8 September 1995 Cross-dispersion infrared spectrometry (CDIRS) for remote chemical sensing
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The advent of high performance infrared detector arrays together with recent advances in coarse grating fabrication now makes possible the design and fabrication of infrared spectrometers that cover the mid-IR atmospheric windows at high resolution with no moving components. For applications involving small sources at large distances this instrument approach can provide a substantial increase in sensitivity over Fourier transform spectrometers at the same resolution and spectral coverage. We describe the design evolution of the LLNL cross dispersive infrared spectrometer (CDIRS) remote chemical sensors operating in the two atmospheric windows from 2.3 microns to 4.2 microns. The spectral and mechanical performance of the first generation 1 meter focal length prototype echelle grating spectrometer (EGS) is presented. A second generation cryogenic (150 K) spectrometer (mini-EGS) utilizes a high dispersion silicon immersion grating to provide a compact design. This instrument will be flown in the winter of 1995 as part of the instrumentation suite for the DOE airborne multisensor pod system (AMPS) effluent research program.
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Charles G. Stevens, Charles G. Stevens, Paul J. Kuzmenko, Paul J. Kuzmenko, William E. Conaway, William E. Conaway, Frank Magnotta, Frank Magnotta, Norman L. Thomas, Norman L. Thomas, Joseph J. Galkowski, Joseph J. Galkowski, Isabella T. Lewis, Isabella T. Lewis, Terry W. Alger, Terry W. Alger, } "Cross-dispersion infrared spectrometry (CDIRS) for remote chemical sensing", Proc. SPIE 2552, Infrared Technology XXI, (8 September 1995); doi: 10.1117/12.218228; https://doi.org/10.1117/12.218228

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