198 results about "Maximum temperature" patented technology

The invention discloses a method for evaluating rock mass fracture freeze-thaw fracture damage risk based on surface temperature, which comprises the following steps: S1, carrying out data acquisition on a target area based on a multi-source sensor carried by an unmanned aerial vehicle platform, and obtaining fracture geometric parameters, daily surface minimum temperature, daily surface maximum temperature, daily temperature difference and fracture moisture conditions; s2, on the basis of the geometric parameters of the crack, constructing a crack frost heaving force analytical model; obtaining a quantitative relation between the stress intensity factor and the environment temperature; s3, the I-type fracture toughness of the target rock mass is measured, and the critical crack initiation temperature of the rock mass is determined; determining the number of critical freezing and thawing cycles; s4, on the basis of the daily earth surface minimum temperature, the daily temperature difference, the fracture moisture condition and the critical crack initiation temperature, the annual accumulated effective freezing and thawing cycle number is obtained; and calculating a freeze-thaw damage ratio, and carrying out risk quantification and grading. According to the invention, the problem of inaccurate evaluation caused by limitation to local monitoring and lack of an environment factor and material parameter integrated evaluation framework in the prior art is solved.

A system for monitoring a switchgear includes an infrared camera; a processing unit; and an output unit. The camera acquires a first infrared image. The processing unit determines a pixel in the first image with a maximum temperature and uses a second number of pixels to determine a temperature interval. The processing unit sorts the pixels in descending order of temperature to determine a threshold temperature and determines that a hot spot exists in the switchgear using the temperature interval for the first infrared image. The output unit is configured to output an indication of a fault in the switchgear when the determination has been made that a hot spot exists in the switchgear.

The invention discloses an electromagnetic heating system, and a method and a device for detecting the thermistor of the electromagnetic heating system. The method comprises the following steps of: recording the temperature value obtained by the thermistor as a first temperature value when the electromagnetic heating system is powered on; recording the temperature value obtained by the thermistoras a second temperature value when the electromagnetic heating system is in a standby state; obtaining the maximum temperature value and the minimum temperature value of the temperature value obtainedby the thermistor in a continuously preset second preset time every other first preset time during the heating process of the electromagnetic heating system; and judging whether the thermistor is ina failure state or not according to the first temperature value and / or the second temperature value, the maximum temperature value, and the minimum temperature value. The method for detecting the thermistor of the electromagnetic heating system judges whether the thermistor fails or not according to the static temperature values at the time of power-on and standby and the dynamic temperature valuein the heating process, so that the accuracy and the reliability of the judgment are greatly improved, and the safety of the system is improved.

Provided is a non-oriented electrical steel sheet that is excellent in iron loss and magnetic anisotropy under high magnetic flux and high frequency conditions, and a method for manufacturing the same. [Solution] A method for producing a grain-oriented electrical steel sheet includes the steps of heating a slab containing, by weight, 1.5 to 6.5% Si, 0.0005 to 3.5% Al, 0.01 to 3.0% Mn, 0.005 to 5.0% Cr, 0.0005 to 0.03% S, the balance being Fe and other unavoidable impurities, at 1050 to 1220°C, finish hot rolling the slab to obtain a hot-rolled sheet, hot-rolling the hot-rolled sheet at 850 to 1150°C for 30 to 300 seconds, cold-rolling the hot-rolled sheet that has been annealed to obtain a cold-rolled sheet, heating the cold-rolled sheet, and rolling the heated cold-rolled sheet. and final annealing at 600 to 1150°C for 10 to 300 seconds, wherein the cold rolling satisfies the following [Relationship 2], wherein the heating rate in the temperature range of 300 to 500°C during heating is 5 to 150°C / s, and the gas atmosphere in the temperature range of 500 to 750°C during the final annealing is composed of, by volume, 15 to 99.99% hydrogen, 0.0001 to 0.0030% oxygen, and the balance being an inert gas, and the oxygen content in the gas atmosphere in the temperature range of 800 to 1100°C during the final annealing is 1 to 1.5 times that in the temperature range of 500 to 750°C. [Relationship 2] Maximum temperature of cold-rolled sheet surface during cold rolling < 200 × cold rolling reduction / 100 + 40

The invention relates to the technical field of parameter cooperative control, and discloses a multi-parameter cooperative control method and an incubator, and the method comprises the steps: carrying out the disturbance measurement of the heating power and carbon dioxide injection in an incubator body, and calculating a temperature-to-concentration influence coefficient and a concentration-to-temperature influence coefficient; identifying door opening disturbance according to the door state signal jump and the maximum temperature drop rate and the concentration drop rate of the N temperature sensors, and collecting maximum temperature deviation and concentration deviation; on the basis of the maximum temperature deviation and the concentration deviation, the opening degree of an electromagnetic proportional valve is set to be in a large-flow state to rapidly recover the carbon dioxide concentration, and after concentration recovery is completed, control parameter compensation is conducted according to the temperature-to-concentration influence coefficient and the concentration-to-temperature influence coefficient. According to the method, the problem that temperature adjustment and concentration adjustment interfere with each other is solved, and cooperative control over parameters is achieved.

The invention discloses an over-temperature protection method, device and equipment for a power module of a motor controller, and belongs to the technical field of vehicle safety, and the over-temperature protection method for the power module of the motor controller comprises the steps: determining the running state of a vehicle according to the rotating speed of a motor if the three-phase temperature of the power module of the motor is detected to be abnormal; if the running state represents that the vehicle runs, a first temperature difference value between the maximum temperature and the minimum temperature in the three-phase temperature is determined; and if the first temperature difference value is within a preset temperature range, reducing the output power of the motor according to the average temperature of the three-phase temperature. According to the scheme, the problem that due to the fact that the temperature sensor detects the partial temperature of the power module inaccurately, the vehicle takes protection measures according to the inaccurate temperature, and then the vehicle cannot run normally can be solved.

The invention provides a testing device and a testing method for postprocessor temperature field calibration, and belongs to the technical field of internal combustion engine postprocessing, and the method comprises the following steps: installing the testing device, fixing a plurality of thermocouple probes on a base, and enabling the end surfaces of the thermocouple probes to extend to a specified measurement area of a diesel particle filter; triggering and starting a regeneration process of the diesel particulate filter under a target working condition, and synchronously collecting temperature data from the thermocouple probe in real time; calculating the maximum temperature gradient in the diesel particulate filter based on the temperature data; and comparing the maximum temperature gradient with a preset safety threshold, and adjusting a regeneration control strategy according to a comparison result. According to the invention, the test efficiency, the data accuracy and the economical efficiency are obviously improved.

Before a rolling pass (i), characterized by a parameter set (Λi), of a strip (100) in a roll stand (10), a minimum and maximum temperature (Tmin, Tmax) and a minimum and maximum coefficient of friction (µmin, µmax) are predefined and, from a setup model (200), limit values (Emin, Emax) for an emulsion actuator (21,..., 23') and setup values for the emulsion actuator (21,..., 23'), for a cooling actuator (41,..., 42') and for a lubricating actuator (31,..., 32') are predefined. During the rolling pass (i), the actuators are set to the setup values. An actual strip temperature (T') is identified by a temperature measuring device (51, 52), and an actual coefficient of friction (µ') is identified from measured manipulated-variable actual values (M'). These are taken as a basis to identify improved setup values either only for the cooling actuator (41,..., 42') and / or the lubricating actuator (31,..., 32'), or, if a change in the applied coolant rate or lubricant rate behaves synergistically with respect to the emulsion rate, additionally also for the emulsion actuator (21,..., 23'). The improved setup values are transferred from the setup model (200) to the parameter set (Λi).

Method for protecting a branch of an electrical circuit in a motor vehicle. Method for protecting a circuit branch located between an electric battery and equipment, comprising a step (E2) of comparing the measured temperature at a given point on the branch to a maximum temperature threshold, and then, when the measured temperature is above the threshold, a command to open the branch and / or a command to deactivate the equipment; and a step (E3) of measuring the intensity of an electric current flowing through the branch of the electrical circuit, then calculating an estimated temperature at the given point, and comparing the estimated temperature to the maximum temperature threshold, and then, when the estimated temperature is above the maximum temperature threshold, a command to open the branch and / or a command to deactivate the equipment. Figure for the abstract: 2

The present invention relates to a system (100) for making hybrid heating systems more efficient, characterized in that it comprises a combustion heat generator (20) adapted to be powered by a fuel mixture comprising or consisting of hydrogen or a mixture of hydrogen and oxygen, an electrolyser (30) adapted to produce said mixture of hydrogen and oxygen, a heat pump (10) comprising a low-temperature heat source, at least one heat exchanger (40) connected to said electrolyser (30) and to said heat pump (10), said exchanger being adapted to recover the waste heat from said electrolyser (30) and to transfer it to an evaporator of said heat pump (10), an accumulation tank (70) for storing a thermal fluid produced by said heat generator (20) and / or by said heat pump (10), temperature sensing means, and a memory and a control unit connected to said temperature sensing means and to said memory in which the value of a maximum ambient temperature Tamb, a maximum temperature of the accumulation tank Tam, a minimum operating temperature of the heat pump Tmin and a maximum operating temperature of the heat pump or of the thermal fluid Tmax is saved, said control unit being configured to acquire the values of the temperature of said accumulation tank Tacc, of said low-temperature heat source of said heat pump TE and of the temperature of the environment to be heated TA by means of said temperature sensing means, check if said temperature of the environment to be heated TA is lower than said maximum temperature of the environment Tamb and said temperature of said accumulation tank Tacc is lower than said maximum temperature of the accumulation tank Tam and, if so, generate a signal to switch on said combustion heat generator (20) and said electrolyser (30), and check if said temperature of the low-temperature heat source of the heat pump TE is higher than the minimum operating temperature of the heat pump Tmin and said temperature of said accumulation tank Tacc is lower than the maximum operating temperature of the heat pump or of the thermal fluid Tmax and, if so, generate a signal to switch on said heat pump (10). The present invention also relates to a method for controlling a system for making hybrid heating systems more efficient.

This invention discloses an isothermal extrusion method for aluminum alloys based on data feedback optimization control, belonging to the field of metal material processing technology. The method includes: Step 1, extruding an aluminum alloy rod at a preset initial temperature and a preset initial extrusion speed; Step 2, acquiring the extrusion exit temperature of the aluminum alloy rod in real time, and determining in real time whether the extrusion exit temperature is not less than a preset maximum temperature. If so, adjusting the extrusion speed in real time using a preset control equation until the current aluminum alloy rod extrusion is completed; Step 3, acquiring the function of the extrusion speed changing with time during the current aluminum alloy rod extrusion process, and correcting the function to obtain the corrected speed for extruding the next aluminum alloy rod; Step 4, if further extrusion is needed, extruding the next aluminum alloy rod at a preset initial temperature and corrected speed, and returning to Step 2 for repeated execution. This invention can significantly improve the efficiency and quality of aluminum alloy extrusion forming.

A liquid cooling structure for cooling an object to be cooled, according to an embodiment of the present invention, comprises: a microchannel unit for exchanging heat, by means of a cooling liquid, with an object to be cooled; a cover unit comprising an inlet for introducing the cooling liquid into the liquid cooling structure and an outlet for discharging the cooling liquid from the liquid cooling structure; and a manifold unit formed to allow the cooling liquid to flow between the cover unit and the microchannel, wherein the microchannel unit includes a plate layer in contact with the cooling liquid and a microchannel layer formed on the plate layer to have a first microchannel, in which the cooling liquid flows, formed therein. The liquid cooling structure according to the present invention allows a flow of the cooling liquid to be effectively distributed in the microchannel unit such that the object to be cooled can be uniformly cooled, thereby lowering the maximum temperature of the object to be cooled.

The invention provides a thermocouple verification furnace which is a vertical verification furnace and comprises a furnace core assembly, a one-way atmosphere protection device and a thermocouple positioning device. Through the design of the heat insulation layer, the highest temperature can reach 1800 DEG C, the upper limit of 1600 DEG C of a traditional high-temperature verification furnace is broken through, platinum and other high-melting-point materials can be melted, verification is carried out when the temperature exceeds 1600 DEG C, calibration is carried out through a fuse method by utilizing pure metal materials, and the calibration precision is improved; a vertical furnace is adopted to solve the problem of high-temperature deformation in the gravity direction of a furnace tube of a common horizontal thermocouple verification furnace; in the verification process, the whole process is protected by using the protective gas, so that the detected thermocouple is prevented from being oxidized under the high-temperature verification condition.

Disclosed herein is a method and system for controlling temperature variations across a battery pack of a vehicle. The method comprises receiving cooling inlet parameters associated with a cell cooling plate and cell parameters of a plurality of cells of the battery. Further, the method comprises determining the temperature at the cell cooling plate interface by applying a Physical Informed Neural Network (PINN) model. Based on the determined temperature, the method calculates a maximum temperature deviation across each cell. Thereafter, the method comprises determining at least one of an optimal coolant inlet flow rate and an optimal coolant inlet temperature for the cell cooling plate interface when the maximum temperature deviation exceeds a temperature threshold value. Finally, the method comprises controlling the temperature variations across the battery pack based on the determined optimal coolant inlet flow rate and the optimal coolant inlet temperature.

The application relates to a battery heat management method and device, electronic equipment, a storage medium and a program product. The method comprises the following steps: collecting a plurality of temperature values of a battery module; calculating the highest temperature, the lowest temperature and the maximum temperature difference of the battery module according to the plurality of temperature values, and identifying the current operation mode of the direct-cooling battery management system; if the current operation mode is the battery direct-cooling mode, determining the rotating speed of a compressor according to the highest temperature, determining a plurality of evaporation flow channel superheat control coefficients according to the maximum temperature difference, controlling the compressor according to the rotating speed of the compressor, and simultaneously controlling the superheat of the corresponding evaporation flow channel according to the plurality of evaporation flow channel superheat control coefficients, so as to cool the battery module. In this way, the heat management function of the battery module is accurately controlled by monitoring and controlling the heat of the battery module, the quality, volume and flow resistance of the battery heat management system are reduced, and the adaptability of the battery module is improved.

A method and system for estimating a temperature of a clutch and a maximum temperature of a clutch are described. In one example, the maximum temperature of the clutch is based on phases of a transmission gear shift. The transmission gear shift may include a power-on downshift and a power-on upshift.

A method for producing a porous ceramic structure, comprising the following: a) Making kneaded clay by kneading a raw material; b) Obtaining a pressed body by shaping the kneaded clay and c) Firing of the pressed body, wherein the raw material contains the following: Cordierite; Cer and iron and / or manganese and / or cobalt, wherein the process c) forms a porous ceramic structure comprising a porous structural body formed essentially of cordierite, cerium-containing particles firmly attached to the structural body, and metal oxide particles each firmly attached to an inside of a pore in the structural body, wherein the metal oxide particles are particles of an oxide having a spinel structure containing iron and / or manganese and / or cobalt, The process c) includes the following: c1) Raising the temperature of the pressed body to a first temperature that is less than or equal to a liquid phase formation temperature; c2) Increasing the temperature of the pressed body from the first temperature to a second temperature that is higher than the liquid phase formation temperature and lower than a crystallization temperature of the metal oxide particles; c3) Increasing the temperature of the pressed body from the second temperature to a third temperature which is greater than the crystallization temperature and less than or equal to a maximum temperature; and c4) Maintaining the temperature of the press body at the maximum temperature for a specified period of time, and wherein a rate of temperature increase in process c2) in the range of 100 °C / h to 200 °C / h.

The invention discloses a power management system adapted to an extremely low temperature environment. Through a multi-level self-adaptive heating mechanism and a hardware-algorithm cooperative control strategy, stable operation in an extremely low temperature environment is realized. The power manager integrates a closed-loop temperature control system and double-order starting logic of'hardware priority-software takeover ', the special charger adopts a distributed temperature sensing and space temperature field reconstruction technology, reliable charging and discharging management under the extreme environment of-68 DEG C is achieved through cooperation of the closed-loop temperature control system and the space temperature field reconstruction technology, heating extra power consumption is reduced by 90% or above, and the maximum temperature difference of a battery bin is smaller than or equal to 2 DEG C; and the cold start success rate is 100%. The power supply system can be widely applied to extremely-low-temperature individual power supply systems, extremely-low-temperature battery packs and other scenes, and the core technical bottleneck of the power supply system in an extreme environment is solved.

The invention discloses a temperature control method, a wire controller and a computer readable storage medium. The temperature control method is applied to the wire controller, the wire controller comprises a screen module and a controller, and the temperature control method comprises the steps that the maximum temperature rise of the controller within first preset time is acquired; in response to the fact that the maximum temperature rise is larger than a first temperature preset threshold value, an operation function corresponding to the maximum temperature rise is recorded into a function set, the controller is controlled to close background applications in sequence according to the unused time from long to short, and the brightness of the screen module is reduced to the minimum; and in response to the fact that the maximum temperature rise is smaller than a second temperature preset threshold value, the controller is controlled to sequentially recover the background applications according to the reverse order of closing the background applications, the brightness of the screen module is recovered, and the second temperature preset threshold value is smaller than the first temperature preset threshold value. According to the temperature control method, the influence of high temperature on the performance of the controller can be reduced, so that the service life of the wire controller is prolonged.

A method and control arrangement for controlling operation of a fan in a cooling system of a vehicle, wherein operation of the fan is controlled based on a temperature of a coolant in the coolant system meeting a set-temperature of the coolant. The method comprises monitoring an engine oil temperature of an engine of the vehicle during a plurality of driving cycles with the vehicle; and adjusting the set-temperature of the coolant based on a measure indicative of a plurality of maximum temperatures of the engine oil during the plurality of driving cycles.

FIELD: mining.SUBSTANCE: invention relates to methods for thermal monitoring of coal waste dumps. Temperature measurements are taken inside the dump (2) using temperature sensors (3) located in its near-surface zone (1). Temperature readings from the temperature sensors (3) are transmitted to the monitoring center (4), where the source of self-heating is identified by the recorded excess of the standardized maximum temperature of the dump in at least one of the locations of the temperature sensor. To clarify the contours of the self-heating source, measurements of the thermal field are taken along the profiles above the dump using unmanned aerial vehicles (6) with thermal imaging control equipment installed on them. The profiles for the flight of unmanned aerial vehicles are oriented along the lines connecting each point of placement of the temperature sensor, in which an excess of the standard maximum temperature of the dump is recorded, with the points of placement of the temperature sensors adjacent to it.EFFECT: increased accuracy and efficiency, as well as reduced labour intensity of establishing contours of self-heating centres of coal waste.1 cl, 1 dwg

The present application belongs to the field of high voltage and insulation technology, and specifically provides a high-voltage GIS / GIL insulation part internal micro-defect identification method, system and equipment based on temperature Spearman correlation coefficient, comprising: monitoring the ultra-high frequency partial discharge signal and shell temperature data of the high-voltage GIS / GIL equipment; after monitoring that the high-voltage GIS / GIL equipment appears an ultra-high frequency signal, monitoring the number of ultra-high frequency signals per day, determining the maximum and minimum values of the number of ultra-high frequency signals in the monitoring time, and determining the ultra-high frequency signal level per day; at the same time, determining the maximum and minimum values of the maximum temperature of the high-voltage GIS / GIL equipment shell to determine the temperature level of the high-voltage GIS / GIL equipment per day, calculating the Spearman correlation coefficient of the number of discharges per day of the ultra-high frequency signal and the temperature of the equipment shell, and used for judging the cause of the partial discharge. The present application can effectively distinguish the internal micro-defects of the insulation part and the surface metal particle defects.

This invention relates to a brake disc optimization method, device, and medium based on four-factor constraints. The method includes: obtaining the mass of a target brake disc; establishing a model with an undercarriage structure based on the parameters of the target brake disc, and obtaining the maximum limiting temperature of each part; performing optimization design without exceeding the original mass to obtain the optimized brake disc; performing CFD steady-state simulation to calculate the steady-state cooling pump air ratio; when the maximum temperature is lower than the maximum limiting temperature, determining whether it meets the preset optimization target based on the steady-state cooling pump air ratio; performing CFD transient simulation analysis on candidate brake discs to calculate the transient cooling pump air ratio; when the maximum temperature is lower than the maximum limiting temperature, determining whether it meets the optimization target based on the transient cooling pump air ratio; if so, the target brake disc is the preferred brake disc. Compared with the prior art, this invention solves or partially solves the problem that existing brake disc optimization methods lack constraints during the optimization process, leading to unsatisfactory optimization.

This invention provides a cooking device, a control method and apparatus for the cooking device, and a readable storage medium. The cooking device includes a cooking chamber, a steam generating component, and a water control component. The steam generating component includes a heating component and a steam generating chamber. The water control component includes a temperature switch, the temperature of which changes with the temperature of the heating component. The control method for the cooking device includes: acquiring the temperature inside the cooking chamber; when the temperature inside the cooking chamber is greater than or equal to a set temperature, adjusting the heating power of the heating component from a first power to a second power, wherein the first power is greater than the second power. When the heating component operates at the second power, the maximum temperature of the temperature switch is greater than or equal to a first set value, and / or the maximum temperature of the heating component is greater than or equal to the first set value. At the second power, the temperature of the temperature switch and / or the heating component can reach the inlet water temperature, reducing the amount of steam generated per unit time and decreasing water and electricity consumption.

The application relates to a method and device for determining the state of a battery temperature sensor, a medium, a vehicle and a server, the method comprising: receiving a reading statistics of a temperature sensor every predetermined time under a stable working condition of a vehicle, the reading statistics comprising a highest temperature reading and a lowest temperature reading of the temperature sensor in each predetermined time; determining a highest temperature reading trend, a lowest temperature reading trend and a maximum temperature reading difference under the stable working condition of the vehicle according to the highest temperature reading and the lowest temperature reading; and determining the state of the temperature sensor according to the highest temperature reading trend, the lowest temperature reading trend and the maximum temperature reading difference. The method can accurately determine whether the battery temperature sensor is abnormal.

A method for detecting a malfunction of a pollutant emission control system (11) of an engine (1) equipped with a particulate filter (PF), comprising the steps of: determining a first maximum temperature at the filter inlet as a function of an instantaneous operating point of the engine; determining a second maximum temperature at the inlet of the filter from the first maximum temperature based on the measurement of the engine exhaust flow; determining a third maximum temperature at the filter inlet, the third maximum temperature corresponding to a minimum value between the second maximum temperature and a value of a temperature setpoint from a control device (14) of the system (11); calculating the deviation between the third maximum temperature and the temperature measurement value at the inlet of the filter; and detecting a fault of the control system when the calculated deviation exceeds a predetermined threshold deviation.

The invention relates to the technical field of power equipment detection, in particular to a fuse quality acceptance inspection method and device, and the method comprises the steps: 1, temperature field distribution detection: introducing a rated current into a to-be-detected fuse, and obtaining the temperature field distribution of a fuse wire of the to-be-detected fuse; 2, judging whether the temperature field distribution detection is qualified or not: judging whether the temperature field distribution detection of the fuse is qualified or not according to the calculated maximum temperature difference and maximum temperature rise value of the fuse; 3, fusing threshold current detection: introducing fusing threshold current into the fuse with qualified temperature field distribution detection, continuously electrifying for 1 hour, and continuously monitoring voltage waveforms at two ends of the fuse to judge whether the fuse is fused or not; 4, whether the fuse is qualified or not is judged, and if the fuse is fused within one hour, the fuse is a qualified product; according to the invention, temperature and fusing dual detection is carried out on the fuse, the outgoing quality of the fuse is improved, and the detection device is simple in structure and convenient to use.

This invention discloses a nested serpentine channel liquid cooling plate and its battery thermal management system, belonging to the field of energy storage battery thermal management technology. The liquid cooling plate has a double-inlet, double-outlet serpentine flow channel inside, forming two parallel coolant flow paths to shorten the heat transfer path and improve temperature uniformity. A battery thermal management system includes a battery module composed of multiple square batteries and at least one liquid cooling plate, which is nested between the battery cells. Preferably, for a module composed of 20 square batteries, only three liquid cooling plates are used, respectively arranged on both sides and in the middle of the module, achieving a compact configuration of "one cooling plate cooling two battery cells". More preferably, the liquid cooling plate adopts an inlet / outlet direction of left-up-right-down and right-up-left-down, with a coolant mass flow rate of 1 g / s and an inlet temperature of 25°C. Experimental results show that at an ambient temperature of 45℃ and a discharge rate of 2C, the battery module's highest temperature is 28.75℃, the maximum temperature difference is 2.17℃, the voltage drop is 229.31Pa, and the comprehensive performance evaluation index PEC reaches 4.02. This invention significantly reduces system complexity, manufacturing costs, and flow resistance while ensuring efficient heat dissipation and excellent temperature uniformity, making it suitable for large-scale lithium iron phosphate energy storage modules.

This invention provides a method for analyzing the highest temperature experienced by 304 stainless steel and its components. When 304 stainless steel and its components operate in an air atmosphere and high-temperature environment, their surface undergoes high-temperature oxidation, producing an extremely thin and dense colorless and transparent oxide film that exhibits interference colors. The color of these interference colors is related to the thickness of the oxide film. After a certain period of high-temperature oxidation, the thickness of the oxide film produced by the 304 stainless steel and its components is related to the highest temperature experienced. The L* and a* values ​​of the surface color of the 304 stainless steel and its components are measured using a spectrophotometer. These values ​​are then substituted into the formula provided in this invention to calculate the highest temperature experienced by the 304 stainless steel and its components. The advantages of this method are: no prior test preparation is required; no observation is needed while the 304 stainless steel and its components are in operation; and it is non-contact, thus not damaging the surface of the test object.