无胶化封装的光纤Bragg光栅高温应变传感器及其特性研究

Non-Gel Encapsulation Process of a High Temperature Strain Fiber Bragg Grating Sensor and Its Sensing Properties

提出了一种全新的具有极好温度自校正能力的光纤Bragg光栅高温应变传感器结构,并提供一种新的封装方式能够实现在250℃高温环境下应变的高精度测量并且具有极好的稳定性和重复性,可应用于250℃左右的环境下大型机械等接触式高精度应变测量,另外该结构简单能够实现量产,对高温环境下的工程应用具有很好的实用价值。通过实验获得传感器在250℃左右的应变测量灵敏度约为369.4 pm/N,线性度为R2=0.999 2。

A novel fiber Bragg grating（FBG）high-temperature strain sensor with an effective temperature compensation structure is proposed and demonstrated.A new approach for encapsulation of FBG with high-temperature strain sensing structure is presented,which can realize the high-precision measurement of the strain which is achieved around 250 ℃.The experimental results show that the proposed non-gel encapsulation method of FBG with high-temperature strain sensing structure has excellet stability and repeatability.It is applicable to measure the contact-type and high-precision strain of large machinery in about 250 ℃ environment and furthermore,this structure is simple and thus it is able to achieve mass production.Therefore,it has excellect practical value for the engineering application in high-temperature environment.The strain sensitivity obtained in our experiment is about 369.4 pm/N,while the linearity is R2=0.999 2.