Hadamard spectrometer for passive LWIR standoff surveillance

Roman V. Kruzelecky; Brian Wong; Jing Zou; Najeeb Mohammad; Wes Jamroz; Mohammed Soltani; Mohamed Chaker; Emile Haddad; Philips Laou; Suzanne Paradis

doi:10.1117/12.778911

30 October 2007 Hadamard spectrometer for passive LWIR standoff surveillance

Roman V. Kruzelecky, Brian Wong, Jing Zou, Najeeb Mohammad, Wes Jamroz, Mohammed Soltani, Mohamed Chaker, Emile Haddad, Philips Laou, Suzanne Paradis

Author Affiliations +

Proceedings Volume 6796, Photonics North 2007; 67962I (2007) https://doi.org/10.1117/12.778911
Event: Photonics North 2007, 2007, Ottawa, Canada

Abstract

Based on the principle of the Integrated Optical Spectrometer (IOSPEC), a waveguide-based, longwave infrared (LWIR) dispersive spectrometer with multiple input slits for Hadamard spectroscopy was designed and built intended for passive standoff chemical agent detection in 8 to 12μm spectral range. This prototype unit equips with a three-inch input telescope providing a field-of-view of 1.2 degrees, a 16-microslit array (each slit 60 μm by 1.8 mm) module for Hadamard binary coding, a 2-mm core ZnS/ZnSe/ZnS slab waveguide with a 2 by 2 mm² optical input and micro-machined integrated optical output condensor, a Si micro-machined blazing grating, a customized 128-pixel LWIR mercury-cadmium-telluride (MCT) LN2 cooled detector array, proprietary signal processing technique, software and electronics. According to the current configuration, it was estimated that the total system weight to be ~4 kg, spectral resolution <4cm^-1 and Noise Equivalent Spectral Radiance (NESR) <10^-8 Wcm^-2 sr^-1cm^-1 in 8 to 12 μm. System design and preliminary test results of some components will be presented. Upon the arrival of the MCT detector array, the prototype unit will be further tested and its performance validated in fall of 2007.

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Roman V. Kruzelecky, Brian Wong, Jing Zou, Najeeb Mohammad, Wes Jamroz, Mohammed Soltani, Mohamed Chaker, Emile Haddad, Philips Laou, and Suzanne Paradis "Hadamard spectrometer for passive LWIR standoff surveillance", Proc. SPIE 6796, Photonics North 2007, 67962I (30 October 2007); https://doi.org/10.1117/12.778911

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