內埋式光纖光柵感測聚碳酸酯之動態行為

The investigation of the dynamic behavior in polycarbonate by embedded fiber Bragg grating sensor

許仕坤(Shih-Kun Hsu)

指導教授 ： 單秋成

國立臺灣大學/工學院/機械工程學研究所/碩士(2006年)

https://doi.org/10.6342/NTU.2006.01324

摘要

光纖光柵的應變感測特性可以透過貼附的方式，量測其載體的應變特性。本實驗將光纖光柵於塑膠射出成型的澆注製程時，直接將光纖光柵埋到產品中。透過這樣的埋入方式，可以提高光纖光柵的量測範圍和壽命。研究其靜態與動態感測的特性，期許這樣的感測系統能應用在關鍵的塑膠元件的即時監測與損壞預防上。
本實驗從射出成型開始，克服異質埋入所導致的產品缺陷(如氣泡)，直到足夠的良率進行光纖光柵的埋入。隨後，對於有/無埋入光纖的產品，比較其拉伸強度與疲勞壽命的差異。其中，觀察破斷面型態與光柵的波長飄移，可以瞭解產品內部的殘留應力與破斷面分析。最後，試驗這樣的感測系統其靜態與動態的感測特性，並用以監測產品的模數衰減圖，討論此系統相較其他應變感測系統的優劣性。

關鍵字

光纖光柵 ； 塑膠射出成型 ； 應變感測系統

並列摘要

By sticking onto the surface, Fiber Bragg gratings (FBGs) measure the straining property of substrate. The research is to apply FBGs to the injection molding by imbedding it right into the injection process. By using this method, we can increase the range and the fatigue life of FBGs. This research investigates the static and dynamics properties of the sensing system in hope that such system can be applied to the practical field of monitoring and damage prevention of the critical plastic components in national defense, medical, and aerospace.
Beginning from injection molding, some challenges faced in the experiments, like bubbles arisen from the imbedding of FBGs, were overcame until the result of imbedding process was good enough. Then, the tensile strength and fatigue life of specimens with FBGs imbedded and without were compared. Finally, we examined the capability of FBG strain sensing system in both static and dynamic condition, monitored the stiffness-N curve of specimen, and discussed the advantage and disadvantages of other strain sensing system.

並列關鍵字

fiber Bragg grating ； injection molding ； strain sensing system

參考文獻

[2] Alan D. Kersey, “A review of recent developments in fiber optic sensor

technology”, Optic. Fiber Technol, vol. 2, pp. 291-317, 1996.

[3] K. O. Hill and G. Meltz, “Fiber Bragg grating technology fundamental and

[4] Raman Kashyap，”Fiber Bragg Gratings”, Academic Press, New York, pp.

optical fiber waveguides: Application to reflection filter fabrication”, Appl. Phys.