Photoacoustic sensing with micro-tuning forks

Abstract

Different modifications of quartz enhanced photoacoustic spectroscopy (QEPAS) are discussed. An analysis of the signal-to-noise ratio for the generated photoacoustic signal gives hints for an optimized geometry of tuning fork and acoustic resonator. Furthermore, simultaneous or alternate photoacoustic and electrical driving is discussed, leading the way to new detection schemes that are capable of measuring changes in molecular relaxation dynamics

Theoretical analysis of a resonant quartz-enhanced photoacoustic spectroscopy sensor

“…Moreover, it involves multiphysics phenomena which are difficult to handle simultaneously. For these reasons, multiphysics modeling of resonant QEPAS experiments has only been carried out by use of numerical simulations so far [14][15][16][17]. For example, Cao et al numerically investigated the influence of the length and inner diameter of two acoustic tubes used in an on-beam configuration [16].…”