Product Category: Detectors, interface

A Redundant, Immune, Calibrated Gas Detector

October 2012, Vol. 239 No. 10

OptoAcoustic gas detection determines gas content via the measurement of acoustic pressure waves that are propagated as a gas is irradiated under an appropriately tuned light.

A gaseous mixture sample passes through a membrane into a measurement cell which contains an optical light source and a microphone. Incident light modulated at a specific frequency is briefly absorbed as intermolecular energy by the gas molecules and then released as translational energy, creating periodic temperature and pressure changes that generate measurable acoustic pulses.