一种新颖的远红外信号处理系统

A Novel System for Far-infrared Signal Processing

设计了一个针对远红外信号处理的系统,从被动式远红外传感器得到的远红外信号极其微弱(几十个微伏),而且具有极窄的带宽(0.1Hz-10Hz)。介绍了通过抽取滤波的方法将远红外信号从强噪环境中提取出来,并通过环路失调电压消除的方法减小了系统的失调电压。系统的有效检测范围可达到10m^15m,与传统的远红外信号处理方法相比,该方法具有低功耗,可完全集成,低成本,可靠性高等优点。经仿真验证,该系统是完全正确的,而且在电路上是可实现的。

A system for far - infrared signal processing is designed, the far - infrared signal from the passive infrared sensor is very small （about few tens of μV） and have a narrow bandwidth （0.1Hz - 10Hz ）. Over - sampling decimation filter is introduced to extract far - infrared signal from the strong noise background in this system,and a loop dc offset cancellation is used to cancel out thedc offset voltage in the system, the detection range of the system is very large （about 10 to 15 meters）. Comparing with the conventional far - infrared signal processing methods, this system has the merits of low power consumption, fully integrated, low cost, and high reliability. After verification, this system is proved correct and realizable in circuit.