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分析并实验研究了一种基于机械感生长周期光纤光栅(MLPFG)解调的新型光纤Bragg光栅(FBG)振动传感系统。利用机械线加工技术(MLPT)为制作周期为600μm、长为60mm的不锈钢槽板,采用机械感生法写制了中心波长1539.820nm、谐振线性边带大于6nm的MLPFG作为滤波器。选用中心波长为1542.400nm、3dB带宽为0.3nm的FBG设计振动传感器,通过附加电磁阻尼提高了稳定性,扩大了无失真频率测量范围。实验表明,该振动传感系统具有良好的动态响应特性,响应频谱与激振信号完全吻合,频率测量范围为10～3×103kHz,并具有良好的冲击振动响应。
A novel fiber Bragg grating (FBG) vibration sensing system based on the demodulation of mechanosensitive growth period fiber grating (MLPFG) is analyzed and experimentally studied. MLPT was used to fabricate a stainless steel slot plate with 600μm length and 60mm length. MLPFG with center wavelength of 1539.820nm and resonant linear sideband of more than 6nm was used as a filter by mechanical induction method. The FBG designed vibration sensor with the center wavelength of 1542.400nm and the 3dB bandwidth of 0.3nm is used to improve the stability by adding the electromagnetic damping and enlarge the measuring range of the distortion-free frequency. Experiments show that the vibration sensor system has a good dynamic response characteristics, the response spectrum and the excitation signal exactly match the frequency measurement range of 10 ~ 3 × 103kHz, and has a good shock vibration response.