短週期光纖光柵在動態系統的量測與應用

The Applications on Dynamic Systems for Fiber Bragg Gratings

葉耀文(Yao-Wen Yeh)

指導教授 ： 馬剣清

國立臺灣大學/工學院/機械工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.02010

摘要

光纖光柵所製成的感測器有不受電磁干擾，高靈敏度以及多樣性的量測能力等各項優點，其在靜態以及低頻的量測能力已受到肯定，且已大量在各方面獲得實質的應用成果。而光纖光柵在量測動態反應的能力上仍需有進一步的研究成果才能做實際的應用。本論文旨在建立光纖光柵在靜態、穩態以及暫態的量測技術及量測能力並創建可行的動態量測系統。在本論文中亦將使用應變規、雷射都卜勒振動儀及壓電式感測器三種量測技術並與光纖光柵的量測結果做比較以確定研究成果的可行性與正確性。

本論文主要建立靜態以及穩態(振動)的量測能力並涵誧C頻(10Hz以下)，中頻(數十到數百Hz)以及高頻(數千Hz)的三個不同頻段，其輸出的施力頻率將由壓電材料來控制及激發，且包含了軸向，拉伸及彎曲變形等不同的質點運動模式，而應用光纖光柵來量測材料受動力衝撞時的暫態反應亦是本論文的研究重點。

關鍵字

動態反應 ； 光纖光柵 ； 感測器

並列摘要

Grating-based fiber sensors are simple and intrinsic and have all the advantages normally attributed to fiber sensors such as electromagnetic immunity, high sensitivity and multiplexing capabilities. Various applications in sensing static and low frequency response have been widely reported. However, some limitations, particularly in the capability of the sensing dynamic responses, may be needed for further investigations. The main objective of this thesis is to establish the experimental measuring system based on the grating-based fiber sensors to obtain the dynamic response of materials subjected to dynamic leadings. Another three measuring techniques, strain gage, laser Doppler vibrometer and NBS transducer, are also used in this study to verify the results obtained from grating-based fiber.

The frequencies of the applied loading are controlled by piezoelectric materials and are covered from low frequency (under 10Hz), middle frequency (101~102 Hz) and high frequency (~103Hz). The measurement of the transient response of the material subjected to dynamic impact loadings is also investigated in this study.

並列關鍵字

Grating-based fiber ； Sensors ； Dynamic response

參考文獻

Anderson, D. Z., Mizrahi, V., Erdogan, T., and White, A. E., (1993) "Production of in-Fiber Gratings Using a Diffractive Optical Element," Electronics Letters, 29(6), 566-568

Ball, G. A., and Morey, W. W., (1992) "Continuously Tunable Single-Mode Erbium Fiber Laser," Optics Letters, 17(6), 420-422

Ball, G. A., and Morey, W. W., (1992) "Compression Tuned Single Frequency Bragg Grating Fiber Laser," Optics Letters, 17(6), 420-422

Berthold, A., and Dändliker, R., (1988) "Determination of the Individual Strain-Optic Coefficients in Single-Mode Optical Fibers," Journal of Lightwave Technology, 6(1), 17-20

Chern, G. W., Wang, L. A., and Lin, C. Y., (2001) "Transfer-Matrix Approach Based on Modal Analysis for Modeling Corrugated Long-Period Fiber Gratings," Applied Optics, 40(25), 4476-4486