Compact snapshot real-time imaging spectrometer

Michael W. Kudenov; Eustace L. Dereniak

doi:10.1117/12.902722

5 October 2011 Compact snapshot real-time imaging spectrometer

Proceedings Volume 8186, Electro-Optical Remote Sensing, Photonic Technologies, and Applications V; 81860W (2011) https://doi.org/10.1117/12.902722
Event: SPIE Security + Defence, 2011, Prague, Czech Republic

Abstract

The described spectral imaging system, referred to as a Snapshot Hyperspectral Imaging Fourier Transform (SHIFT) spectrometer, is capable of acquiring spectral image data of a scene in a single integration of a camera, is ultra-compact, inexpensive (commercial off-the-shelf), has no moving parts, and can produce datacubes (x, y, λ) in real time. Based on the multiple-image FTS originally developed by A. Hirai [1], the presented device offers significant advantages over his original implementation. Namely, its birefringent nature results in a common-path interferometer which makes the spectrometer insensitive to vibration. Furthermore, it enables the potential of making the instrument ultra-compact, thereby improving the portability of the sensor. By combining a birefringent interferometer with a lenslet array, the entire spectrometer consumes approximately 15×15×20 mm³, excluding the imaging camera. The theory of the birefringent FTS is provided, followed by details of its specific embodiment and a laboratory proof of concept of the sensor. Post-processing is currently accomplished in Matlab, but progress is underway in developing real-time reconstruction capabilities with software programmed on a graphics processing unit (GPU). It is anticipated that processing of >30 datacubes per second can be achieved with modest GPU hardware, with spatial/spectral data of or exceeding 256×256 spatial resolution elements and 60 spectral bands over the visible (400-800 nm) spectrum. Data were collected outdoors, demonstrating the sensor's ability to resolve spectral signatures in standard outdoor lighting and environmental conditions as well as retinal imaging.

Citation Download Citation

Michael W. Kudenov and Eustace L. Dereniak "Compact snapshot real-time imaging spectrometer", Proc. SPIE 8186, Electro-Optical Remote Sensing, Photonic Technologies, and Applications V, 81860W (5 October 2011); https://doi.org/10.1117/12.902722

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