基于SMS-FBG结构的温度应变双参数传感特性研究

Research on Temperature Strain Dual-parameters Sensing Characteristics Based on SMS-FBG Structure

摘要:

提出了一种基于单模-多模-单模(SMS)光纤干涉结构级联光纤布拉格光栅(FBG)的光纤微结构温度应变双参数测量传感器,并对其应变特性、温度特性进行了实验研究。通过采用光纤熔接手段将长度为35.5mm的多模光纤熔接在两段单模光纤之间,构成SMS光纤干涉结构,并通过级联FBG制成温度应变双参数测量传感器。结果证明,在200~2000με应变范围内,单模-多模-单模干涉结构和FBG的应变灵敏度分别为-2.31和1.22pm/με,线性度分别达到0.9992和0.9994；在580~700℃温度范围内,其温度灵敏度分别为58.79和13.64pm/℃,线性度分别达到0.9967和0.9982,可实现温度、应变双参数的同时测量。

Abstract:

A fiber micro structure temperature strain dual parameter measurement sensor based on singlemode-multimode-singlemode (SMS) optical fiber interference structure cascaded fiber Bragg grating (FBG) is proposed. Its strain characteristics and temperature characteristics were experimentally studied. The multimode optical fiber with a length of 35.5mm was fused between two singlemode optical fibers by means of optical fiber fusion to form a singlemode-multimode-singlemode optical fiber interference structure, and a temperature strain dual parameter measurement sensor was made by cascading FBGs. The results show that, in the strain range of 200~2000με, the strain sensitivity of singlemode-multimode-singlemode interference structure and FBG is -2.31 and 1.22pm/με respectively, and the linearity is 0.9992 and 0.9994 respectively. In the temperature range of 580~700℃, the temperature sensitivity of singlemode-multimode-singlemode interference structure and FBG is 58.79 and 13.64pm/℃ respectively, and the linearity reaches 0.9967 and 0.9982 respectively, which can realize simultaneous measurement of temperature and strain parameters.