Photoacoustic study of gaseous carbon disulfide with a pulsed nitrogen laser

Abstract

The photoacoustic effect has been used to study gaseous Carbon Disulfide. A 1.25-MW nitrogen laser having a wavelength of 337 nm and pulse duration of 800 ps was used as the photoacoustic source when typically, continuous-wave lasers modulated at the resonant frequency of the photoacoustic test cell are used to detect rarified gases. For this work, several photoacoustic test cells, designed and constructed to optimize the acoustic signal, were used in order to detect the presence of a gas at low concentration. A variety of detectors were used including a condenser microphone, PVDF tranducer, optical probe beam deflection, and a fiber optic sensor. Results will also be presented showing the relationship between gas concentration and pressure.