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Related Concept Videos

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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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Related Experiment Video

Updated: Sep 14, 2025

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A Closed Optical Path Trace H2S Sensing System Based on Vacuum Ultraviolet Differential Absorption Spectroscopy

Mu Li1, Rui Zhu1, Jie Gao1

  • 1Measurement Technology & Instrumentation Key Laboratory of Hebei Province, Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China.

ACS Sensors
|July 21, 2025
PubMed
Summary

A new closed optical path system accurately detects trace hydrogen sulfide (H₂S) using vacuum ultraviolet absorption spectroscopy. This method overcomes oxygen interference, achieving a low detection limit for industrial applications.

Keywords:
closed optical pathhydrogen sulfidepoint cloud segmentationsinusoidal spectral reconstructionultraviolet differential optical absorption spectroscopy

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Environmental Monitoring

Background:

  • Accurate detection of trace hydrogen sulfide (H₂S) is crucial for industrial emission reduction and power troubleshooting.
  • Ultraviolet differential optical absorption spectroscopy (UV-DOAS) is a promising technique, but spectral overlap from oxygen (O₂) and H₂S's irregular absorption complicate measurements in the vacuum ultraviolet band.

Purpose of the Study:

  • To develop a closed optical path H₂S sensing system using vacuum ultraviolet absorption spectroscopy.
  • To overcome spectral interference from O₂ and accurately measure low concentrations of H₂S.

Main Methods:

  • Implemented a closed optical path structure to eliminate O₂ interference.
  • Employed a spectral line analysis method combining sinusoidal spectral reconstruction (SSR) and point cloud segmentation.
  • Organized irregular H₂S absorption features for enhanced low-concentration measurement.

Main Results:

  • The system accurately measures H₂S dynamically at low concentrations in the vacuum ultraviolet band.
  • Achieved a mean relative error (MRE) of 1.61%.
  • Reached a detection limit of 41.2 ppb for H₂S with a 100 s detection time.

Conclusions:

  • The proposed closed optical path system effectively addresses O₂ spectral interference in H₂S measurements.
  • This method offers a significant advancement in H₂S detection sensitivity and accuracy for UV-DOAS applications.
  • Represents a best-in-class H₂S measurement level for direct UV-DOAS technology application.