NUMERICAL INVESTIGATION ON THE PERFORMANCE OF A T-TYPE RESONANT PHOTOACOUSTIC CELL

摘要

The effect of geometrical parameters on the performance of a T-type resonant photoacoustic cell, composed of one resonator and an absorbing cylinder, is numerically analyzed in this study. Our model directly solves linearized forms of the continuity equation, Navier-Stokes equation, energy equation, and equation of state using a finite element method under an assumption that the variations in the velocity, pressure and temperature fields inside the cell are enough small. To quantify the geometrical effect on the cell performance, we evaluated the acoustic pressure at a position of microphone, quality factor and resonance frequency by varying the length and diameter of the absorbing cylinder. We also studied the effect of the length of the resonator on the acoustic pressure. Our results would provide useful inputs into a systematic size optimization of the T-type resonant photoacoustic cell for better performance.