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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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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...
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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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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

Raman Spectroscopy: Overview

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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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Related Experiment Video

Updated: Mar 20, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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[The Trace Methane Sensor Based on TDLAS-WMS].

Yang Liu, Jia-nan Wu, Mei-mei Chen

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
    |May 28, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a novel trace methane gas sensor combining tunable diode laser absorption spectroscopy (TDLAS) and wavelength modulation spectroscopy (WMS). The developed sensor achieves a minimum detection limit of 1.4 μmol/mol for critical methane monitoring.

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    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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    Area of Science:

    • Gas Spectroscopy
    • Laser-based Sensing
    • Environmental Monitoring

    Context:

    • Methane poses significant security risks in coal mining and contributes to climate change.
    • Accurate and sensitive methane monitoring is crucial for safety and environmental protection.
    • Existing monitoring technologies face limitations in sensitivity and specificity.

    Purpose:

    • To design and develop a highly sensitive trace methane gas sensor.
    • To leverage tunable diode laser absorption spectroscopy (TDLAS) and wavelength modulation spectroscopy (WMS).
    • To achieve a low detection limit for methane in various applications.

    Summary:

    • A trace methane sensor was developed using TDLAS and WMS, targeting the methane R(3) absorption branch.
    • The sensor utilizes a distributed feedback (DFB) laser tuned to 1.654 μm and a 76 m Herriott cell.
    • The system extracts second harmonic signals, achieving a minimum detection limit of 1.4 μmol/mol with minimal noise interference.

    Impact:

    • Enables enhanced safety in coal mining operations through early methane leak detection.
    • Provides a tool for more accurate greenhouse gas emission monitoring.
    • Offers a robust and sensitive method for trace gas analysis.