A Simple Spectral Interrogation System for Optical Fiber Sensors

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Santos, (Author) Other; Jorge, (Author) Other; Almeida, (Author) Other; Coelho, (Author) FCUP

Journal

Title: Proceedings

Vol. 35

Final page: 6

ISSN: 2504-3900

Publisher: MDPI

Other information

Authenticus ID: P-00Q-VM2

DOI: 10.3390/proceedings2019015006

Abstract (EN): <jats:p>Optical fiber sensors (OFS) based on long-period fiber gratings (LPFG) or on surface plasmon resonance (SPR) represent attractive solutions for detection systems in remote areas. An interrogation system consisting on wavelength modulation of fiber coupled distributed feedback (DFB) lasers was implemented and tested. The system uses a single photodetector to individually acquire the intensity of each DFB laser modulated by the OFS and the real transmission spectrum is reconstructed through curve fitting. Testing was accomplished by measuring the spectral features of an LPFG when changing the surrounding refractive index and errors lower than 1.8 nm in the 1530 to 1570 nm wavelength region were obtained.</jats:p>

Language: English

Type (Professor's evaluation): Scientific