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Waveform reconstruction for an ultrasonic fiber Bragg grating sensor demodulated by an erbium fiber laser

机译:fiber光纤激光器解调的光纤布拉格光栅传感器的波形重构

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Fiber Bragg grating (FBG) demodulated by an erbium fiber laser (EFL) has been used for ultrasonic detection recently. However, due to the inherent relaxation oscillation (RO) of the EFL, the detected ultrasonic signals have large deformations, especially in the low-frequency range. We proposed a novel data processing method to reconstruct an actual ultrasonic waveform. The noise spectrum was smoothed first; the actual ultrasonic spectrum was then obtained by deconvolution in order to mitigate the influence of the RO of the EFL. We proved by experiment that this waveform reconstruction method has high precision, and demonstrated that the FBG sensor demodulated by the EFL will have large practical applications in nondestructive testing. (C) 2015 Optical Society of America
机译:由an光纤激光器(EFL)解调的光纤布拉格光栅(FBG)最近已用于超声检测。但是,由于EFL固有的弛豫振荡(RO),检测到的超声信号会产生较大的变形,尤其是在低频范围内。我们提出了一种新颖的数据处理方法来重建实际的超声波波形。噪声频谱首先被平滑;然后通过反卷积获得实际的超声光谱,以减轻EFL RO的影响。实验证明,该波形重构方法具有较高的精度,并证明了EFL解调后的FBG传感器在无损检测中具有较大的实际应用价值。 (C)2015年美国眼镜学会

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