Surface temperature sensor radiation temperature measurement method and device based on 3000 DEG C Joule heat

Abstract

The invention provides a surface temperature sensor radiation temperature measurement method and device based on 3000 DEG C Joule heat. The test method is based on an advanced radiation high-temperature measurement principle and is combined with a precise device design to realize precise evaluation of the performance of an ultra-high-temperature surface temperature sensor; the testing device comprises a specially-made vacuum high-temperature testing chamber, a high-power laser heating system, a high-precision radiation temperature measuring system, an intelligent data acquisition and processing system and other core components, all the components work cooperatively, and a stable and reliable platform is provided for testing of the ultra-high-temperature meter temperature sensor. According to the testing method and device, the temperature response characteristics of the meter temperature sensor can be accurately measured within the ultra-high temperature range of 1500-3000 DEG C, the temperature measurement error precision can be controlled within 1%, the performance evaluation accuracy of the sensor under the extreme high temperature condition is ensured, and the testing method and device are suitable for popularization and application. And the strict requirements of aerospace, energy and other fields on ultrahigh-temperature sensor testing are effectively met.

Description

Technical Field

[0001] The invention belongs to the technical field of sensor testing, and in particular relates to a radiation temperature measurement method and device of a surface temperature sensor based on 3000°C Joule heat. Background Art

[0002] In high-end fields such as aerospace and energy, accurate temperature measurement in ultra-high temperature environments is crucial. For example, the operating temperatures of aircraft engine combustion chambers, turbine blades, aircraft thermal protection structures, new high-efficiency gas turbines, supercritical boilers and other facilities in the energy field often exceed 1500°C or even higher. However, traditional temperature sensors and their test methods have many problems when facing ultra-high temperature environments.

[0003] Conventional sensor materials become less stable at ultra-high temperatures, resulting in reduced measurement accuracy or even failure. Traditional test equipment and methods are affected by ultra-high temperature environments, such as strong thermal radiation, extreme temperature gradients, and complex chemical atmospheres, making it difficult to accurately calibrate and evaluate sensor performance. At the same time, the material structure of the test equipment itself is prone to softening, deformation, and oxidation at ultra-high temperatures, destroying the integrity and reliability of the test system, causing large deviations in the measurement data and poor repeatability.

[0004] Therefore, it is urgent to develop a method and device that can adapt to ultra-high temperature environments and accurately measure the performance of surface temperature sensors. Summary of the invention

[0005] In order to solve the problem in the prior art that the performance of surface temperature sensors cannot be accurately tested in ultra-high temperature environments, the present invention provides a radiation temperature measurement method and device for surface temperature sensors based on 3000°C Joule heat to solve the above-mentioned technical defects and achieve high-precision and high-reliability temperature measurement and sensor performance evaluation in ultra-high temperature environments.

[0006] In a first aspect, the present invention proposes a radiation temperature measurement method using a surface temperature sensor based on 3000°C Joule heat, the method comprising the following steps: System power supply and heating: 380V AC power is supplied to the rectifier module and converted into DC power. The single-chip microcomputer calculates the duty cycle of the PWM signal according to the set temperature using the PWM control algorithm, and outputs it to the MOS tube drive circuit to control the MOS tube to quickly turn on and off according to the duty cycle, so that the DC power is applied to the heating end of the instrument in the form of pulses to heat up; the ultra-high temperature surface temperature sensor measures and records the temperature of the heating end of the instrument in real time, and the infrared temperature measurement module measures the surface temperature of the heating end at the same time and transmits it to the single-chip microcomputer; after receiving the data, the single-chip microcomputer adjusts the duty cycle according to the PWM control algorithm, adjusts the heating power, and makes the temperature approach and stabilize at the set temperature; Test in the operating chamber: Turn on the water cooler and set the temperature to 20°C; use a dedicated cutting device to cut the carbon paper, the size of the carbon paper is 13cm* 5cm, fold the carbon paper into three layers and install it to the ultrafast blast furnace, and gently tighten the screws by hand to fix it; cover the infrared sensor light path hole with a glass sheet and connect the sensor lead, fix the sensor to be tested, and use asbestos to provide thermal protection for the lead in the furnace; close and lock the furnace cover, close the three-way valve on the right, open the molecular pump, turn the three-way valve on the left to the molecular pump passage, and turn off the molecular pump when the pressure gauge indicates -0.1MPa; turn on the main switch of the gas cylinder, turn the three-way valve on the left to the argon passage, and close the three-way valve on the left when the pressure gauge indicates -0.05MPa; repeat vacuuming and filling with argon three times, so that the final state in the furnace is argon and the pressure is -0.05MPa, then turn on the infrared switch and the ultrafast high temperature furnace host switch, and press the working mode; open the software to set the target temperature and start heating; save the data, turn off the software, the working mode and the ultrafast high temperature furnace host switch, and press the infrared switch to turn off; open the three-way valve on the right to vent, open the furnace cover, take out the sample, and the test is over.

[0007] Preferably, a radiation heating source is provided in the operating cavity, and the radiation heating source is made of a material that is resistant to high temperatures and can efficiently generate radiation heat, and the radiation heating source includes a ceramic heating element and a graphite heating element.

[0008] Further preferably, the graphite heating element is in the shape of a crucible, made of isostatically pressed high-purity graphite, and has an operating temperature of up to 3000°C.

[0009] Further preferably, the interior of the crucible-shaped graphite heating element is provided with a small taper, and the exterior of the graphite heating element is provided with a lifting fixture.

[0010] Preferably, an induction coil is provided in the operating cavity, and the induction coil is wound with a T2 copper tube, the copper tube has a wall thickness of 4 mm, and a high-temperature insulating paint is sprayed on the surface.

[0011] Preferably, a data processing method based on a neural network algorithm is used in the processing of data transmitted by subsequent sensors and infrared temperature measurement modules, including a neural network training method, a model structure, and a data processing flow.

[0012] Preferably, the operating chamber is provided with a high-precision temperature detection element, including an infrared temperature sensor, which is combined with an advanced control algorithm to accurately control the temperature of the radiation heating source within a very small error range.

[0013] Preferably, during the heating process, the power of the radiation heating source is adjusted according to a predetermined heating rate curve to ensure that the sensor and the test environment are in a stable state.

[0014] In a second aspect, an embodiment of the present invention provides a surface temperature sensor radiation temperature measurement device based on 3000°C Joule heat, comprising: System power supply and heating module, including power supply and temperature control module, ultra-high temperature surface temperature sensor and infrared temperature measurement module; The power supply and temperature control module includes a rectifier module, a single-chip microcomputer, a MOS tube drive circuit and a MOS tube, and is configured to supply 380V AC power to the rectifier module to convert it into DC power. The single-chip microcomputer calculates the duty cycle of the PWM signal using a PWM control algorithm according to the set temperature, outputs it to the MOS tube drive circuit, controls the MOS tube to quickly turn on and off according to the duty cycle, and applies DC power to the heating end of the instrument in the form of pulses to increase the temperature; The ultra-high temperature surface temperature sensor is configured to measure and record the temperature of the heating end of the instrument in real time; The infrared temperature measurement module is configured to simultaneously measure the surface temperature of the heating end and transmit it to the single chip microcomputer; after receiving the data, the single chip microcomputer adjusts the duty cycle according to the PWM control algorithm and adjusts the heating power so that the temperature approaches and stabilizes at the set temperature; Operational chamber test modules, including ultrafast high temperature furnaces, configured to provide a stable ultra-high temperature environment for sensor testing; The specific operation includes: turning on the water cooling machine and setting the temperature to 20°C; using a special cutting device to cut the carbon paper, the size of the carbon paper is 13cm* 5cm, fold the carbon paper into three layers and install it to the ultrafast blast furnace, and gently tighten the screws by hand to fix it; cover the infrared sensor light path hole with a glass sheet and connect the sensor lead, fix the sensor to be tested, and use asbestos to provide thermal protection for the lead in the furnace; close and lock the furnace cover, close the three-way valve on the right, open the molecular pump, turn the three-way valve on the left to the molecular pump passage, and turn off the molecular pump when the pressure gauge indicates -0.1MPa; turn on the main switch of the gas cylinder, turn the three-way valve on the left to the argon passage, and close the three-way valve on the left when the pressure gauge indicates -0.05MPa; repeat vacuuming and filling with argon three times, so that the final state in the furnace is argon and the pressure is -0.05MPa, then turn on the infrared switch and the ultrafast high temperature furnace host switch, and press the working mode; open the software to set the target temperature and start heating; save the data, turn off the software, the working mode and the ultrafast high temperature furnace host switch, and press the infrared switch to turn off; open the three-way valve on the right to vent, open the furnace cover, take out the sample, and the test is over.

[0015] Preferably, the specific structure of the ultrafast high temperature furnace includes: Furnace body and furnace cover: The furnace body adopts a vertical double-layer water-cooled structure, and together with the furnace cover, it forms a vacuum melting chamber. The furnace body is provided with a vacuum interface, a power inlet interface, and a gas charging and discharging interface; the furnace cover adopts a double-layer water-cooled butterfly head structure, the outer wall of the furnace cover is connected to the furnace cover lifting device, and the furnace cover lifting device is connected to the hydraulic system. The upper part of the furnace cover is provided with an infrared temperature measuring device, a thermocouple temperature measuring device and a heat-insulating cover plate, and the heat-insulating cover plate is made of viscose-based graphite felt and graphite plate; Induction melting and crucible insulation device: comprising a graphite crucible arranged in a graphite heating body, the graphite heating body is arranged in a corundum tube, the viscose-based graphite felt is filled between the corundum tube and the graphite heating body, an induction coil is wound around the outer wall of the corundum tube, the bottom of the corundum tube is arranged in the furnace body through a high-alumina brick bottom plate, a crucible cover is arranged on the graphite heating body and the top of the corundum tube, the crucible cover is filled with the viscose-based graphite felt, and a temperature measuring port is opened on the crucible cover; Temperature measuring device: including infrared temperature measuring device and thermocouple temperature measuring device, used to measure the temperature of the heating end of the instrument; Vacuum system: It adopts a three-stage unit, including a slide valve pump, a Roots pump, an oil booster pump and an oil mist filter connected in sequence through a vacuum pipeline. The exhaust port of the slide valve pump is equipped with an oil-water separation filter; Power supply device: including a busbar formed by connecting two copper plates and two main circuit water-cooling cables, one end of which is connected to the induction coil and the other end is connected to the medium frequency power supply; Water cooling system: connected to the furnace body, furnace cover, temperature measuring device, hydraulic system, induction melting and crucible insulation device, and medium frequency power supply respectively, including refrigeration and heat circulation system, and adopts closed water cooling structure; Gas filling and discharging system: connected to the furnace body, and capable of introducing argon or nitrogen; Stirring device: arranged on the furnace cover, including a stirring motor, the stirring motor is connected to a stainless steel water-cooled structure transmission rod penetrating the furnace cover, the end of the transmission rod is connected to a stirring rod, the lower end of the stirring rod is penetrating the induction melting and crucible insulation device, and the rotation speed of the stirring rod is not higher than 360r / min. Compared with the prior art, the beneficial results of the present invention are: The testing method and device of the present invention can accurately measure the temperature response characteristics of the surface temperature sensor in the ultra-high temperature range of 1500°C to 3000°C. The temperature measurement error accuracy can be controlled within 1%, ensuring the accuracy of the performance evaluation of the sensor under extreme high temperature conditions, and effectively meeting the stringent requirements for ultra-high temperature sensor testing in the fields of aerospace, energy, etc.

[0016] As a heating device, the ultrafast high-temperature furnace shows excellent performance in temperature control. Even at an ultra-high temperature setting of 3000℃, it can still strictly limit the temperature fluctuation range to an extremely small range, which effectively ensures the temperature stability and reliability of the entire test process. In such a stable and precise high-temperature environment, the surface temperature sensor can perform a series of precise measurement operations, and then accurately collect its various performance data under steady-state high-temperature conditions, covering measurement accuracy, response characteristics and other key indicators. These data are of decisive significance for a comprehensive and in-depth evaluation of the performance of the sensor, and can provide a critical basis for subsequent precise calibration work and targeted optimization and improvement, thereby injecting strong impetus into the continuous development of radiation temperature measurement technology of surface temperature sensors based on 3000℃ Joule heat, and also providing a solid, reliable, and indispensable technical support and guarantee foundation for the application of many related high-temperature measurement fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and are used together with the description to explain the principles of the present invention. It will be easy to recognize other embodiments and many expected advantages of the embodiments because they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with each other. The same reference numerals refer to corresponding similar parts.

[0018] Figure 1 It is a flow chart of a method for measuring temperature by radiation of a surface temperature sensor based on 3000°C Joule heat according to an embodiment of the present invention; Figure 2 A schematic diagram of a system for powering and heating a system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the architecture of a surface temperature sensor radiation temperature measurement device based on 3000°C Joule heat according to an embodiment of the present invention; Figure 4 It is a schematic diagram of intracavity testing of a specific embodiment of the present invention; Figure 5 A schematic diagram of the specific structure of a test chamber according to a specific embodiment of the present invention; Figure 6 A schematic diagram of the explosion structure of a test chamber according to a specific embodiment of the present invention; Figure 7 It is a schematic diagram of the overall architecture of a temperature measurement system according to a specific embodiment of the present invention.

[0019] Reference numerals: 1. cavity; 2. cavity structure; 3. ultra-high temperature thermocouple; 4. carbon paper; 5. upper carbon plate; 6. carbon sheet; 7. lower carbon plate; 8. infrared temperature measuring hole; 11. 380V AC; 12. Rectifier module; 13. Instrument heating end; 14. MOS tube; 15. Single chip microcomputer; 301. System power supply and temperature rise module; 302. In-operation chamber test module; 31. Power supply and temperature control module; 32. Ultra-high temperature surface temperature sensor; 33. Infrared temperature measurement module; 34. Ultra-fast high temperature furnace; 35. Data processing unit. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] The embodiments of the present invention are intended to overcome the many defects and deficiencies of existing ultra-high temperature temperature sensor testing technologies, make full use of the unique advantages of ultra-fast high temperature furnace technology, and construct an innovative ultra-high temperature surface temperature sensor radiation high temperature testing method and supporting device. Its core purpose is to achieve accurate and reliable testing and calibration of surface temperature sensors in ultra-high temperature environments, such as 1500°C and above, to ensure that the sensor can stably and accurately measure temperature under extreme high temperature conditions, thereby providing high-precision temperature measurement technology support for systems and equipment involving ultra-high temperature conditions in key fields such as aerospace, energy, etc., such as aircraft engines, gas turbines, and hypersonic aircraft thermal protection structures, to ensure the safe and stable operation of these high-end equipment, performance optimization and improvement, and promote technological innovation and development in related fields.

[0023] Specifically, through carefully designed test equipment, it is possible to accurately simulate ultra-high temperature radiation heat fields, and use scientific and reasonable test methods to conduct comprehensive performance evaluation of sensors, including the determination and optimization of key indicators such as measurement accuracy, response speed, and stability, thereby effectively solving the outstanding problems of traditional testing methods in ultra-high temperature application scenarios, such as large measurement errors, low reliability, and inability to effectively calibrate due to factors such as material performance limitations and test environment interference.

[0024] In the first aspect, the embodiment of the present invention discloses a radiation temperature measurement method of a surface temperature sensor based on 3000°C Joule heat, such as Figure 1 As shown, the method comprises the following steps: S1, system power supply and heating: 380V AC power 11 is supplied to the rectifier module 12 to convert into DC power. The single-chip microcomputer 15 calculates the duty cycle of the PWM signal according to the set temperature using the PWM control algorithm, and outputs it to the MOS tube drive circuit, and controls the MOS tube 14 to quickly turn on and off according to the duty cycle, so that the DC power is applied to the instrument heating end 13 in the form of pulses to heat up; the ultra-high temperature surface temperature sensor 32 measures and records the temperature of the instrument heating end 13 in real time, and the infrared temperature measurement module 33 measures the surface temperature of the heating end at the same time and transmits it to the single-chip microcomputer 15; after receiving the data, the single-chip microcomputer 15 adjusts the duty cycle according to the PWM control algorithm, adjusts the heating power, and makes the temperature approach and stabilize at the set temperature; Figure 2 The schematic diagram of the system power supply and temperature rise in this embodiment is shown. The specific system power supply and temperature rise process is as follows: S11, 380V AC power 11 is connected to the rectifier module 12, and the rectifier module 12 converts it into DC power to provide stable power for the entire system.

[0025] S12, the single chip microcomputer 15 pre-sets the target temperature and uses the PWM control algorithm to calculate the corresponding PWM signal duty cycle. This calculation process is based on the precise demand for temperature control to ensure that the heating power can be effectively adjusted.

[0026] S13, the calculated PWM signal duty cycle is output to the MOS tube driving circuit, and the MOS tube driving circuit drives the MOS tube 14 to work. The MOS tube 14 is quickly turned on and off according to the duty cycle, so that the direct current is applied to the instrument heating end 13 in the form of pulses. This pulse power supply method can achieve rapid temperature rise, and the heating power can be accurately controlled by adjusting the duty cycle.

[0027] S14, the ultra-high temperature surface temperature sensor 32 and the infrared temperature measurement module 33 simultaneously measure the temperature of the instrument heating end 13. The ultra-high temperature surface temperature sensor 32 records the temperature change of the heating end in real time by virtue of its high temperature resistance and high-precision measurement capability; the infrared temperature measurement module 33 provides auxiliary data from the perspective of surface temperature measurement. The data measured by both are transmitted to the single-chip microcomputer 15 in real time.

[0028] S15, after receiving the temperature data from the sensor and the infrared thermometer, the single chip computer 15 immediately processes and analyzes the data. By comparing with the preset temperature, the PWM signal duty cycle is adjusted according to the PWM control algorithm. If the current temperature is lower than the set temperature, the duty cycle is increased to increase the heating power; if it is higher than the set temperature, the duty cycle is reduced to reduce the heating power, so that the temperature gradually approaches and stabilizes at the set temperature. For example, if the current temperature is lower than the set temperature, the PWM signal duty cycle is increased to increase the heating power; otherwise, the duty cycle is reduced.

[0029] Further, according to Figure 1 and Figure 2 In the technical solution shown, the power supply process of the entire system starts with 380V AC, which first enters the rectifier module 12 and is converted into DC through the rectifier module 12, thereby providing stable power support for the entire system. In terms of temperature control, the single-chip microcomputer 15 plays a core computing and regulation function. It will use advanced PWM algorithms to accurately calculate the duty cycle of the signal based on the pre-set target temperature. After the calculation is completed, the obtained signal is output to the MOS tube drive circuit, and the MOS tube drive circuit drives the MOS tube 14 to work. The MOS tube 14 pulse modulates the input DC power, and adds the modulated pulse to the heating end of the instrument, thereby realizing the heating operation of the heating end. In the temperature monitoring link, the ultra-high temperature surface temperature sensor 32 and the infrared temperature measurement module 33 simultaneously measure the temperature of the heating end. They can quickly and accurately obtain temperature data and transmit these data to the single-chip microcomputer 15 in real time.

[0030] After receiving the data, the single chip microcomputer 15 will immediately perform a series of complex processing and in-depth analysis on it, and then dynamically adjust the signal duty cycle according to a specific algorithm, in this way to accurately control the heating power. This cycle is repeated so that the temperature of the heating end can gradually approach and stabilize at the preset target temperature, thereby ensuring that the entire system operates in a stable ultra-high temperature environment and meets various application scenarios that require an ultra-high temperature environment.

[0031] S2. Test in the operating chamber: Turn on the water cooler and set the temperature to 20°C; Use a special cutting device to cut carbon paper 4, the size of carbon paper 4 is 13cm * 5cm, fold the carbon paper into three layers and install it to the ultrafast blast furnace, and gently tighten the screws by hand to fix it; cover the infrared sensor optical path hole with a glass sheet and connect the sensor lead, fix the sensor to be tested, and use asbestos to provide thermal protection for the lead in the furnace; close and lock the furnace cover, close the three-way valve on the right, open the molecular pump, turn the three-way valve on the left to the molecular pump passage, and turn off the molecular pump when the pressure gauge indicates -0.1MPa; turn on the main switch of the gas cylinder, turn the three-way valve on the left to the argon passage, and close the three-way valve on the left when the pressure gauge indicates -0.05MPa; repeat the vacuum and argon filling three times to make the final state in the furnace argon and the pressure of -0.05MPa, then turn on the infrared switch and the ultrafast high temperature furnace 34 host switch, and press the working mode; open the software to set the target temperature and start heating; save the data, close the software, working mode and the ultrafast high temperature furnace 34 host switch, and press the infrared switch to turn off; open the three-way valve on the right to vent, open the furnace cover, take out the sample, and the test is over.

[0032] Specifically, in this embodiment, combined with Figure 7 , the intracavity test operation process is as follows: S21. Water cooler preparation: Turn on the water cooler and set the temperature to 20°C to provide a stable cooling environment for the entire test process, ensuring that all system components operate at a suitable temperature to prevent overheating and damage.

[0033] S22, installation of carbon paper 4: Use special cutting equipment to cut carbon paper 4, ensuring the size is 13cm * 5cm. As carbon paper 4 is fragile, be extra careful when operating it, fold it into three layers and install it into the ultra-fast blast furnace, and tighten the screws gently by hand to provide a stable insulation and support foundation for subsequent tests.

[0034] S23. Sensor connection and protection: Cover the infrared sensor optical path hole with a glass sheet, connect the sensor lead wire, and ensure stable signal transmission. Fix the sensor to be tested, and use asbestos to thermally protect the lead wire in the furnace to prevent high temperature from damaging the lead wire and affecting the measurement accuracy.

[0035] S24, furnace sealing and vacuuming: close and lock the furnace cover, close the three-way valve on the right, open the molecular pump, turn the three-way valve on the left to the molecular pump passage, and start the vacuuming operation. Pay close attention to the pressure gauge, and turn off the molecular pump when it indicates -0.1MPa to ensure that the furnace reaches a high vacuum state and eliminate the interference of air on the test.

[0036] S25, argon filling operation: turn on the main switch of the gas cylinder, turn the three-way valve on the left to the argon passage, and fill in argon. When the pressure gauge indicates -0.05MPa, close the three-way valve on the left, repeat vacuuming and argon filling 3 times, so that the furnace is finally filled with argon and the pressure is stable at -0.05MPa, creating an inert gas protection atmosphere to prevent problems such as material oxidation during the test.

[0037] S26. Start the heating equipment: turn on the infrared switch and the main switch of the ultra-fast high-temperature furnace 34 in sequence, press the working mode, and prepare for heating and testing.

[0038] S27, setting target temperature and heating: Open the software to set the target temperature and start the heating program. At this time, the entire system starts the heating operation according to the preset control logic, and the ultra-high temperature surface temperature sensor 32 and the infrared temperature measurement module 33 continuously monitor the temperature change.

[0039] S28, data saving and equipment shutdown: After heating is completed, save the data, turn off the software, working mode, and ultra-fast high-temperature furnace 34 host switch, press the infrared switch to turn off, ensure data security storage and orderly stop equipment operation.

[0040] S29. Take out the sample: Open the three-way valve on the right to release air, so that the pressure in the furnace returns to normal, open the furnace cover, carefully take out the sample, and complete the entire test process.

[0041] Furthermore, a radiation heating source is provided in the operating chamber. The radiation heating source is made of a material that is resistant to high temperatures and can efficiently generate radiant heat. The radiation heating source includes a ceramic heating element and a graphite heating element. In this embodiment, the graphite heating element is in the shape of a crucible and is made of isostatically pressed high-purity graphite. The operating temperature can reach 3000°C. Among them, the interior of the graphite crucible is designed with a small taper to facilitate the removal of materials, and is equipped with a lifting fixture, which is arranged on the outside of the graphite heating element; the induction coil is wound with a T2 copper tube, the copper tube wall is 4mm, and the surface is sprayed with high-temperature insulating paint.

[0042] Preferably, the heating source is made of a special material that is resistant to high temperatures and can efficiently generate radiant heat. For example, a specific ceramic heating element or a new type of high-temperature radiation material can be selected. The output power can be accurately adjusted to achieve simulation of different ultra-high temperature ranges. It has the ability to quickly heat up and stably control the temperature. Its radiation spectrum characteristics match the thermal radiation characteristics in actual ultra-high temperature application scenarios, and can accurately create the required radiant high temperature environment for the sensor.

[0043] Preferably, a working platform is provided on one side of the furnace body. The working platform is made of steel and is provided with stairs and safety guardrails.

[0044] In this embodiment, the operating chamber is provided with a high-precision temperature detection element, including an infrared temperature sensor, which is combined with an advanced control algorithm to accurately control the temperature of the radiation heating source within a very small error range. With a high-precision temperature detection element such as an infrared temperature sensor, combined with an advanced control algorithm, the temperature of the radiation heating source can be accurately controlled within a very small error range, and the adjustment of the heating power can be quickly responded to. It can be accurately adjusted according to a preset temperature curve or real-time feedback to ensure the stability and repeatability of the temperature during the test.

[0045] Furthermore, the test chamber provides a specific test environment space for the ultra-high temperature surface temperature sensor 32, and its internal structure design can ensure that the sensor is in a stable position that can simulate actual working conditions, and has good sealing properties to prevent heat loss and external interference from affecting the test results.

[0046] During the heating process, the power of the radiation heating source is adjusted according to the predetermined heating rate curve to ensure that the sensor and the test environment are in a stable state, so that the collected data can accurately reflect the performance of the sensor under stable radiation high temperature.

[0047] Furthermore, in this embodiment, the data processing process is as follows: Data collection: During the entire test process, the ultra-high temperature surface temperature sensor 32 and the infrared temperature measurement module 33 continuously collect temperature data. These data contain information on temperature changes at different stages of the heating process and are the basis for subsequent processing and analysis.

[0048] Neural network training: Before testing, the neural network is trained using a large amount of sensor data under known temperature conditions. During the training process, the neural network learns the complex relationship between temperature and sensor output signals and adjusts internal parameters to improve its ability to handle data at different temperatures.

[0049] Data processing and analysis: The real-time data collected during the test is input into the trained neural network. The neural network processes the data according to the learned model structure and algorithm, including nonlinear correction, noise filtering and other operations to improve the accuracy and reliability of the data.

[0050] Result output: The temperature data processed by the neural network is output as the final test result, providing an accurate basis for evaluating the performance of the ultra-high temperature surface temperature sensor 32.

[0051] In a second aspect, the embodiment of the present invention also discloses a surface temperature sensor radiation temperature measurement device based on 3000°C Joule heat, such as Figure 3 As shown, the device includes: a system power supply and temperature rise module 301 and an operation chamber test module 302.

[0052] Specifically, the system power supply and temperature increase module 301 includes a power supply and temperature control module 31 , an ultra-high temperature surface temperature sensor 32 and an infrared temperature measurement module 33 .

[0053] The power supply and temperature control module 31 includes a rectifier module 12, a single-chip microcomputer 15, a MOS tube drive circuit and a MOS tube 14, and is configured to supply 380V AC power 11 to the rectifier module 12 to convert it into DC power. The single-chip microcomputer 15 calculates the duty cycle of the PWM signal according to the set temperature using the PWM control algorithm, outputs it to the MOS tube drive circuit, controls the MOS tube 14 to quickly turn on and off according to the duty cycle, so that the DC power is applied to the heating end 13 of the instrument in the form of pulses to increase the temperature; The ultra-high temperature surface temperature sensor 32 is configured to measure and record the temperature of the heating end 13 of the instrument in real time; The infrared temperature measurement module 33 is configured to simultaneously measure the surface temperature of the heating end and transmit it to the single chip microcomputer 15; after receiving the data, the single chip microcomputer 15 adjusts the duty cycle according to the PWM control algorithm and adjusts the heating power to make the temperature approach and stabilize at the set temperature.

[0054] The in-chamber test module 302 includes an ultrafast high temperature furnace 34 configured to provide a stable ultrahigh temperature environment for sensor testing. The specific operations include: turning on the water cooler and setting the temperature to 20°C; using a dedicated cutting device to cut the carbon paper 4, the size of which is 13 cm * 5cm, fold the carbon paper 4 into three layers and install it to the ultrafast blast furnace, and gently tighten the screws by hand to fix it; cover the infrared sensor light path hole with a glass sheet and connect the sensor lead, fix the sensor to be tested, and use asbestos to provide thermal protection for the lead in the furnace; close and lock the furnace cover, close the three-way valve on the right, open the molecular pump, turn the three-way valve on the left to the molecular pump passage, and turn off the molecular pump when the pressure gauge indicates -0.1MPa; turn on the main switch of the gas cylinder, turn the three-way valve on the left to the argon passage, and close the three-way valve on the left when the pressure gauge indicates -0.05MPa; repeat vacuuming and filling with argon three times, so that the final state in the furnace is argon and the pressure is -0.05MPa, then turn on the infrared switch and the ultrafast high temperature furnace 34 host switch, and press the working mode; open the software to set the target temperature and start heating; save the data, turn off the software, the working mode and the ultrafast high temperature furnace 34 host switch, and press the infrared switch to turn off; open the three-way valve on the right to vent, open the furnace cover, take out the sample, and the test is over.

[0055] In this embodiment, the device further includes: a data processing unit 35: configured to process data transmitted by the sensor and the infrared temperature measurement module 33 using a data processing method based on a neural network algorithm.

[0056] Figure 4 This is a schematic diagram of the intracavity test; Figure 5 It is a schematic diagram of the specific structure of the test chamber; Figure 6 It is a schematic diagram of the explosion structure of the test chamber; Figure 7 Schematic diagram of the overall architecture of the temperature measurement system.

[0057] In a specific embodiment, Figure 4 As shown, the in-cavity test structure of the ultra-high temperature surface temperature sensor 32 is as follows: it includes a cavity 1, a cavity structure 2, and an ultra-high temperature thermocouple 3. Among them, the specific structure of the cavity 1 is as follows Figure 5 As shown. Figure 5 and Figure 6 As shown, it can be seen that the test cavity structure of the ultra-high temperature surface temperature sensor 32 includes: carbon paper 4, an upper carbon plate 5, a carbon sheet 6, a lower carbon plate 7, and an infrared temperature measuring hole 8.

[0058] In this embodiment, combined with Figure 7 The specific structure of the ultrafast high temperature furnace 34 includes: Furnace body and furnace cover: The furnace body adopts a vertical double-layer water-cooled structure, and together with the furnace cover, it forms a vacuum melting chamber. The furnace body is provided with a vacuum interface, a power inlet interface, and a gas charging and discharging interface; the furnace cover adopts a double-layer water-cooled butterfly head structure, the outer wall of the furnace cover is connected to the furnace cover lifting device, and the furnace cover lifting device is connected to the hydraulic system. The upper part of the furnace cover is provided with an infrared temperature measuring device, a thermocouple temperature measuring device and a heat-insulating cover plate, and the heat-insulating cover plate is made of viscose-based graphite felt and graphite plate; Induction melting and crucible insulation device: including a graphite crucible arranged in a graphite heating body, the graphite heating body is arranged in a corundum tube, viscose-based graphite felt is filled between the corundum tube and the graphite heating body, an induction coil is wound around the outer wall of the corundum tube, the bottom of the corundum tube is arranged in the furnace body through a high-alumina brick bottom plate, a crucible cover is arranged on the graphite heating body and the top of the corundum tube, the crucible cover is filled with viscose-based graphite felt, and a temperature measuring port is opened on the crucible cover; Temperature measuring device: including infrared temperature measuring device and thermocouple temperature measuring device, used to measure the temperature of the heating end 13 of the instrument; Vacuum system: It adopts a three-stage unit, including a slide valve pump, a Roots pump, an oil booster pump and an oil mist filter connected in sequence through a vacuum pipeline. The exhaust port of the slide valve pump is equipped with an oil-water separation filter; Power supply device: including a busbar formed by connecting two copper plates and two main circuit water-cooling cables, one end of which is connected to the induction coil and the other end is connected to the medium frequency power supply; Water cooling system: connected to the furnace body, furnace cover, temperature measuring device, hydraulic system, induction melting and crucible insulation device, medium frequency power supply, including refrigeration and heat circulation system, using closed water cooling structure; Gas filling and discharging system: connected to the furnace body, can be fed with argon or nitrogen; Stirring device: It is installed on the furnace cover and includes a stirring motor. The stirring motor is connected to a stainless steel water-cooled structure transmission rod passing through the furnace cover. The end of the transmission rod is connected to a stirring rod. The lower end of the stirring rod is passed through the induction melting and crucible insulation device. The stirring rod speed is not higher than 360r / min.

[0059] The ultrafast high temperature furnace 34 used for heating is of key significance in many aspects for a method and device for radiating high temperature testing of ultrahigh temperature surface temperature sensor 32. It can accurately and quickly create an ultrahigh temperature environment, providing an ideal test temperature field for ultrahigh temperature surface temperature sensor 32. Its rapid heating characteristics can quickly expose the sensor to the set high temperature conditions, effectively simulating the rapid temperature changes in actual application scenarios such as aerospace engine combustion chambers and high temperature reactors in the energy field, thereby accurately testing the response speed and accuracy of the sensor.

[0060] The ultrafast high temperature furnace 34 has excellent high temperature stability and can accurately control the temperature within a very small fluctuation range for a long time, which is crucial for the radiation high temperature test of the ultra-high temperature surface temperature sensor 32. The stable high temperature environment helps to obtain reliable measurement data of the sensor at a steady high temperature, so as to accurately evaluate the key performance indicators of the sensor such as accuracy and drift characteristics, and provide a solid basis for the calibration and optimization of the sensor.

[0061] Furthermore, with its advanced temperature control technology and good temperature uniformity, it can ensure the consistency of temperature at each point in the test area, avoid sensor measurement errors caused by temperature gradients, make the test results more representative and scientific, and effectively promote the development and improvement of ultra-high temperature surface temperature sensor 32 testing technology, and provide more accurate and reliable technical guarantees for high-temperature measurements in related fields.

[0062] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.

Claims

1. A radiation temperature measurement method of a surface temperature sensor based on 3000°C Joule heat, characterized in that: The method comprises the following steps: System power supply and heating: 380V AC power is supplied to the rectifier module and converted into DC power. The single-chip microcomputer calculates the duty cycle of the PWM signal according to the set temperature using the PWM control algorithm, and outputs it to the MOS tube drive circuit to control the MOS tube to quickly turn on and off according to the duty cycle, so that the DC power is applied to the heating end of the instrument in the form of pulses to heat up; the ultra-high temperature surface temperature sensor measures and records the temperature of the heating end of the instrument in real time, and the infrared temperature measurement module measures the surface temperature of the heating end at the same time and transmits it to the single-chip microcomputer; after receiving the data, the single-chip microcomputer adjusts the duty cycle according to the PWM control algorithm, adjusts the heating power, and makes the temperature approach and stabilize at the set temperature; Test in the operating chamber: Turn on the water cooler and set the temperature to 20°C; use a dedicated cutting device to cut the carbon paper, the size of the carbon paper is 13cm* 5cm, fold the carbon paper into three layers and install it to the ultrafast blast furnace, and gently tighten the screws by hand to fix it; cover the infrared sensor light path hole with a glass sheet and connect the sensor lead, fix the sensor to be tested, and use asbestos to provide thermal protection for the lead in the furnace; close and lock the furnace cover, close the three-way valve on the right, open the molecular pump, turn the three-way valve on the left to the molecular pump passage, and turn off the molecular pump when the pressure gauge indicates -0.1MPa; turn on the main switch of the gas cylinder, turn the three-way valve on the left to the argon passage, and close the three-way valve on the left when the pressure gauge indicates -0.05MPa; repeat vacuuming and filling with argon three times, so that the final state in the furnace is argon and the pressure is -0.05MPa, then turn on the infrared switch and the ultrafast high temperature furnace host switch, and press the working mode; open the software to set the target temperature and start heating; save the data, turn off the software, the working mode and the ultrafast high temperature furnace host switch, and press the infrared switch to turn off; open the three-way valve on the right to vent, open the furnace cover, take out the sample, and the test is over.

2. The method for measuring temperature by radiation of a surface temperature sensor based on 3000°C Joule heat according to claim 1, characterized in that: A radiation heating source is arranged in the operating cavity. The radiation heating source is made of a material that is resistant to high temperatures and can efficiently generate radiation heat. The radiation heating source includes a ceramic heating element and a graphite heating element.

3. The method for measuring temperature by radiation of a surface temperature sensor based on 3000°C Joule heat according to claim 2, characterized in that: The graphite heating element is in the shape of a crucible, made of isostatically pressed high-purity graphite, and has an operating temperature of up to 3000°C.

4. The method for measuring temperature by radiation of a surface temperature sensor based on 3000°C Joule heat according to claim 3, characterized in that: The crucible-shaped graphite heating element is provided with a small taper inside, and a lifting fixture is provided outside the graphite heating element.

5. The method for measuring temperature by radiation of a surface temperature sensor based on 3000°C Joule heat according to claim 1, characterized in that: An induction coil is arranged in the operating cavity. The induction coil is wound with a T2 copper tube. The copper tube has a wall thickness of 4 mm and is sprayed with high-temperature insulating paint on the surface.

6. The method for measuring temperature by radiation of a surface temperature sensor based on 3000°C Joule heat according to claim 1, characterized in that: In the processing of data transmitted by subsequent sensors and infrared temperature measurement modules, a data processing method based on a neural network algorithm is used, including a neural network training method, a model structure, and a data processing flow.

7. The method for measuring temperature by radiation of a surface temperature sensor based on 3000°C Joule heat according to claim 2, characterized in that: The operating chamber is provided with a high-precision temperature detection element, including an infrared temperature sensor, which is combined with an advanced control algorithm to accurately control the temperature of the radiation heating source within a very small error range.

8. The method for measuring temperature by radiation of a surface temperature sensor based on 3000°C Joule heat according to claim 2, characterized in that: During the heating process, the power of the radiation heating source is adjusted according to a predetermined heating rate curve to ensure that the sensor and the test environment are in a stable state.

9. A surface temperature sensor radiation temperature measurement device based on 3000°C Joule heat, characterized in that: The device includes: System power supply and heating module, including power supply and temperature control module, ultra-high temperature surface temperature sensor and infrared temperature measurement module; The power supply and temperature control module includes a rectifier module, a single-chip microcomputer, a MOS tube drive circuit and a MOS tube, and is configured to supply 380V AC power to the rectifier module to convert it into DC power. The single-chip microcomputer calculates the duty cycle of the PWM signal using a PWM control algorithm according to the set temperature, outputs it to the MOS tube drive circuit, controls the MOS tube to quickly turn on and off according to the duty cycle, and applies DC power to the heating end of the instrument in the form of pulses to increase the temperature; The ultra-high temperature surface temperature sensor is configured to measure and record the temperature of the heating end of the instrument in real time; The infrared temperature measurement module is configured to simultaneously measure the surface temperature of the heating end and transmit it to the single chip microcomputer; after receiving the data, the single chip microcomputer adjusts the duty cycle according to the PWM control algorithm and adjusts the heating power so that the temperature approaches and stabilizes at the set temperature; Operate the in-cavity test module, including an ultrafast high temperature furnace, configured to provide a stable ultra-high temperature environment for sensor testing; specific operations include: turning on the water cooler and setting the temperature to 20°C; using a dedicated cutting device to cut carbon paper, the size of which is 13cm* 5cm, fold the carbon paper into three layers and install it to the ultrafast blast furnace, and gently tighten the screws by hand to fix it; cover the infrared sensor light path hole with a glass sheet and connect the sensor lead, fix the sensor to be tested, and use asbestos to provide thermal protection for the lead in the furnace; close and lock the furnace cover, close the three-way valve on the right, open the molecular pump, turn the three-way valve on the left to the molecular pump passage, and turn off the molecular pump when the pressure gauge indicates -0.1MPa; turn on the main switch of the gas cylinder, turn the three-way valve on the left to the argon passage, and close the three-way valve on the left when the pressure gauge indicates -0.05MPa; repeat vacuuming and filling with argon three times, so that the final state in the furnace is argon and the pressure is -0.05MPa, then turn on the infrared switch and the ultrafast high temperature furnace host switch, and press the working mode; open the software to set the target temperature and start heating; save the data, turn off the software, the working mode and the ultrafast high temperature furnace host switch, and press the infrared switch to turn off; open the three-way valve on the right to vent, open the furnace cover, take out the sample, and the test is over.

10. The surface temperature sensor radiation temperature measurement device based on 3000°C Joule heat according to claim 9, characterized in that: The specific structure of the ultrafast high temperature furnace includes: Furnace body and furnace cover: The furnace body adopts a vertical double-layer water-cooled structure, and together with the furnace cover, it forms a vacuum melting chamber. The furnace body is provided with a vacuum interface, a power inlet interface, and a gas charging and discharging interface; the furnace cover adopts a double-layer water-cooled butterfly head structure, the outer wall of the furnace cover is connected to the furnace cover lifting device, and the furnace cover lifting device is connected to the hydraulic system. The upper part of the furnace cover is provided with an infrared temperature measuring device, a thermocouple temperature measuring device and a heat-insulating cover plate, and the heat-insulating cover plate is made of viscose-based graphite felt and graphite plate; Induction melting and crucible insulation device: comprising a graphite crucible arranged in a graphite heating body, the graphite heating body is arranged in a corundum tube, the viscose-based graphite felt is filled between the corundum tube and the graphite heating body, an induction coil is wound around the outer wall of the corundum tube, the bottom of the corundum tube is arranged in the furnace body through a high-alumina brick bottom plate, a crucible cover is arranged on the graphite heating body and the top of the corundum tube, the crucible cover is filled with the viscose-based graphite felt, and a temperature measuring port is opened on the crucible cover; Temperature measuring device: including infrared temperature measuring device and thermocouple temperature measuring device, used to measure the temperature of the heating end of the instrument; Vacuum system: It adopts a three-stage unit, including a slide valve pump, a Roots pump, an oil booster pump and an oil mist filter connected in sequence through a vacuum pipeline. The exhaust port of the slide valve pump is equipped with an oil-water separation filter; Power supply device: including a busbar formed by connecting two copper plates and two main circuit water-cooling cables, one end of which is connected to the induction coil and the other end is connected to the medium frequency power supply; Water cooling system: connected to the furnace body, furnace cover, temperature measuring device, hydraulic system, induction melting and crucible insulation device, and medium frequency power supply respectively, including refrigeration and heat circulation system, and adopts closed water cooling structure; Gas filling and discharging system: connected to the furnace body, and capable of introducing argon or nitrogen; Stirring device: arranged on the furnace cover, including a stirring motor, the stirring motor is connected to a stainless steel water-cooled structure transmission rod penetrating the furnace cover, the end of the transmission rod is connected to a stirring rod, the lower end of the stirring rod is penetrating the induction melting and crucible insulation device, and the rotation speed of the stirring rod is not higher than 360r / min.

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