We designed and demonstrated what we believe to be a novel sensor for simultaneous measurement of stress and temperature. A fiber Bragg grating is flatly adhered to the surface of a loop thin-wall section beam. The theoretical analyses and the experimental results show that both the central wavelength shift and the chirped bandwidth of the grating reflection spectrum have a linear relationship with the stress and the temperature, respectively, and the slopes of them are different. Therefore, the temperature and stress can be discriminated by interrogating the chirped fiber grating. Moreover, we also investigated the strain of the loop thin-wall section beam, and the results show that the strain is cosine proportional to the double positional angle.
© 2006 Optical Society of America
Original Manuscript: July 7, 2005
Revised Manuscript: January 11, 2006
Manuscript Accepted: February 28, 2006
Lifang Xue, Jianguo Liu, Qida Zhao, Tuan Guo, Guiling Huang, and Xiaoyi Dong, "Simultaneous measurement of stress and temperature with a fiber Bragg grating based on a loop thin-wall section beam," Appl. Opt. 45, 4810-4814 (2006)