Abstract
To meet the requirements for low-frequency vibration monitoring, a new type of FBG (fiber Bragg grating) accelerometer with a bended spring plate is proposed. Two symmetrical bended spring plates are used as elastic elements, which drive the FBG to produce axial strains equal in magnitude but opposite in direction when exciting vibrations exist, leading to doubling the wavelength shift of the FBG. The mechanics model and a numerical method are presented in this paper, with which the influence of the structural parameters on the sensitivity and the eigenfrequency are discussed. The test results show that the sensitivity of the accelerometer is more than 1000 pm/g when the frequency is within the 0.7–20 Hz range.
Highlights
IntroductionVibration measurement is an important and key issue in modern engineering applications
Vibration measurement is an important and key issue in modern engineering applications.Traditional accelerometers are usually the piezoelectric type and piezo-resistive type, etc. [1,2].these sensors, when applied on a large scale or applied in flammable explosive environments, can be affected by electromagnetic interference, and may even develop a risk of inflammation.To address these problems, the use of optical technology in the design of accelerometers is needed, in contrast to the traditional electronic ones [3].Over the last two decades, FBG-based accelerometers have attracted much more attention from both researchers and engineers
Great progress has been made in the design of FBG-based accelerometers, such as the embedded type and cantilevers [11,12,13,14,15], accelerometers based on a diaphragm [16,17]
Summary
Vibration measurement is an important and key issue in modern engineering applications. Over the last two decades, FBG (fiber Bragg grating)-based accelerometers have attracted much more attention from both researchers and engineers. Liu presented an FBG accelerometer based on a single diaphragm and on double diaphragms [16,17] The former had a broad frequency ranging from 10 to 200 Hz, but a low sensitivity. This paper, paper, aiming aiming to to monitor monitor low-frequency low-frequency vibrations, vibrations, demonstrates demonstratesa anew new type type of of FBG Asvibration elastic elements, spring plates play role in transforming vertical of the exciter the to the axial strain of an theimportant. Two ends of the fiber the vertical acceleration of the vibration exciter to the axial strain of the FBG. Counter-deformations in its axial direction which yields resultant double deformations due to the effect, doubling its sensitivity approximately
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