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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...
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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Reversible optical waveguide sensor for ammonia vapors.

J F Giuliani, H Wohltjen, N L Jarvis

    Optics Letters
    |August 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel optical waveguide sensor using a dye-coated capillary tube. This device can reliably detect ammonia vapor concentrations, paving the way for new sensing technologies.

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    Fast and Accurate Exhaled Breath Ammonia Measurement
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    Published on: June 11, 2014

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    Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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    Published on: March 22, 2019

    Fast and Accurate Exhaled Breath Ammonia Measurement
    06:27

    Fast and Accurate Exhaled Breath Ammonia Measurement

    Published on: June 11, 2014

    Area of Science:

    • Chemical sensing
    • Optical waveguide devices
    • Materials science

    Background:

    • Optical waveguide devices offer sensitive detection methods.
    • Dye-based sensors are being explored for gas detection.
    • Ammonia vapor sensing is critical in environmental and industrial monitoring.

    Purpose of the Study:

    • To develop a novel optical waveguide device for sensing ammonia vapors.
    • To investigate the reversibility and reproducibility of the sensor.
    • To propose a kinetic model for the vapor-film interaction.

    Main Methods:

    • Fabrication of a multiple-reflecting optical waveguide device using a glass capillary tube.
    • Coating the capillary with an oxazine perchlorate dye film.
    • Exposure of the device to varying concentrations of ammonia vapor.
    • Monitoring changes in optical properties for detection.

    Main Results:

    • The device successfully and reproducibly detected ammonia vapor concentrations ranging from 1000 ppm down to below 60 ppm.
    • The sensing mechanism demonstrated reversibility.
    • A preliminary qualitative kinetic model was proposed.

    Conclusions:

    • The developed optical waveguide device is a promising platform for sensitive and reversible ammonia vapor detection.
    • The dye-coated capillary sensor offers a cost-effective and efficient sensing solution.
    • Further kinetic studies can refine the understanding of the sensing mechanism.