Compact Anamorphic Imaging Spectrometer

Published

February 9, 2007

Author(s)

P Maciejewski, K Barnard, Rand Swanson, Michael Kehoe, C Smith, Thomas Moon, Robert R. Bousquet, Steven W. Brown, Keith R. Lykke

Abstract

Deployment of compact hyperspectral imaging sensors on small UAVs has the potential of providing a cost-effective solution for rapid-response target detection and cueing based on time-critical spectral information collected at low altitudes. To address this goal, a new compact hyperspectral imaging sensor is being developed using a novel anamorphic optical system. This design concept benefits from a reduction in complexity over standard high-performance spectrometer optical designs while maintaining excellent aberration control and spatial and spectral distortion characteristics. The anamorphic optical system has the advantage over conventional push-broom hyperspectral imagers of partially decoupling image formation along both the spatial and spectral axes. The unique design removes the spectrometer slit focus along the spatial axis and in turn eliminates nearly all aberrations in the front-end optics of the system, regardless of field angle or aperture size. The optical system utilizes a standard manufacturable, flat diffraction grating for cost reduction. This paper is the first presentation of a prototype anamorphic imaging spectrometer designed for operation in the short-wave infrared (SWIR) spectral band over a wavelength range of 1.0 m to1.7 m, dictated by the uncooled InGaAs focal plane array used as the detector. A performance comparison between the anamorphic system and a standard state-of-the-art Offner spectrometer with comparable system requirements is presented. Results from a radiometric characterization of the SWIR anamorphic hyperspectral imaging sensor is also presented. Finally, methods and concepts for further weight reduction and options for extending the spectral range are addressed.

Proceedings Title

Proceedings of th MSS Parallel Symposium (Passive Sensors Area; Hyperspectral and Polarimetric Sensing Session) | 2007 | MSS|

Conference Dates

February 5-9, 2007

Conference Location

Undefined

Conference Title

MSS Parallel Symposium (Passive Sensors Area; Hyperspectral and Polarimetric Sensing Session)

Pub Type

Conferences

Keywords

calibration, hyperspectral, hyperspectral imaging, laser, radiometry, remote sensing, responsivity

Citation

Maciejewski, P. , Barnard, K. , Swanson, R. , Kehoe, M. , Smith, C. , Moon, T. , Bousquet, R. , Brown, S. and Lykke, K. (2007), Compact Anamorphic Imaging Spectrometer, Proceedings of th MSS Parallel Symposium (Passive Sensors Area; Hyperspectral and Polarimetric Sensing Session) | 2007 | MSS|, Undefined (Accessed April 19, 2024)