红外传感器的信号提取和数据采集的设计

Design of Signal Obtain and Data Acquire about Infrared Sensor

对于解决一类适合低频调制技术,且输出信号非常微弱的红外传感器的信号检测和提取,设计采用选频加窄带通滤波器的方法,再应用中位值平均滤波的数据采集方法很好地解决了对这一类红外传感器信号的数据采集。通过理论和实验证明该设计方法很好地提取了反映变化量性质的有用信号,同时也很好地提高了系统的信噪比,满足了实际情况的需要。

Considering the signal detecting and obtaining of infrared sensor with a weak output, adapted in low frequency modulating technology, used the method of narrow band-pass filter. Then the way of median average filter was used such that the problem of this kind of infrared sensor data collection was solved well. The method was proved to be able to obtain well the useful signals reflecting the properties of variables, meanwhile improving the signal-to-noise to system, and meeting the demand of actual situation.