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This novel, highdefinition technique represents the future of Mared chemical imaging analysis, a new discipline within the chemical and material sciences, which combines the capabilityof spectroscopyfor molecular analysiswith the power of visualization

Fourier transform spectroscopic imaging using an infrared focal-plane array detector.

ANALYTICAL CHEMISTRY, no. 19 (1995): 3377-3381

Cited: 281|Views329
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Abstract

A powerful new mid-infrared spectroscopic chemical imaging technique combining step-scan Fourier transform Michelson interferometry with indium antimonide focal-plane array (FPA) image detection is described. The coupling of an infrared focal-plane array detector to an interferometer provides an instrumental multiplex/multichannel advanta...More

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Introduction
  • Speci6caUy, the multiple detector elements enable spectra at all pixels to be collected simultaneously, while the interferometer portion of the system allows allthe spectralhquencies to be measured concurrently
  • With this method of mid-infrared spectroscopic imaging, the fidelity of the generated spectral images is limited only by the number of pixels on the FPA detector, and only several seconds of staring time is required for spectral image acquisition.
  • For example,functional groups can be visualized in complex substances through their intrinsic vibrational spectral signatures.’ Second, vibrational spectroscopic imaging is almost universally applicable because
Highlights
  • Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Malyland 20892, Department of Chemistty, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, and The Pmter and Gamble Company, Miami Valley Laboratories,Cincinnati, Ohio 45253-8707
  • Detector, and only several seconds of staring time is required for spectral image acquisition
  • This novel, highdefinition technique represents the future of Mared chemical imaging analysis, a new discipline within the chemical and material sciences, which combines the capabilityof spectroscopyfor molecular analysiswith the power of visualization
  • Chemical imaging is broadly applicable for noninvasive, molecular characterizationof heterogeneousmaterials, since all solid-state materials exhibit chemical nonuniformity that exists either by design or by developmentduringthe courseof material preparation or fabrication
  • Chemical imaging represents a new discipline that combines the analytical capabilities of spectroscopy with the ability to visualize the spatial distribution of a sample’s constituents
  • We describe an efficient technique for rapidly performing high-fidelity FT-IR imaging spectroscopy using an InSb focalplane array (FPA) detector coupled to an IR microscope and a stepscan FT-IR interferometer
Results
  • RESULTS AND DISCUSSION

    F i r e 2 describesthe imaging quality of the stepscanimaging system.
  • The infrared image in Fgure 2A is recorded at the zero path difference (ZPD) point of the stepscan interferometer mirror arms.
  • At ZPD, the maximum radiant power is incident on the InSb camera and represents the image frame exhibiting the highest image brightness.
Conclusion
  • CONCLUSIONS AND FUTURE DIRECTIONS

    The authors have demonstrated a powerful, new approach to highdewtion infrared chemical imagingthat combines the multiplexing power of interferometry performed in a stepscan mode with the multichannel characteristics of an indium antimonide focalplane array detector.
  • With the current state-of-the-art instrumentation, infrared chemical image analyses can be performed under almost real-time conditions.
  • It is anticipatedthat as detector readout and image storage hardware improve, infrared spectroscopic imaging can be performed with a continuous or rapid-scanning interferometer.
  • Most materials, manufactured or naturally occurring, either by design or by accident,are spatially and chemically heterogeneous.
  • Chemical imaging provides the means to simultaneouslyexplore both these properties, advancing the ability to better understand the molecular composition and architecture of complex materials
Reference
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