臺灣博碩士論文加值系統

光纖布拉格光柵 (FBG) 振動傳感器是一種利用光纖技術原理測量加速度的傳感設備。 FBG 是嵌入在光纖芯中的周期性折射率變化。 由於這些光柵對各種物理參數（如應變、溫度和壓力）非常敏感，因此可以用作傳感器。 FBG 通常與質量或機械結構相連，將加速度轉化為應變，從而影響光柵。 當光柵受到應變時，布拉格波長會發生變化。 這種偏移可以通過監測光纖布拉格光柵的反射光譜來檢測。 FBG 加速度傳感器的主要優點包括抗電磁干擾、體積小、重量輕、多路復用能力和長期穩定性。 它們通常用於各種應用，例如結構健康監測、振動檢測和地震傳感。
為了保證光纖光柵振動傳感器具有較大的諧振頻率、較好的靈敏度、自溫度補償和後期的抗干擾能力，我們圍繞兩個主要內容對光纖光柵傳感器進行了設計和優化。 首先，加速度計的靈敏度增強用於中低頻測量。 第二部分，FBG加速度計的中高頻靈敏度增強。 主要思想著重針對FBG傳感器進行設計和優化，包括V型梁雙質量塊結構和圓形撓性鉸鏈結構。關鍵詞：FBG加速度傳感器，雙質量塊，一維加速度傳感器，二維振動傳感器，光纖布拉格光柵，V型雙質量塊，圓形撓性鉸鏈，低頻和中頻，中頻和高頻，振動測量。
理論研究證實了實驗結果，MATLAB® 軟件優化了 FBG 傳感器的諧振頻率、靈敏度和傳感器尺寸。 同時，使用 ANSYS® 軟件進行靜態結構應力和模態仿真分析，以驗證優化結果的可行性。 通過實驗測試評估傳感器的性能。 結果表明，加速度計顯示出出色的動態性能，使其成為振動測量的理想選擇。 這些研究表明，柔性鉸鍊和梁結構有望製造出尺寸緊湊、頻率高的 FBG 加速度傳感器，滿足機械設備的測量需求。

A fiber Bragg grating (FBG) vibration sensor is a sensing device that measures acceleration using the principles of optical fiber technology. FBGs are periodic refractive index variations embedded in an optical fiber core. These gratings can be used as sensors due to their sensitivity to various physical parameters, such as strain, temperature, and pressure. The FBG is typically attached to a mass or a mechanical structure that converts acceleration into strain, affecting the grating. As the grating experiences strain, the Bragg wavelength shifts. This shift can be detected by monitoring the reflection spectrum of the fiber Bragg grating. The main advantages of FBG acceleration sensors include their immunity to electromagnetic interference, compact size, lightweight, multiplexing capabilities, and long-term stability. They are often used in various applications, such as structural health monitoring, vibration detection, and seismic sensing.
To ensure the large resonant frequency, better sensitivity, sefl-temperature compensation, and later anti-interference capacity of the FBG vibration sensor, we designed and optimized FBG sensors by focusing on two main contents. Firstly, sensitivity enhancement of the accelerometer for low to medium frequency measurements. In the second part, the sensitivity enhancement of the FBG accelerometer for medium to high frequency. The main idea is emphatically designed and optimized for FBG sensors, including a V-type beam dual mass block structure and circular flexure hinge structure.
The theoretical research confirms the experimental results, and MATLAB® software optimizes the FBG sensor resonant frequency, sensitivity, and sensor dimensions. Concurrently, static structural stress and modal simulation analyses are conducted using ANSYS® software to validate the feasibility of the optimization outcomes. The performance of the sensors is evaluated through an experimental test. The results indicate that the accelerometers display excellent dynamic performance, making them suitable candidates for vibration measurement. These investigations have shown that the flexible hinge and beam structure holds promise for creating an FBG acceleration sensor with a compact size and high frequency, meeting the measurement demands in machinery equipment.

ABSTRACT iii
ACKNOWLEDGEMENT v
TABLE OF CONTENTS vi
LIST OF FIGURES viii
LIST OF TABLES xi
Chapter 1: INTRODUCTION 1
1.1 Overview 1
1.2 Thesis objectives 6
1.3 Organization of the dissertation 8
Chapter 2: LITERATURE REVIEW 11
2.1 Literature review related to 1D and 2D FBG vibration sensors for low- and medium-frequency 11
2.2 Literature review related to FBG vibration sensors for medium- and high-frequency. 14
Chapter 3: LOW AND MEDIUM FREQUENCY VIBRATION MEASUREMENTS 17
3.1 1D acceleration sensor based on a V-type beam 17
3.1.1 FBG vibration structure 17
3.1.2 Optimization parameter and simulation analysis of the sensor 20
3.1.3 Experiment and discussion 27
3.1.4 Conclusion 37
3.2 Low and medium frequencies of 2D vibration sensor 37
3.2.1 FBG sensor design 37
3.2.2 Optimization structure and simulation analysis 43
3.2.3 Experiment and discussion 51
3.2.4 Conclusion 64
Chapter 4: MEDIUM AND HIGH FREQUENCY VIBRATION MEASUREMENTS 65
4.1 Structural model of FBG vibration sensor 65
4.1.1 Sensor design 65
4.1.2 Sensor structure optimization 69
4.1.3 Experiment and discussion 75
4.2 Conclusion 85
Chapter 5: CONCLUSION AND FUTURE WORK 87
5.1 Conclusion 87
5.2 Future work 88
PUBLICATIONS 89
REFERENCES 91

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