Temperature sensor dynamic calibration method based on dual temperature excitation

Abstract

The invention discloses a temperature sensor dynamic calibration method based on dual temperature excitation. According to the temperature sensor dynamic calibration method based on dual temperature excitation of the invention, by using the time interval between two response signals obtained after two temperatures excite a temperature sensor, the response speed range which can be measured by the dynamic calibration technology of the temperature sensor is improved. According to the method, the continuous approaching of the real time constant of the temperature sensor is realized gradually subtracting the time step s from the time interval of the pulse signals, and the mathematical model between relative deviation and critical relative deviation is established, so that the calibration precision of the time constant is improved.

Description

technical field [0001] The invention relates to the technical field of temperature sensor time constant calibration, in particular to a dynamic calibration method for a temperature sensor based on dual temperature excitation. Background technique [0002] A temperature sensor is a device that converts temperature into an electronic signal. It is widely used in modern industry. With the development of science and technology, there are more and more types of temperature sensors. According to the relationship between the temperature sensor and the measured object Relationships can be classified as contact and non-contact. But whether you use a contact temperature sensor or a non-contact temperature sensor for temperature measurement, if you want to get an accurate and reliable result, you must calibrate the temperature sensor. [0003] The calibration of the temperature sensor is divided into two parts: static calibration and dynamic calibration. The static calibration technol...

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Problems solved by technology

According to the current "JJF 1049-1995 Calibration Specification for Dynamic Response of Temperature Sensors", the dynamic calibration of temperature sensors mainly adopts the oil bath / water bath method and the hot wind tunnel method. The calibration methods for high-temperature fast response speed are mainly shock tube method and pulsed laser method, but there is a repeatability problem in the dynamic calibration of sensors applied in fast-response environments or non-fast-response environments, that is, using the same method for the same temperature When the sensor is calibrated multiple times, whether the peak fluctuation of the sensor response curve is within the allowable range of error, especially when the response curve is a unit impulse response curve, a small fluctuation of its peak value will cause a large change in the time constant

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