IR-CUT Filter Transmission Meter Test Camera Filter

The IR CUT Dual Filter is a filter used in the camera lens that automatically switches the filter according to the intensity of external infrared light to cut off infrared or let it pass. Infrared (IR) cut filters are used together with color CCD or CMOS imagers to produce accurate color images. The infrared cut filter prevents the transmission of infrared light when it passes through visible light. This can be done by two optical techniques: absorption or reflection. The absorptive filter is made of special optical glass that absorbs near-infrared radiation. The reflective filter is a short-pass interference filter that can efficiently reflect infrared light. The IR-cut filter transmission meter can measure 850nm and 940 nm infrared transmittance of the camera's IR-CUT dual filter.

There are various wavelengths of light in nature. The human eye recognizes light in the wavelength range of 380nm-760nm. Lights exceeding 380nm-760nm cannot be seen by human eyes, such as infrared light and ultraviolet light. The imaging components of the camera, CCD or CMOS, can see most of the wavelength of light. Due to the participation of various light, the color restored by the camera and the naked eye are different in color, in order to solve the color shift problem: The current scheme is to place a double-layered filter in front of the CCD in a single layer or multiple layers (while allowing visible light and infrared light to pass through).