Title :
Temperature-Insensitive Pendulum Clinometer Using Two Fiber Bragg Gratings for 2D Tilt Angle Measurement
Author :
Bao, Hualong ; Dong, Xinyong ; Zhang, Shuqin ; Zhao, Chunliu ; Chan, C.C. ; Shum, P.
Author_Institution :
Inst. of Optoelectron. Technol., China Jiliang Univ., Hangzhou, China
Abstract :
A novel two-dimensional (2D) 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 2D tilt angle is realized. In the experiment, a high sensitivity of 1.96 ¿w/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; fibre optic sensors; optical fibres; reflectivity; 2D tilt angle measurement; fiber Bragg gratings; nonuniform tilt-induced strain field; reflected optical powers; reflection spectra; tapered cylindrical beam; temperature-independent measurement; temperature-insensitive pendulum clinometer; Bandwidth; Bragg gratings; Capacitive sensors; Fiber gratings; Goniometers; Joining processes; Monitoring; Optical reflection; Optical sensors; Temperature measurement;
Conference_Titel :
Communications and Mobile Computing (CMC), 2010 International Conference on
Conference_Location :
Shenzhen
Print_ISBN :
978-1-4244-6327-5
Electronic_ISBN :
978-1-4244-6328-2
DOI :
10.1109/CMC.2010.140
