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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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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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Atomic Emission Spectroscopy: Instrumentation01:22

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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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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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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.
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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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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Speckle-based spectrometer.

Maumita Chakrabarti, Michael Linde Jakobsen, Steen G Hanson

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    Summary
    This summary is machine-generated.

    This study introduces a new spectrometer that uses speckle displacement to measure wavelength changes. This novel method, verified experimentally, can achieve high spectral resolution.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Experimental Physics

    Background:

    • Traditional spectrometers face limitations in resolution and complexity.
    • Speckle phenomena offer unique optical signatures sensitive to environmental changes.

    Purpose of the Study:

    • To introduce and experimentally validate a novel spectrometer concept based on speckle displacement.
    • To demonstrate the feasibility of achieving high spectral resolution using this new method.

    Main Methods:

    • Illuminating a rough surface at an oblique angle with two different wavelengths.
    • Analyzing the speckle patterns in the far field.
    • Calculating the covariance between speckle patterns to determine peak position shift.

    Main Results:

    • Speckle displacement directly correlates with changes in incident wavelength.
    • Experimental verification of the proposed spectrometer concept.
    • Demonstrated potential for achieving a spectral resolution of 100 MHz.

    Conclusions:

    • The novel spectrometer concept utilizing speckle displacement is experimentally validated.
    • This method offers a promising approach for high-resolution spectral analysis.
    • Further development could lead to compact and efficient spectrometers.