Sapphire Fiber Optic Blackbody Cavity High Temperature Sensor System

Temperature is closely related to people's lives and an important factor that involves in various fields of human activities,so the measurement and control on it is usually necessary,especially in high-temperature field with over 1000 C,but currently,the measurement in high temperature field is not easy.At present,high temperature measurement technology is mainly divided into contact-type and non-contact-type.On one hand,various types of thermocouple sensor are used in contact temperature measurement technology.Thermocouple technology is early developed,relatively mature and widely used.However,it also has some obvious flaws,namely,high price,great loss,susceptible to the temperature environment limit,and can't meet the needs of high temperature measurement field.On the other hand,non-contact temperature measurement technology is favored by researchers due to its fast response,strong anti-interference ability,as well as long-term and stable measurement under high-temperature environment.In this paper,it researches a sapphire fiber-based blackbody cavity radiation thermometry.In this paper,it designs and produces sapphire fiber blackbody cavity high temperature sensor system,which is mainly composed of two parts:sapphire fiber blackbody cavity sensor head and system electronics.First of all,this paper introduces the structure and production process of sapphire fiber blackbody cavity sensor head.The sensor head is made of sapphire fiber with one end sputtered metal film,and it achieves the sensing from temperature to light energy.Secondly,it introduces sensor circuit,that mainly composed of photoelectric conversion module,pretreatment module,operational amplifier module,A/D conversion sampling module,signal processing module and power modules;besides,the function and principle of each module are also analyzed.Thirdly,the least-squares curve fitting is used to have sensor calibration.After the calibration,several temperature measurement experiments are carried out on standard BR1450 blackbody furnace in the laboratory.Finally,the paper presents and analyzes the measurement results.Experimental results show that the sapphire fiber blackbody cavity temperature sensor system that designed in this paper has accurate measurement,excellent repeatability,system stability,fast response and high accuracy,which meets the design requirements under laboratory conditions.