title: Transverse load sensing by use of pi-phase-shifted fiber Bragg gratings.
abstract: The birefringence of a pi -phase-shifted fiber Bragg grating can be determined with high accuracy by measurement of the polarization-induced spectral splitting of its narrow central transmission window. The use of this feature for sensing of a load applied in the direction transverse to the optical fiber is demonstrated. A distributed force resolution of 1.4x10(-3) N/mm was obtained, which corresponds to a difference in the principal strains of the fiber core of 0.5mu? . We also show that the transverse load response of the sensor is insensitive to temperature.
authors: M
authors: M
authors: Leblanc
authors: S T
authors: ST
authors: Vohra
authors: T E
authors: TE
authors: Tsai
authors: E J
authors: EJ
authors: Friebele