| abstract |
The invention relates to a method and a device for determining the time for modification of the physical state of a fluid medium, of the type in which a ferromagnetic ball is placed in the bottom of a cup containing the fluid to be studied and driven in a periodic movement under the effect of an external magnetic field, and in which we detect the modifications of the movements of this ball due to the modification.n n n The method is characterized by the fact that the ball always follows the same path imposed during each period and that variations in the amplitude and / or the frequency of its movement are detected.n n n Application to the measurement of the coagulation time of blood plasma. |