The DIN 58197-3-2002 standard specifies the minimum requirements for neutral splitting films in Optical inspection films. This standard applies to Optical inspection components that require neutral splitting films, especially in beam splitters, filters and Miscellaneous Optical inspection systems. The standard details the basic performance requirements of neutral splitting films, including Optical inspection characteristics, coating uniformity, environment performance, etc., to ensure that the film has good Optical inspection mass and Stability. By standardizing these minimum requirements, DIN 58197-3-2002 contributes to the Reliability and conformity of Optical inspection film products and promotes technical standardization and quality control in the field of Optical inspection.