Emfi Film as a Photoacoustic Detector

Photoacoustic spectroscopy (PAS) is based on the conversion of light to acoustic waves via absorption and local thermal relaxation. Recent progress of lasers and sensitive microphones make it one of the most sensitive gas analysis tools. The other benefits of PAS are zero background signal and simple implementation of detector. Sensitivity of the detector depends on light intensity and performance of applied acoustic pick-up. Conventional microphone design has been a tradeoff between size (sensitivity) and bandwidth but now a novel material shows promising features with respect to this problem.