Concentric Ring & Grid Optical Calibration Target

This item is an optical calibration target from Applied Image with concentric rings and a grid pattern. It is a generic product type, not tied to one identified catalogue number. Calibration targets are printed or etched on glass, film or other substrates and are used to test lenses, cameras and machine vision systems. A concentric ring pattern helps to evaluate centring, distortion and field curvature, while a grid is used for distortion measurement, pixel scale calibration and geometric calibration of imaging systems. Targets can be reflective for front lit use or transmissive for backlit use. Accuracy of line placement is usually in the micron range, and the substrate flatness matters in precision measurement. Typical uses include camera calibration in vision systems, lens quality control, microscopy and imaging system alignment, and machine vision inspection set-up.