發(fā)布時(shí)間：2018-04-27 04:33

  本文選題：錐形光纖光柵 + 傳輸矩陣法��； 參考：《南京郵電大學(xué)》2017年碩士論文

【摘要】：光纖光柵傳感器以其傳感單元體積小、感應(yīng)靈敏度高、不受電磁波干擾、易于多點(diǎn)監(jiān)測(cè)等特點(diǎn),在諸多傳感領(lǐng)域得到廣泛應(yīng)用,為人們帶來巨大的經(jīng)濟(jì)效益和更為安全便捷的生活方式。而錐形光纖Bragg光柵所具有的特性可以很好的解決溫度與應(yīng)力交叉敏感問題。本文通過建立數(shù)學(xué)模型,結(jié)合傳輸矩陣法,首先仿真研究線性錐面的錐形光纖Bragg光柵的軸向應(yīng)變與溫度的傳感特性。接著提出一種具有拋物線性錐面的非線性錐形光纖Bragg光柵,并且采用相同的光纖光柵參數(shù),將這兩種光柵進(jìn)行對(duì)比研究。結(jié)果表明,兩種錐形光纖光柵的反射帶寬只依賴于應(yīng)力大小而與溫度無關(guān),其中線性錐形光柵反射帶寬及中心波長(zhǎng)均與應(yīng)力大小成線性關(guān)系,而拋物線型的反射帶寬與應(yīng)力大小成非線性關(guān)系,但兩者的溫度傳感特性一致,說明改變光纖外部結(jié)構(gòu)形狀并不影響溫度靈敏度。最后,本文利用電弧放電技術(shù)制作錐形光纖光柵,研究其軸向應(yīng)力和溫度傳感特性,應(yīng)變靈敏度和溫度靈敏度分別為0.9468)/和0.0118nm/℃。光譜特性表明,在光柵反射譜峰中有透射峰出現(xiàn),透射峰中心波長(zhǎng)與反射譜兩側(cè)邊緣的距離大小不受溫度的影響,但隨著軸向應(yīng)力增大,透射峰中心波長(zhǎng)逐漸向反射譜長(zhǎng)波方向移動(dòng)。
[Abstract]:Fiber Bragg grating sensor has been widely used in many sensing fields because of its small size, high sensitivity, no interference by electromagnetic wave, easy multi-point monitoring and so on. For people to bring great economic benefits and a more safe and convenient way of life. The characteristics of tapered fiber Bragg gratings can solve the cross-sensitivity problem of temperature and stress. Based on the mathematical model and the transfer matrix method, the sensing characteristics of the axial strain and temperature of the conical fiber Bragg grating with linear conical surface are studied by simulation in this paper. Then a nonlinear tapered fiber Bragg grating with parabolic conical surface is proposed, and the two gratings are compared with each other with the same fiber grating parameters. The results show that the reflectance bandwidth of the two kinds of tapered fiber gratings is only dependent on the stress and is independent of the temperature. The reflection bandwidth and the center wavelength of the linear tapered gratings are linearly related to the magnitude of the stress. The parabolic reflectance bandwidth is nonlinear to the stress, but the temperature sensing characteristics of the two are consistent, indicating that the temperature sensitivity is not affected by changing the shape of the external structure of the fiber. Finally, the tapered fiber grating is fabricated by arc discharge technique. The axial stress and temperature sensing characteristics of the grating are studied. The strain sensitivity and temperature sensitivity are 0.9468 / and 0.0118nm/ 鈩，

本文編號(hào)：1809215