Study Of 2D Temperature Field Reconstruction Based On Compactly Supported Radial Basis Function

At present,China's economic and social development has entered a large amount of energy consumption stage,aggravated the rate of energy consumption,so it is urgent to promote the related work of energy saving and emission reduction.However,the pillar industry in our country is a high-energy consuming industry represented by chemical and metallurgical industry.The use of microwave to heat the industrial raw materials can greatly improve the energy utilization rate.However,the thermal runaway phenomenon in the microwave heating process will directly affect the production process.When it is serious,it may even burn out the production,cause the explosion and cause major safety accidents.Therefore,in order to use microwave energy more safely and efficiently,it is necessary to control the microwave source effectively,and the accurate perception of the temperature field in the heating medium determines the effectiveness of the control.Therefore,the real-time and accurate temperature field detection technology is the key to the efficient use of microwave energy.The temperature field measurement technology can be divided into contact-type temperature measurement and non-contact temperature measurement according to the difference of measurement methods.The contact-type temperature measurement method must be in contact with the measured medium directly,which make it difficult to be widely used in strong corrosion and ultra-high temperature environments.As a non-contact measurement technology,the ultrasonic temperature field measurement technology can reconstruct the temperature distribution only by collecting the ultrasonic signal in the measured area.Therefore,it has many advantages that do not affect the measured environment,wide detection range,and high measurement accuracy.At present,this technology has been successfully applied to storage grain temperature monitoring,industrial furnace temperature field monitoring and many other fields.This paper first introduces the research status of temperature field measurement technology at home and abroad,and details the principle of ultrasonic temperature reconstruction in non-contact temperature measurement.Then several main factors that affect the quality of the temperature field reconstruction are briefly described,and the selection of the ultrasonic flight time acquisition and the temperature field reconstruction algorithm is introduced in detail.Then,aiming at the problem of signal oscillation occurring during the measurement of ultrasonic time of flight,an ultrasonic flight time measurement method based on the maximum eigenvalue is proposed,and the high precision and strong anti-interference energy of the algorithm are verified through practical experiments.Finally,in view of the efficiency of the temperature field reconstruction,a temperature field reloading algorithm based on the compactly supported radial basis function is proposed,and the four typical two dimensional temperature field models are reconstructed with different ultrasonic transducer layout conditions and different noise intensity.The reconstruction results show that the reconstruction algorithm has good reconstruction precision and good operation efficiency.At the same time,the temperature field of 1m*1m region is reconstructed in the laboratory environment by using the proposed method of ultrasonic time of flight and the algorithm of temperature field reconstruction.The reconstruction results show that the proposed reconstruction algorithm also has good reconstruction accuracy,and the feasibility of the ultrasonic time measurement method is also proved.