Abstract

An imaging spectroradiometer was built covering the 8–12-μm region with an acousto-optic tunable filter with a 3-cm^-1 passband, along with a commercial infrared camera. The system field of view was 7.5° × 10°, and the resolution was nearly diffraction limited. Real-time images were digitally recorded, and software was used to enhance the data and increase the camera temperature sensitivity to less than a millidegree Kelvin. The minimum discernible intensity was 10^-3 that of a globar source at 900 K, and emission from SF₆ could be imaged at ambient temperatures.

© 1998 Optical Society of America

MWIR thermal imaging spectrometer based on the acousto-optic tunable filter

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