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Related Concept Videos

¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
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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

Performance comparison of aperture codes for multimodal, multiplex spectroscopy.

Ashwin A Wagadarikar1, Michael E Gehm, David J Brady

  • 1Duke University Fitzpatrick Institute for Photonics, Box 90291, Durham, North Carolina 27708, USA.

Applied Optics
|August 7, 2007
PubMed
Summary

We tested different coded aperture spectrometer codes. S-matrix codes offer the highest signal-to-noise ratio (SNR), while Hadamard codes are most robust against detector misalignment.

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A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Area of Science:

  • Spectroscopy
  • Optical Engineering
  • Signal Processing

Background:

  • Coded aperture spectrometers offer enhanced sensitivity compared to traditional slit designs.
  • Evaluating performance of various static independent column codes is crucial for optimizing spectrometer design.
  • Signal-to-noise ratio (SNR) is a key metric for spectral reconstruction quality.

Purpose of the Study:

  • To experimentally compare the performance of diverse static independent column codes in a coded aperture spectrometer.
  • To assess the impact of subpixel vertical misalignments on spectral reconstruction quality.
  • To identify codes that maximize SNR and minimize sensitivity to detector misalignments.

Main Methods:

  • Experimental evaluation of multiple static independent column codes within a coded aperture spectrometer.
  • Performance assessment based on signal-to-noise ratio (SNR) as a function of subpixel vertical misalignments.
  • Comparison of spectral reconstruction quality across different code families.

Main Results:

  • S-matrix-based codes yielded spectral reconstructions with the highest SNR.
  • Hadamard-matrix-based codes demonstrated the least sensitivity to vertical subpixel misalignments.
  • The study confirmed the increased sensitivity of coded aperture spectrometers over slit designs.

Conclusions:

  • S-matrix codes are optimal for maximizing SNR in coded aperture spectrometers.
  • Hadamard codes provide superior robustness against detector misalignments, crucial for practical applications.
  • Coded aperture technology significantly enhances spectrometer sensitivity.