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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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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).
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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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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Light Scattering Intensity Field Imaging Sensor for In Situ Aerosol Analysis.

Ang Chen1, Shu Wang1, Youjiang Liu2

  • 1School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan 430074, China.

ACS Sensors
|July 2, 2020
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Summary
This summary is machine-generated.

A novel optical sensing method accurately measures aerosol particle size distribution using light scattering intensity fields. This portable, low-cost sensor offers a promising solution for real-time field measurements.

Keywords:
aerosol sensinglight scattering intensity fieldminiaturized sensoroptic imagingparticle size

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Area of Science:

  • Atmospheric chemistry and physics
  • Fuel combustion
  • Human health
  • Optical sensing technology

Background:

  • Aerosols are crucial in diverse scientific fields, impacting atmospheric conditions, combustion processes, and human health.
  • Existing particle sizing instruments are often bulky, expensive, or lack the necessary measurement channels for accurate size distribution analysis.
  • There is a need for portable, cost-effective, and accurate aerosol characterization tools for field applications.

Purpose of the Study:

  • To develop and validate a novel optical sensing method for analyzing aerosol particle size distribution.
  • To design a portable and low-cost prototype sensor based on the proposed method.
  • To assess the accuracy and potential of the developed sensor for routine field measurements.

Main Methods:

  • Utilizing the light scattering intensity field (LSIF), which captures scattered light in all directions around particles.
  • Employing the Tikhonov regularization algorithm to retrieve particle size distribution from LSIF data.
  • Designing a prototype sensor that collects LSIF using a parabolic reflector and projects it onto an image sensor via telecentric lenses.

Main Results:

  • The proposed optical sensing method effectively analyzes aerosol particle size distribution.
  • Experimental tests with di-ethyl-hexyl-sebacate aerosols demonstrated a relative measurement error within ±10% for the LSIF.
  • The developed prototype sensor integrates a cost-effective and portable design.

Conclusions:

  • The developed optical sensing method and prototype sensor provide an accurate and efficient means for aerosol particle size distribution analysis.
  • The system's portability, low cost, and demonstrated accuracy make it suitable for routine field measurements.
  • This technology holds significant potential for advancing aerosol research and monitoring across various scientific disciplines.