【摘要】 提出了一种利用光纤Fabry-Perot(F-P)干涉结构的微位移传感器,该F-P干涉结构是由双倾斜光纤光栅(tilted fiber Bragg grating,TFBG)沿轴向错开一定距离构成空气腔形成的.入射光经双TFBG及其高反射端面往返传播,从而构成F-P干涉结构.光纤沿纵(z轴)向移动时,F-P腔的腔长发生变化,致使干涉光谱的自由光谱范围随之产生变化.实验验证,该传感器在0~115μm的测量范围内获得了高达0.475nm/μm的灵敏度,较之前提出的光纤光栅型传感器灵敏度提高了近3倍.更多还原

【Abstract】 A compact micro-displacement Fabry-Perot(F-P)sensor by the wavelength demodulation method was proposed,which was based on two tilted fiber Bragg gratings(TFBG)with an air cavity.The F-P interference was formed as the incident light transmitted through the dual TFBGs and its high reflective surface.The length of the air-cavity of the proposed F-P interferometer would change by moving one of the TFBGs along the axial direction,which would lead to changes of the wavelength spacing between two interferences spectral(free spectral range,FSR).Experimental results showed that the sensitivity of the sensor within the measurement range of 0to 115μm was about 0.475nm/μm,which was nearly 3times higher than that of the current paper reported.更多还原