光纖感測掃描設備及光纖感測掃描方法 FIBER SIGNAL SCANNING DEVICE AND FIBER SIGNAL SCANNING METHOD

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

104117821

專利證號

I 577975

專利獲證名稱

光纖感測掃描設備及光纖感測掃描方法 FIBER SIGNAL SCANNING DEVICE AND FIBER SIGNAL SCANNING METHOD

專利所屬機關 (申請機關)

國立成功大學

獲證日期

2017/04/11

技術說明

本研究提出一種應用於光纖感測掃描儀的實時校正方法，使用法布里-珀羅干涉儀與四根無溫度效應式光纖光柵當作參考來掃描光纖布拉格光柵感測器的波長，設計新型光纖感測掃描儀並將其製作成模組化系統。由於光纖感測掃描儀中的法布里-珀羅干涉儀會被溫度所影響，應用四根無溫度效應式光纖光柵可校正其因溫度變化而飄移的掃描區間，將布拉格光柵感測器的波長定位。利用四根無溫度效應式光纖光柵的已知波長與掃描電壓可即時擬合出三階非線性曲線，此校正方法可克服法布里-珀羅干涉儀中PZT的非線性與非重複性之問題。使用LabVIEW發展相對應之軟體，進行實時演算與校正。實驗結果顯示此校正方法掃描出的波長精度約7.2pm，說明此新型光纖感測掃描儀可有效降低成本並改善精度。 A real-time calibration method in optical fiber sensing interrogator is proposed. This technique utilizes four A-thermal FBGs as references and Fabry-Perot scanner to scan the wavelengths of FBG sensors. A new optical sensing interrogator is designed and made as a module. Because the Fabry-Perot scanner in an interrogator will be affected by the temperature. Using four A-thermal FBGs can calibrate the temperature drift and locate the wavelengths of FBG sensors correctly. Four sets of data of A-thermal FBGs which included the known wavelengths and scanned voltages can fit a three order nonlinear curve immediately. This calibration method also overcomes the problems caused by non-linearity and non-repeatability of PZT in a Fabry-Perot scanner. The software is developed in LabVIEW with the calibration method. The result of experiments shows that the accuracy of wavelengths is 7.2pm. The new interrogator can decrease the budget and improve the accuracy effectively.

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