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Related Concept Videos

Deconvolution01:20

Deconvolution

Deconvolution, also known as inverse filtering, is the process of extracting the impulse response from known input and output signals. This technique is vital in scenarios where the system's characteristics are unknown, and they must be inferred from the observable signals.
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...

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Related Experiment Video

Updated: May 15, 2026

Terahertz Imaging and Characterization Protocol for Freshly Excised Breast Cancer Tumors
08:56

Terahertz Imaging and Characterization Protocol for Freshly Excised Breast Cancer Tumors

Published on: April 5, 2020

Terahertz deconvolution.

Gillian C Walker1, John W Bowen, Julien Labaune

  • 1School of Systems Engineering, University of Reading, Reading, UK. g.c.walker@reading.ac.uk

Optics Express
|December 25, 2012
PubMed
Summary
This summary is machine-generated.

A new deconvolution algorithm overcomes terahertz imaging resolution limits, enabling deep sub-wavelength depth resolution. This breakthrough allows detailed imaging of stratified materials, even revealing hidden sub-surface structures.

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

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Last Updated: May 15, 2026

Terahertz Imaging and Characterization Protocol for Freshly Excised Breast Cancer Tumors
08:56

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Published on: April 5, 2020

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Signal Processing

Background:

  • Terahertz pulsed reflection imaging and spectroscopy are valuable for non-destructive analysis of stratified materials.
  • Traditional terahertz imaging resolution is limited by the available pulse width, hindering detailed analysis of closely spaced layers.

Purpose of the Study:

  • To present a novel deconvolution algorithm to overcome the pulse width limitation in terahertz imaging.
  • To achieve deep sub-wavelength and sub-pulse width depth resolution for stratified samples.

Main Methods:

  • Theoretical investigation of the deconvolution algorithm.
  • Demonstration of signal reconstruction from boundaries in stratified materials.
  • Application of the deconvolution technique for sub-surface imaging.

Main Results:

  • The deconvolution algorithm successfully circumvents the traditional resolution limit.
  • Reconstruction of signals from unresolved boundaries in stratified materials was achieved.
  • Sub-surface imaging of a stratified sample, including the reverse side of paper, was successfully recreated.

Conclusions:

  • The developed deconvolution algorithm significantly enhances depth resolution in terahertz imaging.
  • This technique enables detailed characterization of stratified materials beyond conventional limits.
  • The method holds potential for advanced non-destructive testing and material analysis.