Trace gases detection by photoacoustic technique based on a lineal chirp excitation scheme

Abstract

We present a new photoacoustic gas-trace measurement setup, based on a chirped optical chopper. This method combines features of the resonant and pulsed techniques. To show the advantages of this setup, we carried out a comparison with the resonant method in samples of NO2 contained in a one-dimensional acoustic resonator. The results show the chirped technique allows carrying out short-term acquisitions with good signal-to-noise ratio.

Keywords

• Espectroscopía fotoacústica
• gases traza
• chirp