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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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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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High-Performance Liquid Chromatography: Types of Detectors01:15

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Hydrogen Sensor Based on Tunable Diode Laser Absorption Spectroscopy.

Viacheslav Avetisov1, Ove Bjoroey1, Junyang Wang1,2

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Summary
This summary is machine-generated.

A new laser sensor accurately measures molecular hydrogen (H2) contactlessly. This H2 sensor achieves high precision, making it suitable for industrial applications.

Keywords:
TDLASWMSabsorption spectroscopydiode lasergas sensorhydrogenhydrogen sensorlaser spectroscopy

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Area of Science:

  • Spectroscopy
  • Laser-based sensing
  • Gas analysis

Background:

  • Molecular hydrogen (H2) detection is crucial for industrial safety and process monitoring.
  • Contactless sensing methods are desirable for in situ measurements in harsh environments.
  • Understanding H2 spectral line shapes is key to accurate gas sensing.

Purpose of the Study:

  • To develop and evaluate a laser-based sensor for contactless molecular hydrogen (H2) measurement.
  • To investigate collisional broadening and narrowing effects on the H2 absorption line at 2121.8 nm.
  • To demonstrate the sensor's applicability and performance for H2 concentration measurement.

Main Methods:

  • Utilized a distributed feedback (DFB) laser targeting the H2 quadrupole absorption line at 2121.8 nm.
  • Employed wavelength modulation spectroscopy (WMS) for H2 detection.
  • Compared experimental linewidth measurements with detailed models incorporating collisional narrowing effects.

Main Results:

  • Determined collisional broadening and narrowing parameters for H2 in various gas mixtures.
  • Demonstrated sensor applicability for H2 measurement in the 0-10 %v range.
  • Achieved high precision: 0.02 %v with 1s integration and 0.005 %v∙m with 20s averaging.
  • Observed a strong linear relationship between H2 concentration and sensor response.

Conclusions:

  • The developed laser-based WMS sensor provides accurate, contactless H2 measurement.
  • The sensor's robust design is suitable for in situ installation in demanding industrial settings.
  • The detailed analysis of spectral line shapes enhances sensor performance and reliability.