Bitte wählen Sie ihr Lieferland und ihre Kundengruppe
An 'in situ' holographic technique, based on the use of a flexible miniaturized endoscope with a diameter of less than 1 mm has been developed for medical applications. The holographic process provides quantitative informations on the three-dimensional geometry of the observed scene, including deformations and movements. The holographic systems presented here is based on the use of a multimode fiber bundle as a recording medium for the endoscopic holograms. The hologram is obtained by the interference between the light reflected by the object and a reference beam travelling back along the axis of the multimode fiber bundle. The interferogram, sampled on the multimode fiber bundle tip, is then treated electronically. The image is reconstructed numerically. The performances of the flexible endoholoscope have derived theoretically and the results presented in a previous symposium. the first comparison of the theoretical predictions and experimental results are presented in this communication. The experimental setup has been designed to match the conditions of the calculations. Reconstructed images show the capability of the microendoscopic system to restore three-dimensional inforamtions of the observed scene. The limitations of the process have been evaluated by measuring the resolution limit and it has been compared with the theoretical and numerical predictions.