Integration of Zero Crossing Method in a Non-Uniform Sampling System using Optical Feedback Interferometry
Résumé
In this paper, a zero-crossings based method is proposed to improve the displacement sensing performance of nonuniform sampling (NUS) theory based use of optical feedback interferometry (OFI) under moderate optical feedback regime. The incorporation of zero-crossings as phase quantization levels allows doubling the samples for subsequent interpolation, without using any dithering scheme. When compared to the simple dither-free NUS method, the proposed method yields an overall improvement in RMS error over a wide range of target motion amplitudes and frequencies, with maximum improvement at low amplitudes. Experimentally, an improvement of up to 87% is obtained in precision as compared to simple NUS system for an OFI sensor with laser wavelength of 785 nm.
Origine | Fichiers produits par l'(les) auteur(s) |
---|