| 摘要 |
The invention shows an apparatus (1, 15, 22) and a method for determining the longitudinal viscosity of a liquid (2) provided in at least one measuring chamber (3, 16, 23) having at least one tube (6, 18, 24), in which the first tube (6) which is in contact with the liquid (2) is caused to radially vibrate (8) using a piezoelectric effect, measurement data (Z, VOUT1, VOUT2) relating to the vibration excitation of the liquid (2) caused by the radial vibrations (8) of the first tube (6) is acquired, and the measurement data (Z, VOUT1, VOUT2) is used to calculate a damping coefficient (DK) which describes the damping on account of the liquid (2) and is used to determine the longitudinal viscosity of the liquid (2), wherein the liquid (2) experiences vibration excitation in at least one measuring chamber (3, 16, 23) having a lateral surface (5) or lateral surfaces (5, 17, 21, 26) formed solely by parallel straight lines. |
