Quick response temperature sensor time constant testing device and use method thereof

Abstract

The invention discloses a quick response temperature sensor time constant testing device and a use method thereof, and relates to the technical field of temperature sensor testing. The testing device comprises a water circulation system, a valve system, a temperature sensor, a flow meter and an upper computer. An outlet of the first constant-temperature water tank communicates with an inlet of the measuring pipeline through a first branch, and an outlet of the second constant-temperature water tank communicates with the inlet of the measuring pipeline through a second branch. An outlet of the measuring pipeline is communicated with an inlet of the first constant-temperature water tank through a third branch and communicated with an inlet of the second constant-temperature water tank through a fourth branch. And the speed regulating pump is arranged on the measuring pipeline. The valve system controls water circulation of the first constant-temperature water tank and water circulation of the second constant-temperature water tank, the temperature sensor measures the water temperature in the measuring pipeline, the flow meter displays the flow in the measuring pipeline, and the upper computer records measuring data of the temperature sensor. Compared with the prior art, the test precision and repeatability can be improved, and the test requirement of the temperature sensor with the small time constant can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature sensor testing, and in particular to a fast response temperature sensor time constant testing device and a use method thereof. Background Art

[0002] The measurement of sensor time constant is an important means to improve the measurement accuracy of CTD (conductivity temperature depth) and ensure the quality of CTD measurement data. Oceanographers have found in their research that the time constant of the sensor is closely related to the movement speed of the sensor or the water flow speed. The high-speed CTD requires a more accurate time constant as a matching parameter between C (conductivity) and T (temperature) to make the measured salinity results smoother and more in line with the real change trend. Its time constant is generally in the millisecond level.

[0003] The existing time constant testing device has a large uncertainty and is generally only used to test temperature sensors with a large time constant. It is difficult to meet the testing requirements of temperature sensors with a time constant within 70ms. Summary of the invention

[0004] The object of the present invention is to provide a fast-response temperature sensor time constant testing device and a use method thereof, so as to improve the test accuracy and meet the test requirements of temperature sensors with smaller time constants.

[0005] To achieve the above object, the present invention provides the following solutions: The invention discloses a fast response temperature sensor time constant testing device, comprising: A water circulation system, the water circulation system comprising a constant temperature water tank 1, a constant temperature water tank 2, a branch 1, a branch 2, a measuring pipeline, a branch 3, a branch 4 and a speed regulating pump; the outlet of the constant temperature water tank 1 is connected to the inlet of the measuring pipeline through the branch 1, and the outlet of the constant temperature water tank 2 is connected to the inlet of the measuring pipeline through the branch 2; the outlet of the measuring pipeline is connected to the inlet of the constant temperature water tank 1 through the branch 3, and the outlet of the measuring pipeline is connected to the inlet of the constant temperature water tank 2 through the branch 4; the speed regulating pump is installed on the measuring pipeline; A valve system, the valve system is used to control the water circulation of the first constant temperature water tank and the water circulation of the second constant temperature water tank; A temperature sensor, which is installed on the measuring pipeline and is a temperature sensor to be measured; A flow meter, which is installed on the measuring pipeline and is used to display the flow in the measuring pipeline; A host computer is electrically connected to the temperature sensor through an acquisition circuit to record measurement data of the temperature sensor.

[0006] Preferably, the valve system includes three-way valve 1 and three-way valve 2; port A of the three-way valve 1 is connected to the outlet of the constant temperature water tank 1 through the branch 1, and port B of the three-way valve 1 is connected to the outlet of the constant temperature water tank 2 through the branch 2; port A of the three-way valve 2 is connected to the inlet of the constant temperature water tank 1 through the branch 3, and port B of the three-way valve 2 is connected to the inlet of the constant temperature water tank 2 through the branch 4; port C of the three-way valve 1 is connected to port C of the three-way valve 2 through the measuring pipeline.

[0007] Preferably, the three-way valve one and the three-way valve two are both solenoid valves, and the host computer is electrically connected to the three-way valve one and the three-way valve two respectively through a valve control circuit to control the working states of the three-way valve one and the three-way valve two.

[0008] Preferably, the temperature field fluctuation and uniformity of the constant temperature water tank 1 and the constant temperature water tank 2 are both no greater than 0.05°C.

[0009] Preferably, the temperature difference between the water temperatures of the constant temperature water tank 1 and the constant temperature water tank 2 is greater than 10°C.

[0010] Preferably, the water temperature of the constant temperature water tank 1 is 30-35°C, and the water temperature of the constant temperature water tank 2 is 15-20°C.

[0011] Preferably, the host computer can automatically calculate the time constant according to the measurement data of the temperature sensor.

[0012] Preferably, the measurement error of the flow meter does not exceed 1%.

[0013] The present invention also discloses a method for using a fast response temperature sensor time constant testing device, which includes the following steps: Step 1: Fill the thermostatic water tank 1 and the thermostatic water tank 2 with water and heat them to a preset temperature range; Step 2: After the water temperatures of the thermostatic water tank 1 and the thermostatic water tank 2 are stable, the water in the thermostatic water tank 2 is passed into the measuring pipeline for 1 minute, and then the acquisition circuit is started to start the measurement; after measuring for 3 seconds, the water circulation of the thermostatic water tank 2 is closed, and the water in the thermostatic water tank 1 is passed into the measuring pipeline, and the measurement is ended after N seconds; N is greater than 10 times the time constant of the temperature sensor; during the measurement process of the temperature sensor, the flow data measured by the flow meter is observed, and the temperature sensor measurement data corresponding to the period in which the flow data remains stable is taken as the valid data; Step 3: The host computer calculates the time constant based on the measurement data of the temperature sensor.

[0014] Preferably, the water temperature of the thermostatic water tank 1 is 30-31°C, and the water temperature of the thermostatic water tank 2 is 19-20°C.

[0015] Compared with the related art, the present invention has achieved the following technical effects: The water temperature of thermostatic water tank 1 is set to be higher than that of thermostatic water tank 2. The valve system first opens the water circulation of thermostatic water tank 2 and closes the water circulation of thermostatic water tank 1, so that the temperature sensor measures the water temperature of thermostatic water tank 2. After that, the valve system closes the water circulation of thermostatic water tank 2 and opens the water circulation of thermostatic water tank 1, so that the temperature sensor measures the water temperature of thermostatic water tank 1. After the host computer records the measurement data, the time constant of the temperature sensor is calculated according to the definition of the time constant by manual calculation or host computer calculation.

[0016] The present invention uses the method of the temperature sensor being stationary while the water body is flowing for testing and evaluation, which greatly reduces the initial contact time between the temperature sensor and the water body, thereby obtaining more stable and reliable data. The flow meter monitors the water flow rate as experimental quality control data to ensure that the flow rate in the measuring pipeline is consistent during the above two measurements by the temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Schematic diagram of a time constant testing device for a fast response temperature sensor according to an embodiment of the present invention.

[0019] In the figure: 1-host computer; 2-collection circuit; 3-valve control circuit; 4-constant temperature water tank 1; 5-constant temperature water tank 2; 6-three-way valve 1; 7-three-way valve 2; 8-temperature sensor; 9-speed regulating pump; 10-flow meter. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The object of the present invention is to provide a fast-response temperature sensor time constant testing device and a use method thereof, so as to improve the test accuracy and meet the test requirements of temperature sensors with smaller time constants.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figure 1 This embodiment provides a fast response temperature sensor time constant testing device, including a water circulation system, a valve system, a temperature sensor 8, a flow meter 10 and a host computer 1.

[0024] The water circulation system includes a constant temperature water tank 1 4, a constant temperature water tank 2 5, a branch 1, a branch 2, a measuring pipeline, a branch 3, a branch 4 and a speed regulating pump 9. The outlet of the constant temperature water tank 1 4 is connected to the inlet of the measuring pipeline through the branch 1, and the outlet of the constant temperature water tank 2 5 is connected to the inlet of the measuring pipeline through the branch 2. The outlet of the measuring pipeline is connected to the inlet of the constant temperature water tank 1 4 through the branch 3, and the outlet of the measuring pipeline is connected to the inlet of the constant temperature water tank 2 5 through the branch 4. The speed regulating pump 9 is installed on the measuring pipeline.

[0025] The valve system is used to control the water circulation of the thermostatic water tank 1 4 and the water circulation of the thermostatic water tank 2 5. The temperature sensor 8 is installed on the measuring pipeline and is a measured temperature sensor for measuring the water temperature in the measuring pipeline. The flow meter 10 is installed on the measuring pipeline and is used to display the flow in the measuring pipeline. The host computer 1 is electrically connected to the temperature sensor 8 through the acquisition circuit 2 to record the measurement data of the temperature sensor 8.

[0026] The working principle of the fast response temperature sensor time constant test device of this embodiment is as follows: The water temperature of the thermostatic water tank 1 4 is set to be higher than the water temperature of the thermostatic water tank 2 5. The valve system first opens the water circulation of the thermostatic water tank 2 5 and closes the water circulation of the thermostatic water tank 1 4, so that the temperature sensor 8 measures the water temperature of the thermostatic water tank 2 5. After that, the valve system closes the water circulation of the thermostatic water tank 2 5 and opens the water circulation of the thermostatic water tank 1 4, so that the temperature sensor 8 measures the water temperature of the thermostatic water tank 1 4. After the host computer 1 records the measurement data, the time constant of the temperature sensor 8 is calculated according to the definition of the time constant by manual calculation or calculation by the host computer 1. The pumping speed of the speed regulating pump 9 is adjustable, so that the flow in the measuring pipeline is controlled within a preset range.

[0027] This embodiment uses the method of stationary temperature sensor 8 and flowing water to perform test evaluation, which greatly reduces the initial contact time between temperature sensor 8 and water, thereby obtaining more stable and reliable data. Flow meter 10 monitors the water flow rate as experimental quality control data to ensure that the flow rate in the measuring pipeline of temperature sensor 8 is consistent during the above two measurements.

[0028] As a possible example, in this embodiment, the valve system includes a three-way valve 1 6 and a three-way valve 2 7. The A port of the three-way valve 1 6 is connected to the outlet of the thermostatic water tank 1 4 through the branch 1, and the B port of the three-way valve 1 6 is connected to the outlet of the thermostatic water tank 2 5 through the branch 2. The A port of the three-way valve 2 7 is connected to the inlet of the thermostatic water tank 1 4 through the branch 3, and the B port of the three-way valve 2 7 is connected to the inlet of the thermostatic water tank 2 5 through the branch 4. The C port of the three-way valve 1 6 is connected to the C port of the three-way valve 2 7 through the measuring pipeline.

[0029] Compared with the method of respectively setting valves on branch one, branch two, branch three and branch four, this embodiment only needs to set two three-way valves to control the on and off of the four branches, thereby reducing the number of valves and reducing costs.

[0030] As a possible example, in this embodiment, the three-way valve 1 6 and the three-way valve 2 7 are both solenoid valves, and the upper computer 1 is electrically connected to the three-way valve 1 6 and the three-way valve 2 7 through the valve control circuit 3 to control the working status of the three-way valve 1 6 and the three-way valve 2 7.

[0031] Compared with the method of using a manual three-way valve, this embodiment electrically controls the two three-way valves so that the two three-way valves can be operated simultaneously, thereby improving the degree of automation.

[0032] Exemplarily, the operating voltage of the three-way valve 1 6 and the three-way valve 2 7 is 24V.

[0033] Exemplarily, the sampling frequency of the acquisition circuit 2 is above 1 kHz.

[0034] Exemplarily, the temperature field fluctuation and uniformity of the constant temperature water tank 1 4 and the constant temperature water tank 2 5 are both no greater than 0.05°C.

[0035] Furthermore, the temperature field fluctuation and uniformity are preferably 0.03°C, more preferably 0.01°C.

[0036] As a possible example, in this embodiment, the temperature difference between the water in the constant temperature water tank 1 4 and the constant temperature water tank 2 5 is greater than 10°C.

[0037] Exemplarily, the water temperature of the constant temperature water tank 1 4 is 30-35°C, and the water temperature of the constant temperature water tank 2 5 is 15-20°C.

[0038] Further, the water temperature of the thermostatic water tank 1 4 is preferably 30-33° C., and the water temperature of the thermostatic water tank 2 5 is preferably 17-20° C. The water temperature of the thermostatic water tank 1 4 is more preferably 30-31° C., and the water temperature of the thermostatic water tank 2 5 is more preferably 19-20° C.

[0039] As a possible example, in this embodiment, the host computer 1 can automatically calculate the time constant according to the measurement data of the temperature sensor 8. By presetting a program in the host computer 1, the time constant of the temperature sensor 8 is calculated according to the definition of the time constant. Compared with the manual calculation method, the calculation speed is accelerated and the accuracy of the calculation result is improved.

[0040] Exemplarily, the host computer 1 can also draw a curve showing the temperature monitored by the temperature sensor 8 changing over time.

[0041] Exemplarily, the measurement error of the flow meter 10 does not exceed 1%, thereby more accurately monitoring the flow in the measurement pipeline.

[0042] This embodiment also provides a method for using a fast response temperature sensor time constant test device, using the fast response temperature sensor time constant test device, including the following steps: Step 1: Fill the thermostatic water tank 1 4 and the thermostatic water tank 2 5 with water and heat them to a preset temperature range.

[0043] Step 2: After the water temperature of the thermostatic water tank 1 4 and the thermostatic water tank 2 5 is stable, the water in the thermostatic water tank 2 5 is passed into the measuring pipeline for 1 minute, and then the acquisition circuit 2 is started to start the measurement. After measuring for 3 seconds, the water circulation of the thermostatic water tank 2 5 is closed, and the water in the thermostatic water tank 1 4 is passed into the measuring pipeline, and the measurement is ended after N seconds. N is greater than 10 times the time constant of the temperature sensor 8. During the measurement process of the temperature sensor 8, the flow data measured by the flow meter 10 is observed, and the temperature sensor 8 measurement data corresponding to the period when the flow data remains stable is taken as the valid data.

[0044] Step 3: The host computer 1 calculates the time constant according to the measurement data of the temperature sensor 8.

[0045] Since the method of use uses the above-mentioned fast response temperature sensor time constant testing device, it also has the above-mentioned advantages of the fast response temperature sensor time constant testing device, which will not be described in detail here.

[0046] Comparative Example 1 The time constant test device of Beijing Great Wall Metrology and Testing Technology Institute of China Aviation Industry Corporation was used. The test principle is that the robot arm controls the movement trajectory of the temperature sensor, and puts it into the constant temperature water tank from the air. The voltage curve of the temperature sensor is collected by the oscilloscope to calculate its time constant. The time constant of the 0833 type 23102# and 23103# fast response temperature sensors is tested, and the test results are as follows:

[0047] It can be seen that the repeatability of the measurement results is about 20%~30% compared with the average value, which is not negligible. Therefore, the credibility of the test results is low, and a large amount of test data is required to obtain the true value.

[0048] Example 1 The fast response temperature sensor time constant test device of this embodiment is used to test the time constants of the 0833 type 23102# and 23103# fast response temperature sensors. The test results are as follows:

[0049] It can be seen that the repeatability of the test results of this device is far lower than that of the existing device, accounting for only about 4%. It only takes 3 to 5 times to obtain the true value, which can greatly improve the test efficiency.

[0050] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A fast response temperature sensor time constant test device, characterized in that: include: A water circulation system, the water circulation system comprising a constant temperature water tank 1, a constant temperature water tank 2, a branch 1, a branch 2, a measuring pipeline, a branch 3, a branch 4 and a speed regulating pump; the outlet of the constant temperature water tank 1 is connected to the inlet of the measuring pipeline through the branch 1, and the outlet of the constant temperature water tank 2 is connected to the inlet of the measuring pipeline through the branch 2; the outlet of the measuring pipeline is connected to the inlet of the constant temperature water tank 1 through the branch 3, and the outlet of the measuring pipeline is connected to the inlet of the constant temperature water tank 2 through the branch 4; the speed regulating pump is installed on the measuring pipeline; A valve system, the valve system is used to control the water circulation of the first constant temperature water tank and the water circulation of the second constant temperature water tank; A temperature sensor, which is installed on the measuring pipeline and is a temperature sensor to be measured; A flow meter, which is installed on the measuring pipeline and is used to display the flow in the measuring pipeline; A host computer is electrically connected to the temperature sensor through an acquisition circuit to record measurement data of the temperature sensor.

2. The fast response temperature sensor time constant testing device according to claim 1, characterized in that: The valve system includes three-way valve 1 and three-way valve 2; port A of the three-way valve 1 is connected to the outlet of the constant temperature water tank 1 through the branch 1, and port B of the three-way valve 1 is connected to the outlet of the constant temperature water tank 2 through the branch 2; port A of the three-way valve 2 is connected to the inlet of the constant temperature water tank 1 through the branch 3, and port B of the three-way valve 2 is connected to the inlet of the constant temperature water tank 2 through the branch 4; port C of the three-way valve 1 is connected to port C of the three-way valve 2 through the measuring pipeline.

3. The fast response temperature sensor time constant testing device according to claim 2, characterized in that: The three-way valve 1 and the three-way valve 2 are both solenoid valves, and the host computer is electrically connected to the three-way valve 1 and the three-way valve 2 respectively through a valve control circuit to control the working states of the three-way valve 1 and the three-way valve 2.

4. The fast response temperature sensor time constant testing device according to claim 1, characterized in that: The temperature field fluctuation and uniformity of the constant temperature water tank 1 and the constant temperature water tank 2 are both no greater than 0.05°C.

5. The fast response temperature sensor time constant testing device according to claim 1, characterized in that: The temperature difference between the water in the constant temperature water tank 1 and the constant temperature water tank 2 is greater than 10°C.

6. The fast response temperature sensor time constant testing device according to claim 5, characterized in that: The water temperature of the constant temperature water tank 1 is 30-35°C, and the water temperature of the constant temperature water tank 2 is 15-20°C.

7. The fast response temperature sensor time constant testing device according to claim 1, characterized in that: The host computer can automatically calculate the time constant according to the measurement data of the temperature sensor.

8. The fast response temperature sensor time constant testing device according to claim 1, characterized in that: The measurement error of the flow meter does not exceed 1%.

9. A method for using a fast response temperature sensor time constant test device, using the fast response temperature sensor time constant test device as claimed in any one of claims 1 to 8, characterized in that: The steps include: Step 1: Fill the thermostatic water tank 1 and the thermostatic water tank 2 with water and heat them to a preset temperature range; Step 2: After the water temperatures of the thermostatic water tank 1 and the thermostatic water tank 2 are stable, the water in the thermostatic water tank 2 is passed into the measuring pipeline for 1 minute, and then the acquisition circuit is started to start the measurement; after measuring for 3 seconds, the water circulation of the thermostatic water tank 2 is closed, and the water in the thermostatic water tank 1 is passed into the measuring pipeline, and the measurement is ended after N seconds; N is greater than 10 times the time constant of the temperature sensor; during the measurement process of the temperature sensor, the flow data measured by the flow meter is observed, and the temperature sensor measurement data corresponding to the period in which the flow data remains stable is taken as the valid data; Step 3: The host computer calculates the time constant based on the measurement data of the temperature sensor.

10. The method for using the fast response temperature sensor time constant testing device according to claim 9, characterized in that: The water temperature of constant temperature water tank 1 is 30~31℃, and the water temperature of constant temperature water tank 2 is 19~20℃.

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