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探空湿度传感器的信号调理电路设计

更新时间:2020-07-15 01:45:15 大小:301K 上传用户:zhiyao6查看TA发布的资源 标签:湿度传感器 下载积分:5分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

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针对高空气象湿度测量对高精度和低噪声提出的需求,设计了一种基于电荷放大器原理、用于探空湿度传感器的微弱电容检测电路。该电路由晶体振荡电路、电荷放大器电路、整流滤波、A/D转换、MCU等部分组成。实验结果表明:研制的检测电路具有较强的抗杂散电容性能,线性度良好,准确度优于0.04%。对于标称100pF的待测电容,噪声引起的误差仅相当于待测电容的100x10^-6(PPM),约10伊,能满足高空探测的要求。

It is challenging to achieve high accuracy, low noise for the humidity measurements in the field of upperair meteorological observation. To tackle this problem, a capacitance measuring circuit based on charge am plifier principle has been developed for sounding humidity sensors. It includes crystal oscillation, charge amplifiter, rectifying filter, A/D converter and MCU. The measurement results demonstrate that the circuit features several ad vantages, strayimmune, the linearity, and a high measurement accuracy of 0. 04% error. This circuit can achieve a capacitance resolution of 100 x 10^6( PPM ,RMS) from a nominal sensor capacitance of 100 pF, which indicates that the circuit is feasible for high altitude humidity sensing.

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探空湿度传感器的信号调理电路设计.pdf 301K

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