Quasi-distributed long-gauge fiber optic sensor system

Matjaž Linec (Author), Denis Đonlagić (Author)

Abstract

This paper presents a quasi-distributed, long-gauge, sensor system for measurement optical path length variation. This system can be directly applied to long gauge strain and/or temperature sensing. The proposed sensor system is comprised of sensing fiber, which is divided into the sensorćs segments separated by semi reflective mirrors made out of standard optical connectors. Short duration radio-frequency modulated optical bursts are launched into the sensing fiber and phase differences among individual reflected bursts are measured to determine the optical path-length variations among neighboring mirrors. Twenty sensing fiber segments were successfully addressed by a single-signal processor, while relying on standard telecommunication PIN diode, and a Fabry Perot laser diode. The resolution of a fiber-length variation better than 5 ìm was demonstrated in practice. Since the long sections of fiber can be employed for constructing individual sensors within the sensor's array, a microstrain resolution can be achieved in practice. The drift of the sensorćs system can be predominantly attributed to the temperature sensitivity of the electronic components, which proved to be below 20 um/°C. The entire system relies on simple and widely-used components that are low-cost.

Keywords

senzorji;optični senzorji;optična vlakna;senzorska vlakna;fotonika;optične komunikacije;optoelektronika;fiber optic systems;fiber optics sensors;sensing fiber;long-gauge;strain sensing;temperature sensing;optoelectronics;

Data

Language:	English
Year of publishing:	2009
Typology:	1.01 - Original Scientific Article
Organization:	UM FERI - Faculty of Electrical Engineering and Computer Science
UDC:	681.586.5
COBISS:	13292822
ISSN:	1094-4087
Views:	1716
Downloads:	98
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary keywords:	senzorji;optični senzorji;optična vlakna;senzorska vlakna;fotonika;optične komunikacije;optoelektronika;
URN:	URN:SI:UM:
Pages:	str. 11515-11529
Volume:	ǂVol. ǂ17
Issue:	ǂno. ǂ14
Chronology:	Jul. 2009
ID:	8717923