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

摘要

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 SF↓(6) could be imaged at ambient temperatures. # 1998 Optical Society of America OCIS codes: 120.0120, 110.3080, 120.0280, 160.1050, 230.1040, 300.1030.