- 會議論文
以通用型數位訊號控制器為架構之表面聲波量測系統研製
A Study of General Purpose Digital Signal Controller for SAW Measurement System
摘要
表面聲波(SAW)感測器的精度高，具有數位方式的值輸出、體積小、功耗低、抗干擾力強、可靠性高等優點。傳統加速度計由離散機械和電子元件製造的切換開關還需要一個小球來回應慣性的變化，使這些感測器相對滯後，而且它們價格高昂。本研究主要在於SAW型式感測器的訊號量測系統，利用MICROCHIP公司推出的dsPIC33數位訊號控制器系統晶片控制市售之RF晶片作為發射端與接收端，並針對SAW的特性設計中心頻率搜尋程式，目的是要在物體產生形變時可即時量測出其變化程度，並即時監測。其訊號使用RSSI強度來判斷SAW當時的中心頻率值，並與未產生變化時之狀態比較，計算出頻率漂移程度。
關鍵字
無資料並列摘要
In this study, we try to develop a measurement architecture using a dsPIC General Purpose Digital Signal Controller chip to control the RF chips (CC1101) to achieve the transmitting and receiving task for measuring the micro strain of the SAW sensors attached on a rotational axis. When the stress is applied on the SAW devices, the center frequency of SAW sensors will change. Therefore, measuring the shift of the center frequency of SAW sensors can be used to obtain the applied torque or vibration of the rotation axis. The measuring system mainly uses the RSSI signal with respect to the frequency to find the SAW center frequency value, and then the value of frequency shift can be transferred to the torque values. Besides, to achieve the wireless transmission, a coupling-type antenna is applied on the axis. Finally, the torque signal is passed through UART and CANBUS to integrate with the other vehicles electron systems.