Time-encoded WDM technique for multiple Bragg grating sensors interrogation

C. C. Kato; Luiz C. G. Valente; B. S. Olivieri; A. M. B. Braga; A. L. C. Triques; A. S. Ribeiro

doi:10.1117/12.623805

23 May 2005 Time-encoded WDM technique for multiple Bragg grating sensors interrogation

C. C. Kato, Luiz C. G. Valente, B. S. Olivieri, A. M. B. Braga, A. L. C. Triques, A. S. Ribeiro

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623805
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

Abstract

This work presents a system for the interrogation of optical fiber Bragg grating sensors based on time domain reflectometry and fixed filters. In this system, filtering is accomplished by fiber Bragg gratings, and a pulsed broadband light source is employed to illuminate the gratings. The spectral informations from the sensors are related to the ratio of two pulse intensities, each from a different filter. The signals are measured with a unique photodetection system, which makes detection independent of intensity variations and minimizes external influences on the circuit, such as variations in the environment temperature. Also, a small number of optical couplers and circulators are needed, so the interrogation system costs per sensor is considerably reduced. A test approach has been assembled for the interrogation of six sensors. Comparisons between experimental results and simulations show a good agreement. Extrapolations indicate that it would be possible to interrogate sensors with spectral variations up to 2 nm, providing uncertainties smaller than 5 pm, which is adequate for multiplexed sensing of temperature in a range of 200°C.

Citation Download Citation

C. C. Kato, Luiz C. G. Valente, B. S. Olivieri, A. M. B. Braga, A. L. C. Triques, and A. S. Ribeiro "Time-encoded WDM technique for multiple Bragg grating sensors interrogation", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.623805

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available