SUNEX IR Cut-off Filter Optics Concept

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.

SUNEX 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.

SUNEX purpose three types of filters:

- Reflective IR filters - Absorptive IR filters
- IR filters designed for day/night operations

Please contact OPTICS CONCEPT support team for details for more information.