- obpf optical band pass filter
- 光带: light band; slit of light
- 通: open up or clear out by poki ...
- 滤波器: electric filter; wave filter ...
- 带通滤波器: band-pa filter; bandpass optical filter; bandpass filters; bandpassfilter; bf band pass filter; bf band filter; bpf band pass filter; bpf bandpass filter; bpf=band pass fliter; low-and-high-pass filter; narrowband filter
- 通带通滤波器: if band pass filter
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