【摘要】：論文對具有廣泛應用前景的分布式偏振串擾保偏光纖溫度與應變傳感技術進行了探索研究,主要圍繞保偏光纖串擾延遲差與環(huán)境溫度數(shù)學關系推導、保偏光纖溫度傳感系數(shù)(TSC)測量、分布式溫度傳感系統(tǒng)設計及可行性驗證、保偏光纖串擾強度與橫向壓力數(shù)學關系推導、軸向應變測量傳感基帶設計、分布式軸向應變傳感系統(tǒng)設計及可行性驗證等方面展開研究,主要內(nèi)容和創(chuàng)新點如下:1.對基于偏振串擾分析的分布式光纖溫度傳感與應變傳感進行了理論研究,推導了保偏光纖串擾延遲差與環(huán)境溫度數(shù)學關系式、串擾強度與橫向壓力數(shù)學關系式,并做了模擬分析,得知在一定范圍內(nèi),應力隨串擾量的變化具有近線性的關系;2.通過在保偏光纖上沿軸向不同間隔制造預設串擾峰的方式,實驗得到了商用光纖(YOFC PANDA_PM1550_125-18/250)平均的TSC為-0.7μm/(°C?m),且設計了兩種分布式溫度測量方案,首次驗證了基于偏振串擾分析的分布式光纖溫度傳感的可行性,在不考慮儀器機械誤差情況下,系統(tǒng)的測量空間分辨率為1.42m、溫度分辨率為1.42℃。3.設計了一種新穎的保偏光纖金屬基帶制作方案,可把光纖所受的軸向應變有效轉換為橫向壓力進行測量,且搭建了一套簡單的應變測量系統(tǒng),實現(xiàn)了5m光纖長度0~160.888με的高精度分布式應變測量,首次驗證了通過布置預設串擾峰的方式實現(xiàn)分布式光纖應變傳感的可行性,且系統(tǒng)的空間分辨率可達10cm。
[Abstract]:In this paper, the distributed polarization crosstalk polarization maintaining fiber temperature and strain sensing technology, which has wide application prospect, is studied, and the mathematical relationship between the polarization maintaining fiber crosstalk delay difference and the ambient temperature is derived. (TSC) measurement of temperature sensing coefficient of polarization-maintaining fiber, design and feasibility verification of distributed temperature sensing system, derivation of mathematical relationship between crosstalk intensity and transverse pressure of polarization maintaining fiber, design of sensing baseband for axial strain measurement, The design and feasibility verification of distributed axial strain sensing system are studied. The main contents and innovations are as follows: 1. The distributed optical fiber temperature sensor and strain sensor based on polarization crosstalk analysis are studied theoretically. The mathematical relations between the difference of polarization maintaining fiber crosstalk delay and ambient temperature and the relationship between crosstalk intensity and transverse pressure are derived. The simulation results show that the variation of stress with crosstalk is nearly linear within a certain range. By making preset crosstalk peaks at different axial intervals on polarization-maintaining fibers, the average TSC of commercial optical fiber (YOFC PANDA_PM1550_125-18/250) is -0.7 渭 m / (擄C ~ m), and two distributed temperature measurement schemes are designed. The feasibility of distributed optical fiber temperature sensor based on polarization crosstalk analysis is verified for the first time. The spatial resolution and temperature resolution of the system are 1.42 鈩，

本文編號：2245966