- 學位論文
脈衝偏壓應變規量測系統之無線感測器應用
A Pulsed-Biasing Strain Gauge Measurement System for Wireless Sensing Applications
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摘要
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。
並列摘要
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%.
參考文獻
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