The only effective method of fiber Bragg grating (FBG) strain modulation has been by changing the distance between its two fixed ends. We demonstrate an alternative that is more sensitive to force based on the nonlinear amplification relationship between a transverse force applied to a stretched string and its induced axial force. It may improve the sensitivity and size of an FBG force sensor, reduce the number of FBGs needed for multiaxial force monitoring, and control the resonant frequency of an FBG accelerometer.
© 2013 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: November 14, 2012
Revised Manuscript: December 5, 2012
Manuscript Accepted: December 5, 2012
Published: January 22, 2013
Kuo Li, Man Hong Yau, Tommy H. T. Chan, David Thambiratnam, and Hwa Yaw Tam, "Fiber Bragg grating strain modulation based on nonlinear string transverse-force amplifier," Opt. Lett. 38, 311-313 (2013)