A new Fourier transform imaging spectrometer based on a focal plane birefringent interferometer (FPBI) is presented. The FPBI, located in front of the detector, is capable of performing spectral imaging measurements. It mainly consists of a birefringent plate and a birefringent wedge. The ordinary and extraordinary rays—with an optical path difference—are split by the FPBI and interfere on the focal plane. The spectral image of the target can be acquired via scene scanning and spectral recovery. The principle of interferometric imaging of the FPBI is investigated, and verification experiments are then performed. The experiments indicate that the FPBI not only provides effective spectral imaging measurements, but also presents the advantages of being ultra-compact and lightweight. As a result, it can be effectively applied in situations such as outdoor surveillance and airborne remote sensing.

中文翻译：

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使用焦平面双折射干涉仪的超紧凑傅里叶变换成像光谱仪

提出了一种基于焦平面双折射干涉仪（FPBI）的新型傅立叶变换成像光谱仪。位于探测器前面的FPBI能够执行光谱成像测量。它主要由双折射板和双折射楔组成。具有光程差的寻常光线和异常光线被FPBI分开，并在焦平面上发生干涉。可以通过场景扫描和光谱恢复来获取目标的光谱图像。研究了FPBI干涉成像的原理，然后进行了验证实验。实验表明，FPBI不仅可以提供有效的光谱成像测量，而且还具有超紧凑和轻巧的优点。因此，