Imaging spectroradiometer for the 8-12-num region with a 3-cm(-1) passband acousto-optic tunable filter.

An imaging spectroradiometer was built covering the 8-12-mum 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 degrees x 10 degrees , 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 SF(6)could be imaged at ambient temperatures.

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