Research On The Temperature Control Of Blackbody Radiation Source Based On Fuzzy-PID

The traceability system of blackbody radiation source has made an important contribution to the development of radiation temperature measurement technology in our country.A key instrument is the blackbody radiation source in the traceability system of blackbody radiation source.The temperature control of the blackbody radiation source is a complex process with nonlinearity,time delay and thermal denaturation.The conventional PID control algorithm is most widely used for temperature control to solve this complex process in our country.However,the temperature control effects are needed to be improved.In order to achieve better temperature control effects,fuzzy PID control is proposed.The temperature control system of blackbody radiation source is studied in this paper.The simulation study of conventional PID control algorithm,fuzzy control algorithm and fuzzy PID control algorithm is carried out by using MATLAB/simulink.Taking NI cRIO-9024 as the controller of temperature control system,NI9472 source digital output module and heating film as actuator,the blackbody radiation source cavity as control object,cavity temperature as controlled parameter and voltage as control parameter,the experimental platform of the blackbody radiation source temperature control system is built.LabVIEW software is used to design the upper computer interface,set the target temperature and the parameters of the control system in real time,and control the temperature.The conventional PID control algorithm and fuzzy PID control algorithm are applied to the temperature control system of the blackbody source.The following are the specific research contents in this paper:1.Mathematical model and parameter identification of the blackbody radiation source are carried out.The fixed-point blackbody radiation source and its cavity structure are analyzed.According to the temperature control principle of the standard blackbody radiation source,the mathematical model of blackbody radiation source is deduced.And the data collected in the experiment are processed according to the least squares rule to obtain the transfer function of specific temperature control process.2.The simulation research of conventional PID control algorithm is carried out with MATLAB/simulink.The parameters are adjusted with Ziegler-Nichols parameter tuning method.The limitations of the conventional PID control algorithm are obtained.3.The simulation research of the fuzzy control algorithm is carried out.The fuzzy controller suitable for the control system is selected and the basic composition and structure of the fuzzy controller are analyzed.The fuzzy control algorithm and fuzzy PID control algorithm are simulated.The simulation results of the conventional PID control algorithm,the fuzzy control algorithm and the fuzzy PID control algorithm are compared.4.The design and experimental verification of the blackbody radiation source temperature control system were carried out.The hardware and software of the blackbody radiation source temperature control system are designed.The conventional PID control algorithm and the fuzzy PID control algorithm are applied to the blackbody radiation source temperature control system for experimental verification.It is shown from the experimental results that the fuzzy PID control algorithm has better control effects than the conventional PID control algorithm in the blackbody radiation source temperature control system,which is specifically reflected in the shorter adjustment time,the smaller overshoot,the smaller steady-state error in the temperature control system.