Intensity-referenced and temperature-independent curvature-sensing concept based on chirped fiber Bragg gratings

• Type: Article in International Scientific Journal
• Date: 2005

Authors

Romero, R (Author) FCUP; Frazao, O (Author) Other; Pereira, DA (Author) Other; H. M. Salgado (Author) FEUP; Araujo, FM (Author) Other; Ferreira, LA (Author) Other

Journal

Title: Applied Optics

Vol. 44 No. 18

Pages: 3821-3826

ISSN: 1559-128X

Publisher: Optical Society of America

Indexing

ISI Web of Knowledge - 27 Citations

Scopus - 33 Citations

Other information

Authenticus ID: P-000-2TR

DOI: 10.1364/ao.44.003821

Abstract (EN): An intensity-referenced temperature-independent curvature-measurement technique that uses a smart composite that comprises two chirped fiber Bragg gratings is demonstrated. The two gratings are embedded on opposite sides of the composite laminate and act simultaneously as curvature sensors and as wavelength discriminators, enabling a temperature-independent intensity-based scheme to measure radius of curvature. Also, the system's performance is independent of arbitrary power losses that are induced in the lead fibers to the sensing head. It is demonstrated that the measurement range depends on the relative positions of the chirped fiber Bragg gratings and on their spectral bandwidths. By using two chirped fiber Bragg gratings with bandwidths W-1 = 2.8 nm and W-2 = 3.7 nm and with central wavelengths at lambda(01) = 1560.3 nm and lambda(02) - 1563.7 nm, we obtained a resolution of 1.6 mm/(1)Hz for the measurement of the radius of curvature (similar to R = 350 mm) over the measurement range 190 mm < R < infinity. (c) 2005 Optical Society of America.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6