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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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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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A new compact spectrometer precisely measures water isotope ratios in real-time using laser absorption spectroscopy. This advanced sensor offers high-speed, accurate measurements for environmental and medical research.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Environmental Science

Background:

  • Accurate measurement of water isotope ratios (δ18O, δ17O) is crucial for various scientific fields.
  • Traditional methods for isotope ratio analysis can be time-consuming and lack real-time capabilities.

Purpose of the Study:

  • To develop a compact spectrometer for high-precision, real-time water isotope ratio measurement.
  • To demonstrate the effectiveness of laser absorption spectroscopy and weighted Kalman filtering for this application.

Main Methods:

  • Utilized a mid-infrared optical sensor and laser absorption spectroscopy.
  • Applied the weighted Kalman filtering method for data processing.
  • Achieved high precision measurements for δ18O and δ17O.

Main Results:

  • Achieved measurement precision of 0.41‰ for δ18O and 0.29‰ for δ17O within 1 second.
  • Demonstrated significantly faster measurement times compared to standard running average techniques (1 s vs. >90 s).

Conclusions:

  • The developed compact spectrometer provides high-precision and real-time water isotope analysis.
  • This technology has potential applications in atmospheric research and breath gas analysis.