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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
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...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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.
The atomizer used in AAS can be either a flame atomizer or an...

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Related Experiment Video

Updated: May 30, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

Improved multiple-pass Raman spectrometer.

Utsav KC1, Joel A Silver, David C Hovde

  • 1Aerospace Engineering & Engineering Mechanics, The University of Texas at Austin, 1 University Station, C0600, Austin, Texas 78712, USA.

Applied Optics
|August 23, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces an improved Raman gain spectrometer for flame analysis. The new instrument enhances signal intensity and signal-to-noise ratio, enabling accurate gas temperature and species concentration measurements in flames.

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Area of Science:

  • Spectroscopy
  • Combustion diagnostics
  • Laser-based measurements

Background:

  • Accurate measurement of gas temperature and species concentration in flames is crucial for combustion research.
  • Traditional methods may face limitations in accuracy and real-time monitoring.
  • Raman spectroscopy offers a non-intrusive approach for in-situ combustion analysis.

Purpose of the Study:

  • To develop and validate an improved Raman gain spectrometer for enhanced flame measurements.
  • To increase the Raman signal intensity and signal-to-noise ratio (SNR) for more precise diagnostics.
  • To enable accurate determination of gas temperature and species concentrations in flames.

Main Methods:

  • Utilized a multiple-pass optical cell to significantly enhance incident light intensity.
  • Employed a spectrograph with a transmission grating and a fast gated CCD array detector.
  • Recorded spontaneous Raman spectra of N(2), CO(2), O(2), and CO in a methane-air flame.
  • Applied curve fitting of Raman spectra to simulations for temperature and species analysis.

Main Results:

  • Achieved an 83-fold increase in Raman signal compared to a single-pass configuration.
  • Demonstrated a 9.3-fold improvement in SNR for room-temperature air measurements.
  • Observed even higher SNR improvements in atmospheric pressure flames due to reduced detector noise impact.
  • Measured flame temperatures showed good agreement with radiation-corrected thermocouple data.

Conclusions:

  • The improved Raman gain spectrometer provides significantly enhanced signal and SNR for flame diagnostics.
  • The instrument is capable of accurately measuring gas temperature and species concentrations in flames.
  • This advancement offers a valuable tool for combustion research and diagnostics.