Since the beginning of the century Distributed fibre optic Strain Sensing (DSS) has been an emerging technique for geo and structural deformation monitoring. As a key component of SHM, wing deformation monitoring is of great significance for ensuring flight safety and reducing maintenance costs. The traditional strain gauge measurement method can no longer meet the needs of modern aeronautical engineering.
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5/125 μm are both available; orange (OM1/OM2), OM3 (aqua), and OM4 (magenta) colors. 5m to 2m—that has a factory-terminated connector on one end and bare fiber on the other end. A pigtail fiber indicates a short length of optical fiber cable that has a pigtail connector (for example, SC, FC, ST, LC, etc.
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A fiber Bragg grating (FBG) is a type of constructed in a short segment of that reflects particular of light and transmits all others. This is achieved by creating a periodic variation in the of the fiber core, which generates a wavelength-specific.
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This paper gives a short introduction to FBG sensors, points out their special strengths and weaknesses and describes a measuring system which enables strain gages and FBGS to be measured simultaneously, providing all data processing functions originally developed. The work is devoted to the consideration of methods for determining the strain of objects using fiber Bragg gratings under a high-frequency vibration or pulsed mechanical action, which is difficult to perform using widespread methods and devices. A fiber Bragg grating is a small length of optical fiber that comprises a pattern of many reflection points that creates a reflection of particular wavelengths of incident light.
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An Optical Fiber Bragg Grating (FBG) is a periodic modulation of the refractive index within the core of an optical fiber. This structure acts as a wavelength-selective reflector, transmitting most wavelengths while reflecting a narrow band centered at the Bragg wavelength (λ B). It details their fabrication, typically using ultraviolet laser light and a phase mask, and. A variation of the period of the grating inscripted in a fiber optic – induced by mechanical or thermal perturbation – causes a shift of the reflected peak wavelength, due to the related optical path length variation.
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