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Title: | 應用布拉格光纖光柵感測器於壓電陶瓷雙晶片之動態特性量測與積層製造之埋入式感測 Application of Fiber Bragg Grating Sensors in the Measurement of Dynamic Characteristics of Piezoceramic Bimorphs and Embedded Sensing in Additive Manufacturing |
Authors: | 蔡任航 Jen-Hang Tsai |
Advisor: | 馬劍清 Chien-Ching Ma |
Keyword: | 布拉格光纖光柵,能量調變法,壓電陶瓷雙晶片,暫態波傳,積層製造,熱膨脹係數,拉伸實驗,應變規, Fiber Bragg Grating,power modulated method,piezoeceramic bimorphs,transient response,additive manufacturing,coefficient of thermal expansion,strain gage,tensile testing, |
Publication Year : | 2023 |
Degree: | 碩士 |
Abstract: | 光纖由於其具有優異的傳輸特性與幾何形狀特性、高靈敏度且不受電磁波影響之特性,近年來在感測技術的研發蓬勃發展,其中尤其以布拉格光纖光柵(Fiber Bragg Grating, FBG)感測器發展最為迅速,其在準靜態時可以搭配波長解調器進行定量的量測,而在動態訊號上亦可使用能量調變型系統作為訊號之擷取方法,同時還能使用多光纖光柵一次對多點進行監測,而本實驗室過去已對上述方法投入許多研究,具有相當成熟之技術。
本文以光纖光柵應用於暫態波傳及熱學量測為主要方法,首先對壓電陶瓷雙晶片進行暫態波傳之量測,分別使用高速波長解調器以及能量調變型系統對低頻以及高頻之訊號做量測,再對壓電陶瓷雙晶片因振動產生溫升的情況進行熱學量測;接著將光纖光柵埋入3D列印之試片,量測列印過程中溫度以及應變的變化,分析列印方向對於試片之影響;最後使用光纖光柵量測鋁板受到拉伸對於其共振頻率的影響,並計算出共振頻率與拉力值之曲線擬合方程式,對試片施加不同拉力並反算出拉力值,以驗證曲線擬合方程式對於試片拉伸力量預測之正確性。 Fiber optics has seen remarkable advancements in sensing technology in recent years due to its excellent transmission and geometric properties, high sensitivity, and immunity to electromagnetic interference. Among these advancements, Fiber Bragg Grating (FBG) sensors have experienced rapid development. FBG can be integrated with the I-MON system to monitor quasi-static situation. It may also be utilized to measure the transient response of solid structures by applying the power modulating method. Additionally, multiple FBG can be employed simultaneously for multi-point monitoring. Our lab has invested considerable research effort into these methods and possesses mature technology in this area. In this study, the FBG sensor is mainly used to measure transient response and thermal characteristics. Firstly, we conducted transient wave propagation measurements on piezoeceramic bimorphs. The low frequency signal high-speed I-MON and the high frequency signal were measured using power modulating method. Subsequently, thermometry measurements were performed on the piezoeceramic bimorphs to study the temperature rise due to vibration. Then, we embedded FBG into 3D-printed specimens to measure temperature and strain variations during the printing process. Then analyzes the impact of printing direction on the specimens . Finally, we used FBG to measure the effect of tensile force on the resonant frequency of an aluminum plate. We derived a fitting equation correlating the resonant frequency with the applied tension and used it to predict the tension values for different specimens. This approach was employed to verify the accuracy of the predictive capacity of the fitting equation for tension force estimation in the specimens. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/89925 |
DOI: | 10.6342/NTU202303994 |
Fulltext Rights: | 同意授權(全球公開) |
Appears in Collections: | 機械工程學系 |
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ntu-111-2.pdf | 24.32 MB | Adobe PDF | View/Open |
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