GAS DETECTOR HAVING AN ACOUSTIC MEASURING CELL AND SELECTIVELY ADSORBING SURFACE

摘要

A gas detector having a selectively adsorbing surface (3) and an acoustic measuring cell (5) is presented. The detector is distinguished by the fact that the selectively adsorbing surface (3) and the acoustic measuring cell (5) can be arranged with respect to one another in such a manner that gases desorbed by means of thermal desorption from the adsorbing surface (3) pass into the acoustic measuring cell (5) and trigger a pressure wave there which can be measured by one or more sound pick-ups (13, 14), in particular microphones, which are arranged in the acoustic measuring cell (5). A corresponding method is also provided. The detector is particularly suitable for measuring harmful substances in inside spaces and ventilation devices.