Related Experiment Video
Updated: Jul 7, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
Distributed measurement of static strain in an optical fiber with multiple bragg gratings at nominally equal
Abstract:
The Fourier transform relationship between the reflected light froma Bragg grating and the complex spatial modulation of the Bragg grating is used to produce a distributed strain sensing system. A tunable external cavity diode laser along with a reference reflector in anoptical fiber are used to produce a measurement of the phase and amplitude of the reflected light from the modulated Bragg grating as a function of wavelength. The system is demonstrated with 22 Bragg gratings in a single fiber on a cantilever beam and compared with foil strain gauge readings.
Related Concept Videos
Measurements of Strain
Design Example: Strain Gauge Bridge or Wheatstone Bridge

