High-resolution interrogation of tilted fiber Bragg gratings using an extended range dual wavelength differential detection.
Opt Express
; 28(10): 14662-14676, 2020 May 11.
Article
em En
| MEDLINE
| ID: mdl-32403503
ABSTRACT
An extended range dual wavelength differential detection technique for interrogating fiber Bragg grating sensors is implemented for the measurement of tilted fiber Bragg gratings. The dynamic chirp of a single DFB laser diode modulated with a square wave is used to generate two pairs of wavelengths, in the high and low modulation states, with a separation approximately equal to the bandwidth of the TFBG, resulting in a doubling of the range of the DWDD measurement. A spectral resolution of 0.08 pm and a refractive index resolution of 9.9 × 10-6 are obtained over a range of refractive index of 3.7 × 10-2, corresponding to 11.9 bits of resolution.
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Base de dados:
MEDLINE
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article