Optical
Filters>OLPF Filters
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Optical Lowpass Filters(OLPF) |
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day night filter curve
day filter curve
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Application:
Digital cameras,digital vidicons,CCTV,PC cameras,mobile
phones,surveillance camera,IP cameras,day
night camera,security cameras,IR camera,video phones
Substrate:
B270/D263T/BK7/blue glass/quartz crystal
Dimension: (unit:mm)
12.8*11.8 (1/2'), 8.8*8.2(1/3'),
7.8*7.3(1/4'), 6.0*5.0(1/5')
Thickness:0.75,1.08,1.22,1.63(according to CCD sensor)
Layers:1~6
Custom design dimension available
Spectral Data:
T>75% @ 400nm,T<5% @ 700nm
T>85% @ 450nm,T<3% @ 750～1000nm
T=50% @ 645±10nm,T<10% @ 1100nm
IR coating and AR coating available on requests
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In high-quality digital maging systems, optical low-pass filters (OLPF) are used to
eliminate color Moire fringes. An OLPF cuts off the lens MTF
above the sampling frequency of the imager resulting an overall
MTF curve that approximates a step function in spatial domain.
IR cut-off function is often incorporated into OLPF as well.
For a day night OPLF filter,it allows both visible and infrared LED light to pass through. This
allows the camera to see a color image during day light and a
monochrome image at night time with infrared LED illumination.
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