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Title: Novel active fiber Bragg grating sensor system for monitoring mechanical vibration in real-time
Authors: Yu, Y
Geng, S
Tam, H 
Keywords: Cantilever beam
Fiber Bragg grating
Fiber laser
Linear cavity
Mechanical vibration
Sensor technique
Issue Date: 2003
Publisher: 中国光学学会
Source: 光学学报 (Acta Optica Sinica), 2003, v. 23, no. 3, p. 293-296 How to cite?
Journal: 光学学报 (Acta Optica Sinica) 
Abstract: A pair of fiber Bragg gratings with the wavelengths of 1562.11 nm and 1562.71 nm, respectively, are used as the end reflectors of a constructed linear cavity fiber laser. They are epoxied onto the upper and lower surfaces of an employed uniform density and thickness isosceles triangle cantilever beam axially. As a strain agent, the beam makes the wavelength-shifts of both gratings be changeable, and therefore lead the laser producing pulses. The real-time measurements of the frequency of the mechanical vibration applied on the free end of the beam are demonstrated by observing the pulses. Within the range of 0-6.1 mm, the amplitude of the vibration can be estimated by observing the wavelength-shift-difference between two gratings. The measured results have been demonstrated to be in good agreement with the actual values under the frequency of 100 Hz.
ISSN: 0253-2239
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