Harvey Andrew, Fletcher-Holmes David
Opt Express. 2004 Nov 1;12(22):5368-74. doi: 10.1364/opex.12.005368.
Fourier-transform imaging spectrometers offer important advantages over other spectral imaging modalities, such as, a wider free spectral range, higher spectral resolutions and, in low-photon-flux conditions, higher signal-to-noise ratios can be achieved. Unfortunately, for application in harsh environments, deployment of Fourier-transform instruments based on traditional moving-mirror interferometers is problematic due to their inherent sensitivity to vibration. We describe a new Fourier-transform imaging spectrometer, based on a scanning birefringent interferometer. This system retains the advantages of traditional Fourier transform instruments, but is inherently compact and insensitive to vibration. Furthermore, the precision requirements of the movement can be relaxed by typically two orders of magnitude in comparison to a traditional two-beam interferometer. The instrument promises to enable application of Fourier-transform imaging spectrometry to applications, such as airborne reconnaissance and industrial inspection, for the first time. Example spectral images are presented.
傅里叶变换成像光谱仪相较于其他光谱成像方式具有重要优势，例如，自由光谱范围更宽、光谱分辨率更高，并且在低光子通量条件下能够实现更高的信噪比。不幸的是，对于在恶劣环境中的应用，基于传统动镜干涉仪的傅里叶变换仪器由于其对振动的固有敏感性而存在问题。我们描述了一种基于扫描双折射干涉仪的新型傅里叶变换成像光谱仪。该系统保留了传统傅里叶变换仪器的优势，但本质上结构紧凑且对振动不敏感。此外，与传统双光束干涉仪相比，运动的精度要求通常可以放宽两个数量级。该仪器有望首次使傅里叶变换成像光谱法应用于诸如机载侦察和工业检测等应用中。文中给出了示例光谱图像。
