In detail, the optical receiving system is mainly composed of optical receiving lens, modulating disk, cutofffilter, focusing lens and pyroelectric detector.
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。
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It is also found that the better recognition effects can be obtained when the signal's noise was cutoff by the two-level adaptive filter.