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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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MALDI-TOF Mass Spectrometry01:19

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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.
Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

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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...
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Updated: Oct 21, 2025

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
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Recent Trends in Compressive Raman Spectroscopy Using DMD-Based Binary Detection.

Derya Cebeci1, Bharat R Mankani2, Dor Ben-Amotz3

  • 1PortMera Corp., Stony Brook, NY 11790, USA.

Journal of Imaging
|September 2, 2021
PubMed
Summary
This summary is machine-generated.

Compressive detection (CD) significantly speeds up hyperspectral Raman imaging by collecting data in a low-dimensional space. This approach enables real-time chemical imaging, overcoming the limitations of conventional methods.

Keywords:
ChemometricsRaman spectroscopychemical imagingcompressive detectiondigital light processor (DLP)digital micromirror device (DMD)multivariate data analysisoptimal binary filtersspatial light modulators (SLM)

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Area of Science:

  • Spectroscopy
  • Chemical Imaging
  • Data Science

Background:

  • Hyperspectral Raman imaging is crucial for chemical analysis but is limited by slow data acquisition.
  • Conventional methods can take hours to days for chemical image collection.
  • Compressive detection (CD) offers a solution by sensing and compressing spectral signals simultaneously.

Purpose of the Study:

  • To provide an overview of recent advancements in compressive Raman detection.
  • To discuss the performance validation of CD strategies.
  • To highlight the benefits of CD for accelerating hyperspectral data collection.

Main Methods:

  • Utilizing single-channel detectors with optical filter functions for component intensity measurement.
  • Employing optimized wavelength combinations characteristic of sample components.
  • Implementing a Digital Micromirror Device (DMD) based binary detection strategy for validation.

Main Results:

  • CD enables measurements in a low-dimensional space, focusing on relevant information.
  • This results in a significant increase in Raman data collection speed.
  • Compressive hyperspectral images are composed of 'score' pixels, representing component intensities.

Conclusions:

  • Compressive detection is a key strategy for achieving real-time hyperspectral Raman imaging.
  • CD overcomes the speed limitations of traditional hyperspectral imaging techniques.
  • Recent advances demonstrate the effectiveness and potential of CD in chemical imaging applications.