In detail, the optical receiving system is mainly composed of optical receiving lens, modulating disk, cut off filter, focusing lens and pyroelectric detector.
其中，光学接收系统主要包括光学接收镜头、调制盘、截止滤光片、窄带干涉滤光片、聚焦透镜及光电转换系统等；
The simulation result shows that the dynamic response and the detection precision in detection circuit can be greatly influenced by the cut-off frequency, order and type of low pass filter.
结果表明，低通滤波器的截止频率、阶数和类型对检测电路的动态响应过程、检测精度都有很大影响。
It is also found that the better recognition effects can be obtained when the signal's noise was cut off by the two-level adaptive filter.
通过对测试信号进行分析，发现信号经二级自适应滤波去噪后，可得到更好的检出效果。
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