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Related Concept Videos

Absorption of Radiation01:05

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Atomic Emission Spectroscopy: Overview01:20

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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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A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
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Atomic Spectroscopy: Effects of Temperature01:27

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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.
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IR Spectrometers01:25

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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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[Multispectral Radiation Algorithm Based on Emissivity Model Constraints for True Temperature Measurement].

Mei Liang, Xiao-gang Sun, Mei-sheng Luan

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    A new rapid inversion method for multispectral radiation true temperature measurement significantly improves processing speed by 19-43% compared to the second measurement (SM) method, while maintaining precision for non-contact temperature sensing.

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    Area of Science:

    • Thermometry
    • Optical Engineering
    • Materials Science

    Context:

    • Non-contact temperature measurement is crucial for industrial manufacturing and scientific experiments.
    • Radiation thermometry, particularly multispectral methods, is widely used.
    • The Second Measurement (SM) method, while common, has limitations in on-line data processing.

    Purpose:

    • To develop a rapid inversion method for multispectral radiation true temperature measurement.
    • To address the limitations of the SM method in real-time applications.
    • To introduce emissivity model constraint conditions for improved accuracy.

    Summary:

    • A novel rapid inversion algorithm for multispectral radiation thermometry is proposed, utilizing emissivity model constraints based on multispectral brightness temperature data.
    • The method simplifies emissivity assumption by reducing classes and leverages wavelength-dependent brightness temperature relationships.
    • Simulation experiments with various emissivity trends demonstrate significant speed improvements (19.16%-43.45%) over the SM method with comparable precision.

    Impact:

    • Enables faster, on-line true temperature measurements in industrial and scientific settings.
    • Reduces computational complexity and resource requirements for temperature sensing.
    • Enhances the applicability of multispectral radiation thermometry for dynamic processes.