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Related Concept Videos

Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

1.6K
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,...
1.6K
Gas Chromatography: Overview of Detectors01:13

Gas Chromatography: Overview of Detectors

2.0K
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...
2.0K
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

1.2K
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...
1.2K
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

1.7K
The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
1.7K
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

5.1K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
5.1K
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

1.3K
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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Related Experiment Video

Updated: Feb 5, 2026

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Mid-Infrared Trace CH4 Detector Based on TDLAS-WMS.

Shi-min Qu, Ming Wang, Nan Li

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
    |September 18, 2018
    PubMed
    Summary

    A new trace methane (CH4) detector uses tunable diode laser absorption spectroscopy (TDLAS) and wavelength modulation spectroscopy (WMS). This instrument achieves a minimum detection limit of 40×10-9 for accurate, non-contact methane sensing.

    Area of Science:

    • Environmental Science
    • Analytical Chemistry
    • Spectroscopy

    Background:

    • Accurate detection of trace methane (CH4) is crucial for environmental monitoring and industrial safety.
    • Non-contact sensing methods are desirable for real-time and remote methane detection.
    • Existing methods may face limitations in sensitivity, stability, or operational complexity.

    Purpose of the Study:

    • To design and develop a novel trace methane (CH4) detector.
    • To achieve high sensitivity and accuracy for non-contact methane detection.
    • To validate the feasibility and performance of the developed instrument.

    Main Methods:

    • Combined tunable diode laser absorption spectroscopy (TDLAS) and wavelength modulation spectroscopy (WMS) detection technologies.

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    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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    In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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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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  • Utilized a mid-infrared quantum cascade laser (QCL) targeting the CH4 absorption line at 1332.8 cm-1 (7.5 μm).
  • Employed a sealed Herriott cell with a 76 m optical path and a difference detection optical path to enhance signal-to-noise ratio.

    • Main Results:

    • Achieved a minimum detection limit of 40×10-9 for trace methane.
    • Demonstrated a relative error of 0.09% in test results.
    • Exhibited instrument stability better than 2.8%.

    Conclusions:

    • The developed trace CH4 detector, integrating TDLAS and WMS, is feasible for sensitive and accurate methane sensing.
    • The instrument's design, incorporating a long optical path and difference detection, effectively reduces noise and enhances detection capabilities.
    • The achieved performance metrics validate the instrument's potential for various applications requiring non-contact trace methane detection.