Thermal radiation oven for calibrating batch parameters of alkali metal air chamber

Abstract

The invention discloses a thermal radiation oven for batch parameter calibration of alkali metal gas chambers, which realizes multichannel synchronous heating and real-time parameter measurement of alkali metal gas chambers with different shapes and specifications through combination of modular structural design and a precise temperature control strategy, and remarkably improves the efficiency and consistency of performance screening and parameter calibration of the gas chambers. Comprising a sealed heating cavity with a sealing cover, a bottom surface heating pipe fully paved on the bottom surface in a reciprocating folding manner and a cylindrical surface surrounding heating pipe fully paved on the cylindrical surface are arranged in the sealed heating cavity, and a heating frame bracket is arranged in the middle and is provided with a batch test alkali metal gas chamber sample bin; the batch test alkali metal gas chamber sample bin is connected with a positioning fine-tuning assembly with a micrometer caliper, the control end of the positioning fine-tuning assembly is located outside the sealed heating cavity, the execution end of the positioning fine-tuning assembly is located in the sealed heating cavity, and a gas chamber slot array is distributed on the upper surface of the batch test alkali metal gas chamber sample bin; a light through hole array penetrating through the rear side face is distributed on the front side face.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alkali metal cell detection and alkali metal cell thermal control, and particularly relates to a thermal radiation oven for batch parameter calibration of alkali metal cells. BACKGROUND

[0002] As the core sensitive element of a quantum sensor, the alkali metal cell directly affects the performance of the quantum sensor in terms of density distribution, temperature uniformity and stability of the alkali metal vapor inside the cell. Therefore, after the cell is prepared, systematic and batch calibration of its key parameters is necessary to ensure the performance consistency and repeatability of the quantum sensor. However, the existing heating oven scheme lacks a structure design for batch testing. The existing oven is mostly a single-cell structure, and lacks functional modules to support testing of multiple specifications of cells under the same temperature field and real-time temperature monitoring. In addition, due to the size limitation of the overall prototype, the existing oven has small size, uneven temperature field distribution, low thermal efficiency of traditional heat convection heating, and slow temperature response. While the non-magnetic electric heating method has high efficiency, it can easily cause temperature gradients inside the cell when performing multi-surface isothermal heating, affecting the uniformity of the alkali metal vapor density. Therefore, the present application proposes a thermal radiation oven for batch parameter calibration of alkali metal cells to achieve efficient, repeatable and scalable batch calibration of alkali metal cell parameters. The system significantly improves the temperature control uniformity and stability by optimizing the layout of heating elements, selecting high-reflectivity materials, using stainless steel shielding structures and a hierarchical vacuum system, providing key support for quality control and standardized testing in the industrialization process of quantum sensors.

[0003] The existing design scheme does not use a vacuum thermal radiation heating scheme.

[0004] The retrieved existing scheme disclosure files are as follows:

[0005] The first disclosed scheme is CN202110212838 - a multi-purpose alkali metal cell oven for efficient loading and unloading. The main technical feature of this prior art is that a combination structure of limiting grooves and limiting protrusions is provided between the oven and the peripheral components of the cell to realize efficient loading and unloading of the cell and reduce experimental adjustment time. However, the technical core of this prior art is focused on the convenience of loading and unloading, and no solution is given for the compatibility of diversified cells, temperature control accuracy, vacuum environment stability and batch parallel testing capability.

[0006] The second disclosed scheme is CN201910018569-A kind of uniform heating oven applied to atomic magnetometer, the prior art uses up and down symmetric heating structure and introduces light window piece, improves the heating efficiency of light transmission area, to improve the sensitivity of atomic magnetometer. But the design focus of this scheme still focuses on the uniformity regulation of local temperature field (especially the light transmission hole), and does not cover the problems of multi-sample synchronous testing and multi-form gas chamber adaptation, and the structure is fixed, which is not conducive to sample replacement and gas chamber parameter acquisition.

[0007] The third disclosed scheme is CN202211555673-A kind of heating device for SERF atom gas chamber, the prior art constructs closed liquid phase heat transfer environment through uniform heating liquid and composite insulation structure, and introduces inner and outer double-layer sealed cavity to realize heat balance and magnetic shielding performance improvement. Although this structure has certain advantages in temperature balance, its system relies on liquid immersion and multiple structures, which is large in size and complex in structure, not conducive to rapid sample replacement or batch testing, and difficult to realize compatible testing of multi-form samples. SUMMARY

[0008] To solve the problems of insufficient temperature control uniformity, lack of batch testing capability and weak vacuum heat radiation control capability of existing heating ovens, the present application proposes a heat radiation oven for batch parameter calibration of alkali metal gas chambers, which realizes multi-channel synchronous heating and real-time parameter measurement of alkali metal gas chambers of different shapes and specifications through the combination of modular structure design and precise temperature control strategy, significantly improving the efficiency and consistency of gas chamber performance screening and parameter calibration.

[0009] The technical solution of the present application is as follows:

[0010] A heat radiation oven for batch parameter calibration of alkali metal gas chambers, characterized in that it comprises a sealed heating cavity with a sealed cover, the sealed heating cavity has bottom surface heating pipes and cylindrical surface surrounding heating pipes in a reciprocating folding manner, the middle part of the sealed heating cavity is provided with a heating frame support, the batch test alkali metal gas chamber sample bin is arranged on the heating frame support, the batch test alkali metal gas chamber sample bin is connected with a positioning and fine adjustment assembly with a screw micrometer, the operating end of the positioning and fine adjustment assembly is located outside the sealed heating cavity, the executing end of the positioning and fine adjustment assembly is located inside the sealed heating cavity, the upper surface of the batch test alkali metal gas chamber sample bin is distributed with a gas chamber slot array, and the front side of the batch test alkali metal gas chamber sample bin is distributed with a through-hole array penetrating through the back side.

[0011] The sealed cover and the sealed heating cavity are sealed and connected through a bolt assembly array uniformly distributed along the circumferential edge.

[0012] A handle is arranged on the top surface of the sealed cover.

[0013] The outer peripheral surface waist part of the sealed heating cavity is provided with a plurality of spaced-apart air extraction interfaces, vacuum valves, sapphire window mirror groups and flange interfaces.

[0014] The gas chamber slot array is a spherical gas chamber slot array or a square gas chamber slot array.

[0015] The bottom of the batch testing alkali metal gas chamber sample bin is provided with a bottom positioning groove, and the inner surface of the batch testing alkali metal gas chamber sample bin is provided with a high-reflectivity coating to form a closed heat radiation environment.

[0016] The sidewall of the batch testing alkali metal gas chamber sample bin is provided with a sidewall temperature sensing hole.

[0017] A platinum resistance temperature sensor is arranged in the sidewall temperature sensing hole, and the platinum resistance temperature sensor is connected to a multi-point temperature monitoring and PID self-tuning control system.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] 1、The present application can realize batch heating and synchronous acquisition of temperature parameters of alkali metal gas chambers of different shapes and specifications, breaking through the limitations of traditional oven single sample testing.

[0020] 2、Solve the problem of poor applicability of traditional ovens in high uniformity and high vacuum heat radiation heating. By constructing a high-reflective vacuum radiation field, fine control of the gas chamber heating environment is realized, and the stability of the alkali metal vapor density distribution is improved, providing a reliable foundation for parameter calibration.

[0021] 3、The present application proposes a heat radiation oven for batch parameter calibration of alkali metal gas chambers, which can be used for batch testing of alkali metal gas chambers, performance screening of alkali metal gas chamber anti-relaxation coatings and other researches, providing key support for batch engineering production of high-performance quantum sensors, and promoting the standardization and modularization development of quantum sensing core devices.

[0022] The present application has the advantages of convenient structure disassembly and assembly, further meets the needs of batch calibration and quantitative testing, and proposes a modular sample bin design that can accommodate gas chambers of various shapes and sizes, supplemented by a vacuum heat radiation heating system and a multi-point temperature monitoring mechanism. Not only is the present application easy to disassemble and assemble, but also significantly improves the accuracy and repeatability of parameter measurement, solving the technical gap that only mechanical structure optimization cannot meet the performance calibration requirements.

[0023] The application adopts multiple groups of thermal radiation heating elements to build a closed uniform heating environment, combines a multi-channel temperature control system and a replaceable sample bin, ensures the three-dimensional uniformity of the temperature field space, realizes the full-process compatibility and integration of the alkali metal gas chamber in the processes of heating, testing and recording, and provides higher expansibility and flexibility for engineering batch testing.

[0024] The application innovatively adopts a vacuum cavity and a multi-surface thermal radiation mode, does not need liquid medium heat transfer, avoids sample pollution and maintenance problems, and realizes a more efficient and flexible parameter testing environment by cooperating with the modular design of the sample bin and the digital temperature control feedback, which takes into account the experimental accuracy and system maintainability, and is significantly superior to the applicability of the liquid heat transfer scheme in scientific research and engineering scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structure schematic diagram of a thermal radiation oven for batch parameter calibration of an alkali metal gas chamber.

[0026] Figure 2 is an internal structure schematic diagram of Figure 1 .

[0027] Figure 3 is a structure schematic diagram of a spherical alkali metal gas chamber sample bin.

[0028] Figure 4 is a structure schematic diagram of a square alkali metal gas chamber sample bin.

[0029] The reference signs are explained as follows: 1-sealed heating cavity; 2-sealed cover; 3-bolt assembly; 4-lifting handle; 5-pumping interface; 6-vacuum valve; 7-positioning fine adjustment assembly; 8-sapphire window mirror group; 9-flange interface; 10-oven base; 21-heating frame support; 22-batch testing spherical sample bin; 23-cylindrical surface surrounding heating pipe; 24-bottom heating pipe; 31-spherical gas chamber slot; 32-front light hole; 33-rear light hole; 34-side wall temperature sensing hole; 35-bottom positioning groove (for stably placing the batch testing spherical sample bin 22 on the heating frame support 21); 41-square gas chamber slot; 42-light hole; 43-multipoint temperature measurement hole; 44-bottom positioning groove (for stably placing the batch testing square sample bin on the heating frame support 21). DETAILED DESCRIPTION

[0030] The application will be described below in conjunction with the drawings Figures 1-4 and examples.

[0031] Figure 1 is a structure schematic diagram of a thermal radiation oven for batch parameter calibration of an alkali metal gas chamber. Figure 2 is an internal structure schematic diagram of Figure 1 .Figure 3 This is a schematic diagram of the spherical alkali metal gas chamber sample compartment. Figure 4 This is a schematic diagram of a square alkali metal gas chamber sample compartment. (Reference) Figures 1 to 4 As shown, a thermal radiation oven for batch parameter calibration of alkali metal gas chambers includes a sealed heating cavity 1 with a sealing cover 2. The sealed heating cavity 1 has bottom heating tubes 24 arranged in a reciprocating folding manner covering the bottom surface and cylindrical surrounding heating tubes 23 arranged in a reciprocating folding manner covering the cylindrical surface. A heating frame support 21 is provided in the middle of the sealed heating cavity 1. A batch testing alkali metal gas chamber sample chamber 22 is provided on the heating frame support 21. The batch testing alkali metal gas chamber sample chamber 22 is connected to a positioning fine-tuning component 7 with a micrometer screw gauge. The operating end of the positioning fine-tuning component 7 is located outside the sealed heating cavity 1, and the actuating end of the positioning fine-tuning component 7 is located inside the sealed heating cavity 1. The upper surface of the batch testing alkali metal gas chamber sample chamber 22 is distributed with an array of gas chamber slots (e.g., Figure 3 The five spherical air chamber slots 31, or Figure 4 The sample chamber 22 for batch testing of alkali metals has 10 square gas chamber slots 41, and the front side of the sample chamber 22 has an array of light-transmitting holes that extend to the rear side (e.g., ...). Figure 3 The five front light-transmitting holes 32 and the five rear light-transmitting holes 33, or Figure 4 The 10 light-transmitting holes (42) in the middle.

[0032] The sealing cover 2 and the sealing heating cavity 1 are connected by an array of bolt assemblies evenly distributed along the circumferential edge (e.g., Figure 1 The four bolt assemblies 3) are sealed together. A handle 4 is provided on the top surface of the sealing cover 2. The outer circumference of the sealed heating chamber 1 is provided with spaced-apart evacuation ports 5, vacuum valves 6, sapphire window mirror assemblies 8, and flange interfaces 9. The gas chamber slot array is a spherical gas chamber slot array (e.g., Figure 3 Five spherical gas chamber slots 31) or an array of square gas chamber slots (e.g.) Figure 4 The sample chamber 22 for batch testing of alkali metals has 10 square gas chamber slots 41. The bottom of the sample chamber 22 is provided with a bottom positioning groove (e.g., ...). Figure 3 The bottom positioning groove 35, or Figure 4 The bottom positioning groove 44 in the bottom of the sample chamber 22 for batch testing of alkali metals is provided with a high reflectivity coating on the inner surface to form a closed thermal radiation environment. The side wall of the sample chamber 22 for batch testing of alkali metals is provided with a side wall temperature sensing hole 34 (or Figure 4 The multi-point temperature measuring hole 43 is located in the side wall temperature sensing hole 34. A platinum resistance temperature sensor is installed in the side wall temperature sensing hole 34. The platinum resistance temperature sensor is connected to the multi-point temperature monitoring and PID self-tuning control system (PID is proportional-integral-derivative).

[0033] The technical scheme of the application relates to a heat radiation oven for batch parameter calibration of alkali metal gas chambers, which comprises a vacuum sealed heating cavity, a heat radiation heating module and a batch test sample bin.

[0034] The vacuum sealed heating cavity adopts a vacuumizable stainless steel sealed cavity, has excellent heat radiation shielding capacity, and realizes a high vacuum environment through combination of a mechanical pump and a molecular pump, so as to effectively inhibit the interference of air convection on the temperature field.

[0035] The heat radiation heating module is arranged with multiple groups of annular or planar heating pipes inside the cavity, is uniformly distributed around the sample bin, forms a closed heat radiation environment in combination with a high reflectivity coating of the inner wall, and realizes uniform heating.

[0036] The batch test sample bin structure is designed to have multiple specifications of replaceable sample bins, can simultaneously accommodate multiple gas chambers of different sizes or structures, realizes parallel heating test of multiple samples, and is provided with an independent temperature sensing unit for obtaining the body temperature information of each gas chamber.

[0037] The multi-point temperature monitoring and control system integrates a high-precision platinum resistance temperature sensor and a PID self-tuning control system, supports multi-channel real-time monitoring and partition independent temperature control, can effectively reduce temperature fluctuation, and improves the consistency and repeatability of parameter calibration.

[0038] The oven provides a uniform temperature field through heat radiation, guarantees that the temperature difference between samples is controlled within a range of ±0.05 DEG C through multi-point temperature control feedback, effectively improves the repeatability and consistency of quantitative parameter measurement of the gas chamber, has the advantages of modular structure, universal sample type and high temperature control precision, and is widely applicable to scenes such as process evaluation, performance screening and engineering batch detection of alkali metal gas chambers in quantum sensors.

[0039] Figure 1 is an appearance structure schematic diagram of the oven for batch parameter calibration of alkali metal gas chambers, Figure 2 is an internal structure schematic diagram of the oven for batch parameter calibration of alkali metal gas chambers, Figure 3 is Figure 2 is a spherical alkali metal gas chamber sample bin structure schematic diagram. Figure 4 is Figure 2 is a batch test square sample bin structure schematic diagram.

[0040] As Figure 1As shown, the whole oven mainly includes: a sealed heating cavity (1): the main body of the overall heating area, composed of high-strength stainless steel material, with excellent vacuum sealing and heat reflection characteristics. The sealing cover (2): connected with the cavity through the bolt assembly (3), cooperated with the sealing washer to realize high vacuum closure, provided with a handle (4) for opening and closing. The positioning fine adjustment assembly (7): the internal sample bin position can be fine adjusted through the screw micrometer to ensure the detection accuracy. The air exhaust interface (5) and the vacuum valve (6): connect the vacuum system to maintain a high vacuum environment. The sapphire window mirror group (8): sapphire can ensure high laser transmittance, and the window mirror provides a path for the laser. The laser is incident through the entrance window mirror, passes through the alkali metal cell, and is emitted through the exit window mirror. By measuring the light intensity change of the incident and emitted laser in real time, the relevant calibration parameters of the alkali metal cell can be obtained. The flange interface (9): used for electrical lead-out of temperature sensor, heating power supply, etc. The oven base (10): provides stable support and is provided with a strip-shaped fixing hole for easy installation.

[0041] As shown in Figure 2 , the heating module of the alkali metal cell in the oven internal structure includes: a heating frame support (21): used for fixing the overall structure to ensure the stability of the heating element and the sample. Batch test spherical sample bin (22): a plurality of equidistant circular holes are provided on the central mounting plate for fixing the spherical gas chamber sample to realize batch parallel test. Cylindrical surface around heating pipe (23): made of high-temperature alloy material into a ring array to ensure 360° thermal radiation and high heating uniformity. Bottom heating pipe (24): used for bottom surface thermal radiation heating to increase thermal uniformity and fix the position of the heating coil to prevent structural displacement caused by thermal stress. This structure heats the spherical sample by thermal radiation, avoiding the thermal unevenness caused by direct contact, and is suitable for testing of high-sensitivity quantum sensor alkali metal cells.

[0042] As shown in Figure 3 , the detailed structure of the spherical alkali metal cell sample bin, the whole is made of high-thermal-conductivity ceramic, which is resistant to high temperature and has small thermal inertia. It includes: spherical cell slot (31): five semispherical slots are equidistantly provided to ensure the stability of the cell nesting. Front light hole (32): five light holes are equidistantly provided for detecting the incidence of laser. Rear light hole (33): five light holes are equidistantly provided and horizontally aligned with the front light hole for detecting the emission of laser. Side wall temperature sensing hole (34): used for inserting a thermocouple or platinum resistance for real-time monitoring of local sample temperature. Bottom positioning groove (35): for stable placement of the sample bin in the heating frame. The sample bin and the positioning fine adjustment assembly (7) are fixed by screws, and the laser can pass through different cells by adjusting the screw micrometer to realize batch calibration and testing of alkali metal cells under the same uniform temperature field.

[0043] As shown in Figure 4As shown, the detailed structure of the square sample chamber for batch testing also uses high thermal conductivity ceramic material. It includes: square gas chamber slots (41): ten square slots are equidistantly spaced. Light-transmitting holes (42): ten light-transmitting holes are equidistantly spaced, and these holes are through holes. Figure 3 The front light-transmitting hole (32) is similar to the rear light-transmitting hole (33) and is used to detect the passage of laser light. Multi-point temperature measuring hole (43): used for multi-position temperature detection, which is convenient for evaluating the uniformity of the thermal field. Compared with the spherical sample chamber, this square structure is suitable for MEMS gas chambers, small columnar gas chambers, etc., to meet the needs of scientific research and engineering batch calibration. Bottom positioning groove (44): facilitates the stable placement of the sample chamber in the heating frame. The sample chamber and the positioning fine-tuning component (7) are fixed with screws. By adjusting the micrometer screw, the laser can pass through different gas chambers to achieve batch calibration and testing of alkali metal gas chambers under the same uniform temperature field.

[0044] Contents not described in detail in this specification are prior art known to those skilled in the art. It is hereby indicated that the above description is intended to help those skilled in the art understand this invention, but does not limit the scope of protection of this invention. Any equivalent substitutions, modifications, improvements, and / or simplifications of the above descriptions that do not depart from the essential content of this invention fall within the scope of protection of this invention.

Claims

1. A thermal radiation oven for batch parameter calibration of an alkali metal cell, characterized in that The application relates to a sealed heating cavity with a sealed cover, a bottom-surface heating tube with a bottom-surface in a reciprocating folding mode and a cylindrical-surface surrounding heating tube with a cylindrical-surface in a reciprocating folding mode in the sealed heating cavity, a heating frame support arranged in the middle of the sealed heating cavity, a batch test alkali metal gas chamber sample bin arranged on the heating frame support, a positioning fine adjustment assembly with a screw micrometer connected to the batch test alkali metal gas chamber sample bin, an operating end of the positioning fine adjustment assembly located outside the sealed heating cavity, an executing end of the positioning fine adjustment assembly located inside the sealed heating cavity, an array of gas chamber groove positions distributed on the upper surface of the batch test alkali metal gas chamber sample bin, and an array of light transmission holes penetrating through the front side of the batch test alkali metal gas chamber sample bin.

2. The heat radiation oven for batch parameter calibration of alkali metal cell according to claim 1, characterized in that, The sealed cover is sealed and connected with the sealed heating cavity through an array of bolt assemblies uniformly distributed along the circumferential edge.

3. The heat radiation oven for batch parameter calibration of alkali metal cell according to claim 1, characterized in that, A handle is arranged on the top surface of the sealed cover.

4. The heat radiation oven for batch parameter calibration of alkali metal cell according to claim 1, characterized in that, A plurality of spaced-apart air extraction interfaces, vacuum valves, sapphire window mirror groups and flange interfaces are arranged on the waist of the outer circumferential surface of the sealed heating cavity.

5. The heat radiation oven for batch parameter calibration of alkali metal cell according to claim 1, characterized in that, The array of gas chamber groove positions is an array of spherical gas chamber groove positions or an array of square gas chamber groove positions.

6. The heat radiation oven for batch parameter calibration of alkali metal cell according to claim 1, wherein, A bottom positioning groove is arranged on the bottom of the batch test alkali metal gas chamber sample bin, and a high-reflectivity coating is arranged on the inner surface of the batch test alkali metal gas chamber sample bin to form a closed heat radiation environment.

7. The heat radiation oven for batch parameter calibration of alkali metal cell according to claim 1, wherein, A sidewall temperature sensing hole is arranged on the sidewall of the batch test alkali metal gas chamber sample bin.

8. The heat radiation oven for batch parameter calibration of an alkali metal cell according to claim 7, wherein A platinum resistance temperature sensor is arranged in the sidewall temperature sensing hole, and the platinum resistance temperature sensor is connected with a multi-point temperature monitoring and PID self-tuning control system.

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