Temperature Sensor's Dynamic Characteristic Analysis In Transient High Temperature Environment And Its Application Of Explosion Temperature Test

During the process of the construction of national defense cause,with the rapid development of ammunition weapons,higher requirements of explosion temperature test technology is put forward at the side of the assessment of thermal effect of the temperature field caused by ammunition explosion.When explosion occurs,the fireball owns the characters of high temperature,short action time,and intense change.Besides,there are so many other strong interference elements.As a result,it is too hard to test the explosion temperature.Experiences show that if non-contact temperature measurement method is used in explosion test,it will be difficult to obtain the actual explosive emissivity,and will cause great measurement error at the same time.So the contact temperature measurement method,for example,the method using thermocouple is widely used currently.What matters is that during the test of transient high temperature by thermocouple,due to the thermal inertia of the sensor itself and the limited heat conduction,the dynamic response error is still existing between the value of the thermocouple and the actual value of the measured object.Besides,it is important that the size of the error is closely related with the thermocouple's dynamic characteristic in its specific temperature field.For the test of the transient high temperature in flame temperature field,this paper based on the theory of contact temperature measurement,which proposed a new kind of means that named high temperature flame method to analyze the dynamic response characteristic of the thermocouple.Firstly,the time constant of the thermocouple under the laboratory conditions is obtained by this means,in other words,the thermocouple's dynamic characteristic in flame temperature field is obtained.Secondly,because the thermocouple's dynamic response characteristic couldn't meet the requirements of the explosion temperature test,the paper based on the result that obtained with the high temperature flame method of the experiment and by the means of particle swarm optimization(PSO)in MATLAB environment and system's inverse modeled established the sensor's dynamic compensation filter model.That is to say,the dynamic characteristic of the thermocouple in flame temperature field is compensated.Thirdly,the paper took FPGA as a core,designed and completed a transient high temperature test and storage system,then applied it in explosion site,and obtained the measured temperature of the fireball.Finally,the thermocouple's dynamic compensation filter model is used and the measured value of the fireball is corrected successfully.In summary,the high temperature flame method proposed in this paper has some reference value for evaluating the actual dynamic response characteristic of the thermocouple in flame temperature field,and the data processed methods used in this paper also play important roles in eliminating some of the error factors in dynamic testing.The design of the transient high temperature test and storage system in this paper not only can meet the requirements of the explosion temperature test,but it is reliable and easy to use.Last but not the least,the dynamic compensation results also can provide a reliable actual measurement basis for the development and the power assessment of ammunition.