Microphone comprising at least one perforated rigid membrane and at least one flexible membrane placed at a distance from the rigid membrane so as to form an enclosure between the rigid membrane and the flexible membrane, the flexible membrane being suited to being displaced by a sound vibration of air outside of the microphone via the perforated rigid membrane, said microphone being characterised in that it comprises means for measuring the quantity of at least one gas, said means for measuring being mounted in the enclosure in order to measure at least one gas present in said enclosure.
