Fourier Transform Infrared Photoacoustic Spectroscopy (FTIR-PAS)
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.
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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