We present a novel sensor system based on the principles of triangulation and elastography that allows intraoperative, endoscopic and non-contact acquisition of elastic tissue properties. The sensor system consists of a 3D-printed fiber-based fringe projector, a force application system to deform the tissue, and an endoscope that records the tissue deformation at a triangulation angle. This allows reconstruction of depth maps and the elastic behavior of the specimen. The measurement system is designed to be used during cystoscopy or transurethral bladder tumor resection and can be integrated into the working channel of a commercially available cystoscope.
Modern two-photon-polymerization 3D printing technology allows for the creation of almost arbitrary threedimensional structures for the production of complex freeform optical surfaces. While being highly controllable and accurate to below 100 nm some systematic deviation by volumetric changes during the polymerization and development process remains. This can however be corrected for when the surface deviation is known. We present a method to include repeatable measurements and the consequent shape correction during the production process of monolithically created complex freeform lens systems. Measurement concepts as well as consequences to shape improvements are shown. An example for the application of such corrections for the creation of low profile multi-aperture large field of view objectives is presented.
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