Ultra-high resolution strain sensing by phase-sensitive interrogation of a passive fiber Bragg resonator

Malcolm B. Gray; Jong H. Chow; Ian L. M. Littler; David E. McClelland

doi:10.1117/12.623272

23 May 2005 Ultra-high resolution strain sensing by phase-sensitive interrogation of a passive fiber Bragg resonator

Malcolm B. Gray, Jong H. Chow, Ian L. M. Littler, David E. McClelland

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623272
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

Abstract

We demonstrate and compare two similar pico-strain sensing techniques by laser frequency locking to a passive Bragg grating Fabry-Perot resonator. One technique uses auxiliary phase modulation while the other employs current modulation of the diode laser source. The former is based on the Pound-Drever-Hall locking technique, while the latter is its variant, as current modulation introduces both amplitude and frequency modulation. The two modulation schemes utilize radio-frequency sidebands to derive error signals from the complex optical response of the fiber Bragg resonator. Experimental results are presented that demonstrate when the laser is locked, these methods detect differential phase shift between the optical carrier and the sidebands, due to minute fiber optical path displacements.

Citation Download Citation

Malcolm B. Gray, Jong H. Chow, Ian L. M. Littler, and David E. McClelland "Ultra-high resolution strain sensing by phase-sensitive interrogation of a passive fiber Bragg resonator", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.623272

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