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Related Concept Videos

Flame Photometry: Overview01:02

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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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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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Passive remote smoke plume opacity sensing: a technique.

P Lilienfeld, G Woker, R Stern

    Applied Optics
    |March 24, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel passive remote sensing technique measures smoke plume opacity by analyzing polarized skylight attenuation. This method accurately quantifies visual opacity, independent of plume brightness or scattered light effects.

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    Area of Science:

    • Environmental monitoring
    • Optical remote sensing
    • Atmospheric physics

    Background:

    • Accurate measurement of industrial emissions is crucial for environmental protection.
    • Existing methods for plume opacity assessment can be complex or limited in scope.
    • Remote sensing offers a non-intrusive approach to monitoring industrial plumes.

    Purpose of the Study:

    • To present a new passive technique for remote measurement of visual plume opacity.
    • To develop a method that is independent of plume brightness and scattered light.
    • To validate the technique through field testing.

    Main Methods:

    • Utilizing the attenuation of polarized Rayleigh-scattered skylight.
    • Employing a two-color difference measurement of skylight polarization.
    • Comparing measurements through the plume with adjacent unattenuated skylight.

    Main Results:

    • The technique successfully measures visual opacity of smoke plumes remotely.
    • The method is independent of intrinsic plume brightness and white-light polarization effects.
    • A prototype instrument demonstrated successful field testing on various sources.

    Conclusions:

    • The developed passive technique provides a reliable method for remote plume opacity assessment.
    • This approach offers advantages in simplicity and independence from interfering light sources.
    • Further application of this technology can enhance industrial emission monitoring.