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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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Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared
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Optimized wavelength selection for molecular absorption thermometry.

Xinliang An1, Andrew W Caswell, John J Lipor

  • 1FCA US LLC, 800 Chrysler Drive, Auburn Hills, MI 48326 USA.

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|April 25, 2015
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Summary
This summary is machine-generated.

Differential evolution (DE) optimizes water absorption thermometry by selecting key wavelengths. For narrow ranges, two wavelengths suffice; for wide ranges, four wavelengths offer better precision than a full spectrum.

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Area of Science:

  • Spectroscopy
  • Thermometry
  • Chemical Engineering

Background:

  • Water absorption thermometry utilizes spectroscopic methods for temperature measurement.
  • Optimizing wavelength selection is crucial for enhancing temperature precision.

Purpose of the Study:

  • To apply a differential evolution (DE) algorithm to identify optimal wavelengths for water absorption thermometry.
  • To evaluate the impact of wavelength set size on temperature measurement precision across different temperature ranges.

Main Methods:

  • Utilized a differential evolution algorithm to search through a large population of wavelengths (120,000).
  • Analyzed fixed wavelength sets within the 7280-7520 cm(-1) range.
  • Optimized for both narrow and wide temperature ranges (280-2800 K).

Main Results:

  • For narrow temperature ranges, optimal precision was achieved using two highly temperature-sensitive wavelengths.
  • In wide temperature ranges, a four-wavelength set improved precision by a factor of 2 compared to a two-wavelength set.
  • A complete spectrum (120,000 wavelengths) performed 4.3 times worse than the optimal two-wavelength set.

Conclusions:

  • For spectroscopic temperature sensitivity, monitoring two or three wavelengths is often sufficient, depending on the operating range.
  • While a complete spectrum approach incurs a precision penalty, it may be acceptable in applications, especially at elevated pressures.