Photoacoustic spectrometry (PAS) is a new method for trace gas detection based on the photoacoustic effect, which has high sensitivity, high selectivity and large dynamic detection range.

• 光声光谱技术是基于光声效应的一种新型微量气体检测技术，具有灵敏度高，选择性好，动态检测范围大等优点。