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the imperfection of optical devices in confocal imaging system deteriorates wavefront which results in aberration. This reduces the optical signal to noise ratio of the imaging system and the quality of the produced images. Adaptive optics composed of wavefront sensor and deformable mirror is a straightforward solution for this problem. In this paper, we described a blind optimization technique with...
We describe a low-coherence interferometric technique which we have used for 3-D mapping of impact craters produced in the laboratory. We also propose an approach to analyse the impact craters in terms of the Zernike polynomials. Preliminary results suggest that this set may provide a useful parametric representation, thereby enabling us to relate crater features to impact parameters.
Summary form only given. In conclusion, this system may provide useful information about reflecting interface layers inside transparent objects, at micron scale over a virtually unlimited range. In spite of the 8-bit intensity resolution and 56-dB dynamic range of the CCD camera, which theoretically limit the number of detectable air-glass interfaces to about 80, good images have been obtained in...
Summary form only given. We have presented a secure telecommunication system. The first security level is based on relative phase coding (requiring a specific decoder), while the second security level consists of sending false data which is then common-mode rejected at the decoder output.
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