Tungsten-rhenium thermocouple automatic detection system and method

Abstract

The invention provides an automatic tungsten-rhenium thermocouple detection system and method, and relates to the technical field of thermocouple detection. In the system, the reference end of a detected tungsten-rhenium thermocouple is directly connected with a change-over switch, and the temperature of the reference end of the detected tungsten-rhenium thermocouple is measured by using a digital thermometer; compared with a traditional mode that a reference end is sequentially connected with a compensation wire and a copper wire and then is inserted into a freezing point thermostat to be connected with a change-over switch, when the number of tungsten-rhenium thermocouples to be detected is large, the problem that a large number of compensation wires and freezing point thermostats are used is avoided, the system structure is simplified, and the system stability is improved. Moreover, the actual thermoelectromotive force and indicating value deviation of the detected tungsten-rhenium thermocouple at the detected temperature point are calculated by measuring the temperature of the reference end of the detected tungsten-rhenium thermocouple based on a digital thermometer, so that the problem that the environment temperature corresponding to the correction value of the traditional compensation lead is deviated from the actual environment temperature is solved. Conditional limitation on the detection environment is reduced, and meanwhile the accuracy of the calculation result is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermocouple detection, and in particular to an automatic detection system and method for tungsten-rhenium thermocouples. Background Art

[0002] Tungsten-rhenium thermocouples are sensors capable of measuring temperature in high-temperature environments and are widely used in aerospace, metallurgy, chemical engineering, and other fields. Conventional technology requires connecting one end of a compensating wire to the signal output (also known as the reference terminal) of the tungsten-rhenium thermocouple being measured. The other end of the compensating wire is connected to one end of a copper wire. The other end of the copper wire is then connected to an electrical measuring device via a switch. The connecting end of the compensating wire and the copper wire is then inserted into an ice point thermostat.

[0003] In the above detection system, each thermocouple needs to be independently connected to the freezing point thermostat, so a large number of compensation wires are required for multi-channel detection, which leads to confusing wiring, difficult maintenance, and easy failure due to mechanical vibration or poor contact. Summary of the Invention

[0004] The object of the present invention is to provide a tungsten-rhenium thermocouple automatic detection system and method, so as to alleviate the technical problems of complex system structure and poor stability in the prior art.

[0005] In a first aspect, the present invention provides a tungsten-rhenium thermocouple automatic detection system, comprising: a constant temperature device, an ice point thermostat, a transfer switch, an electrical measuring device, a data processing unit, a standard device, and a digital thermometer; wherein the standard device comprises: a standard platinum resistance thermometer, a standard thermocouple, and a standard photoelectric pyrometer; The measuring end of the standard thermocouple, the measuring end of the tungsten-rhenium thermocouple to be tested, and the temperature sensing end of the standard platinum resistance thermometer are arranged in a constant temperature device. The reference end of the standard thermocouple is connected to a transfer switch via an ice point thermostat. The reference end of the tungsten-rhenium thermocouple to be tested and the output end of the standard platinum resistance thermometer are connected to the transfer switch. The reference end of the tungsten-rhenium thermocouple to be tested is also connected to a digital thermometer. The electrical measuring equipment is connected to the transfer switch and the data processing unit respectively; the data processing unit is also connected to the transfer switch, the digital thermometer and the standard photoelectric pyrometer; When it is determined that the temperature field in the constant temperature device meets the detection requirements, the data processing unit sends an acquisition signal to the conversion switch, so that the conversion switch switches the measurement channel of the electrical measuring device according to the preset reading rules; The data processing unit acquires measurement data of the electrical measuring device, the digital thermometer and the standard photoelectric pyrometer to determine the actual thermoelectromotive force and indication deviation of each inspected tungsten-rhenium thermocouple at the inspected temperature point based on the measurement data.

[0006] In an optional embodiment, the tungsten-rhenium thermocouple automatic detection system further includes: a system management module, the system management module including: a communication configuration unit, a standard device management unit and a sampling configuration unit; A communication configuration unit, used to configure the interface parameters between the data processing unit, the electrical measuring equipment and the transfer switch; The standard instrument management unit is used to create, delete and modify the standard instrument information library; The sampling configuration unit is used to configure the number of data collection times and the data collection interval.

[0007] In an optional embodiment, the tungsten-rhenium thermocouple automatic detection system further includes: a detection task module, the detection task module including: a standard device selection unit and a detected information input unit; A standard instrument selection unit is used to provide a list of standards and determine the standard instrument model used by the automatic detection system based on the user's selection operation; The inspected information input unit is used to receive the basic information of the inspected tungsten-rhenium thermocouple sent by the user.

[0008] In an optional embodiment, if the temperature point to be detected is within the temperature range of 0°C to 300°C, the constant temperature device adopts a liquid constant temperature bath; If the temperature point to be tested is within the temperature range of 300℃~1500℃, the constant temperature equipment shall adopt a multi-stage high temperature tube furnace; If the temperature point to be tested is within the temperature range of 1500℃ to 2300℃, the constant temperature equipment uses a blackbody radiation source.

[0009] In an optional embodiment, the electrical measuring equipment includes: a high-precision digital voltmeter.

[0010] In a second aspect, the present invention provides a tungsten-rhenium thermocouple automatic detection method, which is applied to the tungsten-rhenium thermocouple automatic detection system of any of the aforementioned embodiments, comprising: When it is determined that the temperature field in the constant temperature device meets the detection requirements, the acquisition signal is sent to the conversion switch so that the conversion switch switches the measurement channel of the electrical measuring device according to the preset reading rules; Acquire measurement data from electrical measuring devices, digital thermometers, and standard photoelectric pyrometers; The temperature detection value of the digital thermometer is converted based on the reference scale to obtain the thermoelectromotive force of the reference end temperature of the tungsten-rhenium thermocouple under test; Based on the measurement data of the electrical measuring equipment on the standard platinum resistance thermometer, the measurement data of the electrical measuring equipment on the standard thermocouple, and the measurement data of the standard photoelectric pyrometer, the difference between the detected temperature point and the actual temperature within the target temperature range is calculated respectively; wherein the target temperature range includes: the temperature range of 0°C to 300°C, the temperature range of 300°C to 1500°C, and the temperature range of 1500°C to 2300°C; Based on the measurement data of the tungsten-rhenium thermocouple under test by the electrical measuring equipment, the difference between the tested temperature point and the actual temperature within the target temperature range, and the thermoelectromotive force of the reference end temperature of the tested tungsten-rhenium thermocouple, the actual thermoelectromotive force and indication deviation of each tested tungsten-rhenium thermocouple under test at the tested temperature point are calculated.

[0011] In an optional embodiment, the method further includes: Obtain historical test results of the inspected tungsten-rhenium thermocouple; The historical test results are processed using a preset performance degradation model to obtain a performance degradation prediction curve for the tungsten-rhenium thermocouple under test. The performance degradation prediction curve is a curve showing how the indication deviation of the tungsten-rhenium thermocouple changes with the operating time. Based on the performance degradation prediction curve and the preset indication deviation threshold, the remaining service life of the inspected tungsten-rhenium thermocouple is determined.

[0012] In an optional embodiment, the actual thermoelectromotive force is calculated as follows: ;in, It indicates the arithmetic mean value of the thermoelectromotive force of the tungsten-rhenium thermocouple under test measured by the electrical measuring equipment at the actual temperature of the constant temperature equipment. It represents the differential thermoelectromotive force of the tungsten-rhenium thermocouple under test at the tested temperature point. Indicates the difference between the detected temperature point and the actual temperature. Thermoelectric potential representing the reference end temperature of the tungsten-rhenium thermocouple being tested, Indicates the actual thermoelectromotive force of the tungsten-rhenium thermocouple under test at the tested temperature point; The formula for indicating deviation is: ;in, Indicates the thermoelectromotive force of the tested temperature point on the reference scale of the tested tungsten-rhenium thermocouple. Indicates the indication deviation of the tested tungsten-rhenium thermocouple at the tested temperature point.

[0013] In a third aspect, the present invention provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the automatic detection method of tungsten-rhenium thermocouple of any one of the aforementioned embodiments is implemented.

[0014] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer instructions, which, when executed by a processor, implements the automatic detection method for tungsten-rhenium thermocouples of any one of the aforementioned embodiments.

[0015] The present invention provides an automatic tungsten-rhenium thermocouple detection system. In this system, the reference end of the tungsten-rhenium thermocouple being tested is directly connected to a switch, and a digital thermometer is used to measure the temperature of the reference end of the tungsten-rhenium thermocouple being tested. Compared to the traditional method of sequentially connecting the reference end to a compensation wire and a copper wire, and then inserting an ice point thermostat to connect to the switch, this method eliminates the need for a compensation wire, thus solving the problem of difficult selection of compensation wires for tungsten-rhenium thermocouples. When a large number of tungsten-rhenium thermocouples are being tested, this system avoids the need for a large number of compensation wires and ice point thermostats, improves the cold junction compensation method, simplifies the system structure, and enhances system stability. Furthermore, by calculating the actual thermoelectromotive force and indication deviation of the tungsten-rhenium thermocouple at the tested temperature point based on the temperature measured by the digital thermometer at the reference end of the tungsten-rhenium thermocouple being tested, the problem of the ambient temperature corresponding to the compensation wire correction value deviating from the actual ambient temperature is eliminated. This reduces the restrictions on the detection environment and the number of compensation wire correction value measurements, while also improving the accuracy of the calculation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of a tungsten-rhenium thermocouple automatic detection system provided in an embodiment of the present invention; Figure 2 A schematic diagram of the arrangement of a standard thermocouple and an ice point thermostat provided in an embodiment of the present invention; Figure 3 A flowchart of a tungsten-rhenium thermocouple automatic detection method provided in an embodiment of the present invention; Figure 4 A schematic diagram of an electronic device provided by an embodiment of the present invention.

[0018] Icons: 100-constant temperature equipment; 200-freezing point thermostat; 300-changeover switch; 400-electrical measuring equipment; 500-data processing unit; 601-standard platinum resistance thermometer; 602-standard thermocouple; 603-standard photoelectric pyrometer; 60-processor; 61-memory 61; 62-bus; 63-communication interface. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0021] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0022] Example 1 Figure 1 A schematic diagram of the structure of a tungsten-rhenium thermocouple automatic detection system provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, it includes: a constant temperature device 100, an ice point thermostat 200, a transfer switch 300, an electrical measuring device 400, a data processing unit 500, a standard device and a digital thermometer ( Figure 1 Not shown); wherein the standard device includes: a standard platinum resistance thermometer 601, a standard thermocouple 602 and a standard photoelectric pyrometer 603.

[0023] The measuring end of the standard thermocouple, the measuring end of the tungsten-rhenium thermocouple to be tested and the temperature sensing end of the standard platinum resistance thermometer are arranged in a constant temperature device, the reference end of the standard thermocouple is connected to the conversion switch through an ice point thermostat, the reference end of the tungsten-rhenium thermocouple to be tested and the output end of the standard platinum resistance thermometer are connected to the conversion switch, and the reference end of the tungsten-rhenium thermocouple to be tested is also connected to a digital thermometer.

[0024] The electrical measuring equipment is connected to the transfer switch and the data processing unit respectively; the data processing unit is also connected to the transfer switch, the digital thermometer and the standard photoelectric pyrometer.

[0025] When it is determined that the temperature field in the constant temperature device meets the detection requirements, the data processing unit sends an acquisition signal to the conversion switch, so that the conversion switch switches the measurement channel of the electrical measuring device according to the preset reading rule.

[0026] The data processing unit acquires measurement data of the electrical measuring device, the digital thermometer and the standard photoelectric pyrometer to determine the actual thermoelectromotive force and indication deviation of each inspected tungsten-rhenium thermocouple at the inspected temperature point based on the measurement data.

[0027] As can be seen from the types of standard instruments provided above, the automatic detection system provided by the embodiments of the present invention can cover a temperature detection range of 0°C to 2300°C. Generally, this temperature detection range is divided into the following three temperature ranges: 0°C to 300°C, 300°C to 1500°C, and 1500°C to 2300°C. Different temperature ranges require different thermostats and standard instruments. During the system application phase, different standard instruments and thermostats need to be selected based on the temperature point (also known as the test temperature point) at which the tungsten-rhenium thermocouple being tested requires calibration. The embodiments of the present invention do not specify the model of thermostat; users can select one based on their actual needs. The only requirement is that thermostats in different temperature ranges exhibit good stability and uniformity and provide a stable temperature measurement field. Typically, thermostats are equipped with a temperature controller, such as a high-precision PID controller, which collects temperature sensor signals in real time and automatically adjusts the heating power based on the test temperature point set by the user. Furthermore, the temperature control accuracy meets the calibration specifications.

[0028] In an embodiment of the present invention, a standard platinum resistance thermometer is used to provide a resistance ratio measured at the actual temperature of a constant temperature device when the temperature point being tested is within a temperature range of 0°C to 300°C. The resistance ratio corresponding to the temperature point being tested and the rate of change of the resistance ratio with temperature, as given in the standard platinum resistance thermometer graduation table, are then used to calculate the difference between the temperature point being tested and the actual temperature, thereby correcting the thermoelectromotive force of the tungsten-rhenium thermocouple being tested, measured under the measurement environment, based on the difference.

[0029] The standard thermocouple is used to provide the thermoelectromotive force measured at the actual temperature of the constant temperature equipment when the temperature point to be tested is within the temperature range of 300℃ to 1500℃. Then, the thermoelectromotive force and differential thermoelectromotive force at the temperature point to be tested as shown in the standard thermocouple certificate are combined to calculate the difference between the temperature point to be tested and the actual temperature. The thermoelectromotive force of the tungsten-rhenium thermocouple to be tested measured under the measurement environment is corrected according to the difference.

[0030] The standard photoelectric pyrometer is used to measure the actual temperature value in the constant temperature equipment when the temperature point to be tested is within the temperature range of 1500℃ to 2300℃. Then, the temperature difference between the temperature point to be tested and the actual temperature is calculated based on the temperature error caused by the glass window on the constant temperature equipment. The thermoelectromotive force of the tungsten-rhenium thermocouple to be tested measured in the measurement environment is corrected based on this difference.

[0031] In the embodiment of the present invention, the ice point thermostat is only used to provide a constant temperature field of 0°C for the reference end of the standard thermocouple. Figure 2As shown, after the reference end of the standard thermocouple is connected to the copper wire, the connection point is directly inserted into the ice point thermostat, and the other end of the copper wire is connected to the electrical measuring equipment through the conversion switch.

[0032] Unlike the structure of traditional detection systems, the reference end of the tungsten-rhenium thermocouple under test in the embodiment of the present invention no longer requires a compensating wire or an ice-point thermostat; it can simply be connected directly to a switch via a copper wire. Compared with existing technologies, this connection method can effectively simplify the system structure and improve system stability. Furthermore, the embodiment of the present invention uses a digital thermometer to measure the temperature of the reference end of the tungsten-rhenium thermocouple under test, and then queries the corresponding thermoelectromotive force based on the graduation table of the tungsten-rhenium thermocouple under test for subsequent calculations. In other words, each tungsten-rhenium thermocouple under test requires a sensor of the digital thermometer to be in contact with its reference end for temperature measurement. The temperature data measured by the digital thermometer can be transmitted back to the data processing unit via wired or wireless communication.

[0033] Electrical measuring equipment is used to measure the thermoelectromotive force of thermocouples and the resistance of standard platinum resistors. Switches are primarily used for channel switching of multiple signals. In one example, a low-potential switch with 12 input channels and one common output can be selected. Its parasitic potential remains below 0.2 μV for extended periods, and its contact resistance is low. It can be controlled both automatically and manually, offering high reliability and a long service life. It also features an RS-232 communication interface for computer communication, allowing software to switch channels for multiple thermoelectromotive force signals via serial communication.

[0034] When using the system provided by an embodiment of the present invention to test tungsten-rhenium thermocouples, after confirming that the equipment is correctly connected and the ambient temperature and humidity meet the specifications, the thermostats are turned on and the target temperature points to be reached by each thermostat are configured. Each thermostat then operates until its constant temperature field meets the calibration specifications. At this point, the data processing unit sends an acquisition signal to the switch based on the temperature state feedback from the thermostat, controlling the switch to switch multi-channel data according to a preset reading rule, thereby collecting data from the electrical measuring device. The preset reading rule is the reading order of multiple measurement objects of the electrical measuring device. For example, if three tungsten-rhenium thermocouples are set in a thermostat, the reading order of a cycle can be: standard → test 1 → test 2 → test 3 → test 3 → test 2 → test 1 → standard. Generally, each test temperature point is read in at least two cycles, that is, the electrical measuring device measures each thermocouple at least four times, and finally calculates the arithmetic mean for calculation in subsequent steps.

[0035] The data processing unit can be connected to the digital thermometer and the standard photoelectric pyrometer through wired / wireless communication. After obtaining the measurement data of the electrical measuring equipment, the standard photoelectric pyrometer and each digital thermometer, based on the algorithm of the actual thermoelectromotive force and indication deviation of the tungsten-rhenium thermocouple at the calibration temperature point in the existing specifications, the thermoelectromotive force correction value of the compensation wire is discarded and the thermoelectromotive force corresponding to the digital thermometer is introduced to obtain the detection result, that is, the actual thermoelectromotive force and indication deviation of the tungsten-rhenium thermocouple under test at the test temperature point.

[0036] Optionally, after the data processing unit collects data from the standard device and the tungsten-rhenium thermocouple under test, the measurement data obtained from the four acquisitions of the standard device are averaged, and then the difference between the standard temperature and the actual temperature is calculated. The temperature deviation is converted into the thermoelectric potential value of the tungsten-rhenium thermocouple, and then combined with the thermoelectric potential value of the tungsten-rhenium thermocouple converted from the temperature value of the digital thermometer at the reference end of the tungsten-rhenium thermocouple under test. The measured value of the tungsten-rhenium thermocouple under test is corrected. The corrected thermoelectric potential value is the measured value of the tungsten-rhenium thermocouple under test at the tested temperature point, and the temperature indication deviation can be calculated using a formula. In this embodiment of the present invention, each measurement data will be reflected in the generated original record, and all original records will be stored in a folder for easy historical record query in the future.

[0037] An embodiment of the present invention provides an automatic detection system for tungsten-rhenium thermocouples. In this system, the reference end of the tested tungsten-rhenium thermocouple is directly connected to a switch, and a digital thermometer is used to measure the temperature of the reference end of the tested tungsten-rhenium thermocouple. Compared with the traditional method of sequentially connecting the reference end to a compensation wire and a copper wire, and then inserting an ice point thermostat to connect to the switch, this method eliminates the need for a compensation wire, thus solving the problem of difficult selection of compensation wires for tungsten-rhenium thermocouples. When a large number of tungsten-rhenium thermocouples are tested, this system avoids the need for a large number of compensation wires and ice point thermostats, improves the cold junction compensation method, simplifies the system structure, and enhances system stability. Furthermore, by calculating the actual thermoelectromotive force and indication deviation of the tested tungsten-rhenium thermocouple at the tested temperature point based on the temperature measured by the digital thermometer at the reference end of the tested tungsten-rhenium thermocouple, the problem of the ambient temperature corresponding to the compensation wire correction value deviating from the actual ambient temperature is eliminated. This reduces the restrictions on the detection environment and the number of compensation wire correction value measurements, while also improving the accuracy of the calculation results.

[0038] In an optional embodiment, if the temperature point to be tested is within the temperature range of 0°C to 300°C, the constant temperature device adopts a liquid constant temperature bath; if the temperature point to be tested is within the temperature range of 300°C to 1500°C, the constant temperature device adopts a multi-stage high-temperature tube furnace; if the temperature point to be tested is within the temperature range of 1500°C to 2300°C, the constant temperature device adopts a blackbody radiation source.

[0039] In an optional embodiment, the electrical measuring equipment includes a high-precision digital voltmeter. The electrical measuring equipment should exhibit high precision and low noise to ensure the accuracy of the measured signals. The high-precision digital voltmeter used in this embodiment of the present invention is designed specifically for laboratory and industrial temperature measurement and calibration. It offers advantages such as ease of use, simplicity of operation, and high cost-effectiveness, making it suitable for measuring and calibrating tiny thermoelectric signals, resistance signals, and temperature signals.

[0040] Optionally, to prevent oxidation of unsealed tungsten-rhenium thermocouples, a sealing device should be used to protect the tungsten-rhenium thermocouple from the atmosphere during calibration at high temperatures. The sealing device can provide a slightly positive pressure hydrogen or inert gas environment.

[0041] In an optional embodiment, the tungsten-rhenium thermocouple automatic detection system further includes: a system management module, and the system management module includes: a communication configuration unit, a standard device management unit, and a sampling configuration unit.

[0042] The communication configuration unit is used to configure the interface parameters between the data processing unit and the electrical measuring equipment and the conversion switch; specifically, the interface parameters are such as RS-232 serial port parameters. The system can scan the serial port number corresponding to each device. After the scan is completed, the corresponding serial port number needs to be set for the corresponding device.

[0043] The Standards Management Unit is used to create, delete, and modify the Standards database. Testers can add new standards to the system, and all entered standards will appear in the Standards Selection List. To use a standard, testers simply select the corresponding standard number, and the information will automatically appear in the parameter control. Testers can modify or delete standard information at any time.

[0044] The sampling configuration unit is used to configure the number of data collection times and the data collection interval.

[0045] After the system management module is set up, the system will automatically record it and use the default configuration information the next time you turn on the system.

[0046] In an optional implementation, the tungsten-rhenium thermocouple automatic detection system further includes: a detection task module, and the detection task module includes: a standard device selection unit and a detected information entry unit.

[0047] The standard instrument selection unit is used to provide a standard instrument list and determine the standard instrument model used by the automatic detection system based on the user's selection operation.

[0048] The inspected information input unit is used to receive the basic information of the inspected tungsten-rhenium thermocouple sent by the user.

[0049] Specifically, when entering the system setting directory, the user first selects the model and number of the standard used in this test in the standard list, and then all the information of the selected standard will be displayed on the standard control. Next, the user also needs to enter the basic information of the tungsten-rhenium thermocouple to be tested, including the inspection unit, manufacturer, specification model, inspection number and other information, and record the current environmental information and inspection date. After the parameter setting is completed, the system can enter the data acquisition program. Under constant temperature conditions, the values ​​of the standard and the tungsten-rhenium thermocouple to be tested are collected alternately. Optionally, each temperature point is collected four times, and the measured values ​​of the standard and the thermocouple to be tested are displayed in real time on the acquisition page.

[0050] In summary, the tungsten-rhenium thermocouple automatic detection system provided in the embodiments of the present invention can automatically detect tungsten-rhenium thermocouples over the entire temperature range, forming an automatic detection device that integrates functions such as automatic temperature control, data acquisition and calculation, and original record generation. Compared with traditional detection systems, this simplifies the system structure and improves system stability. It also eliminates the problem of the ambient temperature corresponding to the thermoelectromotive force correction value of the traditional compensation wire deviating from the actual ambient temperature. By processing all measurement data, the actual thermoelectromotive force and indication deviation of each tested tungsten-rhenium thermocouple at the tested temperature point can be accurately calculated, and the uncertainty assessment of the tungsten-rhenium thermocouple can be further performed.

[0051] Example 2 An embodiment of the present invention further provides a tungsten-rhenium thermocouple automatic detection method, which is applied to any one of the tungsten-rhenium thermocouple automatic detection systems in the above-mentioned embodiment 1. The tungsten-rhenium thermocouple automatic detection method provided in the embodiment of the present invention is specifically introduced below.

[0052] Figure 3 This is a flow chart of a method for automatically detecting tungsten-rhenium thermocouples provided by an embodiment of the present invention. Figure 3 As shown, the method mainly includes the following steps: Step S102 : When it is determined that the temperature field in the constant temperature device meets the detection requirements, a collection signal is sent to the switch, so that the switch switches the measurement channel of the electrical measuring device according to a preset reading rule.

[0053] Step S104 , obtaining measurement data of the electrical measuring device, the digital thermometer, and the standard photoelectric pyrometer.

[0054] Step S106 , converting the temperature detection value of the digital thermometer based on the reference graduation table to obtain the thermoelectromotive force of the reference end temperature of the detected tungsten-rhenium thermocouple.

[0055] The reference graduation table is a graduation table of tungsten-rhenium thermocouples, which provides the corresponding relationship between temperature and thermoelectromotive force. By querying the reference graduation table and performing calculations, the thermoelectromotive force of the reference end temperature of the tungsten-rhenium thermocouple under test can be determined.

[0056] Step S108 , based on the measurement data of the electrical measuring equipment on the standard platinum resistance thermometer, the measurement data of the electrical measuring equipment on the standard thermocouple and the measurement data of the standard photoelectric pyrometer, the difference between the detected temperature point and the actual temperature within the target temperature range is calculated respectively.

[0057] The target temperature range includes: a temperature range of 0°C to 300°C, a temperature range of 300°C to 1500°C, and a temperature range of 1500°C to 2300°C.

[0058] As can be seen from the description above, the algorithm for calculating the difference between the detected temperature point and the actual temperature is different in different temperature ranges. Specifically, in the temperature range of 0℃ to 300℃: ,in, Indicates the difference between the detected temperature point and the actual temperature within the temperature range of 0℃~300℃. It indicates the resistance ratio corresponding to the temperature point being tested given by the standard platinum resistance thermometer graduation table. It represents the arithmetic mean of the resistance ratio measured by the standard platinum resistance thermometer at the actual temperature. It indicates the rate of change of the resistance ratio corresponding to the tested temperature point given by the standard platinum resistance thermometer graduation table with temperature.

[0059] In the temperature range of 300℃~1500℃, ,in, Indicates the difference between the detected temperature point and the actual temperature within the temperature range of 300℃~1500℃. Indicates the thermoelectric electromotive force of the standard thermocouple certificate at the tested temperature point, It represents the arithmetic mean value of the thermoelectromotive force measured by the standard thermocouple at the actual temperature. It represents the differential thermoelectromotive force of the standard thermocouple certificate at the tested temperature point.

[0060] In the temperature range of 1500℃~2300℃, ,in, Indicates the difference between the detected temperature point and the actual temperature within the temperature range of 1500℃~2300℃. Indicates the temperature point being tested, Indicates the brightness temperature value measured with glass window standard. Indicates glass window error.

[0061] Step S110 , based on the measurement data of the tungsten-rhenium thermocouple under test by the electrical measuring equipment, the difference between the tested temperature point and the actual temperature within the target temperature range, and the thermoelectromotive force of the reference end temperature of the tested tungsten-rhenium thermocouple, the actual thermoelectromotive force and the indication deviation of each tested tungsten-rhenium thermocouple under test at the tested temperature point are calculated.

[0062] Specifically, the formula for the actual thermoelectromotive force is: ;in, It indicates the arithmetic mean value of the thermoelectromotive force of the tungsten-rhenium thermocouple under test measured by the electrical measuring equipment at the actual temperature of the constant temperature equipment. It represents the differential thermoelectromotive force of the tungsten-rhenium thermocouple under test at the tested temperature point. Indicates the difference between the detected temperature point and the actual temperature (according to the temperature range of the actual detected temperature point, from , , ), select the difference value that matches it. Thermoelectric potential representing the reference end temperature of the tungsten-rhenium thermocouple being tested, It indicates the actual thermoelectromotive force of the tested tungsten-rhenium thermocouple at the tested temperature point.

[0063] The formula for indicating deviation is: ;in, Indicates the thermoelectromotive force of the tested temperature point on the reference scale of the tested tungsten-rhenium thermocouple. Indicates the indication deviation of the tested tungsten-rhenium thermocouple at the tested temperature point.

[0064] In an optional implementation manner, the embodiment of the present invention further includes the following: Obtain historical test results of the tungsten-rhenium thermocouple under test; process the historical test results using a preset performance degradation model to obtain a performance degradation prediction curve of the tungsten-rhenium thermocouple under test; wherein the performance degradation prediction curve is a curve showing how the indication deviation of the tungsten-rhenium thermocouple changes with the operating time; and determine the remaining service life of the tungsten-rhenium thermocouple under test based on the performance degradation prediction curve and a preset indication deviation threshold.

[0065] Specifically, according to the design standards and actual use requirements of the tungsten-rhenium thermocouple, the user can set the life threshold of the tungsten-rhenium thermocouple performance parameters. For example, when the indication deviation of the tungsten-rhenium thermocouple exceeds the preset indication deviation threshold, it is considered that its life has ended. Therefore, the embodiment of the present invention uses a large number of historical detection results and actual service life of tungsten-rhenium thermocouples as sample data, and uses a machine learning model to learn the features implicit in the above data to obtain a preset performance degradation model. The input data of the model is the historical detection results of the tungsten-rhenium thermocouple, including: the actual thermoelectromotive force and indication deviation at each detected temperature point obtained in each detection. The output data of the model is the performance degradation prediction curve of the tungsten-rhenium thermocouple. Based on the curve, it can be seen that as the working time increases, the changing trend of the indication deviation of the tungsten-rhenium thermocouple is combined with the set preset indication deviation threshold to obtain the remaining service life of the tungsten-rhenium thermocouple, thereby assisting users to make an update plan for the tungsten-rhenium thermocouple in advance.

[0066] Example 3 See also Figure 4 An embodiment of the present invention provides an electronic device, which includes: a processor 60, a memory 61, a bus 62 and a communication interface 63, wherein the processor 60, the communication interface 63 and the memory 61 are connected via the bus 62; the processor 60 is used to execute an executable module stored in the memory 61, such as a computer program.

[0067] Memory 61 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk drive. Communication between the system network element and at least one other network element is achieved via at least one communication interface 63 (which may be wired or wireless), and may utilize the Internet, a wide area network, a local area network, a metropolitan area network, or the like.

[0068] The bus 62 may be an ISA bus, a PCI bus, or an EISA bus. The bus may be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, Figure 4 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0069] Among them, the memory 61 is used to store programs, and the processor 60 executes the program after receiving the execution instruction. The method executed by the device defined by the process disclosed in any embodiment of the above-mentioned embodiment of the present invention can be applied to the processor 60 or implemented by the processor 60.

[0070] The processor 60 may be an integrated circuit chip with signal processing capabilities. During implementation, the steps of the above method may be performed by hardware integrated logic circuits or software instructions within the processor 60. The processor 60 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present invention may be directly executed by a hardware decoding processor or by a combination of hardware and software modules within the decoding processor. The software modules may be located in storage media well-known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or the like. The storage medium is located in the memory 61 , and the processor 60 reads the information in the memory 61 and completes the steps of the above method in combination with its hardware.

[0071] A computer program product of a tungsten-rhenium thermocouple automatic detection system and method provided in an embodiment of the present invention includes a computer-readable storage medium storing a non-volatile program code executable by a processor. The instructions included in the program code can be used to execute the method described in the previous method embodiment. For specific implementation, please refer to the method embodiment and will not be repeated here.

[0072] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0073] If the functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0074] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0075] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0076] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0077] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tungsten-rhenium thermocouple automatic detection system, characterized in that: include: Constant temperature equipment, ice point thermostat, transfer switch, electrical measuring equipment, data processing unit, standard device and digital thermometer; wherein, the standard device includes: standard platinum resistance thermometer, standard thermocouple and standard photoelectric pyrometer; The measuring end of the standard thermocouple, the measuring end of the tungsten-rhenium thermocouple to be tested, and the temperature sensing end of the standard platinum resistance thermometer are arranged in the constant temperature device, the reference end of the standard thermocouple is connected to the conversion switch through the ice point thermostat, the reference end of the tungsten-rhenium thermocouple to be tested and the output end of the standard platinum resistance thermometer are connected to the conversion switch, and the reference end of the tungsten-rhenium thermocouple to be tested is also connected to the digital thermometer; The electrical measuring device is connected to the switching switch and the data processing unit respectively; the data processing unit is also connected to the switching switch, the digital thermometer and the standard photoelectric pyrometer; When it is determined that the temperature field in the constant temperature device meets the detection requirements, the data processing unit sends an acquisition signal to the conversion switch, so that the conversion switch switches the measurement channel of the electrical measuring device according to a preset reading rule; The data processing unit acquires measurement data of the electrical measuring device, the digital thermometer and the standard photoelectric pyrometer to determine the actual thermoelectromotive force and indication deviation of each tested tungsten-rhenium thermocouple at a tested temperature point based on the measurement data.

2. The automatic detection system for tungsten-rhenium thermocouples according to claim 1, characterized in that: The tungsten-rhenium thermocouple automatic detection system further includes: a system management module, which includes: a communication configuration unit, a standard device management unit and a sampling configuration unit; The communication configuration unit is used to configure the interface parameters between the data processing unit, the electrical measuring device and the transfer switch; The standard instrument management unit is used to create, delete and modify the standard instrument information library; The sampling configuration unit is used to configure the number of data collection times and the data collection interval.

3. The automatic detection system for tungsten-rhenium thermocouples according to claim 1, characterized in that: The tungsten-rhenium thermocouple automatic detection system further includes: a detection task module, which includes: a standard device selection unit and a detected information input unit; The standard device selection unit is used to provide a standard device list and determine the standard device model used by the automatic detection system based on the user's selection operation; The inspected information input unit is used to receive basic information of the inspected tungsten-rhenium thermocouple sent by the user.

4. The automatic detection system for tungsten-rhenium thermocouples according to claim 1, characterized in that: If the temperature point to be tested is within the temperature range of 0°C to 300°C, the constant temperature device adopts a liquid constant temperature bath; If the temperature point to be tested is within the temperature range of 300°C to 1500°C, the constant temperature equipment shall adopt a multi-stage high-temperature tube furnace; If the detected temperature point is within the temperature range of 1500° C. to 2300° C., the constant temperature device adopts a black body radiation source.

5. The automatic detection system for tungsten-rhenium thermocouples according to claim 1, characterized in that: The electrical measuring equipment includes: a high-precision digital voltmeter.

6. A method for automatic detection of tungsten-rhenium thermocouples, characterized in that: The automatic detection system for tungsten-rhenium thermocouples used in any one of claims 1 to 5 above comprises: When it is determined that the temperature field in the constant temperature device meets the detection requirements, a collection signal is sent to the conversion switch so that the conversion switch switches the measurement channel of the electrical measuring device according to a preset reading rule; Obtaining measurement data from the electrical measuring device, the digital thermometer, and the standard photoelectric pyrometer; Converting the temperature detection value of the digital thermometer based on a reference graduation table to obtain the thermoelectromotive force of the reference end temperature of the tungsten-rhenium thermocouple being detected; Based on the measurement data of the electrical measuring device on the standard platinum resistance thermometer, the measurement data of the electrical measuring device on the standard thermocouple, and the measurement data of the standard photoelectric pyrometer, the difference between the detected temperature point and the actual temperature within the target temperature range is calculated respectively; wherein the target temperature range includes: a temperature range of 0°C to 300°C, a temperature range of 300°C to 1500°C, and a temperature range of 1500°C to 2300°C; Based on the measurement data of the tungsten-rhenium thermocouple under test by the electrical measuring equipment, the difference between the tested temperature point and the actual temperature within the target temperature range, and the thermoelectromotive force of the reference end temperature of the tested tungsten-rhenium thermocouple, the actual thermoelectromotive force and indication deviation of each tested tungsten-rhenium thermocouple under test at the tested temperature point are calculated.

7. The automatic detection method of tungsten-rhenium thermocouple according to claim 6, characterized in that: Also includes: Obtain historical test results of the inspected tungsten-rhenium thermocouple; The historical test results are processed using a preset performance degradation model to obtain a performance degradation prediction curve of the tested tungsten-rhenium thermocouple; wherein the performance degradation prediction curve is a curve showing the variation of the indication deviation of the tungsten-rhenium thermocouple with the working time; Based on the performance degradation prediction curve and a preset indication deviation threshold, the remaining service life of the inspected tungsten-rhenium thermocouple is determined.

8. The automatic detection method of tungsten-rhenium thermocouple according to claim 6, characterized in that: The actual thermoelectromotive force is calculated as follows: ;in, It indicates the arithmetic mean value of the thermoelectromotive force of the tungsten-rhenium thermocouple under test measured by the electrical measuring equipment at the actual temperature of the constant temperature equipment. It represents the differential thermoelectromotive force of the tungsten-rhenium thermocouple under test at the tested temperature point. Indicates the difference between the detected temperature point and the actual temperature. Thermoelectric potential representing the reference end temperature of the tungsten-rhenium thermocouple being tested, Indicates the actual thermoelectromotive force of the tungsten-rhenium thermocouple under test at the tested temperature point; The formula for the indication deviation is: ;in, Indicates the thermoelectromotive force of the tested temperature point on the reference scale of the tested tungsten-rhenium thermocouple. Indicates the indication deviation of the tested tungsten-rhenium thermocouple at the tested temperature point.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, wherein: When the processor executes the computer program, the automatic detection method for tungsten-rhenium thermocouples according to any one of claims 6 to 8 is implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the automatic detection method for tungsten-rhenium thermocouples according to any one of claims 6 to 8 is implemented.

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