trimming plate (11) and the vacuum box body (1).
4. The thermal control apparatus of claim 3, wherein: the vacuum box body (1) is connected with the box body trimming plate (11) and the box body heat insulation pad (12) through screws, and a box body heat insulation T-shaped sleeve (13) is arranged between the screws and the mounting hole of the vacuum box body (1).
5. The thermal control device of the Doppler differential interferometer with high thermal stability according to any one of claims 1 to 4, wherein: the inner surfaces of the vacuum box body (1) and the box body cover plate (3) are polished surfaces, and gold-plated layers are arranged on the inner surface and the outer surface of the thermal control shell (15).
6. The thermal control device of high thermal stability doppler differential interferometer according to claim 5, wherein: the Doppler differential interferometer assembly (16), the thermal control plate (14) and the vacuum box body (1) are connected through screws, and an interferometer heat insulation T-shaped sleeve (17) is arranged between the screws and mounting holes of the Doppler differential interferometer assembly (16).
7. The thermal control apparatus of claim 6, wherein: the vacuum box is characterized in that a window axial sealing ring (4) and a window radial sealing ring (6) are arranged on the contact surface of the vacuum box body (1) and the window glass (5), and the window radial sealing ring (6) is pressed in through a radial sealing pressing ring (8).
8. The thermal control apparatus of claim 7, wherein: and a box cover plate sealing ring (2) is arranged between the vacuum box body (1) and the box cover plate (3).
9. The thermal control apparatus of claim 8, wherein: and heat-conducting silicone grease is arranged on the contact surface of the thermal control shell (15) and the thermal control plate (14), and heat-insulating materials are wrapped on the outer surfaces of the vacuum box body (1) and the box body cover plate (3).
10. The thermal control apparatus of high thermal stability doppler differential interferometer according to claim 9, wherein: the minimum wall thickness t of the vacuum box body (1)0＝0.224B/σBendWherein B is the length of the shortest side of the box body, sigmaBendIs the flexural strength of the material.
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| CN201910815919.9A CN110672556A (en) | 2019-08-30 | 2019-08-30 | Thermal control device of Doppler differential interferometer with high thermal stability |
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| CN201910815919.9A CN110672556A (en) | 2019-08-30 | 2019-08-30 | Thermal control device of Doppler differential interferometer with high thermal stability |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114113662A (en) * | 2021-10-29 | 2022-03-01 | 中国科学院西安光学精密机械研究所 | Long wave infrared Doppler difference interferometer grating assembly low temperature mounting structure |
| US11828689B2 (en) | 2020-10-29 | 2023-11-28 | Hand Held Products, Inc. | Apparatuses, systems, and methods for sample capture and extraction |
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| US11828689B2 (en) | 2020-10-29 | 2023-11-28 | Hand Held Products, Inc. | Apparatuses, systems, and methods for sample capture and extraction |
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Application publication date: 20200110 |