| 摘要 |
In a method for detecting a variation, such as a variation in the concentration of a substance, in a flowing medium, whereby a sample of the medium is made to flow past a sensor (20, 24) for detecting the variation, the direction of flow of the sample is reversed and the velocity of the sample in relation to the sensor (20, 24) is reduced during the samples passage through the sensor. Thus, a device for detecting such a structure or variation contains a sensor (22, 24) and means (28, 32) for reversing the direction of flow and reducing the velocity of the sample of the medium. <IMAGE> |
