Trace-gas analysis by photoacoustic spectroscopy with near-infrared diode lasers

摘要

An inexpensive and portable gas photoacoustic monitoring system fabricated and tested. High sensitivity was achieved by a resonant-type photoacoustic cell at short optical path length. The minimum detectable acetylene concetration is about 2OQppbV at atmospheric pressure, which corresponds to a minimum detectable absorption coefficient of approximately 2.1 × 10{sup}(-8) cm{sup}(-1). The technique introduced here can be easily applied also to other gases.