CAJ | 학술논문

为了提高电感传感器的检灵敏度和系统信噪比，基于微弱信号检测原理，设计了以低失真文氏电桥正弦波振荡电路为激励信号源，以差动放大电路为信号处理核心的微弱信号处理电路，同时采用变压器对载波信号进行隔直，提高了系统的检测灵敏度，电路结构简单、实用、可靠。实验结果表明，改电路能有效提高系统信噪比，满足系统对噪声不大于0.005 V的要求。
위료제고전감전감기적검령민도화계통신조비，기우미약신호검측원리，설계료이저실진문씨전교정현파진탕전로위격려신호원，이차동방대전로위신호처리핵심적미약신호처리전로，동시채용변압기대재파신호진행격직，제고료계통적검측령민도，전로결구간단、실용、가고。실험결과표명，개전로능유효제고계통신조비，만족계통대조성불대우0.005 V적요구。
In order to improve the detecting sensitivity of inductive sensor and system signal-to-noise ratio, Wien bridge sine wave oscillator circuit with low distortion for excitation signal and weak signal processing circuit is designed. Transformer is used to block the part of DC in carrier signal for improving the detection sensitivity of the system. The structure of circuit is simple, practical and reliable. Experimental results showed that circuit system can effectively improve the signal-to-noise ratio and the noise of system.