Construction and evaluation of a gold-deposited optical fiber sensor system for measurements of refractive indices of alcohols
Construction and evaluation of a gold-deposited optical fiber sensor system for measurements of refractive indices of alcohols
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DOI：
10.1016/j.sna.2003.11.029
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发表时间：
2004-03-15
影响因子：
4.6
通讯作者：
Higo, M
中科院分区：
文献类型：
--
作者：
Mitsushio, M;Higashi, S;Higo, M
一个金沉积的光纤传感器系统，利用表面等离子体共振（SPR）在金膜（45 nm）周围的无包层芯的构建和系统进行了评价，用于定量分析各种醇。可以测量到折射率（RI）单位为0.0001的微小变化。传感器系统的响应时间小于0.5分钟。在6%（v/v）以下的苯甲醇溶液的校准曲线中获得的直线的相关系数为0.997。传感器对折射率从1.33到1.54的宽范围的响应曲线分别在1.374和1.462 RI单位处具有宽而尖锐的最小值。由于SPR现象，前一个最小值随着膜变厚而向较低的极化活性移动。后者最小值的折射率活性非常接近光纤芯的折射率活性。沉积在玻璃上的金膜的表面形貌和具有不同厚度的膜的电阻的变化表明，最小值是由于光通过薄的沉积金膜中的缺陷泄漏到具有与芯相同的光活性的样品溶液。(C)2003 Elsevier B. V.保留所有权利。
A gold-deposited optical fiber sensor system using surface plasmon resonance (SPR) in a gold film (45 nm) around an unclad core was constructed and the system was evaluated for quantitative analyses of various alcohols. A small change of 0.0001 refractive index (RI) units in the refractivity can be measured. The response time of the sensor system is less than 0.5 min. The straight line with a correlation coefficient of 0.997 in the calibration curve for methanol solutions of benzyl alcohol was obtained below 6% (v/v). The response curve of the sensor to the wide range of refractive indices from 1.33 to 1.54 has a broad and sharp minimum at 1.374 and 1.462 RI units, respectively. The former minimum due to the SPR phenomenon shifts to a lower refractivity as the film becomes thicker. The refractivity of the latter minimum is very close to that of the core of the optical fiber. Surface morphologies of deposited gold films on glass and a variation in resistance of the films with various thicknesses show that the minimum is due to the leakage of light through defects in the thin deposited gold film to the sample solution with the same refractivity as that of the core. (C) 2003 Elsevier B.V. All rights reserved.