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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Related Experiment Video

Updated: Jun 24, 2026

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
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Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging

Published on: April 28, 2022

Video rate spectral imaging using a coded aperture snapshot spectral imager.

Ashwin A Wagadarikar1, Nikos P Pitsianis, Xiaobai Sun

  • 1Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA.

Optics Express
|April 15, 2009
PubMed
Summary

Coded aperture snapshot spectral imagers (CASSI) now capture dynamic spectral scenes at video rates. Advances in optics and a new algorithm enable real-time 3D spectral data cube reconstruction for high-speed imaging.

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Area of Science:

  • Optics and Photonics
  • Image Processing
  • Spectroscopy

Background:

  • Coded aperture snapshot spectral imagers (CASSI) enable snapshot spectral imaging.
  • Previous CASSI systems had limitations in capturing dynamic scenes at high frame rates.

Purpose of the Study:

  • To advance CASSI technology for high-speed spectral imaging of dynamic scenes.
  • To improve optical design, calibration, and reconstruction algorithms for video-rate spectral imaging.

Main Methods:

  • Developed a new in-line, direct view optical system using a double Amici prism.
  • Implemented advanced system calibration procedures.
  • Introduced the NeAREst algorithm for reconstructing 3D spatio-spectral data cubes from compressed measurements.

Main Results:

  • Achieved substantial improvements in image quality through the new optical design.
  • Successfully demonstrated spectral video imaging of dynamic scenes at 30 frames per second.
  • Captured high-fidelity spectral image videos of multi-colored candles with live flames.

Conclusions:

  • CASSI technology is now capable of real-time spectral imaging of dynamic events.
  • The enhanced optical system and NeAREst algorithm significantly improve spatio-spectral data acquisition and reconstruction.
  • This advancement opens new possibilities for high-speed spectral analysis in various fields.