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Proceedings Paper

Performance and examples of measurements of a mid infrared interferometric hyperspectral imager
Author(s): Dario Cabib
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Paper Abstract

Spectral imagers rely mainly on two techniques for collection of spectral information: gratings and interferometers. The former type needs cooling of the optics to avoid background signals which significantly limit the dynamic range of the measurement. The latter type, in its present commercial configurations, is not suitable for pushbroom operation in an airborne situation. A recent spectral imager configuration based on a shearing interferometer has been shown to be suitable for pushbroom operation1,2 without the need for cooling the optics2,3. In a previous paper4 we have described the design of a new spectral imager for the 3-5 μ range, where the interferometer is a specially designed single prism. The advantages of this interferometer configuration are: i) compact optics, ii) high S/N ratio in the 3-5 μ range with small optical collection diameter, and iii) enhanced mechanical stability. The instrument has now been constructed and has been shown to perform very closely to the planned specifications. 320x240 pixels are in the image with a spectral resolution close to 50 cm-1 and an NESR (Noise Equivalent Spectral Radiance) of 2.5×10-9 W/(cm2.sr.cm-1). The spectrum is calibrated in units of Watt/(steradian.cm2.μ). If used in an airborne pushbroom mode it provides a swath width of 240 pixels in a ~6.9 degree transverse field of view. If used in a horizon scanning configuration, it has a vertical field of ~6.90 and a horizontal field up to 300 degrees. The IFOV is 0.5 milliradians. In this paper the major performance results and some examples of measurements are given.

Paper Details

Date Published: 2 October 2008
PDF: 7 pages
Proc. SPIE 7113, Electro-Optical and Infrared Systems: Technology and Applications V, 711310 (2 October 2008); doi: 10.1117/12.800093
Show Author Affiliations
Dario Cabib, CI Systems Ltd. (Israel)


Published in SPIE Proceedings Vol. 7113:
Electro-Optical and Infrared Systems: Technology and Applications V
David A. Huckridge; Reinhard R. Ebert, Editor(s)

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