Open AccessHigh resolution DAS via sinusoidal frequency scan OFDR (SFS-OFDR)
Author(s) -
Eyal Leviatan,
Avishay Eyal
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.033318
Subject(s) - frequency modulation , optics , modulation (music) , spatial frequency , phase modulation , linearity , signal (programming language) , materials science , phase (matter) , computer science , radio frequency , physics , acoustics , telecommunications , quantum mechanics , phase noise , programming language
There are many advantages to using direct frequency modulation for OFDR based DAS. However, achieving sufficiently linear scan via direct frequency modulation is challenging and poses limits on the scan parameters. A novel method for analyzing sinusoidal frequency modulated light is presented and demonstrated for both static and dynamic sensing. SFS-OFDR projects the measured signal onto appropriate sinusoidal phase terms to obtain spatial information. Thus, by using SFS-OFDR on sinusoidal modulated light it is possible to make use of the many advantages offered by direct frequency modulation without the limitations posed by the linearity requirement.