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- W1968838611 abstract "An advanced infrared imaging spectroradiometer for hot targets (100 to 1500 C) has been designed to give real-time spectrally resolved images in the 2-5 micrometers band and to measure irradiances with high accuracy. A tripod-mounted off-axis afocal telescope with a 2.5 degree diagonal field of view directs the input radiation through a Tl3AsSe3 acousto-optic tunable filter (AOTF). The AOTF deflects away from the main beam a narrow spectral bandwidth beam with its central wavelength determined by the acoustic frequency of the AOTF. The AOTF is electronically controlled and can change the wavelength of the deflected beam within approximately 25 microsecond(s) to any other wavelength. The deflected beam is focused onto an 128 X 128 InSb focal plane array which has a frame rate electronically adjustable from 1 to 217 frame/s. With this versatility: 1) key wavelength discriminators of potential targets can be rapidly accessed, 2) the signal-to-noise ration can be improved by increasing the integration time for point targets, and 3) detector saturation can be avoided by reducing the integration time and AOTF diffraction efficiency for very hot targets. Calculations indicate that irradiance measurement errors should usually be less than 1% and often less than 0.1%.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only." @default.
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- W1968838611 date "1995-06-12" @default.
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- W1968838611 title "Infrared spectroradiometer design based on an acousto-optic tunable filter" @default.
- W1968838611 doi "https://doi.org/10.1117/12.210889" @default.
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