Pulsed Laser Photoacoustic Aerosol Analysis


  • Development of a pulsed laser photoacoustic system for Gas/aerosol analysis
  • Multiwavelength layout
  • Evaluation in comparison to modulated PA spectroscopy
  • Application to exhaust gas

Method of Approach

  • Setup of an OPO-based PA system (tuning range from 420 nm to 2500 nm)
  • Setup of a three-wavelength system using a single laser
  • Evaluation for gases and aerosols
  • Characterization of various cell designs


A photoacoustic spectrometer for the measurement of aerosol absorption spectra, based on the excitation of a pulsed nanosecond optical parametrical oscillator (OPO), has been demonstrated . This spectrometer is working at ambient pressure and can be used to detect and characterize different classes of aerosols. The spectrometer features a spectral range of 410 nm to 2500 nm and a sensitivity of 2.5 × 10−7 m−1 at 550 nm. As we demonstrate, it is possible to determine a specific optical absorption per particle by a combination of the new spectrometer with an aerosol particle counter.

Currently, we develop another pulsed PA system, based on a single, high-repetition laser, emitting three different wavelengths (1064 nm, 532 nm, 366 nm). Possible applications can be environmental as well as process anlytical challenges. 


Generous support by the following companies is gratefully acknowledged

  • InnoLas Laser GmbH
  • GWU-Lasertechnik
  • BFI-Optilas
  • Fine Adjustment

Financial Support



  • Peter Menzenbach
  • Christoph Haisch


Haisch, C.; Menzenbach, P.; Bladt, H.; Niessner, R., A Wide Spectral Range Photoacoustic Aerosol Absorption Spectrometer. Anal. Chem. 2012, 84 (21), 8941–8945.