Multioctave spectral imaging in the infrared: a newly emerging approach

Paul D. LeVan; Tanya Diana Maestas

doi:10.1117/12.453363

17 January 2002 Multioctave spectral imaging in the infrared: a newly emerging approach

Paul D. LeVan, Tanya Diana Maestas

Proceedings Volume 4480, Imaging Spectrometry VII; (2002) https://doi.org/10.1117/12.453363
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

A new approach is described for obtaining spectral imagery over a broad range of infrared wavelengths, with high efficiency, and with a single grating element and focal plane array. The approach represents a simplification and mass reduction over the traditional approach involving multiple focal plane arrays, dispersing elements, and optical beamsplitters. The new approach has significant advantages for space-based hyperspectral imagers operating in the infrared over a broad range of wavelengths (e.g., MWIR & LWIR), where the reduction in cryo-cooled mass relative to the multi-channel approach translates into noteworthy savings in cryo-cooling requirements and launch costs. Overlapping grating orders are focused onto a multi-waveband focal plane array in order to create spectral images of a scene simultaneously in multiple wavelength regions. The blaze of the grating is chosen so that all spectral orders are dispersed with high grating efficiency. Such an approach extends the spectral range of dispersive spectrometers to several octaves of wavelength, while preserving the compact packaging and cryogenic requirements of conventional (one octave) instruments. We conclude with a description of a ground-based demonstration of a dual-octave embodiment of the concept.

Citation Download Citation

Paul D. LeVan and Tanya Diana Maestas "Multioctave spectral imaging in the infrared: a newly emerging approach", Proc. SPIE 4480, Imaging Spectrometry VII, (17 January 2002); https://doi.org/10.1117/12.453363

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KEYWORDS

Staring arrays

Spectrometers

Long wavelength infrared

Mid-IR

Signal to noise ratio

Infrared radiation

Imaging spectroscopy

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