Abstract
The femtosecond laser-induced fiber Bragg grating is an effective sensor technology that can be deployed in harsh environments. Depending on the optical fiber chosen and the inscription parameters that are used, devices suitable for high temperature, pressure, ionizing radiation and strain sensor applications are possible. Such devices are appropriate for aerospace or energy production applications where there is a need for components, instrumentation and controls that can function in harsh environments. This paper will present a review of some of the more recent developments in this field.
Highlights
Over the past three decades, fiber Bragg gratings (FBGs) have been used effectively as sensors for a wide variety of applications [1]
For Bragg gratings written in standard single-mode germanium-doped telecom fiber in the telecom band, the achievable tuning of λB is less than 2 nm
Schematic of the fiber laser cavity. In this this review review paper, paper, recent recent developments developments in in manufacturing manufacturing of of femtosecond femtosecond laser laser induced induced fiber fiber
Summary
Over the past three decades, fiber Bragg gratings (FBGs) have been used effectively as sensors for a wide variety of applications [1]. The FBG device is an optical filter that is created within the core of an optical fiber waveguide using a high-power laser It reflects a specific Bragg resonant wavelength of light, λB , that depends on the grating periodicity, ΛG , of the laser-induced modulation of the refractive index, ∆n, that makes up the grating structure in the waveguide core region. Temperature induced changes in the glass refractive index through the thermo-optic effect, and the thermal expansion coefficient of the fiber, allow the FBG to act as a temperature sensor. By using certain exposure conditions and specific laser wavelengths, FBGs can be written that are thermally stable up to the glass transition temperature tG of the material These thermally stable gratings are ideal for high temperature sensing applications. Interested readers are referred to the review articles [12,13] for more information
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