Non-Uniform Sampling Theory applied to FM Channel Optical Feedback Interferometry for Displacement Sensors - LAAS - Laboratoire d'Analyse et d'Architecture des Systèmes Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Non-Uniform Sampling Theory applied to FM Channel Optical Feedback Interferometry for Displacement Sensors

Résumé

In this paper, the optical feedback interferometry (OFI) signals obtained from the frequency modulated (FM) channel are processed by a non-uniform sampling (NUS) method to retrieve target displacements. The FM OFI channel signal is converted into its corresponding amplitude modulated (AM) signal using a free-space Michelson interferometer as an edge filter with a sensitivity of 1.3(GHz) −1 . The laser diode (LD) is operated in moderate optical feedback regime and its wavelength is modulated with a sinusoidal dithering signal applied on the LD driving-current. This dithering signal allows the recovery of sub half-wavelength displacements. Contrary to phase unwrapping methods, the proposed method based on NUS relies only on OFI's fringe detection to recover the target's displacement and thus is not affected by the non-linear response of the employed edge filter. In addition, compared to lock-in techniques, the dynamic range is not limited by the tuning range of the LD. Using a laser diode emitting at 1550 nm, the noise equivalent displacement for a 1 kHz bandwidth is approximately 8.4 nm and 0.9 nm for the AM-and the FM-channel, respectively.
Fichier principal
Vignette du fichier
IEEE_Sensors22__NUS_FM_AM_OFI_HAL.pdf (1.09 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03925513 , version 1 (05-01-2023)

Identifiants

Citer

Olivier Bernal, Han Cheng Seat, Frederic Surre, Usman Zabit, Clement Deleau, et al.. Non-Uniform Sampling Theory applied to FM Channel Optical Feedback Interferometry for Displacement Sensors. 2022 IEEE Sensors, Oct 2022, Dallas, United States. pp.1-4, ⟨10.1109/SENSORS52175.2022.9967106⟩. ⟨hal-03925513⟩
33 Consultations
23 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More