Showing papers by "Dimitris Maroulis published in 2002"

The electronics of a control system for micromirrors in a laser-scanning device

Abstract: The electronics and software developed for the control system of a micromirror-based laser-scanning endoscope are presented in conjunction with features of the micromirrors and their driving requirements. These micromirrors, which are crucial for the laser-scanning operation of the endoscope device, are embedded in the endoscope head and have been manufactured using silicon MEMS (Micro Electro-Mechanical Systems) technology. The micromirrors are electrostatically deflected and driven by appropriate high-voltage waveforms created in the control system. This computer-based system, using appropriate software, generates the control waveforms, which, after adequate amplification, drive the scanning micromirrors. The electronics developed are capable of generating control voltages with amplitudes up to 440 V pk-pk, within a bandwidth from DC to 20 kHz, and ensures an electrostatic driving of scanning micromirrors with a high positioning accuracy in the sub-pixel range.

The data-acquisition, processing and control system of a micromirror-based laser-scanning endoscope

Abstract: A novel endoscope device has been developed based on a new technology of laser scanning using silicon micromirrors for superior resolution and chromatic representation compared with the existing endoscopes. A critical part of this device, that is reported here, is the data-acquisition, control and processing (DACP) system which acquires, processes, displays, stores in real time the collected images and handles the control signals. The software developed uses the multithreading technology for the parallel execution of specific software tasks in the available CPUs of the multiprocessing system employed. In this manner, the necessary computational power is provided for the realization of a high-performance real-time imaging system. First-trial results are also given.