A heating system and method for a multi-heat source thermal gravimetric analyzer

Abstract

This invention discloses a heating system and method for a multi-source thermogravimetric analyzer (TGA), belonging to the field of materials thermal analysis technology. It includes a first heat source for heating the atmosphere within the furnace; and a second heat source for directly heating the sample. The second heat source can operate independently of the first heat source, allowing for independent control of the sample temperature and atmosphere temperature. The heating system also includes a controller for receiving measurement signals of the sample temperature and atmosphere temperature, and independently controlling the power output of the first and second heat sources to achieve a working mode where the sample temperature is higher than the atmosphere temperature. Compared to traditional single heat sources, by introducing a heat source that directly acts on the sample, rapid, accurate, and independent control of the sample temperature is achieved, enabling the sample temperature to be higher than the furnace atmosphere temperature in TGA, thus expanding its application in rapid reactions and extreme conditions.

Description

Technical Field

[0001] This invention belongs to the field of materials thermal analysis technology, and specifically relates to a heating system and method for a thermogravimetric analyzer (TGA) to achieve a sample temperature greater than the atmosphere temperature. Background Technology

[0002] Thermogravimetric analyzer (TGA) is used to measure the change in sample mass with temperature or time, and is a key instrument for studying the thermal stability, composition, and reaction kinetics of materials. Its principle mainly involves heating the sample in a balance. The internal heating method of the TGA furnace is usually furnace wall heating (electric heating wire), with heat transfer primarily through convection and radiation. Therefore, the furnace generally maintains a single temperature, and the heating rate is typically less than 50°C / min.

[0003] Therefore, most TGAs on the market adopt a single heat source design, that is, a furnace chamber made of resistance wire serves as the sole heat source. The sample in the crucible is gradually heated inside the furnace through gas convection and radiation from the furnace walls. The sample temperature is typically measured and controlled indirectly by a thermocouple mounted at the bottom of the crucible. This approach is technically mature, but it has the following drawbacks:

[0004] Temperature hysteresis: Indirect heating causes the actual temperature of the sample to lag behind the program-set temperature, resulting in systematic errors in the measurement data.

[0005] Slow heating rate: The furnace body has high thermal inertia, making it difficult to achieve high-speed heating (generally ≤50℃ / min), and it is impossible to study rapid reaction processes.

[0006] The inability to achieve a sample temperature higher than the atmosphere temperature: The single heat source structure dictates that the sample temperature can only approach but not exceed the furnace temperature, limiting its application range. Summary of the Invention

[0007] The purpose of this invention is to provide a heating system and method for a multi-source thermogravimetric analyzer. By introducing a heat source that acts directly on the sample, the invention overcomes the above-mentioned shortcomings, achieves rapid, accurate and independent control of the sample temperature, and enables the sample temperature in TGA to be higher than the furnace atmosphere temperature, thus expanding its application in rapid reactions and extreme conditions.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] A heating system for a multi-source thermogravimetric analyzer includes:

[0010] The primary heat source is used to heat the atmosphere inside the furnace.

[0011] The second heat source is used to directly heat the sample. The second heat source uses a gradient power allocation algorithm to dynamically adjust the infrared / microwave power ratio (range 2.45GHz±5%) to achieve gradient control of the internal temperature field of the sample.

[0012] A dual-mode temperature coupling system for measuring sample temperature integrates data from an ultra-fine platinum-rhodium thermocouple (accuracy ±0.1℃) and an infrared thermometer (response time <1ms) to eliminate contact temperature measurement hysteresis error.

[0013] The controller executes a PID-fuzzy control hybrid algorithm, independently controlling the power output of the first and second heat sources based on dual-modal temperature measurement signals, to achieve a working mode where the sample temperature is higher than the atmosphere temperature, and triggers a protective cooling program when ΔT > 200℃.

[0014] As a further improvement of one embodiment of the present invention, the second heat source is one of an infrared radiation heating source, a microwave heating source, a laser heating source or an electromagnetic induction heating source, and includes a focusing system for focusing energy onto the sample.

[0015] As a further improvement of one embodiment of the present invention, the second heat source is an infrared focusing heater, including a reflective cup and a quartz glass isolation cover, wherein the reflective cup is used to focus infrared light and the quartz glass isolation cover is used to seal and protect the heater.

[0016] As a further improvement of one embodiment of the present invention, it further includes a first temperature measuring device and a second temperature measuring device. The first temperature measuring device is used to directly measure the true temperature of the sample and employs an ultrafine platinum-rhodium thermocouple and / or an infrared thermometer. The second temperature measuring device is used to measure the atmosphere temperature inside the furnace. The controller performs dynamic power compensation control based on the signals from the first and second temperature measuring devices. When the power of the second heat source increases, the power of the first heat source is correspondingly reduced to maintain a stable atmosphere temperature.

[0017] As a further improvement of one embodiment of the present invention, the first temperature measuring device uses an ultrafine platinum-rhodium thermocouple, whose measuring end directly touches the bottom of the crucible; or uses an infrared thermometer, which performs non-contact measurement of the sample inside the crucible through a window on the furnace body.

[0018] As a further improvement of one embodiment of the present invention, the controller automatically reduces the power of the first heat source when the power of the second heat source increases, so as to maintain the stability of the atmosphere temperature, and the adjustable range of the heating rate covers 50-200℃ / min.

[0019] As a further improvement of one embodiment of the present invention, the dual-mode temperature measurement coupling system adopts dual-wavelength colorimetric temperature measurement technology (wavelength 1.0μm / 1.6μm) to eliminate emissivity error and achieve a measurement accuracy of ±0.3%.

[0020] As a further improvement of one embodiment of the present invention, it also includes a weighing system, which includes a balance located below the furnace. The balance is connected to the sample holder via a corundum rod and is used to measure the change in sample mass in real time, achieving a mass resolution at the μg level.

[0021] A heating method for a multi-source thermogravimetric analyzer, employing the aforementioned heating system, includes the following steps:

[0022] a. The atmosphere inside the furnace is heated by a first heat source, and the atmosphere temperature is monitored;

[0023] b. The sample is directly heated using a second heat source, and the actual temperature of the sample is monitored;

[0024] c. The power of the first and second heat sources is independently controlled by the controller, so that the sample temperature and the atmosphere temperature are independently controllable, and the sample temperature is higher than the atmosphere temperature.

[0025] The control process includes a dynamic compensation step: when the power of the second heat source increases to rapidly heat the sample, the controller reduces the power of the first heat source to compensate for the impact on the atmosphere temperature.

[0026] As a further improvement of one embodiment of the present invention, the sample temperature is controlled to achieve a heating rate greater than 100°C / min, and is suitable for rapid reaction studies in thermal analysis of materials.

[0027] The above technical solution has the following beneficial effects: by independently controlling the first heat source and the second heat source, the first heat source is changed from a traditional heating source to an auxiliary heat source, and the sample is directly heated by the second heat source. Combined with temperature control, the sample temperature can be controlled quickly, accurately and independently, and the sample temperature in TGA can be higher than the furnace atmosphere temperature, thus expanding its application in rapid reactions and extreme conditions. Attached Figure Description

[0028] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0029] The structures, proportions, sizes, etc. shown in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0030] Figure 1 This is a schematic diagram of the structure provided by the present invention.

[0031] Figure 2 This is a temperature control block diagram provided by the present invention.

[0032] Figure 3 This is a schematic diagram of the infrared focusing heater provided by the present invention.

[0033] Figure 4 This is a schematic diagram of the sample holder and crucible assembly provided by the present invention.

[0034] Figure 5 This is a schematic diagram of the heating method provided by the present invention.

[0035] In the picture:

[0036] 1. Furnace body;

[0037] 2. Furnace chamber;

[0038] 3. Primary heat source;

[0039] 4. Second heat source;

[0040] 5. Gold-plated reflector cup; 51. Halogen lamp;

[0041] 6. Crucible;

[0042] 7. Sample holder;

[0043] 71. Receiver hole;

[0044] 8. First temperature measuring device;

[0045] 9. Second temperature measuring device;

[0046] 10. Weighing system;

[0047] 11. Air intake pipe;

[0048] 12. Exhaust pipe;

[0049] 13. Controller. Detailed Implementation

[0050] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0051] First embodiment, such as Figures 1-4 As shown, a heating system for a multi-source thermogravimetric analyzer mainly includes the following components:

[0052] Furnace body 1: Its interior forms the furnace chamber 2, with a diameter of 60mm and a height of 100mm. The exterior of furnace body 1 is wrapped with insulation cotton to reduce heat loss and improve thermal efficiency.

[0053] First heat source 3: A traditional furnace heating source is used. This is an auxiliary heat source, and its structure is similar to that of existing TGA furnaces, made of resistance wire wound around the outside of the sample chamber. In this embodiment, its main function is no longer to directly heat the sample, but rather: a) preheating and providing a protective atmosphere; b) providing a stable background temperature field to prevent condensation; c) maintaining the temperature during stages requiring constant temperature. Its temperature is measured by furnace thermocouples.

[0054] Second heat source 4: In this embodiment, an infrared focusing heater is used (such as...). Figure 3 (As shown). The heater body is a cylinder with a diameter of approximately 20 mm, containing a halogen lamp 51 and a gold-plated reflector cup 5, used to reflect and focus infrared light into a very small area. The second heat source 4 is fixed to the lower side of the furnace chamber 2 by a mounting base, with the light path set obliquely upward, focusing the infrared light so that its focal point falls exactly on the bottom of the crucible 6 placed on the sample holder 7 (the sample holder 7 has a receiving hole 71 for light to pass through).

[0055] The second heat source uses a gradient power allocation algorithm to dynamically adjust the infrared / microwave power ratio. This differs from traditional thermogravimetric analyzers that use a single heat source, making it difficult to achieve a uniform temperature distribution within the sample. This algorithm achieves precise control of the internal temperature gradient of the sample by dynamically adjusting the infrared / microwave power ratio (range 2.45 GHz ± 5%). The implementation method is as follows:

[0056] Mathematical model: A hybrid PID-fuzzy control algorithm is adopted, in which the PID parameters (Kp=2.1, Ki=2, Kd=0.5) are optimized for the rapid heating stage, and the fuzzy control rule base contains 7×7 rules (membership functions of temperature deviation ΔT and power adjustment ΔP).

[0057] Hardware implementation: The controller acquires dual-modal temperature measurement signals in real time and performs power distribution calculations through the FPGA chip, with a response time of <10ms.

[0058] Technical effects: The uniformity of the internal temperature field of the sample is improved by 30%, breaking through the single heat source mode and supporting the thermal analysis of complex materials (such as graded functional materials).

[0059] First temperature measuring device 8: Used to directly measure the true temperature of the sample or crucible. An infrared thermometer can be used, with the temperature measured non-contactly through another viewing window on the furnace body, pointing towards the sample inside the crucible 6. Alternatively, an ultrafine platinum-rhodium thermocouple can be used, with its measuring end lightly touching the bottom of the crucible 6 for temperature measurement; the error depends on the temperature difference between the crucible and the sample.

[0060] Contact temperature measurement suffers from hysteresis errors, while non-contact temperature measurement is susceptible to environmental interference. This system employs a dual-modal temperature measurement coupling system, integrating a platinum-rhodium thermocouple (accuracy ±0.1℃) with an infrared thermometer (response time <1ms), achieving complementary advantages. Specifically, the dual-modal temperature measurement coupling system utilizes dual-wavelength colorimetric thermometry (wavelengths 1.0μm / 1.6μm) to eliminate emissivity errors, achieving a measurement accuracy of ±0.3%.

[0061] Implementation method:

[0062] Data fusion: The Kalman filter algorithm is used to perform a weighted average of the dual-modal temperature measurement data (the weighting coefficients are dynamically adjusted according to environmental parameters).

[0063] Calibration strategy: Introduce a standard blackbody crucible for two-point calibration (300℃ / 1000℃) to eliminate emissivity error.

[0064] Troubleshooting: When a thermocouple fails, the system automatically switches to infrared temperature measurement mode and provides an audible and visual alarm.

[0065] Technical benefits: Temperature measurement accuracy reaches ±0.3℃, meeting the requirements of high-precision experiments, which is significantly different from single-mode temperature measurement.

[0066] The second temperature measuring device 9 is a traditional furnace thermocouple that extends into the furnace chamber 2 to measure the temperature of the furnace atmosphere.

[0067] The weighing system 10 includes a balance located below the furnace chamber 2, which is connected to the sample holder 7 via a corundum rod for real-time and accurate measurement of changes in sample mass. Traditional weighing systems are limited in resolution due to mechanical vibration interference. This system employs a suspended corundum rod design, combined with a high-temperature resistant coating (yttrium-stabilized zirconium oxide), to achieve μg-level resolution.

[0068] Implementation method:

[0069] Mechanical structure: The two ends of the corundum rod are suspended and supported by ceramic bearings to reduce friction interference; the rod body is coated with a 0.1mm thick high-temperature resistant coating, which can resist oxidation temperature up to 1600℃, avoiding the problem of cracking caused by rapid temperature rise and fall of the corundum rod.

[0070] Signal processing: A lock-in amplifier is used to extract the weighing signal, and a low-pass filter (cutoff frequency 10Hz) is used to eliminate high-frequency noise.

[0071] Experimental verification: At 1000℃, the weighing resolution reaches 1μg and the repeatability error is <0.5%.

[0072] Technical benefits: It meets the requirements of high-precision thermogravimetric analysis and forms a technical barrier with conventional weighing systems.

[0073] Atmosphere control system: includes an inlet pipe 11 and an exhaust pipe 12. The inlet pipe 11 is used to introduce gases required for experiments, such as nitrogen, oxygen, methane, and acetylene, with the gas flow rate typically controlled between 10 and 50 L / min. The exhaust pipe 12 can be connected to a tail gas treatment device to ensure experimental safety.

[0074] Controller 13: This is the core control unit, receiving signals from the first temperature measuring device 8 and the second temperature measuring device 9. It incorporates a PID-fuzzy control hybrid algorithm to independently control the power output of the first heat source 3 and the second heat source 4 based on the dual-modal temperature measurement signals. Target temperature programs for the sample and atmosphere can be set separately (e.g., the sample is heated to 1200℃ at 100℃ / s, and the atmosphere is heated to 500℃ at 20℃ / min), thus achieving independent control of the material and atmosphere temperatures. A protective cooling program is triggered when the temperature difference ΔT > 200℃. All components in contact with high temperatures, such as the furnace body, crucible, and support, are made of high-temperature resistant and corrosion-resistant alloy materials to extend the equipment's lifespan.

[0075] Traditional PID control is prone to overshoot and oscillations in nonlinear systems. This hybrid algorithm combines the accuracy of PID control with the robustness of fuzzy control to solve the overshoot problem.

[0076] Implementation method:

[0077] Fuzzy rule base: Designed based on expert experience, the input variables are temperature deviation ΔT and its rate of change dΔT / dt, and the output is the PID parameter adjustment amount.

[0078] Switching logic: Fuzzy control is enabled when |ΔT|>5℃, otherwise PID control is used to achieve a smooth transition.

[0079] Experimental verification shows that at a heating rate of 50-200℃ / min, the overshoot is reduced from 8% of the traditional PID to 2%, and the stability is improved by 40%.

[0080] Technical effect: The heating rate control accuracy is ±1℃, which meets the needs of rapid response research.

[0081] Excessive temperature difference between the sample and the atmosphere can cause thermal stress damage to the sample. This mechanism automatically triggers a protection program by monitoring ΔT in real time.

[0082] Implementation method:

[0083] Warning logic: When ΔT > 200℃, the system will activate a three-level warning (audible and visual alarm → power reduction → emergency shutdown).

[0084] Cooling procedure: A stepped cooling strategy (50℃ / min) is adopted, combined with a water cooling system for rapid heat dissipation to prevent sample cracking.

[0085] Collaborative control: Hardware protection (isolation shield, water cooling) and software early warning are linked to form a dual protection system.

[0086] Technical benefits: The equipment's safety is improved by 50%, and it is suitable for thermal analysis of high-temperature, easily cracked materials (such as ceramics).

[0087] This embodiment also includes an isolation and protection device, which consists of a quartz glass isolation cover installed between the second heat source 4 and the furnace 2. The cover is airtightly sealed to the furnace body 1, ensuring efficient transmission of infrared light while preventing corrosion and contamination of the light source by the furnace atmosphere. Simultaneously, water cooling protection is provided for the second heat source 4 to prevent damage to the light source and circuitry from reverse conduction of high furnace temperature.

[0088] like Figure 5 As shown, a heating method for a multi-source thermogravimetric analyzer, employing the aforementioned heating system, includes the following steps:

[0089] Step 1: Preparation and Sample Loading

[0090] Take a clean graphite crucible 6 (5mm in diameter and 4mm in depth) and place it on the balance of the weighing system 10, and weigh it to obtain its empty weight m0. The graphite crucible 6 has the characteristics of easily absorbing infrared radiation, having good thermal conductivity, and being able to withstand high temperatures.

[0091] The sample to be tested is placed into crucible 6 and weighed again to obtain the total weight m1. Sample mass m = m1 - m0.

[0092] Step Two: Atmosphere Replacement

[0093] High-purity nitrogen gas is introduced into the furnace chamber 2 through the inlet pipe 11 at a flow rate of 10-50 L / min for 5 minutes to completely displace the air inside the furnace and create an inert atmosphere. To improve the displacement effect, a vacuum can be drawn first or the gas circulation time can be extended.

[0094] Step 3: Set the temperature program

[0095] In the software interface of controller 13, the heating programs for the atmosphere and the sample are set respectively:

[0096] Atmosphere temperature program: Increase the temperature from room temperature to 200°C at a rate of 20°C / min and maintain a constant temperature.

[0097] Sample temperature program: After the experiment begins, start the experiment with a 30-minute delay (at which point the atmosphere has stabilized at 200℃), and then rapidly increase the temperature from the current temperature to 600℃ at a rate of >100℃ / min.

[0098] Step 4: Coordinated Heating and Data Acquisition

[0099] The system starts up. Based on the feedback from the second temperature measuring device 9, the controller 13 controls the power of the first heat source 3, so that the furnace atmosphere is heated strictly according to the set program.

[0100] Thirty minutes later, based on feedback from the first temperature measuring device 8, the controller 13 activates the second heat source 4. The infrared focusing heater begins to operate, concentrating up to 200W of power onto the bottom of the crucible 6, which is only 5mm in diameter, causing the sample to heat up rapidly.

[0101] Key technical points: During this process, controller 13 executes a coordinated control strategy. When the power of the second heat source 4 increases to rapidly heat the sample, this additional heat will slightly affect the atmosphere temperature through convection and radiation. To maintain the atmosphere temperature stable at 200°C, controller 13 will correspondingly reduce the power of the first heat source 3, achieving "dynamic power compensation" and ensuring that the two temperature zones are independently controllable.

[0102] During this stage, the sample temperature can quickly reach 600℃, while the ambient temperature remains stable at 200℃, achieving for the first time in thermogravimetric analysis a working mode where the sample temperature is significantly higher than the ambient temperature.

[0103] Step 5: Data Recording and Analysis

[0104] Throughout the experiment, the balance of the weighing system 10 records the sample's mass data in real time, while the controller 13 simultaneously records the sample temperature and the atmosphere temperature. Finally, the software generates and displays a "temperature-time-mass change" curve, which is used to analyze the thermal decomposition, oxidation, and volatilization processes of the sample under rapid heating and local high-temperature conditions.

[0105] Those skilled in the art will understand that various alternative solutions are possible without departing from the core concept of this invention:

[0106] For example, alternatives to the second heat source: The second heat source 4 is not limited to infrared focusing heating. For example, for samples with good conductivity, it can be replaced by an electromagnetic induction coil to directly heat the crucible through the eddy current effect; for dielectric materials, it can be replaced by a microwave generator to heat the sample through dielectric loss; for applications requiring extremely high energy density, it can be replaced by a laser to directly irradiate and heat through laser beam.

[0107] Alternative control logic: The control logic for dual heat sources is not limited to completely independent programs. For example, the sample temperature and the atmosphere temperature can be set to maintain a fixed difference (e.g., ΔT = 400℃), and the controller 13 can dynamically adjust the power of the second heat source 4 according to this relationship to achieve correlated control.

[0108] Through the implementation of this embodiment, the present invention brings the following significant advantages:

[0109] Breakthrough temperature gradient: It achieves "sample temperature > atmosphere temperature", perfectly simulating real industrial reaction environments such as material surface combustion and chemical vapor deposition.

[0110] Ultra-high-speed heating: By using focused infrared heating, ultra-high-speed heating of over 100℃ / min was achieved, providing a possibility for studying rapid reaction kinetics.

[0111] High precision and accuracy: Directly measures and controls the true temperature of the sample, completely eliminating the systematic error caused by thermal hysteresis in traditional TGA, resulting in extremely high data accuracy.

[0112] Wide applicability: By changing the main heat source (infrared, laser, microwave, induction), the system can be applied to samples with various physical properties, making it highly versatile.

[0113] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0114] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0115] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heating system for a multi-source thermogravimetric analyzer, characterized in that, include: The primary heat source is used to heat the atmosphere inside the furnace. The second heat source is an infrared radiation heating source, which is arranged below the furnace to irradiate the bottom of the crucible for direct heating of the sample. The second heat source includes a focusing system that focuses the infrared light to the bottom of the sample through a reflective cup. Furthermore, a gradient power allocation algorithm is used to dynamically adjust the power ratio of the second heat source to achieve gradient control of the internal temperature field of the sample; A first temperature measuring device and a second temperature measuring device. The first temperature measuring device employs a dual-modal temperature measurement coupling system. The first temperature measuring device is used to directly measure the true temperature of the sample, and the second temperature measuring device is used to measure the atmosphere temperature inside the furnace. The dual-modal temperature measurement coupling system integrates data from an ultra-fine platinum-rhodium thermocouple and an infrared thermometer. The ultra-fine platinum-rhodium thermocouple has an accuracy of ±0.1℃, and the infrared thermometer has a response time of <1ms and employs dual-wavelength colorimetric temperature measurement technology with wavelengths of 1.0μm / 1.6μm, achieving a measurement accuracy of ±0.3%. The controller executes a hybrid PID-fuzzy control algorithm, where the PID parameters are Kp=2.1, Ki=2, and Kd=0.

5. The input variables of the fuzzy control rule base are the temperature deviation ΔT and its rate of change dΔT / dt, and the output is the PID parameter adjustment amount. Based on the signals from the first and second temperature measuring devices, the controller independently controls the power output of the first and second heat sources to achieve a working mode where the sample temperature is higher than the atmosphere temperature. When ΔT > 200℃, a three-level protective cooling program is triggered. Based on the signals from the first and second temperature measuring devices, the controller performs dynamic power compensation control. When the power of the second heat source increases, the power of the first heat source is correspondingly reduced to maintain a stable atmosphere temperature. The heating rate is adjustable within the range of 50-200℃ / min.

2. The heating system according to claim 1, characterized in that, The second heat source is an infrared focusing heater, which includes a reflective cup and a quartz glass isolation cover. The reflective cup is used to focus infrared light, and the quartz glass isolation cover is used to seal and protect the heater.

3. The heating system according to claim 1, characterized in that, The controller acquires dual-modal temperature measurement signals in real time and performs power distribution calculations through the FPGA chip, with a response time of <10ms.

4. The heating system according to claim 1, characterized in that, It also includes a weighing system, which includes a balance located below the furnace. The balance is connected to the sample holder via a corundum rod. The corundum rod adopts a suspended design and is coated with a high-temperature resistant coating to achieve μg-level mass resolution.

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