A segmented conductive insulating rod for measuring step time

Abstract

The invention discloses a segmented conductive insulating rod for measuring step time, comprising a constant temperature and constant speed water tank, wherein the segmented conductive insulating rod is arranged in the constant temperature and constant speed water tank, wherein the segmented conductive insulating rod is fixedly connected to a slider, wherein the slider is slidably connected in a guide rail, wherein the segmented conductive insulating rod is provided with a first conductive sleeve, a first conductive cap, a first insulating rod, a first wire and a second wire, wherein the first wire and the second wire are electrically connected to a first channel and a second channel of a data acquisition instrument respectively; the first channel and the second channel are also electrically connected to an output end of a constant voltage power supply through a third wire and a fourth wire, and the other output end of the constant voltage power supply is electrically connected to medium water in the constant temperature and constant speed water tank; the invention calculates the step time by using the time difference of a voltage signal step, and provides a simple, widely applicable and interference-free measuring device for judging whether a dynamic response calibration result of a temperature sensor is valid.

Description

Technical Field

[0001] The invention relates to the technical field of step time measurement, and more particularly to a segmented conductive insulating rod for measuring step time. Background Art

[0002] When measuring fluids with fast temperature changes, contact temperature sensors generally cannot respond to the measured temperature immediately and need a certain amount of time to reach thermal equilibrium. Only when the temperature sensor and the measured fluid reach thermal equilibrium, the temperature value responded by the sensor is the temperature of the measured fluid. The dynamic response characteristic of the sensor refers to the relationship between the temperature of the temperature sensor and the temperature increment of the measured medium. In actual calibration, thermal response time is often used to describe the response of the temperature sensor to a step temperature. Thermal response time refers to the time required for the output temperature of the temperature sensor to change to a specified percentage of the fluid temperature step amount when the fluid temperature changes step by step.

[0003] The dynamic response calibration process of the temperature sensor, i.e. the process of measuring the thermal response time of the sensor, mainly includes: generating a stable calibration environment (stable velocity field and temperature field); subjecting the temperature sensor to temperature step excitation; collecting the response signal of the sensor to the step by the recording instrument, and calculating the thermal response time. The calibration environment mainly refers to a water flow or air flow environment with a stable flow field and temperature field.

[0004] my country's metrology technical specification "JJF1049 Temperature Sensor Dynamic Response Calibration" stipulates that the time required to generate a temperature step should be less than 10% of the time constant of the sensor being calibrated, and the calibration result is valid. However, there are few existing technologies that involve the measurement of temperature step time. For example, the paper "Thermocouple Time Constant Test System Based on Step Temperature Response" published by Teng Shilei and Kong Ximei in the journal "China Testing" in 2011 did not measure the time to generate a temperature step. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a segmented conductive insulating rod for measuring step time, which has the characteristic of measuring the time required for a dynamic response calibration device to generate a temperature step in order to determine whether the dynamic response calibration result is valid.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A segmented conductive insulating rod for measuring step time comprises a constant temperature and constant speed water tank, wherein a segmented conductive insulating rod is arranged in the constant temperature and constant speed water tank, wherein the segmented conductive insulating rod is fixedly connected to a slider, wherein the slider is slidably connected in a guide rail, wherein the segmented conductive insulating rod is provided with a first conductive cap, wherein a first insulating rod is clamped in the first conductive cap, wherein a first conductive sleeve is arranged on an outer surface of the first insulating rod, wherein a positioning nut is arranged on an outer surface of the first conductive sleeve, wherein the first conductive cap is electrically connected to a first wire, wherein the first conductive sleeve is electrically connected to a second wire, wherein the first wire and the second wire are respectively connected to a first channel and a second channel of a data acquisition instrument, wherein a third wire and a fourth wire are respectively arranged in the first channel and the second channel, wherein the third wire and the fourth wire are electrically connected to an output end of a constant voltage power supply, wherein the other output end of the constant voltage power supply is electrically connected to medium water in the constant temperature and constant speed water tank through a fifth wire.

[0008] Furthermore, the segmented conductive insulating rod is provided with a second conductive cap, the second conductive cap is connected to the second insulating rod through a thread, the outer surface of the second insulating rod is provided with a second conductive sleeve, and the outer surface of the second conductive sleeve is fixed with a second wire.

[0009] Furthermore, the first conductive cap and the second conductive cap are both designed to be streamlined.

[0010] In summary, the present invention has the following beneficial effects:

[0011] In the present solution, when the segmented conductive insulating rod is thrown downward into the constant temperature and constant speed water tank, the conductive cap first contacts the water surface, and when it is thrown to the end position, the conductive sleeve contacts the water surface, and the first channel and the second channel of the data acquisition instrument respectively collect voltage steps, and the time difference between the two voltage signal steps is the step time; the streamlined design of the conductive cap avoids the interference of splashes on the measurement results caused by the segmented conductive insulating rod being thrown into the water; the conductive sleeve can be moved to any position on the insulating rod and then fixed, and can be consistent with the actual insertion depth of the measured temperature sensor; during the test, the water surface of the constant temperature and constant speed water tank is kept as still as possible to avoid the interference of water surface fluctuations on the measurement results; the present invention provides a simple, sensitive, widely applicable and interference-free step time measurement device for judging whether the dynamic response calibration result of the temperature sensor is valid. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the state of the segmented conductive insulating rod of the present invention being used to measure the starting moment of the step time;

[0013] Figure 2 It is a schematic diagram of the state of the segmented conductive insulating rod of the present invention being used to measure the end moment of the step time;

[0014] Figure 3This is a schematic structural diagram of a segmented conductive insulating rod in Example 1 of the present invention from a front view;

[0015] Figure 4 This is a schematic structural diagram of a segmented conductive insulating rod in Example 2 of the present invention from a front view;

[0016] Figure 5 This is a diagram of a voltage step signal measured in Example 1 of the present invention.

[0017] In the figure:

[0018] 1 constant temperature and constant speed water tank, 2 segmented conductive insulating rod, 3 guide rail, 4 slider, 5 data acquisition instrument, 6 first channel, 7 second channel, 8 third wire, 9 fourth wire, 10 constant voltage power supply, 11 fifth wire, 12 first wire, 13 first conductive cap, 14 first insulating rod, 15 first conductive sleeve, 16 positioning nut, 17 second wire, 18 second conductive cap, 19 second conductive sleeve, 20 second insulating rod. DETAILED DESCRIPTION

[0019] Example 1

[0020] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, a segmented conductive insulating rod for measuring step time includes a constant temperature and constant speed water tank 1, a segmented conductive insulating rod 2 is arranged in the constant temperature and constant speed water tank 1, the segmented conductive insulating rod 2 is fixedly connected to a slider 4, the slider 4 is slidably connected in a guide rail 3, a first wire 12 and a second wire 17 are respectively connected to a first channel 6 and a second channel 7 of a data acquisition instrument 5, the first channel 6 and the second channel 7 are respectively provided with a third wire 8 and a fourth wire 9, the input end of the data acquisition instrument 5 is electrically connected to the output end of a constant voltage power supply 10 through the third wire 8 and the fourth wire 9, The other output end of the constant voltage power supply 10 is electrically connected to the medium water in the constant temperature and constant speed water tank 1 through the fifth wire 11. The segmented conductive insulating rod 2 is provided with a first conductive cap 13, and the first conductive cap 13 is sleeved with a first insulating rod 14. The outer surface of the first insulating rod 14 is provided with a first conductive sleeve 15. The outer surface of the first insulating rod 14 is smooth, and the outer surface of the first conductive sleeve 15 is provided with a positioning nut 16. The first conductive sleeve 15 can be moved to any position on the first insulating rod 14 and then fixed by the positioning nut 16, which can be consistent with the actual insertion depth of the temperature sensor being measured.

[0021] In this embodiment, preferably, the first conductive cap 13 is designed to be streamlined, so as to avoid the interference of splashes on the measurement results caused by the segmented conductive insulating rod 2 being thrown into the water.

[0022] When in use, the segmented conductive insulating rod 2 is thrown downward into the constant temperature and constant speed water tank 1, and the first conductive cap 13 first contacts the water surface. When the segmented conductive insulating rod 2 is thrown into the end position, the lower edge of the first conductive sleeve 15 contacts the water surface. Figure 2 In the test, the first channel 6 and the second channel 7 of the data acquisition instrument 5 respectively collect voltage steps through the connected first wire 12 and the second wire 17. The time difference between the two voltage signal steps is the step time, which realizes the simple and sensitive measurement of the step time. During the test, the water surface of the constant temperature and constant speed water tank 1 remains still, avoiding the interference of water surface fluctuations on the measurement results and improving the repeatability of the measurement results.

[0023] In this embodiment, the first conductive cap 13 and the first conductive sleeve 15 are both made of brass material, the first insulating rod 14 is made of white nylon rod material, the outer diameter of the first insulating rod 14 is 6 mm, the minimum distance between the lower edge of the first conductive sleeve 15 and the lower vertex of the first conductive cap 13 is 1 cm, and the maximum distance is 35 cm. The overall length of the segmented conductive insulating rod 2 is 40 cm, which can realize the measurement of step time of different throwing depths of 1 cm-35 cm.

[0024] In this embodiment, the running speed of the slider 4 is set to 2m / s, the positioning nut 16 is used to fix the lower edge of the first conductive sleeve 15 to be 10cm away from the lower vertex of the first conductive cap 13, the constant voltage power supply 10 is set to output a 5V DC voltage, the sampling frequency of the data acquisition instrument 5 is 1000Hz, and the measured voltage signal is as follows: Figure 5 As shown, the voltage signal collected by the first channel 6 steps to 5V at 100ms, and the voltage signal collected by the second channel 7 steps to 5V at 156ms, from which it can be calculated that the step time is 56ms.

[0025] This embodiment provides a simple, sensitive, widely applicable, and non-interference step time measurement device for determining whether the dynamic response calibration result of the temperature sensor is valid.

[0026] Example 2

[0027] like Figure 4 As shown, a segmented conductive insulating rod for measuring step time is different from Example 1 in that a second conductive cap 18 is provided on the outer surface of the segmented conductive insulating rod 2, a second insulating rod 20 is threadedly connected to the second conductive cap 18, a second conductive sleeve 19 is provided on the outer surface of the second insulating rod 20, the second insulating rod 20 is an externally threaded cylinder, the second conductive sleeve 19 can be fixed at any position on the second insulating rod 20, and a second conductor 17 is fixed on the outer surface of the second conductive sleeve 19.

[0028] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A segmented conductive insulating rod for measuring step time, comprising a constant temperature and constant speed water tank (1), characterized in that: The constant temperature and constant speed water tank (1) is provided with a segmented conductive insulating rod (2), the segmented conductive insulating rod (2) is fixedly connected to a slider (4), the slider (4) is slidably connected to the guide rail (3), the segmented conductive insulating rod (2) is provided with a first conductive cap (13), a first insulating rod (14) is clamped in the first conductive cap (13), a first conductive sleeve (15) is provided on the outer surface of the first insulating rod (14), a positioning nut (16) is provided on the outer surface of the first conductive sleeve (15), the first conductive cap (13) and the first conductive wire (12) are connected to each other. The first conductive sleeve (15) is electrically connected to the second conductive wire (17), the first conductive wire (12) and the second conductive wire (17) are respectively connected to the first channel (6) and the second channel (7) of the data acquisition instrument (5), the first channel (6) and the second channel (7) are respectively provided with a third conductive wire (8) and a fourth conductive wire (9), the third conductive wire (8) and the fourth conductive wire (9) are electrically connected to the output end of the constant voltage power supply (10), and the other output end of the constant voltage power supply (10) is electrically connected to the medium water in the constant temperature and constant speed water tank (1) through a fifth conductive wire (11); The segmented conductive insulating rod (2) is provided with a second conductive cap (18), the second conductive cap (18) is connected to the second insulating rod (20) via a thread, the outer surface of the second insulating rod (20) is provided with a second conductive sleeve (19), and the outer surface of the second conductive sleeve (19) is fixed with a second conductor (17); The first conductive cap (13) and the second conductive cap (18) are both designed to be streamlined.

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