A temperature measurement system with calibration function

Abstract

The application belongs to the technical field of aerial survey, and particularly relates to a temperature measuring system with a calibration function. The system comprises multiple thermocouples (1), each of which is connected with a current collector ring (2), the current collector ring (2) comprising a first wiring terminal (21) connected with all first hot electrodes in parallel and a second wiring terminal (22) connected with all second hot electrodes in parallel, the first wiring terminal (21) being connected with a first input end of a measuring device (4) and a first resistor R1 respectively, the second wiring terminal (22) being connected with a second resistor R2, the first resistor R1 and the second resistor R2 being connected in parallel and then connected with a second input end of the measuring device, and the resistance value of the first resistor R1 being determined based on a preset temperature calibration value and resistance value correspondence table, the temperature calibration value and resistance value correspondence table recording the resistance value of the first resistor R1 under multiple different temperature calibration requirements. The application realizes high-precision and high-reliability temperature measurement through a temperature calibrator.

Description

Technical Field

[0001] This application belongs to the field of airborne measurement technology, and specifically relates to a temperature measurement system with calibration function. Background Technology

[0002] Currently, aircraft temperature acquisition generally uses thermistor sensors or thermocouple sensors. This requires additional acquisition resources for signal processing or temperature calibration, making the system complex and lacking reliability. In particular, when acquiring temperature from flow fields in space, multiple sensors need to be designed, resulting in disadvantages such as high dispersion, numerous acquisition resources, and high costs.

[0003] As the speed of aircraft increases exponentially, the aerodynamic heat and engine combustion heat increase exponentially, reaching thousands of degrees Celsius. This places higher demands on temperature acquisition. Accurate temperature acquisition is the foundation for achieving aircraft thermal management and engine performance. As an important parameter, reliable and high-precision measurement is particularly crucial. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a temperature measurement system with calibration functionality for high-temperature measurement of temperature fields in areas such as the surface of a hypersonic aircraft fuselage, the bleed air control system, and the engine combustion chamber.

[0005] The temperature measurement system with calibration function provided in this application mainly includes multiple thermocouples. Each thermocouple is connected to a collector ring. The collector ring includes a first terminal connected in parallel to all the hot ends of the first thermoelectrodes and a second terminal connected in parallel to all the hot ends of the second thermoelectrodes. The first terminal is connected to the first input terminal of the measuring device and a first resistor R1, respectively. The second terminal is connected to a second resistor R2. The first resistor R1 and the second resistor R2 are connected in parallel and then connected to the second input terminal of the measuring device.

[0006] The resistance value of the first resistor R1 is determined based on a preset temperature calibration value and resistance value correspondence table. The temperature calibration value and resistance value correspondence table records the resistance values ​​of the first resistor R1 under multiple different temperature calibration requirements. The thermocouple temperature is corrected by a temperature calibrator formed by the first resistor R1 and the second resistor R2 connected in parallel.

[0007] Preferably, the temperature measurement system further includes a connector for connecting the measuring device to the temperature calibrator and for connecting the temperature calibrator to the slip ring.

[0008] Preferably, in the temperature calibration value and resistance value correspondence table, a corresponding second resistor R2 value is set every 5°C within the range of 0 to 100°C.

[0009] Preferably, the calibrator cover of the temperature measurement system is marked with a label indicating the temperature calibration correction value corresponding to the resistance value of the second resistor R2.

[0010] Preferably, the slip ring is made of nickel-chromium-nickel-aluminum alloy calibration wire and is laid inside the anti-surge sleeve.

[0011] Preferably, the thermocouple includes a housing, and two independently operating thermoelectrode hot ends are disposed in the cavity of the housing. The thermoelectrode hot ends are exposed to the hot gas flow through a stagnation chamber. The stagnation chamber includes an air inlet and an air outlet disposed on the housing. The two thermoelectrode hot ends are respectively connected to a first contact screw and a second contact screw through thermoelectrode connections. The first contact screw and the second contact screw are respectively connected to the first output terminal and the second output terminal of the slip ring.

[0012] This application achieves high-precision and high-reliability temperature measurement through a temperature calibrator. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the system composition of a preferred embodiment of the temperature measurement system with calibration function of this application.

[0014] Figure 2 This is a schematic diagram of a thermocouple structure.

[0015] Among them, 1-thermocouple, 11-housing, 12-first contact screw, 13-second contact screw, 14-thermoelectric electrode, 15-air inlet, 16-stagnation chamber, 17-exhaust port, 18-thermoelectric electrode hot end, 19-sleeve, 2-slip ring, 21-first output terminal, 22-second terminal, 3-temperature calibrator, 4-measuring device, 5-connector. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0017] This application provides a temperature measurement system with calibration function, such as Figure 1As shown, it mainly includes multiple thermocouples 1, each thermocouple is connected to a collector ring 2, the collector ring 2 includes a first terminal 21 that connects all the hot ends of the first thermoelectrodes in parallel and a second terminal 22 that connects all the hot ends of the second thermoelectrodes in parallel. The first terminal 21 is connected to the first input terminal of the measuring device 4 and the first resistor R1 respectively, and the second terminal 22 is connected to the second resistor R2. The first resistor R1 and the second resistor R2 are connected in parallel and then connected to the second input terminal of the measuring device.

[0018] The resistance value of the first resistor R1 is determined based on a preset temperature calibration value and resistance value correspondence table. The temperature calibration value and resistance value correspondence table records the resistance values ​​of the first resistor R1 under multiple different temperature calibration requirements. The thermocouple temperature is corrected by a temperature calibrator 3 formed by the first resistor R1 and the second resistor R2 connected in parallel.

[0019] This application employs multiple thermocouples connected in parallel to form a thermocouple collector ring, achieving automatic temperature balancing across different regions. It also eliminates redundant temperature measurements and, based on the factory specifications of the thermocouples, incorporates a temperature calibrator, enabling high-precision and high-reliability temperature measurement. For details, please refer to... Figure 1 The circuit diagram shows that the second terminal is connected to the measuring device 4 via a temperature calibrator, which consists of a first resistor R1 and a second resistor R2 connected in parallel, i.e., the temperature calibrator is in the form of a voltage divider.

[0020] In some optional embodiments, in the temperature calibration value to resistance value correspondence table, a corresponding second resistor R2 value is set every 5°C within the 0-100°C range. For example, the function of the temperature corrector is to reduce the temperature indication value by 5, 10, ... 100°C, with the aim of converting these temperature indication values ​​into a uniform value. In this embodiment, the temperature calibration value to resistance value correspondence table is shown in Table 1 below, which records the first resistor R1 value under different temperature calibration requirements. For example, if a temperature measurement system needs to be corrected by 20°C, then the first resistor R1 value is selected as 5.54 ohms.

[0021] Table 1 Temperature Calibration Table

[0022] R1, Ω 4.16±0.04 5.54±0.05 6.92±0.07 8.31±0.08 9.7±0.1 11.08±0.11 Δt4, ℃ 45 50 55 60 65 70 R1, Ω 12.36±0.12 13.86±0.14 15.14±0.15 16.62±0.17 18±0.19 19.38±0.19 Δt4, ℃ 75 80 85 90 95 100 R1, Ω 20.78±0.21 22.11±0.23 23.6±0.24 24.95±0.25 26.32±0.26 27.72±0.28

[0023] In some alternative implementations, such as Figure 1 As shown, the temperature measurement system also includes a connector 5 for connecting the measuring device 4 to the temperature calibrator 3 and connecting the temperature calibrator 3 to the slip ring 2.

[0024] In some alternative embodiments, the calibrator cap of the temperature measurement system is marked with a label indicating the temperature calibration correction value corresponding to the resistance value of the second resistor R2. For example, if a temperature measurement system needs to be calibrated by 30°, the selected first resistor R1 has a resistance value of 8.31 ohms, and the calibrator cap of the temperature measurement system is marked with a correction temperature of 30°.

[0025] In some alternative implementations, the collector ring 2 is made of nickel-chromium-nickel-aluminum alloy calibration wire and is laid inside the wave shield.

[0026] In some alternative implementations, such as Figure 2 As shown, the thermocouple 1 includes a housing 11. Two independently operating thermoelectrode hot ends 18 are disposed within the cavity of the housing 11. The thermoelectrode hot ends 18 are exposed to the hot gas flow through a stagnation chamber 16. The stagnation chamber 16 includes an inlet 15 and an outlet 17 disposed on the housing 1. The two thermoelectrode hot ends 18 are respectively connected to a first contact screw 12 and a second contact screw 13 via thermoelectrodes 14. The first contact screw 12 and the second contact screw 13 are respectively connected to the first output terminal 21 and the second output terminal 22 of the slip ring 2. In this embodiment, the thermoelectrode 4 is welded to the first contact screw 12 and the second contact screw 13 and is integrally arranged within the sleeve 19.

[0027] Compared with the prior art, this application has the following advantages:

[0028] Advanced performance enables temperature measurement of the flow field and automatic temperature equalization. A temperature calibrator is incorporated based on the thermocouple's factory parameters, achieving high-precision and high-reliability temperature measurement. High reliability is achieved through a parallel design, reducing measurement circuitry and eliminating redundant temperature measurements, thus improving reliability. Good versatility allows for the configuration of different numbers of thermocouples according to space constraints and measurement requirements, offering flexibility for high-temperature measurement of areas such as the surface of hypersonic aircraft fuselages, environmental control bleed air, and engine combustion chambers.

[0029] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A temperature measurement system with calibration function, characterized in that, It includes multiple thermocouples (1), each thermocouple is connected to a collector ring (2), the collector ring (2) includes a first terminal (21) that connects all the hot ends of the first thermoelectrodes in parallel and a second terminal (22) that connects all the hot ends of the second thermoelectrodes in parallel, the first terminal (21) is connected to the first input terminal of the measuring device (4) and the first resistor R1 respectively, the second terminal (22) is connected to the second resistor R2, and the first resistor R1 and the second resistor R2 are connected in parallel and then connected to the second input terminal of the measuring device; The resistance value of the first resistor R1 is determined based on a preset temperature calibration value and resistance value correspondence table. The temperature calibration value and resistance value correspondence table records the resistance values ​​of the first resistor R1 under multiple different temperature calibration requirements. The thermocouple temperature is corrected by a temperature calibrator (3) formed by the first resistor R1 and the second resistor R2 connected in parallel.

2. The temperature measurement system with calibration function as described in claim 1, characterized in that, The temperature measurement system also includes a connector (5) for connecting the measuring device (4) to the temperature calibrator (3) and for connecting the temperature calibrator (3) to the slip ring (2).

3. The temperature measurement system with calibration function as described in claim 1, characterized in that, In the temperature calibration value and resistance value correspondence table, a corresponding second resistor R2 value is set every 5°C within the range of 0 to 100°C.

4. The temperature measurement system with calibration function as described in claim 1, characterized in that, The calibrator cover of the temperature measurement system is marked with a label indicating the temperature calibration correction value corresponding to the resistance value of the second resistor R2.

5. The temperature measurement system with calibration function as described in claim 1, characterized in that, The collector ring (2) is made of nickel-chromium-nickel-aluminum alloy calibration wire and is laid inside the wave shield.

6. The temperature measurement system with calibration function as described in claim 1, characterized in that, The thermocouple (1) includes a housing (11). Two independently operating thermoelectrode hot ends (18) are provided in the cavity of the housing (11). The thermoelectrode hot ends (18) are exposed to the hot gas flow through a stagnation chamber (16). The stagnation chamber (16) includes an air inlet (15) and an exhaust port (17) provided on the housing (1). The two thermoelectrode hot ends (18) are respectively connected to a first contact screw (12) and a second contact screw (13) through a thermoelectrode (14). The first contact screw (12) and the second contact screw (13) are respectively connected to the first output terminal (21) and the second output terminal (22) of the collector ring (2).

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