Research on Vibration Sensing of Military Vehicles Based on Fiber Bragg Grating"Piston"Packaging
A highly reliable vibration sensor for military vehicles based on the"piston"packaging of fiber Bragg grating(FBG)is proposed.The FBG is connected to the cylindrical oscillator and fixed to the upper and lower surfaces of the cylindrical shell.The diameter of the cylindrical oscillator is slightly smaller than the inner diameter of the cylindrical shell.Under the excitation of external vibra-tion signals,the oscillator drives the FBG to perform a"piston"reciprocating motion inside the cylin-drical housing,thereby modulating the axial strain of the FBG.Based on the"piston"packaging mode,the oscillator is constrained within the housing,the mechanical stability of the sensor is improved and the measurement errors caused by the vibrations in other directions are avoided.The experimental re-sults show that the sensitivity of the sensor is 48.2 pm/g in the vibration acceleration range of 0.1 g to 0.7 g.The vibration signal under the road condition in vehicle test is relatively stable,with a maximum acceleration of±0.2 g.The vibration signal components under the riverbed road condition vehicle test are more complex,with a maximum vibration acceleration of about±0.4 g.The experimental results of vehicle tests and simulated shooting impacts under different road conditions are consistent with those of the road environment.
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