Zhong Nianbing, Zhu Xun, Liao Qiang, Wang Yongzhong, Chen Rong, Sun Yahui
Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing, China.
Appl Opt. 2013 Jun 10;52(17):3937-45. doi: 10.1364/AO.52.003937.
The effects of surface roughness on the light transmission properties and sensitivity of fiber-optic evanescent wave sensors are investigated. A simple method of increasing the sensitivity based on the surface roughness (pit depth δ and diameter Δ) and incident angle U(i) of light rays on the fiber input end is proposed. We discovered that as 2δ/Δ increases, the transmitted light intensity decreases, but the sensitivity initially increases and then decreases. In sensors containing fibers of various roughnesses, the sensitivity to glucose solutions reached -11.7 mW/riu at 2δ/Δ=0.32 and increased further to -15.3 mW/riu with proper adjustment of U(i).
研究了表面粗糙度对光纤倏逝波传感器的光传输特性和灵敏度的影响。提出了一种基于表面粗糙度（凹坑深度δ和直径Δ）以及光线在光纤输入端的入射角U(i)来提高灵敏度的简单方法。我们发现，随着2δ/Δ增大，透射光强度降低，但灵敏度起初增大，随后减小。在包含不同粗糙度光纤的传感器中，对于葡萄糖溶液的灵敏度在2δ/Δ = 0.32时达到-11.7 mW/riu，并且通过适当调整U(i)可进一步增至-15.3 mW/riu。
