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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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IR Spectrometers01:25

IR Spectrometers

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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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Atomic Absorption Spectroscopy: Instrumentation01:22

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Applications of IR Spectroscopy: Overview01:11

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Related Experiment Video

Updated: May 5, 2026

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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A robust model transfer approach for portable Raman spectrometers: Enabling interoperable analysis across measurement

Yuting Li1, Zilong Wang1, Pei Liang1

  • 1College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 3, 2026
PubMed
Summary

This study introduces a new method to align Raman spectra from different instruments, ensuring accurate on-site analysis. The technique harmonizes spectral data, improving reliability for handheld Raman spectroscopy applications.

Keywords:
Cross-instrument calibrationModel transferRaman spectroscopyStandard materialsWavenumber alignment

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Handheld Raman spectroscopy enables rapid, on-site analysis but suffers from instrument-to-instrument spectral discrepancies.
  • These nonlinear variations hinder data comparability and limit the integration of diverse handheld Raman systems.
  • Accurate spectral alignment is crucial for reliable cross-platform analysis.

Purpose of the Study:

  • To develop a standard-material-based model transfer approach for aligning handheld Raman spectra with benchtop microscopic Raman instruments.
  • To establish a high-fidelity mapping correcting nonlinear wavenumber shifts while preserving spectral features.
  • To enhance cross-instrument reliability and enable interoperable analysis.

Main Methods:

  • Utilized a standard-material-based model transfer approach.
  • Integrated wavenumber calibration, multiscale convolution, and an attention-guided segmented transfer strategy.
  • Mapped handheld spectra to microscopic Raman reference profiles.

Main Results:

  • Successfully corrected nonlinear wavenumber shifts and preserved key spectral features (peak positions, intensities, shape).
  • Significantly reduced peak position root-mean-square error (RMSE) across various analytes.
  • Enhanced spectral similarity metrics (SAM, DTW, MMD) and improved downstream classification task performance.

Conclusions:

  • The proposed framework provides a robust solution for spectral consistency across Raman platforms.
  • Achieved enhanced cross-instrument reliability, supporting interoperable analysis in different environments.
  • Laid the foundation for multi-instrument spectral harmonization in Raman spectroscopy.