Analysis of Polyimide-Coated Optical Fiber Long-Period Grating-Based Relative Humidity Sensor
Analysis of Polyimide-Coated Optical Fiber Long-Period Grating-Based Relative Humidity Sensor
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DOI：
10.1109/jsen.2012.2227714
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发表时间：
2013-02-01
影响因子：
4.3
通讯作者：
Grattan, Kenneth V.
中科院分区：
文献类型：
--
作者：
Alwis, Lourdes;Sun, Tong;Grattan, Kenneth V.
设计了一种基于长周期光栅（LPG）的相对湿度（RH）传感器，该传感器在光纤探头远端光栅区域使用定制的层状聚酰亚胺涂层，使其能够响应湿度变化。传感器所基于的涂层LPG的衰减带通过LPG的特征波长的变化来响应变化的RH（在这种情况下，在20%到80% RH的范围内）。实验结果证实，所创建的传感器对RH水平的变化表现出线性响应。该传感器的灵敏度估计为0.10 nm/% RH，迟滞可以忽略不计(
A long-period grating (LPG)-based relative humidity (RH) sensor is developed, based on using a tailored layered polyimide coating on the grating region at the distal end of the fiber probe and allowing it to respond to humidity changes. The attenuation band of the coated LPG, on which the sensor is based, responds to the varying RH (in this case, over the region from 20% to 80% RH) through changes in the characteristic wavelength of the LPG. The experimental results confirm that the sensor created shows a linear response to the variation of RH levels. The sensitivity of the sensor is estimated to be 0.10 nm/% RH with negligible hysteresis (