Mirror based microscope with a super-long working distance in wide spectrum imaging

In order for satellite camera installations to make microsize observations at a working distance of hundreds of millimeters, a microscope with a super-long working distance is designed and established for the precise stitching assemblage of multi-window wide spectrum detectors and also for rigorous achromatic aberration. For the case of a numerical aperture of 0.23 the actual working distance is 225 mm and the wavelength ranges from 400 to 900 nm. This system highlights more potential applications for mirror and mirror lens based hybrid microscopy in industrial inspections by challenging the size of traditional optical microscopes. (paper)