![]() Targets are also available with sector star (also known as Siemens star) patterns, Ronchi rulings, a variable line grating, or a combination of patterns for resolution and distortion testing. Thorlabs offers resolution test targets with 1951 USAF, NBS 1952, and NBS 1963A patterns. By identifying the largest set of non-distinguishable lines, one determines the resolving power of a given system. They consist of reference line patterns with well-defined thicknesses and spacings and are designed to be placed in the same plane as the object being imaged. Resolution test targets are typically used to measure the resolution of an imaging system.
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