摘要
为满足光纤光栅传感系统的解调仪器高分辨力、微型化的需求,针对光纤光栅传感1 550 nm波段设计了光谱成像法光纤光栅解调系统的分光光路系统.成像系统形式采用交叉式Czerny-Turner结构,分析了使用超环面镜代替球面镜、在结构中加入额外的柱面透镜或柱面反射镜以及使衍射光栅工作在发散光条件下的3种校正像散方法的特点,最终选用使衍射光栅工作在发散光条件下的校正像散方法,实现在不加入附加光学元件条件下的像散校正,同时采用小角度入射的方法减小系统彗差.通过Zemax对成像系统进行了参数优化与光线追迹分析,优化结果证明了上述像差校正方法适用于光纤光栅解调.在解调光谱范围内,可明显分开波长间隔为1 nm的光斑,满足光纤光栅解调的分辨力需求.
To meet the requirements of high resolution and miniaturization, an optical system of FBG in-terrogator operating for sensing wavelength of 1550 nm was designed. The crossed Czerny-Turner optical imaging structure was employed as the FBG spectrum splitting system. Characteristics of three astigmatism correction methods were analyzed, namely, using a toroidal mirror instead of spherical mirror, adding an extra cylindrical lens or cylindrical mirror, and setting diffraction grating in divergent light. The astigma-tism correction method that set diffraction grating in divergent light was adopted. Besides, the incident angle was decreased to minimize the coma. The optimization and ray tracing for the spectral imaging sys-tem were performed with Zemax software. Result indicates that the aberration correction method is feasi-ble for FBG demodulation. The spots with interval of 1 nm can be distinguished well in demodulation wavelength band, satisfying the FBG demodulation resolution requirement.
出处
《纳米技术与精密工程》
CAS
CSCD
北大核心
2016年第3期211-216,共6页
Nanotechnology and Precision Engineering
基金
教育部"长江学者和创新团队"发展计划资助项目(IRT1212)
北京市科技计划资助项目(Z151100003615010)
