LUMPED MASS VIBRO-VISCOMETRIC SENSOR Russian patent published in 2018 - IPC G01N11/10 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the field of measurement technology and can be used to determine by the vibrational method the change in the shear viscosity of small volumes of liquid in a local area while simultaneously measuring its temperature. Vibro-viscometric sensor containing a spherical miniature probe, a thermocouple probe temperature gauge, mechanical oscillatory system rigidly coupled to the probe and bonded to a rigid dielectric base, an exciter of vibrations of a mechanical oscillatory system. Two tubular piezoactuators are rigidly fixed at an angle to each other, the working part of which is located on the lower side of the base, and the contact part of the piezoactuators is located on the upper side of the base. Mechanical oscillatory system includes a probe, a base with piezoactuators, two rigid thin dielectric capillaries of equal length, which pass coaxially inside the piezoactuators and are rigidly fixed on one side at the ends or in the working part of the piezoactuators, and on the other hand are connected together and rigidly fixed on the surface or inside the probe. In this case, various electrical conductors pass through the capillaries, forming a measuring junction of a thermocouple probe temperature probe at the junction, and on the outside of the capillaries and bases, dissimilar conductors form the reference junction of a thermocouple probe temperature gauge. In this case, one of the two piezoactuators electrically connected to the source of electrical oscillations is the mechanical exciter of vibrations of the mechanical oscillation system, and the second piezoactuator serves as a sensor for the current position of the probe.

EFFECT: ensuring high sensitivity of the sensor with a small change in viscosity, reducing the effect of acoustic noise on the viscous flow of the liquid being studied, ensuring a uniform temperature field in the vicinity of the probe.

7 cl, 1 dwg