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UV–Vis Spectrometers01:14

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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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Related Experiment Video

Updated: Jun 28, 2026

Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
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Published on: June 9, 2016

Emissivity range constraints algorithm for multi-wavelength pyrometer (MWP).

Jian Xing, R S Rana, Weihong Gu

    Optics Express
    |August 25, 2016
    PubMed
    Summary
    This summary is machine-generated.

    A new emissivity range constraint method optimizes multi-wavelength pyrometer (MWP) algorithms for rapid high-temperature measurement. This significantly reduces data processing time and improves efficiency by over 90% for accurate temperature readings.

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    Area of Science:

    • Metrology
    • Optical Engineering
    • Thermodynamics

    Background:

    • Accurate temperature measurement of high-temperature targets is crucial in many industrial processes.
    • Traditional multi-wavelength pyrometers (MWP) can be limited by emissivity variations, affecting measurement speed and accuracy.

    Purpose of the Study:

    • To develop an optimized data processing algorithm for MWP that minimizes the effect of emissivity on temperature measurements.
    • To enhance the speed and efficiency of high-temperature measurements using MWP.

    Main Methods:

    • Developed emissivity range constraints to optimize the MWP data processing algorithm.
    • Explored the relationship between emissivity deviation and true temperature by fitting data from various target models.
    • Obtained an effective search range for emissivity in each iteration to reduce processing time.

    Main Results:

    • Achieved a calculation time reduction of 0.2 seconds at 1800K true temperature.
    • Maintained an absolute error of 25K.
    • Demonstrated an efficiency improvement exceeding 90% compared to previous algorithms.

    Conclusions:

    • The developed method significantly enhances the speed and efficiency of high-temperature measurements using MWP.
    • The approach is simple, rapid, and suitable for in-line temperature monitoring.
    • Emissivity range constraints effectively mitigate emissivity's impact on pyrometric measurements.