臺灣博碩士論文加值系統

應變規廣泛使用在許多精密測量系統，這類應用被部署後不希望更動，所以應變感測器需要有很長的電池壽命。最近，這些感測器可用於監測旋轉設備，例如風車和車輪，提供災難性故障的預警，避免危害公共安全。因為無法使用傳統有線的感測器，無線應變感測器就變成相當的重要。
利用脈衝偏壓的方式在電力資源極少的無線感測器上，達到節省能源、拉長使用時間的效果。此外沒有使用恆定的電流，除了可以減少功率消耗，還可以減少應變計的溫度測量誤差。我們利用此技術實際做出無線感測應變規，並且在此架構中進行驗證，在使用32Hz、40%的工作週期下，量測誤差可視為可忽略，在此條件下有效的延長了約50%的使用時間。此研究應用的領域相當的廣泛，目前已經協助風力發電機組葉片應力變化的量測實驗，未來更可以使用在眾多需要監控應力變化的地方，來協助人民保障生命財產安全。

This paper presents a pulsed-biasing strain gauge measurement system for wireless sensing applications. The use of pulsed-biasing on the strain gauge can reduce the power consumption of the sensor, which is crucial for low-power wireless sensors. Moreover, without using a constant bias current, power dissipated on the resistive bridge that includes the strain gauge can be reduced. Such reduction can also reduce measurement errors from an increased strain gauge temperature. A strain gauge wireless sensor was constructed using commercially available components. Measurement results show that the pulsed-biasing technique can be implemented with a duty cycle down to around 40% with negligible measurement error at a data rate of 32 Hz. The power saved is equivalent to an increased operation time of 50%.

口試委員會審定書 #
誌謝 i
中文摘要 ii
英文摘要 iii
目錄 iv
圖目錄 vii
表目錄 x
第1章 緒論 1
1.1 研究動機 1
1.2 文獻探討 2
1.2.1 電阻式應變規 2
1.2.2 惠斯登電橋 3
1.2.3 脈衝偏壓 4
1.2.4 無線感測器 6
1.3 論文架構 7
第2章 系統元件介紹 9
2.1 電阻式應變規 9
2.1.1 應變係數（Gauge Factor, G.F.） 9
2.1.2 溫度膨脹係數（Linear Expansion Coefficient, ） 10
2.1.3 配合惠斯登電橋的量測方式 11
2.2 類比數位轉換器 15
2.2.1 逐次逼近類比數位轉換器 16
2.2.2 管道模擬類比數位轉換器 16
2.2.3 類比數位轉換器 17
2.3 可編程輯閘陣列 20
2.4 脈衝偏壓 21
第3章 系統架構 23
3.1 應變規與惠斯登電橋配置 24
3.2 電力架構 24
3.3 類比數位轉換器 25
3.4 控制單元 26
3.5 無線收發模組 27
3.6 脈衝偏壓架構的實現 29
3.7 訊號處理 30
3.8 電路板設計 30
第4章 量測與量測結果 33
4.1 量測架構 33
4.2 校正 34
4.3 效率與精準度分析 38
4.4 電力分析 44
4.5 熱分析 45
第5章 結論與未來展望 47
5.1 結論 47
5.2 未來展望 47
5.2.1 增加傳輸距離 48
5.2.2 減少或是修正熱效應 48
5.2.3 組成量測系統 48
5.2.4 應用在非電阻式感測器 48
參考文獻 50
論文著作 52

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