Fiber Optic Temperature And Strain Sensors

An experimental–numerical investigation of hydrothermal response in adhesively bonded composite structures

“…Thus, in a uniform grating, when white light is transmitted through an optical fiber containing a FBG, a narrow-band of light is 5/29 3/11/2015 reflected back. The central wavelength of the light reflected by the Bragg grating, λ B , depends on the effective refractive index of the fiber core, n eff , and the grating period, Λ, [20,21]:…”

Process-induced strains in RTM processing of polyurethane/carbon composites

“…Thus, when a white light is transmitted through this fiber, a narrow-band of the spectrum is reflected back by the grating. The wavelength of the reflected light, k B , depends on the effective refractive index of the fiber core, n eff , and the grating period, K 0 , according to the Bragg condition [15].…”

A wavelength tunable Q-switched fiber laser using fiber Bragg gratings

“…The proportionality coefficient 0.78 is determined by the optical elastic effect [3]. Equation (10) indicates that the ratio Dl B / l B is proportional to the ratio of the changes in the FG length.…”