Thermocouple sensor response time test bench

Abstract

The invention relates to the technical field of thermocouple detection, and relates to a thermocouple sensor response time test bench comprising a cold air supply device; a hot air supply device; the cold air supply device and the hot air supply device are both connected to a temperature switching device; the temperature switching device is used for selectively enabling the output end of the cold air supply device or the hot air supply device to be communicated with a verification channel, and the verification channel is provided with a thermocouple to be tested; the processor is connected with the PLC; the processor is used for calculating the response time of the thermocouple to be tested. According to the method, turbulence noise is removed, and the physical quality of step signals is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermocouple detection, and more particularly to a test bench for response time of a thermocouple sensor. BACKGROUND

[0002] Currently, the time constant test of a thermocouple is usually performed by using a traditional liquid tank insertion method or a wind tunnel method. The liquid tank insertion method is mainly realized by a constant temperature oil tank (or a water tank) and a mechanical insertion mechanism. During the test, the thermocouple is quickly inserted into the liquid medium from the air by a mechanical arm or manually. The wind tunnel method is realized by a wind tunnel test bench. The wind tunnel test bench is usually provided with only a single main air duct in terms of structural layout. A heater is directly arranged in the main air duct, or hot air is introduced into the main air duct through a simple three-way valve.

[0003] However, if the wind tunnel test bench is provided with independent air flow stabilizing pipes with short lengths for cold air and hot air respectively. After the air flow passes through the fan blades or the heating wire, the air flow directly enters the test area, and lacks the physical correction of a flow regulating structure (such as a honeycomb device), so that the air flow reaching the to-be-tested point still has a strong rotational component (vortex) and turbulence. The flow field acting on the sensor has serious turbulent oscillation and temperature stratification, and a pure and steep step temperature signal cannot be constructed, which affects the accuracy of the test result. SUMMARY

[0004] In order to solve the technical problem that the existing test bench may cause the flow field acting on the sensor to have serious turbulent oscillation and temperature stratification, thereby affecting the accuracy of the test result, the present application provides a test bench for response time of a thermocouple sensor.

[0005] A thermocouple sensor response time test bench includes: a cold air supply device that outputs cold air; a hot air supply device that outputs hot air, the hot air supply device including a heating furnace 4; both the cold air supply device and the hot air supply device are connected to a temperature switching device 7; the temperature switching device 7 is used to selectively connect the output of either the cold air supply device or the hot air supply device to a calibration channel, the calibration channel being configured with a thermocouple 10 to be tested; a processor 1 and a PLC controller 2, the processor 1 being connected to the PLC controller 2; wherein, when the processor 1 receives a user's test request, the processor 1 controls the temperature switching device 7 through the PLC controller 2, causing the output of either the cold air supply device or the hot air supply device to be tested to be connected to a calibration channel, the calibration channel being configured with a thermocouple 10 to be tested; a processor 1 and a PLC controller 2, the processor 1 being connected to the PLC controller 2; wherein, when the processor 1 receives a user's test request, the processor 1 controls the temperature switching device 7 through the PLC controller 2, causing the output of either the cold air supply device or the hot air supply device to be connected to a calibration channel, ... The hot air supply device is connected to the calibration channel, and the temperature of the heating furnace 4, the wind speed of the cold air output by the cold air supply device, and the wind speed of the hot air output by the hot air supply device are adjusted by the PLC controller 2. When the processor 1 determines that the preset conditions are met, it controls the temperature switching device 7 through the PLC controller 2 to make the cold air supply device and the hot air supply device alternately connected to the calibration channel within a preset time period, and collects the target temperature value of the thermocouple under test 10 within the preset time period. The preset conditions include: the temperature of the heating furnace 4 reaches a preset first stable temperature range and remains there for a preset duration. The processor 1 calculates the response time of the thermocouple under test 10 based on the target temperature value within the preset time period.

[0006] Preferably, the cold air supply device includes a first fan 51 and a first airflow stabilizing pipe 61. The first fan 51 is connected to one end of the first airflow stabilizing pipe 61 to generate a stable airflow in the first airflow stabilizing pipe 61, and the other end of the first airflow stabilizing pipe is the output end of the cold air supply device.

[0007] Preferably, the hot air supply device further includes a second fan 52 and a second airflow stabilizing pipe 62. The second fan 52 is connected to one end of the second airflow stabilizing pipe 62 to generate a stable airflow in the second airflow stabilizing pipe 62. The other end of the second airflow stabilizing pipe 62 is the output end of the hot air supply device. The heating furnace 4 includes a plurality of heating wires, which are used to heat the second airflow stabilizing pipe 62.

[0008] Preferably, the calibration channel is also equipped with a standard thermocouple group 8, which includes a first standard thermocouple and a second standard thermocouple respectively arranged on both sides of the thermocouple under test 10 along the airflow direction, wherein the first thermocouple and the second thermocouple are of the same type.

[0009] Preferably, the thermocouple sensor response time test bench further comprises a temperature display 9 configured to collect temperature values of the heating furnace 4, the first thermocouple and the second thermocouple, and display the temperatures of the heating furnace, the first thermocouple and the second thermocouple; before the processor 1 controls the temperature switching device 7 through the PLC controller 2, the processor 1 obtains the temperature values of the first thermocouple and the second thermocouple through the temperature display 9; and the preset condition further comprises that the temperature value of the first thermocouple is within a preset second stable temperature range and lasts for a preset time length, and the temperature value of the second thermocouple is within a preset third stable temperature range and lasts for a preset time length.

[0010] Preferably, the processor 1 calculates the response time of the to-be-tested thermocouple 10 according to the target temperature values in the preset time period comprises that the processor 1 constructs a temperature-time curve according to the target temperature values at each time in the preset time period; the processor 1 determines a plurality of response curve segments in the temperature-time curve after smoothing processing the temperature-time curve, and determines xx time of the response curve segment as a target time difference; the processor 1 determines outliers in all the target time differences through the interquartile range method, and calculates a mean value of all the target time differences that are not determined as outliers, denoted as the response time of the to-be-tested thermocouple 10.

[0011] Preferably, the processor 1 determines each response curve segment in the temperature-time curve comprises that the processor 1 performs a first-order differential operation on the smoothed temperature-time curve to obtain a temperature change rate curve; the processor 1 determines, in the temperature change rate curve, an interval with an absolute value of the temperature change rate continuously greater than a preset change rate threshold as a transient response interval; and the processor 1 cuts a curve segment corresponding to the transient response interval in the temperature-time curve as the response curve segment.

[0012] Preferably, the thermocouple sensor response time test bench further comprises that the processor 1 corrects the target temperature values at each time in the preset time period through the temperature values of the first thermocouple and the second thermocouple at each time in the preset time period before constructing the temperature-time curve, wherein the correction of the target temperature value at the i th time comprises that when the processor determines that the temperature values of the first thermocouple and the second thermocouple at the i th time are both greater than the target temperature of the to-be-tested thermocouple 10 at the i th time, the processor corrects the target temperature value at the i th time according to the following formula: .

[0013] μ is a correction amplitude coefficient of a preset size, and 0 μ <1, is the target temperature value at the i th time before correction, is the target temperature value at the i th time after correction, is the temperature value of the first thermocouple at the ith moment, is the temperature value of the second thermocouple at the ith moment, D 1 is the distance between the first thermocouple and the thermocouple to be measured 10, D 2 is the distance between the second thermocouple and the thermocouple to be measured 10, i represents an index, the first thermocouple is located upstream of the air flow of the thermocouple to be measured 10, and the second thermocouple is located downstream of the air flow of the thermocouple to be measured 10; when the processor determines that the temperature values of the first thermocouple and the second thermocouple at the ith moment are both less than the target temperature of the thermocouple to be measured 10 at the ith moment, the processor corrects the target temperature value at the ith moment according to the formula: .

[0014] Preferably, the thermocouple sensor response time test bench further comprises: the processor determines that the target temperature value of the first thermocouple at the ith moment is less than the target temperature value at the ith moment and the temperature value of the second thermocouple at the ith moment is greater than the target temperature at the ith moment after determining that the preset condition is met, and outputs an alarm signal before controlling the temperature switching device 7 through the PLC controller 2.

[0015] Preferably, the thermocouple sensor response time test bench further comprises an NI acquisition card 3, and the processor collects the target temperature value of the thermocouple to be measured 10 within a preset time period through the NI acquisition card 3.

[0016] The beneficial effects of the present application are that: The present application provides a cold air supply device (including a first air flow stabilizing pipeline) and a hot air supply device (including a second air flow stabilizing pipeline), so that the hot air can be fully mixed and vortex eliminated in the second stabilizing pipeline before cutting into the test channel, and is in a hot standby state; in cooperation with the temperature switching device, the instantaneous replacement of two pure laminar flows is realized. Based on this, the present application removes the turbulent noise and ensures the physical quality of the step signal. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, which show, by way of example, several embodiments of the present application. In the drawings: Figure 1 is a schematic diagram of a thermocouple sensor response time test bench according to an embodiment of the present application; Figure 2 is a schematic diagram of a temperature switching device according to an embodiment of the present application.

[0018] 1, processor; 2, PLC controller; 3, NI acquisition card; 4, heating furnace; 51, first fan; 52, second fan; 61, first airflow stabilizing pipeline; 62, second airflow stabilizing pipeline; 7, temperature switching device; 71, first connecting pipeline; 72, second connecting pipeline; 73, slide rail; 8, standard thermocouple group; 9, temperature display; 10, thermocouple to be measured. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0020] The specific embodiments of the present application will be described in detail below with reference to the drawings.

[0021] Figure 1 is a schematic diagram of a thermocouple sensor response time test bench according to an embodiment of the present application.

[0022] As shown in Figure 1 , a thermocouple sensor response time test bench comprises: cold air supply device, hot air supply device, temperature switching device 7, processor 1, PLC controller 2.

[0023] The output end of the cold air supply device outputs cold air; the output end of the hot air supply device outputs hot air, and the hot air supply device comprises a heating furnace 4; the cold air supply device and the hot air supply device are connected to a temperature switching device 7; the temperature switching device 7 is used to selectively connect the output end of the cold air supply device or the hot air supply device to a test channel, and the test channel is provided with a to-be-tested thermocouple 10; a processor 1 and a PLC controller 2, wherein the processor 1 is connected to the PLC controller 2; when the processor 1 receives a test request from a user, the processor 1 controls the temperature switching device 7 through the PLC controller 2 to connect the hot air supply device to the test channel, and adjusts the temperature of the heating furnace 4, the air speed of the cold air supply device and the air speed of the hot air supply device through the PLC controller 2; when the processor 1 determines that a preset condition is met, the processor 1 controls the temperature switching device 7 through the PLC controller 2 to alternately connect the cold air supply device and the hot air supply device to the test channel within a preset time period, and collects a target temperature value of the to-be-tested thermocouple 10 within the preset time period, wherein the preset condition comprises that the temperature of the heating furnace 4 reaches a preset first stable temperature range and lasts for a preset time length; and the processor 1 calculates a response time of the to-be-tested thermocouple 10 according to the target temperature value within the preset time period.

[0024] In one embodiment, the cold air supply device comprises a first fan 51 and a first airflow stabilizing pipe 61, the first fan 51 is connected to one end of the first airflow stabilizing pipe 61 to generate stable airflow in the first airflow stabilizing pipe 61, and the other end of the first airflow stabilizing pipe is the output end of the cold air supply device.

[0025] It should be noted that the first fan serves as a cold source power component for providing continuous airflow. The first airflow stabilizing pipe functions to eliminate turbulence and vortex at the outlet of the fan. By arranging the airflow in the pipe (usually provided with a rectifier grid or honeycomb structure), the output cold air has a uniform velocity field and stable flow state when reaching the test channel.

[0026] In one embodiment, the hot air supply device further comprises a second fan 52 and a second airflow stabilizing pipe 62, the second fan 52 is connected to one end of the second airflow stabilizing pipe 62 to generate stable airflow in the second airflow stabilizing pipe 62, and the other end of the second airflow stabilizing pipe 62 is the output end of the hot air supply device; the heating furnace 4 comprises a plurality of heating furnace filaments for heating the second airflow stabilizing pipe 62.

[0027] It should be noted that the hot air supply device adopts an independent second fan and a second flow stabilizing pipeline, and a heating furnace (heating furnace wire) is arranged on the pipeline path or the pipeline wall surface. After the heating furnace wire is powered on, heat is generated, the second fan blows air through the heating area, and through the mixing and flow stabilizing effect of the second air flow stabilizing pipeline, a hot air flow with uniform temperature is formed.

[0028] In one embodiment, the detection channel is also configured with a standard thermocouple group 8, which includes a first standard thermocouple and a second standard thermocouple arranged on both sides of the to-be-tested thermocouple 10 along the air flow direction, respectively, wherein the first thermocouple and the second thermocouple are of the same model.

[0029] It should be noted that the standard thermocouples are arranged upstream and downstream of the to-be-tested thermocouple (DUT) to build the ambient temperature field around the to-be-tested point. The standard thermocouples of the same model are selected to ensure that they have consistent thermoelectric characteristics and response speed and eliminate measurement system errors caused by sensor heterogeneity.

[0030] In one embodiment, the application further includes a temperature display 9 for collecting temperature values of the heating furnace 4, the first thermocouple and the second thermocouple, and the temperature display 9 is also used to display the temperatures of the heating furnace, the first thermocouple and the second thermocouple; before the temperature switching device 7 is controlled by the processor 1 through the PLC controller 2, the temperature values of the first thermocouple and the second thermocouple are also obtained through the temperature display 9; the preset condition further includes that the temperature value of the first thermocouple is within a preset second stable temperature range and lasts for a preset time length; and the temperature value of the second thermocouple is within a preset third stable temperature range and lasts for a preset time length.

[0031] It should be noted that the temperature display provides an intuitive data window for human-computer interaction. More importantly, the system sets a strict detection action trigger threshold to prevent the test from being started rashly when the thermal equilibrium has not been reached. The test is started only when the temperature field of the entire flow channel is uniform and constant, thereby excluding the interference of environmental fluctuations on the response time calculation.

[0032] In one embodiment, the processor 1 calculates the response time of the to-be-tested thermocouple 10 according to the target temperature values in the preset time period, which includes: the processor 1 constructs a temperature-time curve according to the target temperature values at each time in the preset time period; the processor 1 determines a plurality of response curve segments in the temperature-time curve after smoothing the temperature-time curve, and determines the xx time of the response curve segment as the target time difference; the processor 1 determines the outliers in all the target time differences by the interquartile range method, and calculates the mean value of all the target time differences that are not determined as outliers, which is recorded as the response time of the to-be-tested thermocouple 10.

[0033] It should be noted that during airflow testing, due to occasional electromagnetic interference or instantaneous airflow fluctuations, the calculated response time (time difference) may exhibit extremely large or small values. Therefore, this invention uses the Interquartile Range (IQR) method to calculate and remove outliers. This makes the final output response time result closer to the true physical characteristics of the sensor, greatly improving the confidence level of the test results.

[0034] In one embodiment, the processor 1 determines each response curve segment in the temperature-time curve by: the processor 1 performing a first-order differential operation on the smoothed temperature-time curve to obtain a temperature change rate curve; the processor 1 determining the interval in the temperature change rate curve where the absolute value of the temperature change rate is continuously greater than a preset change rate threshold as a transient response interval; and the processor 1 extracting the curve segment corresponding to the transient response interval in the temperature-time curve as the response curve segment.

[0035] It's important to note that the core of response time testing lies in identifying the instantaneous temperature jump. By differentiating the temperature curve, the rate of temperature change can be obtained. When switching between hot and cold air, the temperature changes drastically, causing the derivative value to increase instantaneously. The processor can pinpoint the range where the derivative value exceeds a threshold, thus accurately locating the response segment. This avoids subjective errors introduced by human operation and enables automated batch testing.

[0036] In one embodiment, the present invention further includes: before constructing the temperature-time curve, the processor 1 corrects the target temperature value at each moment within the preset time period using the temperature values ​​of the first thermocouple and the second thermocouple at each moment within the preset time period, wherein correcting the target temperature value at moment i includes: when the processor determines that the temperature values ​​of both the first thermocouple and the second thermocouple at moment i are greater than the target temperature of the thermocouple under test 10 at moment i, the processor corrects the target temperature value at moment i using the following formula: .

[0037] μ The correction magnitude coefficient is a preset value, and 0 < μ <1, The target temperature value at time i before correction. This is the corrected target temperature value at time i. Let i be the temperature value of the first thermocouple at time i. Let i be the temperature value of the second thermocouple at time i. D 1 represents the distance between the first thermocouple and the thermocouple 10 under test. D2 represents the distance between the second thermocouple and the thermocouple 10 under test, and i represents the index. The first thermocouple is located upstream of the airflow of the thermocouple 10 under test, and the second thermocouple is located downstream of the airflow of the thermocouple 10 under test. When the processor determines that the temperature values ​​of both the first and second thermocouples at time i are less than the target temperature of the thermocouple 10 under test at time i, the processor corrects the target temperature value at time i using the following formula: .

[0038] It should be noted that this invention corrects the target temperature value (the measured value) of the thermocouple 10 under test at each moment based on spatial location and thermal hysteresis compensation. When the processor determines that the temperature values ​​of the first thermocouple and the second thermocouple at moment i are both greater than the target temperature of the thermocouple 10 under test at moment i, this invention utilizes a correction term (including spatial interpolation deviation) The target value is positively compensated to make it closer to the actual fluid temperature.

[0039] When the processor determines that the temperature values ​​of both the first and second thermocouples at time i are less than the target temperature of the thermocouple under test 10 at time i, the present invention utilizes a correction term (including spatial interpolation bias) The target temperature value is negatively compensated.

[0040] In one embodiment, the present invention further includes: after determining that the preset conditions are met, and before controlling the temperature switching device 7 through the PLC controller 2, the processor determines that the target temperature value of the first thermocouple at time i is less than the target temperature value at time i, and the temperature value of the second thermocouple at time i is greater than the target temperature at time i, and outputs an alarm signal.

[0041] It should be noted that, under normal circumstances, in a unidirectional heating or cooling wind tunnel, the temperature change along the airflow direction should be monotonous (gradually decreasing or remaining constant). If a logical reversal that violates the laws of physics occurs, such as "cold upstream, hot downstream" with no heat source in between, or "extremely low temperature at the target point while extremely high temperature around it," it may be due to reversed wiring, open circuit, or severe eddy currents in the flow channel of the thermocouple 10 under test, thus requiring an alarm.

[0042] In one embodiment, the present invention further includes an NI acquisition card 3, through which the processor acquires the target temperature value of the thermocouple under test 10 within a preset time period.

[0043] Figure 2 This is a schematic diagram of a temperature switching device according to an embodiment of the present invention.

[0044] like Figure 2As shown, the temperature switching device 7 includes a first connecting pipe 71, a second connecting pipe 72, and a slide rail 73.

[0045] The temperature switching device 7 also includes a cylinder. The processor 1 controls the opening and closing of the cylinder solenoid valve through the PLC controller 2 to control the air supply and release of the air carrier, thereby controlling the movement of the slide rail. When the temperature switching device 7 connects the cold air supply device to the calibration channel through the first connecting pipe 71, the hot air output by the hot air supply device is directly discharged; when the temperature switching device 7 connects the hot air supply device to the calibration channel through the second connecting pipe 72, the cold air output by the cold air supply device is directly discharged.

[0046] In the description of this specification, "multiple" or "several" means at least two, such as two, three or more, unless otherwise explicitly specified.

[0047] While this specification has shown and described numerous embodiments of the invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of this invention.

Claims

1. A thermocouple sensor response time test bench, characterized in that, include: A cold air supply device outputs cold air from its output end; a hot air supply device outputs hot air from its output end, the hot air supply device including a heating furnace (4); both the cold air supply device and the hot air supply device are connected to a temperature switching device (7). Temperature switching device (7), which is used to selectively connect the output end of the cold air supply device or the hot air supply device to the calibration channel, the calibration channel being equipped with a thermocouple to be tested (10); processor (1) and PLC controller (2), the processor (1) being connected to the PLC controller (2). When the processor (1) receives a user's test request, the processor (1) controls the temperature switching device (7) through the PLC controller (2) so that the hot air supply device is connected to the calibration channel, and adjusts the temperature of the heating furnace (4), the wind speed of the cold air output by the cold air supply device and the wind speed of the hot air output by the hot air supply device through the PLC controller (2). When the processor (1) determines that the preset conditions are met, it controls the temperature switching device (7) through the PLC controller (2) so that the cold air supply device and the hot air supply device are alternately connected to the calibration channel within a preset time period, and collects the target temperature value of the thermocouple under test (10) within the preset time period. The preset conditions include: the temperature of the heating furnace (4) reaches the preset first stable temperature range and continues for a preset duration; the processor (1) calculates the response time of the thermocouple under test (10) based on the target temperature value within the preset time period.

2. The thermocouple sensor response time test bench according to claim 1, characterized in that, The cold air supply device includes a first fan (51) and a first airflow stabilizing pipe (61). The first fan (51) is connected to one end of the first airflow stabilizing pipe (61) to generate a stable airflow in the first airflow stabilizing pipe (61). The other end of the first airflow stabilizing pipe is the output end of the cold air supply device.

3. The thermocouple sensor response time test bench according to claim 1, characterized in that, The hot air supply device further includes a second fan (52) and a second airflow stabilizing pipe (62). The second fan (52) is connected to one end of the second airflow stabilizing pipe (62) to generate a stable airflow in the second airflow stabilizing pipe (62). The other end of the second airflow stabilizing pipe (62) is the output end of the hot air supply device. The heating furnace (4) includes a plurality of heating wires, which are used to heat the second airflow stabilizing pipe (62).

4. The thermocouple sensor response time test bench according to claim 1, characterized in that, The calibration channel is also equipped with a standard thermocouple group (8), which includes a first standard thermocouple and a second standard thermocouple arranged on both sides of the thermocouple under test (10) along the airflow direction, wherein the first thermocouple and the second thermocouple are of the same type.

5. A thermocouple sensor response time test bench according to claim 4, characterized in that, It also includes a temperature display (9), which is used to collect the temperature values ​​of the heating furnace (4), the first thermocouple and the second thermocouple, and the temperature display (9) is also used to display the temperature of the heating furnace, the first thermocouple and the second thermocouple; Before the processor (1) controls the temperature switching device (7) through the PLC controller (2), it also obtains the temperature values ​​of the first thermocouple and the second thermocouple through the temperature display (9); The preset conditions also include: the temperature value of the first thermocouple is within a preset second stable temperature range for a preset duration; and the temperature value of the second thermocouple is within a preset third stable temperature range for a preset duration.

6. A thermocouple sensor response time test bench according to claim 5, characterized in that, The processor (1) calculates the response time of the thermocouple (10) under test based on the target temperature value within a preset time period, including: The processor (1) constructs a temperature-time curve based on the target temperature values ​​at each moment within a preset time period; After smoothing the temperature-time curve, the processor (1) determines multiple response curve segments in the temperature-time curve and determines the xx time of the response curve segment as the target time difference; The processor (1) determines outliers among all the target time differences by the interquartile range method and calculates the mean of all target time differences that are not determined to be outliers, which is denoted as the response time of the thermocouple (10) under test.

7. A thermocouple sensor response time test bench according to claim 6, characterized in that, The processor (1) determines that each response segment in the temperature-time curve includes: The processor (1) performs a first-order differential operation on the smoothed temperature-time curve to obtain the temperature change rate curve; In the temperature change rate curve, the processor (1) determines the interval in which the absolute value of the temperature change rate is continuously greater than the preset change rate threshold as the transient response interval; the processor (1) extracts the corresponding curve segment in the temperature-time curve of the transient response interval as the response curve segment.

8. A thermocouple sensor response time test bench according to claim 6, characterized in that, Also includes: Before constructing the temperature-time curve, the processor (1) corrects the target temperature value at each moment within the preset time period using the temperature values ​​of the first thermocouple and the second thermocouple at each moment within the preset time period. The correction of the target temperature value at moment i includes: When the processor determines that the temperature values ​​of both the first thermocouple and the second thermocouple at time i are greater than the target temperature of the thermocouple under test (10) at time i, the processor corrects the target temperature value at time i using the following formula: ； μ The correction magnitude coefficient is a preset value, and 0 < μ <1, This is the target temperature value at time i before correction. This is the corrected target temperature value at time i. Let i be the temperature value of the first thermocouple at time i. Let i be the temperature value of the second thermocouple at time i. D 1 represents the distance between the first thermocouple and the thermocouple under test (10). D 2 represents the distance between the second thermocouple and the thermocouple under test (10), i represents the index, the first thermocouple is located upstream of the airflow of the thermocouple under test (10), and the second thermocouple is located downstream of the airflow of the thermocouple under test (10); When the processor determines that the temperature values ​​of both the first thermocouple and the second thermocouple at time i are less than the target temperature of the thermocouple under test (10) at time i, the processor corrects the target temperature value at time i using the following formula: 。 9. A thermocouple sensor response time test bench according to claim 4, characterized in that, Also includes: After determining that the preset conditions are met, before controlling the temperature switching device (7) through the PLC controller (2), the processor outputs an alarm signal when it determines that the target temperature value of the first thermocouple at time i is less than the target temperature value at time i, and the temperature value of the second thermocouple at time i is greater than the target temperature at time i.

10. A thermocouple sensor response time test bench according to claim 1, characterized in that, It also includes an NI acquisition card (3), through which the processor acquires the target temperature value of the thermocouple under test (10) within a preset time period.

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