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China IR Cut Off Filter Suppliers
Infrared (IR) cut-off filters are used with color CCD or CMOS imagers to produce accurate color images. An IR cut-off Filter blocks the transmission of the infrared while passing the visible. This can be done with two optical techniques: absorption or reflection. Absorptive filters are made with special optical glass that absorbs near infrared radiation. Reflection type filters are short-pass interference filters that reflect infrared light with high efficiency. We offer two types of absorptive filters: IRC20 and IRC21 and two types of reflective IR filters: IRC30 and IRC40 which is a new type of reflective filter suitable for day/night security cameras. It allows both visible and infrared LED light to pass through. The absorptive filters are recommended for CCD imagers while the reflective CMOS imagers. Our standard off-the-shelf filters are listed blow. If you need a custom filter, please contact our support.