光谱分辨率可调的新型干涉成像光谱技术研究

摘要

针对色散型和静态干涉型成像光谱仪光谱分辨率固定、系统效能得不到充分发挥等问题,提出了一种光谱分辨率可调的静态双折射干涉成像光谱技术.该技术的创新点之一在于,仪器的光谱分辨能力可调,且调节范围较宽.对于不同的探测目标,利用这一技术,只获取有用的光谱数据,既能满足多目标、多任务光谱图像探测的需要,又可大幅减少对存储空间和通信带宽的占用,有效缩短数据处理时间,提高系统信噪比,从而使仪器总体性能达到最优.本文给出了新技术的具体实现方案及理论模型,对核心元件—横向剪切量可调的新型双Wollaston平行平板分束器进行了光线追迹,给出了其横向剪切量的精确理论计算公式,深入分析了其分光及横向剪切量调节原理.在此基础上,研究了新技术的光谱分辨率调节特性,给出了其光谱调节范围,并对其光谱调节原理进行了实验验证.%Existing static dispersive and interference imaging spectrometers use fixed spectral resolution to obtain a fixed spectral data cube. To satisfy a variety of application requirements, the spectral range must be large and the resolution must be fine. This will result in a huge data and reducing the S/N ratio of the instruments. To solve these problems, a novel birefringent Fourier transform imaging spectrometer with spectral zooming capability is proposed. Operating concept, theory and experimental demonstration are presented to validate that the designed setup has wide spectral zooming capability. It can adapt to different applications, significantly reduce the size of the imaging spectral data for capturing, saving and processing. This will effectively improve the system performance.