Potential-Scanning Sensing for Refractive Index Using an Indium Tin Oxide (ITO)-Coated Long-Period Fiber Grating (LPFG)
Potential-Scanning Sensing for Refractive Index Using an Indium Tin Oxide (ITO)-Coated Long-Period Fiber Grating (LPFG)
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DOI：
10.1080/00032719.2021.1951749
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发表时间：
2021-07
影响因子：
2
通讯作者：
Takuya Okazaki;Tatsuya Orii;Shin-Yinn Tan;Tomoaki Watanabe;A. Taguchi;F. Rahman;H. Kuramitz
中科院分区：
文献类型：
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作者：
Takuya Okazaki;Tatsuya Orii;Shin-Yinn Tan;Tomoaki Watanabe;A. Taguchi;F. Rahman;H. Kuramitz
提出了一种利用氧化铟锡涂层的长周期光纤光栅（LPFG）进行折射率检测的电位扫描传感技术。LPFG采用电弧感应技术制备。传感是通过电位扫描控制ITO电极的电子密度来实现的。通过施加电势，LPFG在透射光谱中的衰减峰发生了移位。因此，在电位扫描过程中得到具有衰减峰的透射-电位谱，通过衰减峰电位可以确定传感器附近的折射率。ITO-LPFG成功地在0% ~ 33%浓度蔗糖溶液中进行了电位扫描折射率检测实验。该方法的传感器分辨率为0.0063 ΔRI，灵敏度为9.9 V/RIU。这些值是改善使用波长，实验表明，提供高灵敏度和折射率线性。在1136 nm处，最小传感器分辨率为0.0017 ΔRI，最大灵敏度为26.7 V/RIU。在这项工作中，由峰电位确定的测量结果不受单个样品初始光强变化的影响。此外，该传感方法可用于近红外区域，具有实时和远程监测的能力。
Abstract Here is presented a potential-scanning sensing technique for refractive index detection using a long-period fiber grating (LPFG) coated with indium tin oxide (ITO). The LPFG was produced by an electric arc-induced technique. The sensing is achieved by controlling the electron density of the ITO electrode by potential scanning. The attenuation peak of the LPFG in the transmittance spectra is shifted by the application of a potential. Therefore, a transmittance–potential spectrum with an attenuation peak is obtained during potential scanning, and the refractive index near the sensor can be determined from the peak potential at attenuation. The ITO-LPFG was successfully employed to experimentally perform potential-scanning for refractive index detection in sucrose solutions with concentrations between 0% and 33%. A sensor resolution of 0.0063 ΔRI and a sensitivity of 9.9 V/RIU were obtained using this approach. These values were improved using wavelengths that were experimentally shown to provide high sensitivity and refractive index linearity. A minimum sensor resolution of 0.0017 ΔRI and a maximum sensitivity of 26.7 V/RIU were obtained at 1136 nm. The measurements determined from the peak potential in this work were unaffected by variations in the initial light intensity for individual samples. In addition, this sensing approach can be employed in the near-infrared region and is capable of real-time and remote monitoring.