【摘要】：光纖傳感器具有抗電磁干擾、靈敏度高、小巧、耐腐蝕等優(yōu)點(diǎn),因而在傳感領(lǐng)域具有廣泛的應(yīng)用。本文提出了基于光纖光柵與花生型光纖級(jí)聯(lián)結(jié)構(gòu)和基于傾斜光纖光柵與花生型光纖級(jí)聯(lián)結(jié)構(gòu)的兩種光纖傳感器,對(duì)其彎曲傳感特性和溫度傳感特性進(jìn)行了詳細(xì)研究。主要研究?jī)?nèi)容為:1、提出了一種基于光纖光柵與花生型光纖級(jí)聯(lián)結(jié)構(gòu)的全光纖傳感器。利用耦合模理論對(duì)該傳感器的彎曲傳感特性進(jìn)行了理論分析,花生型結(jié)構(gòu)的引入可以有效增強(qiáng)光纖光柵中纖芯模與包層模間的耦合。基于光束傳播法,選用仿真軟件Rsoft對(duì)花生型光纖結(jié)構(gòu)的光傳輸特性進(jìn)行了模擬分析。結(jié)果表明,花生型結(jié)構(gòu)能夠有效激發(fā)出包層模式,隨著花生型結(jié)構(gòu)雙球直徑的增加,基模功率逐漸降低。2、通過(guò)優(yōu)化控制光纖熔接機(jī)程序參數(shù),制作了花生型光纖結(jié)構(gòu)。將其與光纖光柵級(jí)聯(lián)熔接,構(gòu)成一種基于光纖光柵與花生型光纖級(jí)聯(lián)結(jié)構(gòu)的傳感器。搭建了基于該傳感器的全光纖傳感裝置,并對(duì)其彎曲、溫度傳感特性進(jìn)行了詳細(xì)的研究。實(shí)驗(yàn)結(jié)果表明,隨著光纖彎曲曲率增加,探測(cè)器接收到的包層模功率逐漸減小,而纖芯模功率則幾乎不變。當(dāng)光纖彎曲曲率由0增加2.2m-1,探測(cè)器接收到的包層模功率減小4.64dB。隨著環(huán)境溫度的增加,系統(tǒng)測(cè)量的反射光譜紅移。當(dāng)環(huán)境溫度從20℃逐漸升高到80℃時(shí),反射光譜峰值波長(zhǎng)向長(zhǎng)波方向移動(dòng)了0.6nm。而包層模、纖芯模功率未發(fā)生明顯的改變。3、提出并制作了一種基于傾斜光纖光柵與花生型光纖級(jí)聯(lián)結(jié)構(gòu)的光纖傳感器,搭建了基于該傳感器的全光纖傳感裝置,并對(duì)其彎曲傳感特性進(jìn)行了研究。研究發(fā)現(xiàn),傾斜光纖光柵的采用大大增加了傳感器的反射包層模功率量級(jí)。與基于FBG與花生型光纖級(jí)聯(lián)結(jié)構(gòu)的傳感器相比,反射功率包層模功率增加了38dB。而且包層模功率隨彎曲曲率的增加,逐漸減小。當(dāng)曲率由0 m-1增加1.77m-1時(shí),包層模功率改變了2dB。
[Abstract]:Optical fiber sensor has many advantages, such as anti-electromagnetic interference, high sensitivity, small size, corrosion resistance and so on, so it has a wide range of applications in the field of sensing. In this paper, two kinds of fiber sensors based on fiber grating and flower type fiber cascade structure and inclined fiber grating and flower type fiber cascade structure are proposed, and their bending sensing characteristics and temperature sensing characteristics are studied in detail. The main research contents are as follows: 1. An all-fiber sensor based on fiber grating and flower type fiber cascade structure is proposed. The bending sensing characteristics of the sensor are analyzed theoretically by using the coupling mode theory. The introduction of floral structure can effectively enhance the coupling between core mode and wrapped mode in fiber gratings. Based on the beam propagation method, the optical propagation characteristics of floral fiber structure are simulated and analyzed by using the simulation software Rsoft. The results show that the flower type structure can effectively excite the coating mode. With the increase of the diameter of the double sphere of the flower type structure, the fundamental mode power decreases gradually. 2. By optimizing the program parameters of the optical fiber welding machine, the flower type optical fiber structure is fabricated. A sensor based on fiber grating and flower type fiber cascade structure is constructed by concatenating it with fiber grating. An all-fiber sensing device based on the sensor is built, and its bending and temperature sensing characteristics are studied in detail. The experimental results show that with the increase of the bending curvature of the optical fiber, the power of the coating mode received by the detector decreases gradually, while the power of the core mode is almost unchanged. When the bending curvature of the optical fiber increases from 0 to 2.2 m 鈮，

本文編號(hào)：2481775