A High Sensitivity Concentration Sensing Demodulation Technique

Hongxia, 赵洪霞 Zhao; Zhiqun, 丁志群 Ding; Jinxia, 王金霞 Wang; Xiaohui, 方晓惠 Fang; Hui, 贾辉 Jia; Jilong, 鲍吉龙 Bao

doi:10.3788/cjl20103705.1294

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“…So an efficient and low-cost approach to interrogate LPFG sensing signal is earnestly needed to satisfy the request of the practical LPFG application. Several techniques could been considered to interrogate the LPFG sensing signal, such as Fabry-Perot (F-P) filter method and the intensity interrogation method based on change of optical intensity [4][5][6][7]. However these techniques have their disadvantage, such as the high cost and complicated fabrication of F-P filter, bad resolution of intensity interrogation method.…”

Section: Introductionmentioning

confidence: 99%

Signal Demodulation of High-Temperature LPFG Strain Sensor Based on Arrayed Waveguide Grating

Zhang

Liu

2014

AMM

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Among all the kinds of optical fiber sensors, FBG and LPFG become the main current owing to its features and advantages. LPFG sensor is especially suitable in high temperature sensing and stimulates more related research interests. The key point of LPFG sensing is the signal demodulation and processing. In this paper, signal demodulation of the LPFG strain sensor was studied based on Arrayed Waveguide Grating. The fabrication method and high temperature performance of this sensor were presented,and a novel strain signal demodulation method was presented based on Arrayed Waveguide Grating (AWG) device by equi-intensity cantilever beam. The experimental results demonstrated that the signal demodulation technology based on AWG has many advantages, such as simple structure, innovative and reliable performance.

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Section: Introductionmentioning

confidence: 99%