细直径极大倾角光纤光栅pH值传感器

发布时间：2018-03-03 02:10

  本文选题：pH　切入点：细直径极大倾角光纤光栅　出处：《半导体光电》2017年03期 　论文类型：期刊论文

【摘要】：为提高现有光纤pH值传感器的检测灵敏度和检测范围,降低弯曲以及温度交叉敏感的影响,提出以pH值敏感型智能水凝胶为敏感膜的细直径极大倾角光纤光栅(Thin Excessively Tilted Fiber Grating,Thin-Ex-TFG)pH值传感器。理论上分析了影响传感器灵敏度的因素,研究了提高传感器灵敏度的方案。然后,制作出不同封装厚度的Thin-Ex-TFG pH值传感器,进行实验研究。实验结果表明:Thin-Ex-TFG pH值传感器相比基于光纤Bragg光栅和长周期光纤光栅的pH值传感器,检测灵敏度(最大可达-0.704nm/pH)和响应范围(pH值2~7)均有提高;与标准直径极大倾角光纤光栅相比,其检测灵敏度也有所提升。此外,增加水凝胶涂覆厚度或减少光纤光栅包层直径均能有效地提高pH值检测的灵敏度,实验结果与理论分析吻合。
[Abstract]:In order to improve the detection sensitivity and detection range of the existing optical fiber pH sensor, and reduce the influence of bending and temperature cross-sensitivity, This paper presents a thin Excessively Tilted Fiber Gratingn Thin-Ex-TFGG pH sensor based on pH sensitive smart hydrogel. The factors affecting the sensitivity of the sensor are analyzed theoretically, and the scheme to improve the sensitivity of the sensor is studied. Thin-Ex-TFG pH sensor with different encapsulation thickness was fabricated and studied experimentally. The experimental results show that the pH sensor based on fiber Bragg grating and long-period fiber Bragg grating is different from the one based on Thin-Ex-TFG pH sensor. Both the detection sensitivity (up to -0.704 nm / s pH) and the response range (pH = 2 ~ 7) were improved, and the sensitivity was also improved compared with the standard diameter maximum inclination fiber grating. Increasing the thickness of hydrogel coating or reducing the diameter of fiber grating cladding can effectively improve the sensitivity of pH detection. The experimental results are in agreement with the theoretical analysis.
【作者单位】： 重庆理工大学光纤传感与光电检测重庆市重点实验室;重庆理工大学重庆市现代光电检测技术与仪器重点实验室;
【基金】：国家自然科学基金项目(51276209,61505017) 重庆市科委基础与前沿研究项目(cstc2014jcyjA0081) 重庆市教委科学技术研究项目(KJ1400942) 重庆理工大学研究生创新基金项目(YCX2015221)
【分类号】：TN253;TP212
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