Small vacuum thermostat for measuring refractive index and temperature coefficient
By designing a small vacuum constant temperature device, adopting a lightweight refrigeration structure and an oxygen-free copper sample table, combined with liquid nitrogen storage refrigeration, the problem of large volume and lack of temperature change modules of the thermal vacuum test device is solved, and high efficiency of refractive index and temperature coefficient is achieved Measurement fills the gap in room temperature measurement and supports the measurement range from low to high temperature.
Patent Information
- Application Number
- CN202420808482.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-18
AI Technical Summary
Among the existing refractive index and temperature coefficient measurement devices, the thermal vacuum test device is more accurate than the vacuum constant temperature device, but it is larger in size, which increases the cost of the system structure and lacks the design of the temperature change module, so it is impossible to complete the low temperature to high temperature. The refractive index and temperature coefficient measurements.
A small vacuum constant temperature device was designed, using a lightweight refrigeration structure module and an oxygen-free copper sample table, combined with liquid nitrogen storage refrigeration, the refrigeration index and temperature coefficient measurement is achieved, and it supports -50℃-200℃ Large range of temperature regulation simplifies structure and reduces costs.
It realizes the measurement of refractive index and temperature coefficient with simple structure, convenient operation and low cost while ensuring measurement accuracy, fills the gap that is only suitable for normal temperature measurement in the prior art, and supports the measurement range from low to high temperature.
Smart Images
Figure CN222240349U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vacuum constant temperature, in particular to a small vacuum constant temperature device for measuring refractive index and temperature coefficient. Background Art
[0002] In the existing refractive index measurement technology, the most commonly used constant temperature control is a large vacuum chamber. For example, the structural design of NASA's CHARMS system in the United States installs the various components used for refractive index measurement in a large vacuum constant temperature chamber and seals them, and completes the measurement of the refractive index and temperature coefficient of infrared materials inside the large vacuum chamber. In this system, due to the requirements of the refractive index measurement principle on the deflection angle, when measuring large refractive index materials, the larger the deflection angle, the larger the vacuum structure size requirements, and the process of measuring the deflection angle requires the displacement of the reflector, which increases the difficulty and cost of the entire system structure. Some related domestic units, such as the Xi'an Institute of Applied Optics, also use large vacuum chambers to seal the entire measurement system to complete the measurement of the refractive index of infrared materials. In 2016, the American Institute of Standards and Technology and M3 Company improved the refractive index measurement method and adopted a concentric turntable structure to overcome the difficulty of the refractive index measurement method in limiting the spatial position size. However, the literature shows that it is only suitable for measurements at room temperature, and the variable temperature module is not designed, and the refractive index temperature coefficient from low temperature to high temperature cannot be completed. A paper published by Ningbo University in China in 2018 used a measurement structure similar to the one improved by M3 Company to measure the refractive index of some infrared materials. However, it was only used to measure the refractive index, no variable temperature system was designed, and the measurement of the temperature coefficient was not mentioned.
[0003] The application number is 201910425838.8, which discloses a thermal vacuum testing device in which a vacuum box is placed in a constant temperature box, including a constant temperature box, a vacuum box, a stainless steel bottom plate with trapezoidal grooves, a vacuum exhaust system, a magnetic fluid sealing shaft, a driving loading device and a workpiece to be measured. The vacuum box, the stainless steel bottom plate with trapezoidal grooves, the magnetic fluid sealing shaft, the driving loading device and the workpiece to be measured are all in the constant temperature box, the vacuum box, the driving loading device and the workpiece to be measured are arranged on the stainless steel bottom plate with trapezoidal grooves, the driving loading device is arranged outside the vacuum box, the workpiece to be measured is arranged inside the vacuum box, and the magnetic fluid sealing shaft is arranged between the vacuum box and the driving loading device, which is used to connect the workpiece to be measured in the vacuum box and the driving loading device outside the vacuum box. The present invention arranges the vacuum box, the driving loading device and the workpiece to be measured on the stainless steel bottom plate with trapezoidal grooves, does not require posture adjustment of each mounting platform, simplifies the adjustment mechanism and adjustment process, improves the system stiffness, and thus improves the test accuracy.
[0004] However, there are some shortcomings: the thermal vacuum test device used in this device is not as accurate as the vacuum constant temperature device for measuring the refractive index and temperature coefficient, and the thermal vacuum test device is larger in size, which increases the cost of the entire system structure. Utility Model Content
[0005] The purpose of the utility model is to provide a small vacuum thermostat for measuring refractive index and temperature coefficient, so as to solve the problem that the thermal vacuum test device used in the device proposed in the above background technology is not as accurate as the vacuum thermostat for measuring refractive index and temperature coefficient, and the thermal vacuum test device is large in size, which increases the cost of the entire system structure.
[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:
[0007] The utility model discloses a small vacuum constant temperature device for measuring refractive index and temperature coefficient, comprising a bottom plate, a vacuum structure is installed on the upper side of the bottom plate, a window structure is installed on the lower side of the vacuum structure, the vacuum structure comprises fixing bolts, a first fixing plate, a vacuum valve, a line aviation plug, a spare valve, a liquid nitrogen refrigeration outer tube, a liquid nitrogen refrigeration inner tube, a vacuum outer chamber, and a second fixing plate, fixing bolts are installed on the inner side of the bottom plate, a first fixing plate is installed on the outer side of the fixing bolts, and the first fixing plate is connected to the bottom plate through the fixing bolts.
[0008] Furthermore, a vacuum valve is installed on the upper side of the first fixed plate, a line aviation plug is installed on the upper side of the first fixed plate, and a spare valve is installed on the upper side of the first fixed plate.
[0009] Furthermore, a liquid nitrogen refrigeration outer tube is installed on the inner side of the first fixed plate, a liquid nitrogen refrigeration inner tube is installed on the lower side of the liquid nitrogen refrigeration outer tube, a vacuum outer chamber is installed on the outer side of the liquid nitrogen refrigeration inner tube, and a second fixed plate is installed on the lower side of the vacuum outer chamber.
[0010] Furthermore, the window structure includes a window column, an incident window, a first exit window, a second exit window, an upper sample stage, a first heating rod, a lower sample stage, a second heating rod, a sample prism, a first temperature sensor, and a second temperature sensor, and a window column is installed on the lower side of the second fixed plate.
[0011] Furthermore, an incident window is installed on the inner side of the window column, a first exit window is installed on the inner side of the window column, and a second exit window is installed on the inner side of the window column.
[0012] Furthermore, an upper sample stage is installed on the inner side of the window column, and a first heating rod is installed on the inner side of the upper sample stage.
[0013] Furthermore, a lower sample stage is installed on the inner side of the window column, and a second heating rod is installed on the inner side of the lower sample stage.
[0014] Furthermore, a sample prism is installed on the upper side of the lower sample stage.
[0015] Furthermore, a first temperature sensor is installed on one side of the sample prism, and a second temperature sensor is installed on a side of the sample prism away from the first temperature sensor.
[0016] Furthermore, the sample prism is installed on the lower side of the upper sample stage, and the first temperature sensor and the second temperature sensor are installed on the inner side of the window column.
[0017] The utility model has the following beneficial effects:
[0018] (1) The present invention takes into account the fact that the large vacuum constant temperature chamber used to control the sample temperature in the measurement device based on the minimum deviation angle measurement method of the refractive index in the prior art has a complex internal structure and high cost. Compared with the large chamber structure, the small vacuum chamber structure only retains the test sample temperature control module in the vacuum chamber. While ensuring the same measurement accuracy, there are no requirements for angles and sizes. It has a simple structure, easy operation and low cost. In addition, considering that the improved minimum deviation angle measurement scheme in the prior art has a simple structure and is easy to operate, but the existing literature indicates that it is only suitable for room temperature measurement, and no variable temperature system is designed for the refractive index temperature coefficient measurement. The small vacuum chamber scheme in the present invention provides an improved temperature control structure in the general minimum deviation angle method scheme, which is not only limited to the measurement of the refractive index at room temperature, but can also be used for the measurement of the refractive index temperature coefficient, filling the gap in related technical products.
[0019] (2) The utility model firstly carries out a lightweight design for the vacuum constant temperature device in the infrared material refractive index measuring device, and only places the refrigeration structure module in a small vacuum chamber, which greatly simplifies the structure of the internal components of the vacuum chamber, and the specified angle design window obtained by accurately calculating the prism deflection angle and the vertex angle uncertainty can complete the measurement of the refractive index and temperature coefficient in the refractive index range of 1.4 to 4.1. In addition, the sample stage independently designed inside the vacuum chamber is an oxygen-free copper structure, which ensures sufficient heat conduction efficiency while meeting the light aperture, and can meet the wide range of temperature regulation from low temperature to high temperature of -50℃-200℃. Finally, the refrigeration structure adopts liquid nitrogen storage refrigeration. The prior art usually adopts refrigerator refrigeration or liquid nitrogen flow heat exchange refrigeration. The refrigerator refrigeration structure and the liquid nitrogen flow heat exchange refrigeration structure are connected by pipelines, and will be entangled when rotating during the angle measurement process, so they are not applicable.
[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0023] Figure 2 It is a schematic diagram of the overall structure of the utility model;
[0024] Figure 3 It is a schematic diagram of the overall structure of the utility model;
[0025] Figure 4 This is an exploded view of the vacuum structure of the utility model;
[0026] Figure 5 for Figure 4 The enlarged schematic diagram of point A in the middle;
[0027] Figure 6 This is a top view of the window structure of the utility model;
[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0029] In the figure: 1, bottom plate; 2, vacuum structure; 3, window structure; 201, fixing bolt; 202, first fixing plate; 203, vacuum valve; 204, line aviation plug; 205, spare valve; 206, liquid nitrogen refrigeration outer tube; 207, liquid nitrogen refrigeration inner tube; 208, vacuum outer chamber; 209, second fixing plate; 301, window column; 302, incident window; 303, first exit window; 304, second exit window; 305, upper sample stage; 306, first heating rod; 307, lower sample stage; 308, second heating rod; 309, sample prism; 310, first temperature sensor; 311, second temperature sensor; DETAILED DESCRIPTION
[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0031] See also Figure 1-Figure 6As shown, the utility model is a small vacuum constant temperature device for measuring refractive index and temperature coefficient, comprising a base plate 1, a vacuum structure 2 is installed on the upper side of the base plate 1, a window structure 3 is installed on the lower side of the vacuum structure 2, the vacuum structure 2 comprises a fixing bolt 201, a first fixing plate 202, a vacuum valve 203, a line aviation plug 204, a spare valve 205, a liquid nitrogen refrigeration outer tube 206, a liquid nitrogen refrigeration inner tube 207, a vacuum outer chamber 208, and a second fixing plate 209, a fixing bolt 201 is installed on the inner side of the base plate 1, a first fixing plate 202 is installed on the outer side of the fixing bolt 201, and the first fixing plate 202 is connected to the base plate 1 through the fixing bolt 201.
[0032] A vacuum valve 203 is installed on the upper side of the first fixed plate 202 , a line aviation plug 204 is installed on the upper side of the first fixed plate 202 , and a backup valve 205 is installed on the upper side of the first fixed plate 202 .
[0033] A liquid nitrogen refrigeration outer tube 206 is installed on the inner side of the first fixed plate 202, a liquid nitrogen refrigeration inner tube 207 is installed on the lower side of the liquid nitrogen refrigeration outer tube 206, a vacuum outer chamber 208 is installed on the outer side of the liquid nitrogen refrigeration inner tube 207, and a second fixed plate 209 is installed on the lower side of the vacuum outer chamber 208.
[0034] The window structure 3 includes a window column 301, an incident window 302, a first exit window 303, a second exit window 304, an upper sample stage 305, a first heating rod 306, a lower sample stage 307, a second heating rod 308, a sample prism 309, a first temperature sensor 310, and a second temperature sensor 311. The window column 301 is installed on the lower side of the second fixed plate 209.
[0035] An incident window 302 is installed on the inner side of the window column 301 , a first exit window 303 is installed on the inner side of the window column 301 , and a second exit window 304 is installed on the inner side of the window column 301 .
[0036] An upper sample stage 305 is installed on the inner side of the window column 301 , and a first heating rod 306 is installed on the inner side of the upper sample stage 305 .
[0037] A lower sample stage 307 is installed on the inner side of the window column 301 , and a second heating rod 308 is installed on the inner side of the lower sample stage 307 .
[0038] A sample prism 309 is mounted on the upper side of the lower sample stage 307 .
[0039] A first temperature sensor 310 is installed on one side of the sample prism 309 , and a second temperature sensor 311 is installed on a side of the sample prism 309 away from the first temperature sensor 310 .
[0040] The sample prism 309 is installed on the lower side of the upper sample stage 305 , and the first temperature sensor 310 and the second temperature sensor 311 are installed on the inner side of the window column 301 .
[0041] When using it, first consider that the large vacuum constant temperature chamber used to control the sample temperature in the measurement device based on the minimum deflection angle measurement method of the prior art is complex in internal structure and high in cost. Compared with the large chamber structure, the small vacuum chamber structure only retains the test sample temperature control module in the vacuum chamber. Under the condition of ensuring the same measurement accuracy, there is no requirement for angle and size. It has a simple structure, easy operation and low cost. In addition, considering that the improved minimum deflection angle measurement scheme in the prior art has a simple structure and is easy to operate, the existing literature indicates that it is only suitable for room temperature measurement, and does not design the variable temperature system in the refractive index temperature coefficient measurement. The small vacuum chamber scheme in the utility model provides an improved temperature control structure in the general minimum deflection angle method scheme, which is not limited to the measurement of the refractive index at room temperature, but can be used to measure the refractive index temperature coefficient, filling the gap in related technical products. In addition, the utility model has carried out a lightweight design for the vacuum constant temperature device in the infrared material refractive index measuring device, and only places the refrigeration structure module in the small vacuum chamber, which greatly simplifies the structure of the internal components of the vacuum chamber, and the specified angle design window obtained by accurately calculating the prism deflection angle and the vertex angle uncertainty can complete the measurement of the refractive index and temperature coefficient in the refractive index range of 1.4 to 4.1, and the sample stage independently designed inside the vacuum chamber is an oxygen-free copper structure, which ensures sufficient heat conduction efficiency while meeting the light aperture, and can meet the wide range of temperature adjustment from low temperature to high temperature of -50℃-200℃. Finally, the refrigeration structure adopts liquid nitrogen storage refrigeration. In the prior art, refrigerator refrigeration or liquid nitrogen flow heat exchange refrigeration is usually adopted. The refrigerator refrigeration structure and the liquid nitrogen flow heat exchange refrigeration structure are connected by pipelines, and they will be involved when rotating during the angle measurement process, which is not applicable.
[0042] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A small vacuum thermostat for measuring refractive index and temperature coefficient, comprising a base plate (1), characterized in that: A vacuum structure (2) is installed on the upper side of the base plate (1), and a window structure (3) is installed on the lower side of the vacuum structure (2). The vacuum structure (2) comprises a fixing bolt (201), a first fixing plate (202), a vacuum valve (203), a line aviation plug (204), a spare valve (205), a liquid nitrogen refrigeration outer tube (206), a liquid nitrogen refrigeration inner tube (207), a vacuum outer chamber (208), and a second fixing plate (209). A fixing bolt (201) is installed on the inner side of the base plate (1), and a first fixing plate (202) is installed on the outer side of the fixing bolt (201). The first fixing plate (202) is connected to the base plate (1) via the fixing bolt (201).
2. A small vacuum constant temperature device for measuring refractive index and temperature coefficient according to claim 1, characterized in that: A vacuum valve (203) is installed on the upper side of the first fixed plate (202), a line aviation plug (204) is installed on the upper side of the first fixed plate (202), and a spare valve (205) is installed on the upper side of the first fixed plate (202).
3. A small vacuum constant temperature device for measuring refractive index and temperature coefficient according to claim 2, characterized in that: A liquid nitrogen refrigeration outer tube (206) is installed on the inner side of the first fixed plate (202), a liquid nitrogen refrigeration inner tube (207) is installed on the lower side of the liquid nitrogen refrigeration outer tube (206), a vacuum outer chamber (208) is installed on the outer side of the liquid nitrogen refrigeration inner tube (207), and a second fixed plate (209) is installed on the lower side of the vacuum outer chamber (208).
4. A small vacuum constant temperature device for measuring refractive index and temperature coefficient according to claim 1, characterized in that: The window structure (3) comprises a window column (301), an incident window (302), a first exit window (303), a second exit window (304), an upper sample stage (305), a first heating rod (306), a lower sample stage (307), a second heating rod (308), a sample prism (309), a first temperature sensor (310), and a second temperature sensor (311); the window column (301) is installed on the lower side of the second fixing plate (209).
5. A small vacuum constant temperature device for measuring refractive index and temperature coefficient according to claim 4, characterized in that: An incident window (302) is installed on the inner side of the window column (301), a first exit window (303) is installed on the inner side of the window column (301), and a second exit window (304) is installed on the inner side of the window column (301).
6. A small vacuum constant temperature device for measuring refractive index and temperature coefficient according to claim 5, characterized in that: An upper sample stage (305) is installed on the inner side of the window column (301), and a first heating rod (306) is installed on the inner side of the upper sample stage (305).
7. A small vacuum constant temperature device for measuring refractive index and temperature coefficient according to claim 6, characterized in that: A lower sample stage (307) is installed on the inner side of the window column (301), and a second heating rod (308) is installed on the inner side of the lower sample stage (307).
8. A small vacuum constant temperature device for measuring refractive index and temperature coefficient according to claim 7, characterized in that: A sample prism (309) is installed on the upper side of the lower sample stage (307).
9. A small vacuum constant temperature device for measuring refractive index and temperature coefficient according to claim 8, characterized in that: A first temperature sensor (310) is installed on one side of the sample prism (309), and a second temperature sensor (311) is installed on a side of the sample prism (309) away from the first temperature sensor (310).
10. A small vacuum constant temperature device for measuring refractive index and temperature coefficient according to claim 9, characterized in that: The sample prism (309) is installed on the lower side of the upper sample stage (305), and the first temperature sensor (310) and the second temperature sensor (311) are installed on the inner side of the window column (301).