Pseudoheterodyne demodulation technique for fiber Bragg grating sensors using two matched gratings

• Type: Article in International Scientific Journal
• Date: 1997

Authors

Ferreira, LA (Author) Other; Santos, JL (Author) FCUP; Farahi, F (Author) Other

Journal

Title: IEEE Photonics Technology Letters

Vol. 9

Pages: 487-489

ISSN: 1041-1135

Publisher: IEEE

Indexing

ISI Web of Knowledge - 35 Citations

Scopus - 56 Citations

Scientific classification

FOS: Engineering and technology > Electrical engineering, Electronic engineering, Information engineering

Other information

Authenticus ID: P-001-BPJ

DOI: 10.1109/68.559397

Abstract (EN): A pseudoheterodyne, open-loop demodulation technique? for detecting wavelength shifts in wavelength encoded fiber Bragg grating sensors is presented, The scheme uses a processing Bragg grating that is identical to one used as a sensor, When the processing fiber grating is stretched periodically, the system of two gratings produces a carrier at this frequency with its phase modulated by the measurand signal applied to the sensing grating, The demodulation technique is intrinsically immune to fluctuation of optical power in the system and is independent of the source spectral profile characteristics. A resolution of approximate to 1 mu epsilon/root Hz for static axial strain was achieved.

Language: English

Type (Professor's evaluation): Scientific