Optical Relative Humidity Sensing Based on Oscillating Wave-Enhanced Goos–Hänchen Shift

Optical Relative Humidity Sensing Based on Oscillating Wave-Enhanced Goos–Hänchen Shift
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基于振荡波增强古斯汉兴位移的光学相对湿度传感

DOI:
10.1109/lpt.2015.2494601
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发表时间:
2016-02
期刊:
IEEE Photonics Technology Letters,
影响因子:
--
通讯作者:
Haimei Luo
Haimei Luo
中科院分区:
其他
文献类型:
--
作者:
Xianping Wang;Minghuang Sang;Wen Yuan;Yiyou Nie;Haimei Luo

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利用一种增强的GOOS-Hänchen(GH)漂移来监测相对湿度(RH)。聚酰亚胺与水分子的相互作用可以改变波导的结构参数(厚度和折射率),从而改变GH位移的大小。在我们的实验中,测量了相对湿度从43%到73%以5%的步长变化以及相应的干燥过程中生长激素移位的幅度。提出的光学RH传感器具有良好的线性度和高灵敏度,同时响应时间短,具有良好的长周期稳定性。此外,由于GH移位信号是位置编码的,因此我们的传感机制不受光源强度波动的影响。
An enhanced Goos-Hänchen (GH) shift, which is attributed to the oscillating wave propagating in the polyimide-coated symmetrical metal cladding waveguide, is employed to optically monitor the relative humidity (RH). The interaction of polyimide with the water molecules can change the waveguide structure parameters (thickness and refractive index) and thus alter the magnitude of GH shift. In our experiment, the magnitude of GH shift is measured during the RH variation from 43% to 73% with a step of 5% and the corresponding desiccation process. The proposed optical RH sensor exhibits good linearity and high sensitivity, meanwhile provides short response time and favorable stability over a long period. In addition, since the GH shift signal is position encoded, our sensing mechanism is immune to the intensity fluctuation in the light source.
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