Fiber ring laser incorporating a pair of rotary long-period fiber gratings for torsion measurement

Leilei Shi; Tao Zhu; Fangyuan Chen; Kinseng Chiang; Yunjiang Rao

doi:10.1117/12.914366

30 January 2012 Fiber ring laser incorporating a pair of rotary long-period fiber gratings for torsion measurement

Leilei Shi, Tao Zhu, Fangyuan Chen, Kinseng Chiang, Yunjiang Rao

Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 83510K (2012) https://doi.org/10.1117/12.914366
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia

Abstract

We demonstrate a fiber ring laser for high-resolution torsion measurement, where the laser cavity consists of a Mach-Zehnder interferometer (MZI) formed with a pair of long-period fiber gratings written in a twisted single-mode fiber (SMF) by a CO₂ laser. The emitting wavelength of the laser provides a measure of the rate of the torsion applied to the grating pair, while the direction of the wavelength shift indicates the sense direction of the applied torsion. The narrow linewidth and the large side-mode suppression ratio of the laser can provide a much more precise measurement of torsion, compared with passive fiber-optic torsion sensors. The torsion sensitivity achieved is 0.084 nm/(rad/m) in the torsion range ±100 rad/m, which corresponds to a torsion resolution of 0.12 rad/m, assuming a wavelength resolution of 10 pm for a typical optical spectrum analyzer.

Citation Download Citation

Leilei Shi, Tao Zhu, Fangyuan Chen, Kinseng Chiang, and Yunjiang Rao "Fiber ring laser incorporating a pair of rotary long-period fiber gratings for torsion measurement", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 83510K (30 January 2012); https://doi.org/10.1117/12.914366

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