Multpoint temperature sensor employing LPFGs with refractive index structure optimaized in longitudinal direction

2016 Fiscal Year Final Research Report

• Project/Area Number: 25420336
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Electron device/Electronic equipment
• Research Institution: Osaka Prefecture University
• Principal Investigator: koyama osanori 大阪府立大学, 工学(系)研究科(研究院), 准教授 (10336802)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: LPFG / 長周期ファイバグレーティング / 多点温度センサ / CO2レーザ

Outline of Final Research Achievements

The purpose of this research is remote temperature sensing under long-term heating environment where humans have difficulty entering. A multipoint temperature sensor witch could sense high temperatures at multiple points remotely and simultaneously has been realized by cascading CO2-laser-induced LPFGs (Long Period Fiber Grating) in series. Furthermore, behaviors of the resonant wavelength and loss value at some loss peaks in a spectrum of the LPFG were investigated under high temperature environment for several hours. Quality keeping times of the LPFG as a high temperature sensor based on the behaviors were evaluated. Additionally, a new method, the double inscribing method using a CO2 laser, was proposed to make the loss spectrum of the LPFGs more suitable when constructing a multipoint temperature sensor using several the LPFGs. The relationship between grating pitch and parameters of the method was clarified to obtain suitable spectrum for the multipoint sensor

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