Encyclopedia of Biophysics

Living Edition
| Editors: Gordon Roberts, Anthony Watts, European Biophysical Societies

Fourier Transform Infrared Photoacoustic Spectroscopy (FTIR-PAS)

  • Ramazan KizilEmail author
  • Joseph Irudayaraj
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-35943-9_124-1



FTIR-PAS is a unique extension of IR spectroscopy which combines the utility of interferometry with the standard sample-gas microphone of the photothermal technique for depth-profile analysis of materials. FTIR-PAS can also be employed as a non-destructive non-contact testing modality for material characterization FTIR-PAS is the most powerful spectroscopy-based depth-profiling tool that enables nondestructive and noncontact measurements with minimal sample preparation need.

Although absorption spectrum is retrieved from FTIR-PAS experiments, the thermal behavior of the sample rather than the optical properties plays a major role in the generation of PA signal.

Basic Characteristics

The evolution of photoacoustic spectroscopy (PAS) began with the discovery of emission of sound from a thin diaphragm exposed to modulated (mechanically chopped) sunlight by Alexander Graham Bell in 1880....

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Copyright information

© European Biophysical Societies' Association (EBSA) 2018

Authors and Affiliations

  1. 1.Istanbul Technical UniversityChemical Engineering DepartmentMaslak, IstanbulTurkey
  2. 2.University of Illinois at Urbana-ChampaignBioengineering DepartmentUrbanaUSA

Section editors and affiliations

  • Andreas Barth
    • 1
  1. 1.Department of Biochemistry and Biophysics, Arrhenius LaboratoriesStockholm UniversityStockholmSweden