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Specifications:
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Centre Wavelength(CWL):
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850nm, and visible light range
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FWHM(50% point):
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850+/-20nm or +/-30nm
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Transmission:
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T>85% at CWL=850nm, and 400-680nm.
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Size:
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customized, from 2x2mm to Dia. 110mm, +/-0.1mm
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Thickness:
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0.3~3mm
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Surface quality:
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60/40~20/40
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Clear aperture:
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>90%, or full surface coatings
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Substrate:
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vary customized, such as B270, BK7, sodalime glass etc.
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850nm Day Night Filter is a common filter used for day night imaging systems, usually for CCD sensor, which is sensitive for a wide spectrum for image forming. This filters allow the full visible light transmit in the daytime to form a color image, and transmit the 850nm NIR light at night while 850nm LED light source power on, to form a black and white image. As this filter block most of NIR light except the 850+/-20nm or +/-30nm range, the color image in the daytime can be clearer.
Application: day night surveillance camera, biomedical identification, video door phone, video roll machine, digital telescope optical systems etc. |
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