電容式位移傳感器轉(zhuǎn)換電路的設計

介紹一種用于動平衡分析儀差動電容式位移傳感器信號轉(zhuǎn)移電路。利用差動測量技術,
將由振動引起的微小電容變化量轉(zhuǎn)化成交流電壓信號。電路由差動放大電路、正弦信號發(fā)生器、模擬乘法器和二階低通濾波器組成,該電路線路簡單、集成度高、便于調(diào)試。通過電壓轉(zhuǎn)換電路可以將- 10～ + 10 V 的輸出電壓轉(zhuǎn)變成為0～5V 的電壓,便于帶有A/ D 轉(zhuǎn)化電路的單片機系統(tǒng)直接進行A/ D 轉(zhuǎn)換,簡化了電路設計。實驗表明該轉(zhuǎn)換電路具有較好的線性和抗干擾性。
關鍵詞:電容傳感器;動平衡;電路;差動測量
　　Abstract :A transform circuit of capacitance sensor for dynamic balance instrument was given. By using a method of differnetial measurement ,it is can be used to detect a low capacitance changes caused by vibration. The circuit is consisted of differential amplifier circuit ,Signal generator ,Analog multipler and low - pass Filter. The circuit is simple and the inte2 gration is good. The voltage converted into 0～5 V using convering circuit can be used directly by microprocessor ,and con2 verted into digital signals by A/ D converting. So this simplifies the design of the circuits. The test showed that this circuit had a good linear charactre and anti - jamming.
Key Words :Capacitance Sensor ;Dynamic Blance ;Circuit ;Differential Measurement