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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...

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Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy
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Particle size evaluations using multiwavelength extinction measurements.

E E Uthe

    Applied Optics
    |April 8, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study developed a lidar method for remote particle size evaluation of industrial emissions. A two-laser lidar system effectively estimates particle sizes up to 6 micrometers.

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    Area of Science:

    • Environmental Science
    • Atmospheric Science
    • Optical Engineering

    Background:

    • Accurate measurement of particulate matter size is crucial for environmental monitoring and industrial process control.
    • Remote sensing methods offer advantages for evaluating emissions from stationary sources.

    Purpose of the Study:

    • To develop and validate a lidar-based method for remote estimation of mean particle size in stationary source emissions.
    • To establish a foundational dataset correlating extinction coefficients with particle sizes for various aerosols.

    Main Methods:

    • Experimental data collection using a 10-m aerosol tunnel and multi-wavelength transmissometers.
    • Generation of aerosols including fly ash, silica, and other particulate materials across different size fractions.
    • Particle size characterization using multistage impactors and air permeability analysis.

    Main Results:

    • A single-laser lidar system at 1.06 and 0.53 micrometers effectively estimates particle sizes below 1 micrometer.
    • Extinction ratios approach unity for larger particles, necessitating longer wavelengths.
    • A two-laser lidar system (10.6 and 0.53 micrometers) can estimate mean particle sizes up to 6 micrometers.

    Conclusions:

    • Lidar technology shows promise for remote monitoring of particle size in industrial emissions.
    • Wavelength selection is critical for accurate particle size estimation across different size ranges.
    • Further development of multi-wavelength lidar systems can enhance remote sensing capabilities for aerosols.