差動電容式傳感器在智能電子水平儀中的應(yīng)用

提出了差動式傾角電容傳感器在分辨力為0. 001 mm/ m 的智能電子水平儀的應(yīng)用方案,采用ICL8038 集成芯片作為差動電容電橋的激勵電源,使用兩片LF398 同時對兩路電壓進(jìn)行采樣及AD7706 對采樣所得信號進(jìn)行A/ D 轉(zhuǎn)換,并給出了溫度和非線性補償方法要點及實驗結(jié)果。
關(guān)鍵詞: 電容式傳感器; 智能電子水平儀; 溫度補償; 非線性矯正
Abstracts : The application proposal of differential capacitive sensor in intellectual electronic level gauge with resolution 0. 001mm/ m was introduced. It used integrated chip ICL8038 to excite the differential capacitor bridge. Two LF398s was used to sample two voltage signals simultaneously and AD7706 was used to convert the sampling signals to digital signal.
Finally the key point for temperature compensation ,non2linearity correction and experiment results were introduced.
Key words : capacitive sensor ; intellectual electronic level gauge ; temperature compensation ; non2linearity correction