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Infrared (IR) cut-off filters are used with color CCD or CMOS imagers to produce true color images. An IR cut-off filter blocks the transmission of the infrared while passing the visible.The frequently used Specifications are as below: Material Float glass, B270, BK7 or other Dimension Tolerance +0.0/-0.1mm Thickness 0.3, 0.5, 0.7 and 1.1mm or other Surface Quality 60/40 or better Clear Aperture >90% Coating 1 400nm-620nm Tavg>92% 400nm-620nm Tmin>85% 645±10 nm T=50% 700nm-1100nm Tavg<1.5% 700nm-1100nm Tmax<3% Coating 2 400nm-620nm Tavg>94% 400nm-620nm Tmin>90% 650±10 nm T=50% 700nm-1100nm Tavg<1.5% 700nm-1100nm Tmax<3% Coating 3 400nm-600nm Tavg>92% 400nm-600nm Tmin>85% 630±10 nm T=50% 650nm-750nm Tmax<1.5% 830±10 nm T=50% 865±10 nm T=50% 850±10 nm T>85% 900nm-1100nm Tavg<1.5% 900nm-1100nm Tmax<3% Coating 4 400nm-620nm Tavg>90% 400nm-620nm Tmin>83% 650±10 nm T=50% 910±10 nm T=50% 960±10 nm T=50% 940±10 nm T>85% 1000nm-1100nm Tmax<3.5%
Material
Float glass, B270, BK7 or other
Dimension Tolerance
+0.0/-0.1mm
Thickness
0.3, 0.5, 0.7 and 1.1mm or other
Surface Quality
60/40 or better
Clear Aperture
>90%
Coating 1
400nm-620nm Tavg>92% 400nm-620nm Tmin>85% 645±10 nm T=50% 700nm-1100nm Tavg<1.5% 700nm-1100nm Tmax<3%
Coating 2
400nm-620nm Tavg>94% 400nm-620nm Tmin>90% 650±10 nm T=50% 700nm-1100nm Tavg<1.5% 700nm-1100nm Tmax<3%
Coating 3
400nm-600nm Tavg>92% 400nm-600nm Tmin>85% 630±10 nm T=50% 650nm-750nm Tmax<1.5% 830±10 nm T=50% 865±10 nm T=50% 850±10 nm T>85% 900nm-1100nm Tavg<1.5% 900nm-1100nm Tmax<3%
Coating 4
400nm-620nm Tavg>90% 400nm-620nm Tmin>83% 650±10 nm T=50% 910±10 nm T=50% 960±10 nm T=50% 940±10 nm T>85% 1000nm-1100nm Tmax<3.5%
Other types are available upon request.
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