Temperature sensor response time and precision measuring device

Abstract

The invention discloses a temperature sensor response time and precision measuring device which comprises a hardware part and a software part which are electrically connected through an electric signal. The hardware part comprises a data acquisition card, a high-precision constant-current source, a direct-current voltage source, a two-axis motion module, a servo motor, a test cabinet, a tool jig, a low-resistance tester and a constant-temperature water tank. According to the invention, the resistance measurement precision can reach 0.01%, simultaneous measurement of eight channels can be realized, the copper part of the sensor is completely immersed in water during measurement, the time required by the change of the resistance value of the sensor along with the temperature (25-62.9 DEG C) does not exceed 3.3 s, and the measurement precision is improved. The operation interface of the software part is simple and attractive, the operation process is clear, the man-machine interaction degree is high, and parameters are convenient to configure.

Description

Technical Field

[0001] The present invention belongs to the technical field of sensors, and particularly relates to a device for measuring the response time and accuracy of a temperature sensor. Background Technique

[0002] Temperature sensors are widely used in many fields such as industry, agriculture, meteorology, and transportation. In some special application scenarios, the temperature to be detected may change rapidly, such as the application of radiosondes in meteorological monitoring and rapid thermal annealing applications in industrial control. These applications have requirements for the response time characteristics of temperature sensors, and relevant measurement devices are needed to detect them.

[0003] The response time of a temperature sensor needs to generate a temperature step signal through a specific device and record the dynamic response characteristics of the sensor under the temperature step. However, the measurement accuracy of traditional temperature sensor measurement devices is not high enough. Therefore, there is an urgent need for a temperature sensor measurement device that can improve the measurement accuracy. Summary of the Invention

[0004] The main purpose of the present invention is to provide a device for measuring the response time and accuracy of a temperature sensor, which solves the problem that the existing temperature sensor measurement accuracy is not high enough.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a device for measuring the response time and accuracy of a temperature sensor, including a hardware part and a software part. The hardware part and the software part are electrically connected through electrical signals. The hardware part includes a data acquisition card, a high-precision constant current source, a DC voltage source, a two-axis motion module, a servo motor, a test cabinet, a tooling fixture, a low-resistance tester, and a constant temperature water bath.

[0006] Further, the hardware part is controlled by an industrial control computer.

[0007] Further, the tooling fixture adopts a special connector to facilitate the rapid loading and unloading of the sensor.

[0008] Further, the constant temperature water bath includes a low-temperature water bath and a high-temperature water bath.

[0009] Further, the positioning accuracy of the two-axis motion module is ±0.05 mm

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The present invention drives the fixture loaded with products through a two-axis motion module to immerse the sensor in a low-temperature water bath for heat preservation for a period of time, and then moves it to an 85°C high-temperature constant-temperature water bath. The system consists of a constant current source and a data acquisition card to measure the response time of a PT1000 to a temperature change from 25 - 62.9°C in a four-wire system. At the same time, in the low-temperature water bath and the high-temperature water bath, a multi-channel DC low-resistance tester measures the accuracy of the output resistance of the PT1000 sensor at the current temperature. The software part calculates the corresponding temperature error through an algorithm, improving the measurement accuracy.

[0012] 2. The resistance measurement accuracy of the present invention can reach 0.01%, and it can measure 8 channels simultaneously, improving the measurement accuracy.

[0013] 3. The software part of the present invention has a simple and beautiful operation interface, a clear operation process, a high degree of human-computer interaction, and convenient parameter configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a system flow chart of a device for measuring the response time and accuracy of a temperature sensor according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] See Figure 1 , the present invention discloses a device for measuring the response time and accuracy of a temperature sensor, including a hardware part and a software part. The hardware part and the software part are electrically connected through electrical signals. The hardware part includes a data acquisition card, a high-precision constant current source, a DC voltage source, a two-axis motion module, a servo motor, a test cabinet, a tooling fixture, a low-resistance tester, and a constant-temperature water bath.

[0017] Furthermore, the software part is customized according to the test requirements. Further, the hardware part is controlled by an industrial computer. According to the product test requirements, the system conducts PT1000 temperature response tests and accuracy tests at different temperatures.

[0018] Furthermore, the tooling fixture of the present invention can be customized, and 8 products can be tested simultaneously. The tooling fixture uses a special connector, which is convenient for the quick loading and unloading of the sensor.

[0019] Furthermore, the constant-temperature water bath includes a low-temperature water bath and a high-temperature water bath.

[0020] Specifically: Low-temperature water bath: accuracy of 0.01°C; temperature range: -5 to 100°C; temperature fluctuation: ±0.005 to 0.01°C;

[0021] High-temperature water bath: accuracy of 0.01°C; temperature range: 10 to 100°C; temperature fluctuation: ±0.005 to 0.01°C;

[0022] The present invention is a micro industrial control all-in-one machine, which is small in size and has many interfaces.

[0023] Further, the positioning accuracy of the two-axis motion module is ±0.05 mm.

[0024] Further, the waterproof level of the servo motor of the present invention is IP65.

[0025] The working principle of the present invention: The two-axis motion module drives the fixture loaded with products to immerse the sensor in the low-temperature water bath for heat preservation for a period of time, and then moves it to the 85°C high-temperature constant-temperature water bath. The system consists of a constant current source and a data acquisition card to measure the response time of the four-wire PT1000 to the temperature change from 25 to 62.9°C. At the same time, in the low-temperature water bath and the high-temperature water bath, a multi-channel DC low-resistance tester tests the accuracy of the output resistance of the PT1000 sensor at the current temperature. The software part calculates the corresponding temperature error through an algorithm. This device is compatible with the simultaneous testing of 8 products, and the normal testing time is about 22S / PCS (under the condition of stable water temperature), including the response time and the accuracy test at 2 points (1 low temperature and 1 high temperature).

[0026] The resistance measurement accuracy of the present invention can reach 0.01%, and it can measure 8 channels simultaneously, improving the measurement accuracy.

[0027] When the present invention is measuring, the copper part of the sensor is completely immersed in water, and the time required for the sensor resistance to change with temperature (25°C to 62.9°C) does not exceed 3.3 s.

[0028] The software part of the present invention has a simple and beautiful operation interface, a clear operation process, a high degree of human-computer interaction, and convenient parameter configuration.

[0029] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A temperature sensor response time and accuracy measurement device, characterized in that: It includes a hardware part and a software part. The hardware part and the software part are electrically connected through electrical signals. The hardware part includes a data acquisition card, a high-precision constant current source, a DC voltage source, a two-axis motion module, a servo motor, a test cabinet, a tooling fixture, a low resistance tester and a constant temperature water tank.

2. A temperature sensor response time and accuracy measurement device according to claim 1, characterized in that: The hardware part is controlled by an industrial computer.

3. A temperature sensor response time and accuracy measurement device according to claim 1, characterized in that: The tooling fixture adopts a special joint to facilitate quick installation and removal of the sensor.

4. A temperature sensor response time and accuracy measurement device according to claim 1, characterized in that: The constant temperature water tank comprises a low temperature water tank and a high temperature water tank.

5. The temperature sensor response time and accuracy measuring device according to claim 1, characterized in that: The positioning accuracy of the two-axis motion module is ±0.05mm.

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