【摘要】：光纖傳感器因其結(jié)構(gòu)簡單、靈敏度高、抗電磁干擾等特點(diǎn)廣泛的應(yīng)用于航天航空、冶金、醫(yī)療等領(lǐng)域中。其中干涉型光纖傳感器光學(xué)穩(wěn)定性高、動態(tài)響應(yīng)范圍大,可以長期工作于高壓、高溫、強(qiáng)腐蝕等特殊環(huán)境下。近十幾年,國內(nèi)外學(xué)者的研究重點(diǎn)都在干涉型光纖傳感器上。本文在干涉型傳感器研究的基礎(chǔ)上結(jié)合磁場測量的相關(guān)技術(shù)設(shè)計并制作出三種實(shí)現(xiàn)磁場、溫度雙參量同時測量的新型傳感結(jié)構(gòu)。傳感結(jié)構(gòu)由花生錐結(jié)構(gòu)為主,結(jié)合多模光纖、光纖光柵、錐結(jié)構(gòu)組成。主要內(nèi)容如下:1.簡述了光纖傳感器的研究背景、意義、分類和特點(diǎn);Inline干涉型光纖傳感器及Inline MZI研究現(xiàn)狀。2.主要對Inline MZI和光纖光柵的傳感原理進(jìn)行了分析。3.提出了一種基于花生錐結(jié)構(gòu)和多模光纖的磁場傳感器。分析其傳感原理并且進(jìn)行了實(shí)驗(yàn)研究,分別對磁場和溫度特性進(jìn)行實(shí)驗(yàn)數(shù)據(jù)測量,并結(jié)合敏感矩陣實(shí)現(xiàn)了雙參量同時測量。兩個花生錐結(jié)構(gòu)構(gòu)成的MZI產(chǎn)生兩種干涉峰,一種是纖芯與纖芯模式干涉形成的干涉峰,另一種是纖芯與包層模式干涉形成的干涉峰。實(shí)驗(yàn)表明只有纖芯與包層模式形成的干涉峰對磁場強(qiáng)度敏感,磁場靈敏度為0.0478nm/mT。另外,還對該結(jié)構(gòu)進(jìn)行了溫度實(shí)驗(yàn),兩種干涉峰都對溫度敏感,靈敏度分別為0.06nm/℃和0.0526nm/℃。4.提出了一種基于花生錐結(jié)構(gòu)級聯(lián)LPFG的光纖磁場傳感器。外界磁場強(qiáng)度從0m T變化至20mT,Dip1和Dip2兩個干涉谷的磁場靈敏度系數(shù)分別為-0.064nm/mT和-0.0413nm/mT。溫度特性實(shí)驗(yàn)中Dip1和Dip2溫度靈敏度高達(dá)0.2328nm/℃和0.1857nm/℃。5.提出了一種基于花生錐結(jié)構(gòu)和錐結(jié)構(gòu)、FBG級聯(lián)的光纖磁場傳感器。當(dāng)磁場強(qiáng)度由0mT變化到20mT時,MZI干涉峰靈敏度為0.11nm/mT。溫度特性實(shí)驗(yàn)測得MZI干涉峰和FBG透射峰的溫度靈敏度分別為0.4015nm/℃和0.0114nm/℃。
[Abstract]:Optical fiber sensors are widely used in aerospace, metallurgy, medical and other fields because of its simple structure, high sensitivity, anti-electromagnetic interference and other characteristics. The interferometric optical fiber sensor has high optical stability and large dynamic response range. It can work in special environments such as high pressure, high temperature and strong corrosion for a long time. In recent years, the research focus of scholars at home and abroad is on interferometric optical fiber sensors. In this paper, based on the research of interferometric sensors, three new sensing structures are designed and fabricated, which realize the simultaneous measurement of magnetic field and temperature with two parameters. The sensing structure is composed of peanut cone structure, multi-mode fiber, fiber grating and cone structure. The main content is as follows: 1. In this paper, the research background, significance, classification and characteristics of fiber optic sensor based on Inline interferometer and its research status of Inline MZI are briefly introduced. The sensing principle of Inline MZI and fiber grating is analyzed. A magnetic field sensor based on peanut cone structure and multi-mode optical fiber is proposed. The sensing principle is analyzed and the experimental research is carried out. The experimental data of the magnetic field and the temperature are measured, and the two-parameter simultaneous measurement is realized in combination with the sensitivity matrix. The MZI with two peanut cone structures produces two interference peaks, one is the interference peak between the core and the core mode, the other is the interference peak between the core and the cladding mode. The experimental results show that only the interference peak formed by the core and cladding mode is sensitive to the magnetic field intensity, and the magnetic field sensitivity is 0.0478nm / mT. In addition, the temperature experiments of the structure were carried out. Both interference peaks were sensitive to temperature and the sensitivities were 0.06nm/ 鈩，

本文編號：2160224