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Related Concept Videos

Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

457
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...
457
Flame Photometry: Overview01:02

Flame Photometry: Overview

804
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...
804
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

594
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
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

2.5K
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...
2.5K
Flame Photometry: Lab01:16

Flame Photometry: Lab

362
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
362
IR Spectrometers01:25

IR Spectrometers

1.5K
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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Related Experiment Video

Updated: Sep 11, 2025

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Multi-spectral imaging techniques for temperature measurement in explosion fields.

Pan Pei, Xiaojian Hao, Ziqi Wu

    Optics Express
    |August 13, 2025
    PubMed
    Summary

    This study introduces a novel multi-spectral radiometric temperature measurement method for accurately assessing explosion temperature fields. The developed multi-spectral radiation camera achieved high-precision measurements up to 2903.68 K.

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    Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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    Area of Science:

    • Thermodynamics
    • Optical Engineering
    • Explosives Science

    Background:

    • Explosion temperature fields present significant measurement challenges due to extreme temperatures and harsh environments.
    • Accurate temperature monitoring is crucial for understanding explosive behavior and ensuring safety.

    Purpose of the Study:

    • To develop a high-precision, wide-range multi-spectral radiometric temperature measurement method for explosion fields.
    • To accurately measure the high temperatures generated by 40 kg of aluminum-containing explosives.

    Main Methods:

    • A multi-spectral radiation camera (MRC) was constructed using a CMOS sensor with a 25-band multi-spectral filter array (MFA).
    • The MRC was calibrated against a high-temperature blackbody furnace (1973.15 K to 2973.15 K).
    • The generalized simulated annealing (GSA) algorithm was utilized for temperature field measurement.

    Main Results:

    • The maximum temperature of the explosion fireball reached 2903.68 K.
    • The relative temperature measurement error was determined to be a maximum of 1.93%.

    Conclusions:

    • The proposed multi-spectral radiometric method provides accurate and reliable temperature measurements in challenging explosion environments.
    • This technique is effective for characterizing the temperature dynamics of energetic materials like aluminum-containing explosives.