本文選題：光纖傳感器　切入點(diǎn)：液體折射率檢測　出處：《山東科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：光纖傳感技術(shù),一般是通過各種增敏封裝結(jié)構(gòu)或光纖本身參數(shù)隨著外界物理量變化,而引起光纖中的光波參數(shù)變化,進(jìn)而感知和傳輸外界被測信號的一種傳感技術(shù)。光纖傳感器一經(jīng)產(chǎn)生就以其獨(dú)特的特性而得到廣泛應(yīng)用,尤其電絕緣性,化學(xué)穩(wěn)定性,耐腐蝕和抗干擾等。尤其在液體折射率檢測方面,光纖傳感器的靈敏度高,柔性韌性好,傳感器體積小,可以制成不同形狀,耐腐蝕和大量程的獨(dú)特優(yōu)勢更加顯著。隨著各行各業(yè)對于檢測技術(shù)的要求越來越高,對于液體折射率傳感器也提出了更高的要求。本論文針對全光纖結(jié)構(gòu)光纖液體折射率傳感器進(jìn)行研究,該類傳感器較現(xiàn)有的光纖光柵類折射率傳感器,具有更高的靈敏度,結(jié)構(gòu)簡單,成本低和易于實(shí)現(xiàn)等特點(diǎn)。然而,大量已有研究結(jié)果顯示,該類傳感器在低濃度液體折射率檢測方面還有待發(fā)展,因此,本論文以單模-小芯徑-單模(STS)光纖結(jié)構(gòu)構(gòu)成的全光纖Mach-Zehnder干涉儀式的光纖折射率傳感器為目標(biāo),對其折射率傳感特性進(jìn)行了研究,尤其對于該類傳感器在小折射率濃度下的靈敏度提高方面進(jìn)行了研究,并提出了增加靈敏度傳感器結(jié)構(gòu)方案,論文主要的研究工作如下:1、STS結(jié)構(gòu)傳感器的系統(tǒng)的理論和實(shí)驗(yàn)研究。在單模與小芯徑光纖的傳光原理基礎(chǔ)上,研究了傳感器輸出光譜與光纖參數(shù)關(guān)系。實(shí)驗(yàn)研究了該傳感器輸出譜干涉波長與液體折射率關(guān)系,實(shí)驗(yàn)獲得了不同波長(1541nm和1555nm)的條件下折射率與波長的關(guān)系曲線及傳感器靈敏度與波長關(guān)系。2、實(shí)驗(yàn)研究了彎曲增敏STS光纖結(jié)構(gòu)與折射率關(guān)系。獲得了不同光纖彎曲直徑(9.6cm, 8.3cm, 7.5cm)下傳感器干涉波長漂移與折射率變化關(guān)系曲線。分別測量了 1%-10%Nacl和1.335-1.4384溶液折射率與傳感器輸出干涉波長關(guān)系,可見,通過對敏感部分光纖彎曲,可以有效的提高傳感器折射率靈敏度,對于低濃度液體折射率檢測尤其有效。3、去部分包層STS光纖液體折射率傳感特性研究。實(shí)驗(yàn)中,通過去除敏感部分光纖部分包層方法也可以提高傳感器靈敏度,并對實(shí)驗(yàn)方法和過程進(jìn)行了詳細(xì)論述。實(shí)驗(yàn)結(jié)果表明,腐蝕后的STS全光纖折射率傳感器對小折射率具有很好的靈敏度。對于0-1%和1%-10%Nacl溶液折射率不同波長(1539.43nm和1545.5nm)具有不同的靈敏度,波長與折射率變化有較高的線性擬合度。
[Abstract]:The optical fiber sensing technology usually changes the optical wave parameters in the optical fiber by various sensitized packaging structures or the parameters of the fiber itself with the change of the external physical quantity. A sensing technique for sensing and transmitting external measured signals. Optical fiber sensors are widely used because of their unique characteristics, especially electrical insulation and chemical stability. Especially in liquid refractive index measurement, optical fiber sensors have high sensitivity, good flexibility and toughness, small size, and can be made into different shapes. The unique advantages of corrosion resistance and mass range are even more significant. In this thesis, the fiber optic fiber refractive index sensor with all-fiber structure is studied, which has higher sensitivity than the existing fiber Bragg grating refractive index sensor. The structure is simple, the cost is low and the realization is easy. However, a large number of research results show that this kind of sensors still need to be developed in low concentration liquid refractive index detection, so, In this paper, the refractive index sensor of all-fiber Mach-Zehnder interferometric ceremony is studied, which is composed of single-mode, small-core diameter and single-mode STS fiber structure. In particular, the sensitivity of this kind of sensors under the small refractive index concentration is studied, and the scheme of increasing sensitivity sensor structure is proposed. The main research work of this thesis is as follows: theoretical and experimental research on the system of the 1: 1 STS structure sensor. On the basis of the light transmission principle of single mode and small core diameter fiber, The relationship between the output spectrum of the sensor and the parameters of the optical fiber is studied, and the relationship between the interference wavelength of the output spectrum of the sensor and the refractive index of the liquid is experimentally studied. The relationship curves between refractive index and wavelength and sensitivity of sensor with wavelength of 1541nm and 1555nm were obtained experimentally. The relationship between structure and refractive index of bending sensitized STS fiber was studied experimentally, and the relationship between refractive index of different fiber bending was obtained. The relationship between the interference wavelength shift and the refractive index change of the sensor at the diameter of 9.6cm, 8.3cm, 7.5cm) has been measured, respectively. The relationship between the refractive index of 1-10Nacl and 1.335-1.4384 solution and the output interference wavelength of the sensor has been measured. It can be seen that the sensitivity of sensor refractive index can be improved effectively by bending the sensitive part of fiber, especially for low concentration liquid refractive index detection. The liquid refractive index sensing characteristics of partially clad STS fiber are studied. The sensitivity of the sensor can also be improved by removing the sensitive part of the fiber partial cladding, and the experimental method and process are discussed in detail. The experimental results show that, The corroded STS all-fiber refractive index sensor has good sensitivity for small refractive index, and has different sensitivity for 0-1% and 1% -10 NaCl solution refractive index at different wavelengths 1539.43 nm and 1545.5 nm.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN253;TP212

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