Temperature-Insensitive 2-D Pendulum Clinometer Using Two Fiber Bragg Gratings

Author

Bao, Hualong ; Dong, Xinyong ; Shao, Li-Yang ; Zhao, Chun-liu ; Chan, C.C. ; Shum, P.

Author_Institution

Inst. of Optoelectron. Technol., China Jiliang Univ., Hangzhou, China

Volume

22

Issue

12

fYear

2010

fDate

6/15/2010 12:00:00 AM

Firstpage

863

Lastpage

865

Abstract

A novel two-dimensional (2-D) clinometer has been demonstrated by attaching two fiber Bragg gratings (FBGs) on a deliberately designed pendulum composed of a tapered cylindrical beam and a mass. Due to the nonuniform tilt-induced strain field applied along the length of the FBGs, the bandwidths of their reflection spectra vary linearly with the applied inclination. By monitoring the reflected optical powers of the two FBGs, temperature-independent measurement of 2-D tilt angle is realized. In the experiment, a high sensitivity of 1.96 μW/degree over the inclination range from - 4° to 4° is achieved, and the accuracy for tilt angle measurement is ±0.125°.

Keywords

Bragg gratings; angular measurement; beams (structures); fibre optic sensors; pendulums; reflectivity; FBG; fiber Bragg gratings; nonuniform tilt-induced strain field; reflected optical powers; reflection spectra; sensitivity; tapered cylindrical beam; temperature-insensitive 2D pendulum clinometer; two-dimensional clinometer; Clinometer; fiber Bragg gratings (FBGs); fiber-optic sensors; temperature-insensitive;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2010.2046630

Filename

5443560