The following combination lens, which looks like a “sandwich cookie”, is commonly used in industrial cameras. The outer layer is a band-pass filter used to selectively allow light of a specific wavelength to pass through, while the green glass in the middle is the blue glass of an absorption-type filter, providing a deep cutoff depth.
The three-in-one filter or filter scheme can significantly improve the image quality of industrial cameras and enhance the contrast of target features through selective filtering. It is an effective means to solve many problems in industrial visual inspection.hashtagopticalfilter hashtagbandpass hashtagCCD hashtagCMOS hashtagbluecolorglass hashtagcombinationfilter