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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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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 Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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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).
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....
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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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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.
594
IR Spectrometers01:25

IR Spectrometers

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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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Advanced multispectral thermometry method based on an improved light spectrum optimizer for reliable temperature and

Xiang Wang, Luo Gu, Yue Lin

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    |August 13, 2025
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    Summary

    This study introduces a novel multispectral thermometry method for accurate, non-contact temperature and emissivity measurement. The advanced algorithm processes spectral data in real-time, overcoming limitations of existing techniques for broader applications.

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    Area of Science:

    • Physics
    • Optical Engineering
    • Metrology

    Background:

    • Multispectral thermometry enables non-contact temperature and emissivity measurement.
    • Current methods face challenges in data processing, real-time inversion, and emissivity-wavelength relationship modeling.

    Purpose of the Study:

    • To develop an advanced multispectral thermometry method for accurate temperature and emissivity inversion.
    • To overcome limitations of existing techniques, enabling real-time processing without emissivity-wavelength modeling.

    Main Methods:

    • An improved light spectrum optimizer incorporating the Cauchy distribution inverse cumulative function for accelerated convergence.
    • Direct processing of multispectral data using Planck's law, avoiding Wien's approximation and emissivity-wavelength relationship modeling.
    • Real-time inversion of temperature and emissivity.

    Main Results:

    • The proposed method accurately determines temperature and emissivity with minimal relative error.
    • Validation through simulations and real experiments using a Fourier transform spectrometer.
    • Successful acquisition of multispectral data from blackbody and high-temperature targets.

    Conclusions:

    • The developed multispectral thermometry method offers a significant enhancement over traditional techniques.
    • The approach demonstrates feasibility and reliability for practical applications.
    • This advancement promises improved non-contact temperature and emissivity measurement capabilities.