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Related Experiment Videos

Photoacoustic spectroscopy for process analysis.

Thomas Schmid1

  • 1Institute of Hydrochemistry, Technische Universität München, Marchioninistr. 17, 81377 Munich, Germany. thomas@schmid.eu.com

Analytical and Bioanalytical Chemistry
|June 9, 2005
PubMed
Summary
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Photoacoustic spectroscopy (PAS) offers a powerful method for analyzing diverse samples, including opaque and scattering materials. This technique enables precise absorption measurements and depth profiling for industrial applications.

Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Physical Chemistry

Background:

  • Photoacoustic spectroscopy (PAS) utilizes the absorption of electromagnetic radiation and subsequent pressure fluctuations (sound waves) for detection.
  • Unlike conventional absorption spectroscopy, PAS excels in measuring absorption coefficients across a wide range, even in challenging opaque and scattering samples.
  • PAS is advantageous for trace gas monitoring and analyzing solid samples, including powders and large objects.

Purpose of the Study:

  • To provide an overview of photoacoustic excitation and detection schemes in analytical chemistry.
  • To review the applications of photoacoustic spectroscopy in process analytical technology.
  • To highlight the use of PAS for the characterization of industrial products.

Main Methods:

Related Experiment Videos

  • Detection of pressure fluctuations (sound waves or shock pulses) generated by absorbed electromagnetic radiation.
  • Measurement of absorption coefficients over several orders of magnitude.
  • Depth-profiling capabilities for layered systems.

Main Results:

  • PAS allows for the determination of absorption coefficients in opaque and strongly scattering samples.
  • Trace gas monitoring is feasible with short pathlength cells.
  • Absorption spectra of solid samples and depth-resolved characterization of industrial products are achievable.

Conclusions:

  • Photoacoustic spectroscopy is a versatile technique applicable to a wide range of sample types and analytical challenges.
  • Its ability to perform on-line monitoring without sample preparation and depth-resolved characterization makes it valuable for industrial processes.
  • PAS offers significant advantages over conventional spectroscopic methods for specific analytical tasks.