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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

324
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...
324
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

297
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...
297
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

338
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
338
Emission Spectra02:39

Emission Spectra

51.0K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
51.0K
Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

382
There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
382
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

915
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...
915

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Natural Gas Analysis Using Polarized Raman Spectroscopy.

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Broadening of the ν<sub>2</sub> Raman Band of CH<sub>4</sub> by C<sub>3</sub>H<sub>8</sub> and C<sub>4</sub>H<sub>10</sub>.

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Raman Natural Gas Analyzer: Effects of Composition on Measurement Precision.

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Depolarization Ratio of the ν<sub>1</sub> Raman Band of Pure CH<sub>4</sub> and Perturbed by N<sub>2</sub> and CO<sub>2</sub>.

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Helium Detection in Natural Gas Using Raman Spectroscopy.

Aleksandr S Tanichev1, Dmitry V Petrov1,2

  • 1Laboratory of Ecological Instrumentation, Institute of Monitoring of Climatic and Ecological Systems, Tomsk, Russia.

Applied Spectroscopy
|October 9, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel Raman spectroscopy method to quantify helium in natural gas by analyzing methane spectral changes. This breakthrough allows for accurate helium detection, previously thought impossible with this technique.

Keywords:
Raman spectroscopyheliummethanenatural gaspressure broadeningpressure shiftν1 band

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Area of Science:

  • Spectroscopy
  • Analytical Chemistry
  • Natural Gas Analysis

Background:

  • Raman spectroscopy is a powerful tool for quantitative analysis of gas mixtures.
  • Helium, a key natural gas component, has historically been undetectable by Raman spectroscopy due to its lack of vibrational spectra.
  • Accurate quantification of helium in natural gas is crucial for various applications.

Purpose of the Study:

  • To demonstrate a novel approach for extracting helium content from Raman spectra of natural gas.
  • To validate the feasibility of detecting helium using Raman spectroscopy by analyzing its influence on methane.
  • To establish spectroscopic parameters for methane, helium, nitrogen, carbon dioxide, and ethane.

Main Methods:

  • Developed an approach based on analyzing alterations in the methane (CH4) ν1 band.
  • Obtained spectroscopic parameters characterizing the influence of CH4, He, N2, CO2, and C2H6 on the methane ν1 band.
  • Performed test measurements at a spectral resolution of 0.35 cm⁻¹ and sample pressure of 50 bar.

Main Results:

  • Successfully demonstrated the extraction of helium content from Raman spectra.
  • Achieved a measurement uncertainty of 1 mol% for helium in natural gas at 50 bar.
  • Showcased potential for increased precision to 0.01 mol% with high-resolution spectrometers.

Conclusions:

  • The developed method provides a new capability for helium quantification in natural gas using Raman spectroscopy.
  • This technique serves as a valuable addition to existing Raman gas analysis, potentially enabling all-in-one devices.
  • Further improvements to the approach are possible, enhancing its utility in natural gas analysis.