In a method for detecting a variation, such as a variation in the concentration of a substance, in a flowing medium, a sample of the medium is made to flow past a sensor for detecting the variation, with the direction of flow of the sample being reversed and the velocity of the sample in relation to...http://www.google.fr/patents/US6000397?utm_source=gb-gplus-shareBrevet US6000397 - Method and device for detecting a variation in a flowing medium
Method and device for detecting a variation in a flowing medium
