23 July 1997 Ultrahigh-speed chemical imaging spectrometer
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Abstract
A new type of imaging spectrometer is being developed for remote sensing and chemical detection. It is based on a rotary Fourier Transform Spectrometer design. The rotary nature of the scan allows both high speed operation and laserless sampling of the detector signal. Its small size also allows cryogenic operation for enhanced detection capability and stable calibration. A 360 scan per single pixel prototype was built and demonstrated at ERDEC in April 1996. The single scan time at this speed is just under 1 millisecond. The optical sensor measures 6' X 4' X 2', and weighs approximately 3 lbs. Spectral resolution is 2 wavenumbers (cm-1) maximum, and coverage is 12 - 14 microns using Zinc Selenide (ZnSe) optics. Power consumption is less than 1 watt at steady state, slightly more at spinup. Electronics and software package used COTS 12 bit, 10 MHz data acquisition and DSP board in conjunction with Labview software for acquisition and analysis on a desktop PC. Following this demonstration, the scan linearity was studied by passing a 3.3 micron laser signal through the IR channel using different rotor materials, and using laserless sampling to look at the resulting lineshape. The results of that testing is the subject of this paper. Subsequently, a 3 by 3 HgCdTe (MCT) detector array is being mated to the optical sensor. An enhanced data channel with 16 simultaneous 12 bit inputs is also being fitted, running at 1/10 of original speed. Image quality and pixel crosstalk are being analyzed at this lower speed. Field measurements will be made in summer 1997.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Winthrop Wadsworth, Winthrop Wadsworth, Jens-Peter Dybwad, Jens-Peter Dybwad, } "Ultrahigh-speed chemical imaging spectrometer", Proc. SPIE 3082, Electro-Optical Technology for Remote Chemical Detection and Identification II, (23 July 1997); doi: 10.1117/12.280925; https://doi.org/10.1117/12.280925
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