CAJ | 학술논문

为降低微小差动电容检测电路的复杂度，提高检测结果的温度稳定性，提出了一种结构简单，无总移相器、滤波器、解调器的全数字检测硬件平台；然后以此硬件平台为基础，设计了检测结果与检测激励信号幅值无关，无总稳幅及温度补偿电路的检测算法。将该技术应用于某差动电容型电子水平仪进行一次启动长期稳定性试验，结果表明在连续24 h内温度变化达12℃时，水平仪的输出变化不超过±1个字（±0.5″），具有优异的温度稳定特性。该技术还可应用于其他任意采用单频正弦信号进行激励的微弱信号检测，如动调陀螺信号检测、微位移传感器信号检测等。
위강저미소차동전용검측전로적복잡도，제고검측결과적온도은정성，제출료일충결구간단，무총이상기、려파기、해조기적전수자검측경건평태；연후이차경건평태위기출，설계료검측결과여검측격려신호폭치무관，무총은폭급온도보상전로적검측산법。장해기술응용우모차동전용형전자수평의진행일차계동장기은정성시험，결과표명재련속24 h내온도변화체12℃시，수평의적수출변화불초과±1개자（±0.5″），구유우이적온도은정특성。해기술환가응용우기타임의채용단빈정현신호진행격려적미약신호검측，여동조타라신호검측、미위이전감기신호검측등。
To reduce the complexity of differential capacitance detecting circuits and improve the temperature stability of the detecting results, a new all-digital detecting platform without hardware phase shifter, filter and demodulator is presented. Based on this hardware platform, a detecting algorithm is given. The amplitude of activating signal has no effect on the detecting result of this algorithm, so the amplitude stabilizing and temperature compensating circuit for activating signal can be removed. Long-term stability of a digital level gauge using this detecting technology is tested, showing that the error doesn’t exceed ±1LSB (±0.5″) when temperature variation reaches to 12℃ during 24 h. This detecting technology can also be used for the weak signal detectors adopting single frequency sinusoidal activating signal, such as dynamically tuned gyroscope detector and small displacement detector.