Adaptive photodetector versus conventional method for localizationof the Talbot self-images

摘要

We present the experimental study of a new method that uses an adaptive photodetector based on the non-steady-state photoelectromotive force (photo-EMF) effect for measuring the visibility of the Talbot patterns generated by a Ronchi grating. It was demonstrated that the photo-EMF based detector could be used for efficient localization of planes with minimal and maximal visibility in real time, with high spatial resolution and without any signal processing. The possibility for localization of self-images in turbid media was also investigated. Finally, the performance of our method was compared against conventionally used method based on analysis of images obtained by CCD camera.