A method of measuring strain over 30-cm intervals to an accuracy of
10 microstrain in unaltered low-loss communications-grade single-mode
optical fiber is presented. The method uses a tunable external
cavity diode laser to measure the reflected intensity of a
reflector–fiber system as a function of wavelength. This
measurement is performed with no strain applied to the fiber to produce
a reference and then again after a strain has been induced. Cross
correlation of the Rayleigh scatter spectra from a selected section of
fiber in the strained and unstrained states determines the spectral
shift resulting from the applied strain.
© 1998 Optical Society of America
Equations on this page are rendered with MathJax. Learn more.