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  本文關(guān)鍵詞：長距離光纖折射率傳感技術(shù)研究　出處：《中國計量學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 折射率 長距離傳感 OTDR LPFG Sagnac干涉環(huán) 準(zhǔn)分布

【摘要】：長距離的實(shí)時監(jiān)測在一些應(yīng)用領(lǐng)域中具有非常重要的作用,比如化工產(chǎn)業(yè),海洋環(huán)境評估和管道安全監(jiān)測等領(lǐng)域。折射率參數(shù)作為物質(zhì)的內(nèi)在屬性,與物質(zhì)的化學(xué)、物理性質(zhì)之間有著非常密切的聯(lián)系。所以在一些的應(yīng)用領(lǐng)域中,對折射率進(jìn)行長距離的實(shí)時性檢測具有非常重要的實(shí)際意義。本論文主要研究內(nèi)容為長距離的折射率傳感技術(shù),具體研究內(nèi)容如下:1、基于光時域反射技術(shù)提出了一種反射型的長距離折射率傳感器。該傳感器通過測量光纖端面與樣品溶液之間的菲涅爾反射信號,能夠輕易地獲得一定距離以外的折射率變化信息。該傳感器具有制作簡單、操作方便等優(yōu)點(diǎn)。實(shí)驗(yàn)結(jié)果表明了該傳感器能夠?qū)崿F(xiàn)的測量距離可達(dá)100.8km,在折射率范圍1.3486~1.4525,折射率的靈敏度范圍為38.71 d B/RIU~304.89 d B/RIU。實(shí)驗(yàn)還通過人為的施加干擾驗(yàn)證了該傳感器具有較好的穩(wěn)定性和準(zhǔn)確性,在長距離的折射率傳感領(lǐng)域中具有較好的應(yīng)用前景。2、提出并實(shí)現(xiàn)了一種基于菲涅爾反射的準(zhǔn)分布折射率傳感器。利用光耦合器從光纖鏈路上分出的光纖末梢切平后被作為折射率傳感頭。在多個折射率傳感頭之間采用不同長度的延遲光纖,利用不同位置傳感處的菲涅爾反射信號回到測量端的時間差來實(shí)現(xiàn)距離可分辨的多點(diǎn)測量。我們通過實(shí)驗(yàn)實(shí)現(xiàn)了測量距離為16公里雙點(diǎn)折射率傳感,并表明了該傳感器在折射率范圍1.3486~1.4525,其對應(yīng)的靈敏度范圍為38.785d B/RIU~305.430d B/RIU。實(shí)驗(yàn)還通過增加傳感頭的數(shù)量進(jìn)一步驗(yàn)證了該傳感器的多點(diǎn)復(fù)用能力。3、提出了一種基于反射型長周期光纖光柵(Long Period Fiber Grating,LPFG)的長距離雙參數(shù)傳感技術(shù),該傳感技術(shù)通過連接LPFG和Sagnac干涉環(huán)實(shí)現(xiàn)了折射率與溫度的同時監(jiān)測。在一個傳統(tǒng)的LPFG末端連接一個Sagnac干涉環(huán),是LPFG工作在反射模式,這種結(jié)構(gòu)更適合一些長距離傳感。因?yàn)長PFG與Sagnac具有不同的溫度和折射率靈敏度,所以可以通過監(jiān)測LPFG的諧振峰和Sagnac干涉峰的波長移動來同時獲得溫度和折射率值。實(shí)驗(yàn)結(jié)果表明,該傳感器的溫度靈敏度為1.533nm/°C,在折射率范圍1.333~1.430,折射率靈敏度為16.864nm/RIU~113.142nm/RIU。實(shí)驗(yàn)利用該傳感器實(shí)現(xiàn)了的40km折射率和溫度的同時傳感,證明了該傳感器在長距離的雙參數(shù)傳感領(lǐng)域中具有良好的應(yīng)用前景。
[Abstract]:Long-distance real-time monitoring plays an important role in some applications, such as chemical industry, marine environmental assessment and pipeline safety monitoring. Refractive index parameters are the intrinsic properties of materials. There is a very close relationship with the chemical and physical properties of substances. So in some fields of application. It is very important to detect the refractive index in real time with long distance. The main content of this thesis is the refractive index sensing technology of long distance. The specific research contents are as follows: 1. Based on the optical time domain reflectance technique, a reflective long distance refractive index sensor is proposed, which measures the Fresnel reflection signal between the optical fiber end surface and the sample solution. The information of refractive index change beyond a certain distance can be easily obtained.; the sensor has simple fabrication. The experimental results show that the measuring distance of the sensor can reach 100.8km, and the refractive index is 1.3486n 1.4525. The sensitivity range of refractive index is 38.71 dB / RIUN 304.89 d. B / RIU. experiments also verify the stability and accuracy of the sensor by artificial interference. It has a good application prospect in the field of long-range refractive index sensing. A quasi-distributed refractive index sensor based on Fresnel reflectance is proposed and realized. The optical fiber tip which is separated from the fiber link by optical coupler is used as the refractive index sensor head. With different lengths of delay fiber. Using the time difference of Fresnel reflection signal at different positions to get back to the measuring end to realize the range resolution multipoint measurement, we have realized the measurement distance of 16 km double point refractive index sensor. It is shown that the sensor is in the refractive index range of 1.3486U 1.4525. The corresponding sensitivity range is 38.785d, B / R, 305.430d. By increasing the number of sensor heads, the experiment further verifies the multipoint multiplexing capability of the sensor. 3. A long distance two-parameter sensing technique based on long Period Fiber grating (LPFG) is proposed. The sensing technique realizes the simultaneous monitoring of refractive index and temperature by connecting the LPFG and Sagnac interference rings. A Sagnac interference ring is connected at the end of a traditional LPFG. LPFG works in reflection mode, and this structure is more suitable for some long-range sensing because LPFG and Sagnac have different temperature and refractive index sensitivity. Therefore, the temperature and refractive index can be obtained simultaneously by monitoring the wavelength shift of the resonant peak of LPFG and the wavelength shift of the interference peak of Sagnac. The temperature sensitivity of the sensor is 1.533 nm / 擄C, and the refractive index is 1.333 nm / 擄C. The refractive index sensitivity is 16.864 nm / r IUN 113.142nm / r RIU. The 40 km refractive index and temperature sensor is used in the experiment. It is proved that the sensor has a good application prospect in the field of long distance two-parameter sensor.
【學(xué)位授予單位】：中國計量學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN253

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