Temperature sensor calibration device and method

Abstract

The invention provides a temperature sensor calibration device, which comprises a constant temperature water tank, a constant temperature chamber and an intelligent control structure. The temperature sensor calibration device adopts the special constant temperature chamber for providing the stable work environment for the constant temperature water tank, and in addition, the data is collected for many times to obtain an average value, so the high-precision temperature calibration is realized. The temperature sensor calibration device also adopts a specially-made sensor interface plate, a plurality of sensors can be simultaneously calibrated by a standard sensor, simultaneously, a temperature control unit and the external cavity gas recovery are used for shortening the temperature stabilizing time, and the high-efficiency temperature calibration is realized. In addition, the calibration device provided by the invention has the advantages that the prior art is combined, the installation and the operation are simple, and the devices can be replaced, increased or decreased according to different use requirements, so the temperature sensor calibration device can be popularized and used in a large range.

Description

technical field [0001] The invention relates to the field of temperature sensors, in particular to a temperature sensor calibration device and method. Background technique [0002] Temperature sensors are used to monitor the temperature of objects in real time, and are widely used in experiments and industrial automation equipment. Due to the limitations of the inherent characteristics of the temperature sensor, it is often necessary to calibrate it before use, and the accuracy of the calibration result will directly affect the accuracy of the results of the temperature sensor, so the calibration of the temperature sensor is a prerequisite for the follow-up work . [0003] At present, there is a device and method for calibration of temperature sensors in the prior art. By inserting the standard sensor and the sensor to be calibrated into a container filled with alumina powder at the same time, the temperature of the alumina powder is raised by a heater, and by controlling t...

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Problems solved by technology

This method can achieve a wide range of temperature calibration, but because the temperature control accuracy of aluminum powder cannot maintain high precision under the device, the calibration accuracy is low

The calibration method requires strict control of time, such as the time from the temperature reaching the expected value to the temperature stabilization, and the time from the temperature stabilization to the temperature beginning to drop. These time constants need to be strictly measured and observed in actual operation, which increases the time required for the method The difficulty of use also limits the use of this method

[0004] A water tank constant temperature control device and method in the prior art, through forced liquid cooling, the cooling rate is much higher than that of natural cooling, avoiding the occurrence of overshoot, reducing the influence of thermal inertia, shortening the temperature control time, and reducing power consumption, but Due to the existence of cooling water pipes and electric heaters in the liquid tank, a large temperature gradient will be caused in the liquid tank. Even if there is an agitator to make the internal water temperature uniform, it is only approximately uniform, and the water temperature at a single control point will be Periodic fluctuations occur, thereby reducing the temperature control accuracy; on the other hand, in most of the control process, except for the cooling rate control, only one actuator is working, which can indeed reduce power consumption. However, these processes only occur when the temperature of the liquid tank is far from the set value, which relatively reduces the accuracy of the temperature control of the liquid tank

[0005] The deficiencies in the scope of use and calibration accuracy of the devices and methods of the above two patents are obvious in most of the existing temperature sensor calibration devices and methods. Therefore, a temperature sensor calibration device and method are needed, not only Can be widely used, and meet the high-precision, high-efficiency temperature calibration requirements

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