Study On Theoretical Analysis Of Dynamic Response Theory With High Speed Temperature Sensor

The rapid development of national defense,aerospace and other fields in recent years has put forward high requirements for temperature detection speed,and the corresponding small-scale high-speed temperature sensor has also been developed at home and abroad.However,when the high-speed temperature sensor is manufactured,it is difficult to evaluate its dynamic response performance scientifically and objectively by using traditional experimental methods,which hinders the high-speed measurement to a certain extent The development of temperature technology.This paper systematically analyzes the dynamic response characteristics of the temperature sensor,points out that there are some uncertainty problems in the principle of experimental test methods,and according to the basic concept of dynamic response,considering the heat transfer process in the working process of the sensor,puts forward a new theoretical analysis method and experimental test principle of the dynamic response of the high-speed temperature sensor.Based on the frequency domain response model of small size and high speed temperature sensor with slender shape,the mechanism of how the parameters under the model affect the dynamic response ability of the sensor is analyzed.The theoretical analysis of the dynamic response characteristics of the high-speed temperature sensor shows that:(1)there are great differences in the test results of the time constant of the same temperature sensor by the existing test methods,mainly because the ideal temperature step signal cannot be generated during the test process.(2)It is difficult to truly reflect the dynamic response performance of the existing high-speed temperature sensor with time constant,because the time constant of the temperature sensor is based on the zero dimension lumped parameter model,which is difficult to apply to the smallscale high-speed temperature sensor.(3)The frequency response transmitted by temperature can measure the dynamic response ability of temperature sensor more objectively.In the test experiment designed according to this principle,the sinusoidal temperature signal is easier to produce and the experimental error is smaller than the step temperature signal.After the physical modeling of the temperature sensing process of the temperature sensor,it is concluded that the dynamic response ability of the small-scale temperature sensor with slender shape is not only affected by the physical parameters of the sensor and the convective heat transfer coefficient of the sensor boundary,but also by the length of the temperature sensor.The longer the sensor is,the worse its internal heat conduction ability is,and the more difficult the heat input from the heat transfer interface is The internal transportation of the sensor results in the temperature accumulation at the interface,and the dynamic response performance of the temperature sensor decreases.At the same time,the dynamic response ability of different positions of the sensor is also inconsistent.The farther away from the heat transfer interface,the worse the dynamic response performance.The position farthest from the heat source becomes the short plate of the overall dynamic response of the temperature sensor,which ultimately determines the dynamic response performance of the sensor.Therefore,in the design of high-speed temperature sensor,the geometric shape and size of the sensor must be controlled to ensure its good dynamic response performance in theory.