Abstract
We demonstrate a fiber Bragg grating (FBG)-based oscillator-accelerometer in which the acceleration sensitivity can be tuned by controlling the location of the mass oscillator. We theoretically and experimentally investigated the performance of the proposed accelerometer. Theoretical analysis showed that both the mass and location of the oscillator affect the sensitivity and resonant frequency of the accelerometer. To simplify the analysis, a nondimensional parameter, P, was introduced to tune the sensitivity of the FBG-based oscillator-accelerometer, which is related to the location of the mass oscillator. Numerical analysis showed that the accelerometer sensitivity is linearly proportional to the P parameter. In the experiment, six FBG-based oscillator-accelerometers with different P parameters (0.125, 0.25, 0.375, 0.5, 0.625, 0.75) were fabricated and tested. The experimental results agree very well with the numerical analysis, in which the sensitivity of the proposed accelerometer linearly increased with the increase in parameter P (7.6 pm/g, 15.8 pm/g, 19.3 pm/g, 25.4 pm/g, 30.6 pm/g, 35.7 pm/g). The resonance frequency is quadratically proportional to parameter P, and the resonance frequency reaches the minimum of 440 Hz when P is equal to 0.5. The proposed oscillator-accelerometer showed very good orthogonal vibration isolation.
Highlights
Vibration is a common phenomenon in the universe and generally includes macroscopic vibrations and microscopic vibrations
There are many new types of optical fiber accelerometers that have been proposed, which consist of Michelson interferometers [10], Fabry–Perot interferometers [11], fiber lasers [12] and fiber Bragg gratings [13,14,15,16,17,18,19,20,21,22,23,24]
Li et al [20] proposed an fiber Bragg grating (FBG)-based accelerometer with a diaphragm structure, which had tern-shape metallic shell with two FBGs has been reported, which had a r a sensitivity of 20.189 pm/g and a resonant frequency of 600 Hz
Summary
Vibration is a common phenomenon in the universe and generally includes macroscopic vibrations (such as earthquakes, tsunamis [1,2]) and microscopic vibrations (thermal motion of elementary particles, Brownian motion [3]). W presented an FBG-based 2D vibration sensor in which the sensitivity resides measurements including structural health monitoring [14] of civil engineering [15] and. Li et al [20] proposed an FBG-based accelerometer with a diaphragm structure, which had tern-shape metallic shell with two FBGs has been reported, which had a r a sensitivity of 20.189 pm/g and a resonant frequency of 600 Hz. Guo et al [21] designed quency of 1175. A special lantern-shape shell with two FBGs been reported, whichand had flexible a sensitivity, in whichmetallic the sensor structure hashas a simple, low-cost resonance frequency of. We demonstrate an FBG-based oscillator-accelerometer with a tunable sensitivity, in which the sensor hasof a simple, low-costAccelerometer and flexible measurement
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