<title>A new approach to photoacoustic measurements</title>

Abstract

The paper presents selected aspects of free space photoacoustics. The photoacoustic cell used in most of photoacoustic measurements introduces some limitations in receiving photoacoustic signal, which cause partial loss of photoacoustic signal energy. Use of photoacoustic cell results in conversion of a part of acoustical energy into different dissipative phenomena and/or processes which intensity depend on quality and design of the photoacoustic cell. Free space photoacoustic method offers capability of examination of perfect photoacoustic phenomenon without any vessels or constrains resulting from existence of a photoacoustic cell. Free space photoacoustic method can be applied not only to qualitative detection of ultra low leakages but also to quantitative measurements.