ACOUSTIC DEVICE FOR DETERMINING VISCOSITY AND TEMPERATURE OF LIQUID IN ONE REGION OF LIQUID SAMPLE AND MEASUREMENT TECHNIQUE USING SAID DEVICE Russian patent published in 2010 - IPC G01N29/02 G01N11/00 

FIELD: physics.

SUBSTANCE: device for simultaneous measurement of viscosity and temperature of a liquid in one region of a liquid sample has a piezoelectric plate with thickness h. The device also has one input and one output interdigital transducer with period λ of the order of the thickness h. The interdigital transducers are formed on one surface of the plate and are designed for generating and receiving the acoustic lamellar oscillation mode in the plate. The device also has a zone for interaction of the acoustic lamellar oscillation mode with the liquid sample formed on the opposite surface of the plate. Presence of liquid causes detectable changes in speed and amplitude of the oscillation mode. The device also has apparatus for generating an electric signal at the corresponding frequency which is transmitted to the input interdigital transducer and apparatus which receives the signal from the output interdigital transducer which picks up oscillation modes the speed and amplitude when passing through the zone for interaction with the liquid sample. The device also has a control apparatus which processes changes using software and hardware for calculating viscosity and temperature values of the liquid sample from changes in the acoustic lamellar oscillation mode.

EFFECT: higher accuracy of simultaneous measurement of viscosity and temperature of a liquid in one region of a liquid sample.

8 cl, 2 tbl,13 dwg