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Related Concept Videos

Mass Spectrum01:23

Mass Spectrum

6.0K
A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
6.0K
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

1.5K
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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Gas Chromatography: Overview of Detectors01:13

Gas Chromatography: Overview of Detectors

2.6K
Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
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Related Experiment Video

Updated: Apr 14, 2026

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions
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Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

Published on: June 12, 2016

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[Research on a novel high-precision methane concentration detection system].

Lin-li Song, Han-chang Zhou, Zhi-jie Zhang

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
    |April 18, 2015
    PubMed
    Summary

    This study introduces a novel differential absorption optical structure and algorithm for accurate gas concentration detection using low-cost lasers. The method achieves high precision, comparable to expensive narrowband lasers, with a relative error below 2.0%.

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    Area of Science:

    • Spectroscopy
    • Optical Engineering
    • Laser Technology

    Context:

    • Gas concentration detection commonly relies on characteristic spectrum absorption methods.
    • High-precision detection often requires expensive narrowband modulated lasers, increasing system costs.
    • Existing portable, low-cost semiconductor lasers present an alternative for gas sensing.

    Purpose:

    • To develop a cost-effective gas concentration detection system using low-cost semiconductor lasers.
    • To design a conversion window differential absorption optical structure and a differential characteristic absorption ratio algorithm.
    • To achieve high detection accuracy comparable to systems using narrowband lasers.

    Summary:

    • A novel optical structure and algorithm were designed to improve gas concentration detection accuracy using low-cost semiconductor lasers.
    • The method combines a conversion window with an absorption gas chamber, calculating the ratio of light intensity to eliminate non-characteristic absorption.
    • Experiments with methane gas demonstrated a relative measurement error of less than 2.0% within the 200-5000 ppm range.

    Impact:

    • Enables high-precision gas concentration detection with affordable, portable semiconductor lasers.
    • Reduces the cost and system requirements for gas sensing applications.
    • Offers a stable and accurate method for monitoring gas concentrations, with proven experimental results.