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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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...
Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

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

Gas Chromatography: Overview of Detectors

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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Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces
10:21

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Published on: July 26, 2016

Fiber-optic evanescent wave sensor for gas detection.

A Messica, A Greenstein, A Katzir

    Optics Letters
    |October 22, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A new fiber-optic sensor rapidly measures sulfur hexafluoride (SF6) gas pressure. This technology enables high-precision detection and identification of various gases.

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    Area of Science:

    • Optoelectronics
    • Chemical Sensing
    • Infrared Spectroscopy

    Background:

    • Fiber-optic sensors offer advantages in remote and harsh environment sensing.
    • Evanescent wave sensing utilizes light interaction with the surrounding medium.
    • Sulfur hexafluoride (SF6) is a potent greenhouse gas requiring accurate monitoring.

    Purpose of the Study:

    • To develop and demonstrate a novel fiber-optic evanescent wave sensor.
    • To enable rapid and precise measurement of sulfur hexafluoride (SF6) gas pressures.
    • To explore the potential for broad gas detection and identification.

    Main Methods:

    • Utilized a lead salt tunable infrared laser source.
    • Employed a multimode, uncladded silver halide infrared optic fiber.
    • Integrated the laser and fiber to create an evanescent wave sensing probe.

    Main Results:

    • Achieved rapid measurement of sulfur hexafluoride (SF6) pressures.
    • Demonstrated a few-percent detection limit for SF6.
    • Confirmed the sensor's capability for high-precision gas detection.

    Conclusions:

    • The novel fiber-optic evanescent wave sensor is effective for SF6 pressure measurement.
    • The sensor system shows promise for sensitive and selective detection of diverse gases.
    • This technology advances capabilities in environmental monitoring and industrial gas analysis.