Photoacoustic Spectroscopy

Exploring Photoacoustic Spectroscopy

Photoacoustic (PA) spectroscopy operates on the principle of infrared radiation absorption by a sample. This absorption results in heating the sample, which in turn transfers the absorbed heat to the adjacent gas. As the FTIR’s measurement signal undergoes modulation by the interferometer scanner, it induces pressure oscillations in the neighboring gas. A delicate microphone picks up these pressure waves, transforming them into an electrical impulse. Essentially, the sample, in conjunction with the PA cell, acts as the detection apparatus. This method is inherently non-invasive, remains unaffected by sample morphology, and typically negates the need for sample preparation.

Modern advancements in photoacoustic spectroscopy accessories have elevated both sensitivity and measurement velocity compared to their predecessors. Such enhancements are rekindling interest in this captivating measurement technique, broadening its applicability across a more diverse set of FT-IR scenarios. Especially, it’s now facilitating the analysis of samples that were previously challenging to prepare, and it’s streamlining complex research procedures.