基于薄芯光纤模式干涉的氨传感器制备与传感特性研究
发布时间：2019-04-11 15:37
【摘要】：由于体积小,可抗电磁干扰,高灵敏性与稳定性等优势,光纤传感器得到广泛关注,应用于临床诊断、环境保护和食品安全等各个领域。本文设计并研制了一种基于薄芯光纤模式干涉的氨传感器。将一段薄芯光纤嵌入标准单模光纤中,并在薄芯光纤表面利用层层(Lb L)自组装技术进行敏感薄膜的涂覆。传感过程基于敏感薄膜对氨的选择性吸附,从而导致敏感薄膜折射率和输出干涉光谱发生改变,通过对中心波长移动量的分析来对氨实现传感检测。本文主要研究工作如下:(1)利用Beam PROP软件,对薄芯光纤传感器进行模型的构建。通过仿真获得了不同长度的传感器透射谱。考虑成本以及便于操作等问题,后期的模拟以及实验全部采取2cm薄芯光纤进行传感器的构建。模拟该传感器的折射率灵敏性,再与实验进行对比验证。结果皆显示随着外界折射率的逐渐增大,透射谱的中心波长逐渐发生红移,呈线性递增。对薄芯光纤模式干涉仪型传感器进行温度灵敏性的测试,温度灵敏性只有17.47pm/℃。结果说明该传感器抗温度干扰能力强,是理想的折射率传感器。(2)采用层层静电自组装技术在基底上制备了(PAH/PAA)和[(PVPMC+PAH)/PAA]无孔薄膜。扫描电镜结果显示PAH/PAA双分子层厚度为40nm,(PVPMC+PAH)/PAA双分子层厚度为46nm。在氯化钠溶液中对[(PVPMC+PAH)/PAA]薄膜进行处理,将PVPMC从三组分体系中去除,可形成大小为20-40nm的纳米孔洞。(PAH:聚丙烯胺盐酸;PAA:聚丙烯酸;PVPMC:羧酸类聚甜菜碱)(3)将(PAH/PAA)薄膜组装至薄芯光纤的外表面,在不同浓度的氨溶液中进行传感实验。随着浓度的逐渐增加,透射谱中心波长向短波长方向线性移动,移动量为6.87nm,传感器的灵敏性为0.027nm/ppm。传感器在选择性实验中表现出对氨良好的选择性,并且恢复性良好,动力学响应时间约为160s,恢复时间约为200s。利用折射率仪对不同氨浓度下(PAH/PAA)薄膜的折射率变化进行监测,结果显示随氨浓度增加,折射率总共减小0.006625,理论折射率灵敏性为850nm/R.I.U.。将(PAH/PAA)多孔薄膜组装至薄芯光纤的外表面,响应时间由160s缩短至70s,恢复时间也由200s缩短至80s。(4)敏感薄膜(PAH/PAA)+[PAH/(PAA+SWCNTs-COOH)]组装至薄芯光纤表面制作氨气传感器,在不同浓度的氨气中进行传感实验。随着氨气浓度逐渐增加,透射谱的中心波长向短波长方向移动,在氨浓度1-20ppm之间,呈线性移动。氨气浓度范围1-20ppm时,传感器的灵敏性为0.031nm/ppm。传感器在选择性实验中表现出对氨良好的选择性,并且恢复性良好,动力学响应时间约为30s,恢复时间约为75s。(SWCNTs-COOH:羧酸修饰的单臂碳纳米管)
[Abstract]:Due to its advantages of small size, resistance to electromagnetic interference, high sensitivity and stability, optical fiber sensors have been widely concerned and applied in many fields such as clinical diagnosis, environmental protection and food safety. In this paper, a kind of ammonia sensor based on thin core fiber optic mode interference is designed and developed. A section of thin core fiber is embedded in standard single mode fiber, and the sensitive film is coated on the surface of thin core fiber by layer-by-layer (Lb L) self-assembly technology. The sensing process is based on the selective adsorption of ammonia by the sensitive film, which results in the change of refractive index and output interference spectrum of the sensitive film. Through the analysis of the shift of the central wavelength, the sensing detection of ammonia is realized. The main research work in this paper is as follows: (1) the model of thin-core optical fiber sensor is constructed by using Beam PROP software. The transmission spectra of sensors with different lengths are obtained by simulation. Considering the cost and ease of operation, the 2cm thin-core optical fiber sensor is adopted in the later simulation and experiment. The refractive index sensitivity of the sensor is simulated and compared with the experiment. The results show that with the increase of external refractive index, the center wavelength of transmission spectrum is redshifted gradually, and it increases linearly. The temperature sensitivity of thin core fiber optic interferometer sensor is only 17.47pm/ 鈩，
本文编号：2456537
[Abstract]:Due to its advantages of small size, resistance to electromagnetic interference, high sensitivity and stability, optical fiber sensors have been widely concerned and applied in many fields such as clinical diagnosis, environmental protection and food safety. In this paper, a kind of ammonia sensor based on thin core fiber optic mode interference is designed and developed. A section of thin core fiber is embedded in standard single mode fiber, and the sensitive film is coated on the surface of thin core fiber by layer-by-layer (Lb L) self-assembly technology. The sensing process is based on the selective adsorption of ammonia by the sensitive film, which results in the change of refractive index and output interference spectrum of the sensitive film. Through the analysis of the shift of the central wavelength, the sensing detection of ammonia is realized. The main research work in this paper is as follows: (1) the model of thin-core optical fiber sensor is constructed by using Beam PROP software. The transmission spectra of sensors with different lengths are obtained by simulation. Considering the cost and ease of operation, the 2cm thin-core optical fiber sensor is adopted in the later simulation and experiment. The refractive index sensitivity of the sensor is simulated and compared with the experiment. The results show that with the increase of external refractive index, the center wavelength of transmission spectrum is redshifted gradually, and it increases linearly. The temperature sensitivity of thin core fiber optic interferometer sensor is only 17.47pm/ 鈩，
本文编号：2456537
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