【摘要】：為了解決光纖傳感器中普遍存在的溫度和應(yīng)變交叉敏感問題,基于少模光纖的模間干涉原理,研究了LP01和LP02模式干涉的應(yīng)變和溫度傳感特性,詳細(xì)分析了模間干涉?zhèn)鞲械南辔混`敏度理論。結(jié)合少模光纖的數(shù)值仿真結(jié)果,設(shè)計了一種溫度不敏感的應(yīng)變傳感少模光纖,其纖芯直徑為15.1μm,在1550nm下纖芯折射率為1.4512,包層折射率為1.444。搭建了實驗系統(tǒng)來研究少模光纖溫度和應(yīng)變傳感特性,結(jié)果表明:理論計算能夠較好地預(yù)測實驗結(jié)果;少模光纖在0~600μm范圍內(nèi),應(yīng)變的相位靈敏度為0.0196rad/μm,在30~330℃范圍內(nèi),對溫度不敏感,可有效改善溫度和應(yīng)變的交叉敏感問題。
[Abstract]:In order to solve the problem of cross-sensitivity of temperature and strain in optical fiber sensors, the strain and temperature sensing characteristics of LP01 and LP02 mode interferometry are studied based on the principle of mode-to-mode interference of low-mode optical fiber. The phase sensitivity theory of inter-mode interference sensing is analyzed in detail. Based on the numerical simulation results of low-mode fiber, a temperature-insensitive strain sensing fiber with a core diameter of 15.1 渭 m, a core refractive index of 1.4512 and a cladding index of 1.444 was designed. The experimental system is built to study the temperature and strain sensing characteristics of the optical fiber. The results show that the theoretical calculation can predict the experimental results well, and the phase sensitivity of the strain is 0.0196rad/ 渭 m in the range of 0 ~ 600 渭 m, and the range of strain is 30 ~ 330 鈩，

本文編號：2291080