METHOD AND DEVICE OF THE EXTERNAL RESONANT EXCITATION OF MECHANICAL OSCILLATING SYSTEM OF VISCOSIMETER Russian patent published in 2017 - IPC G01N25/00 

FIELD: measurement technology.

SUBSTANCE: invention relates to investigation of properties of liquids by means of thermal equipment and can be used for analysis of dynamic processes of thermostimulated adjustment of multi-component liquids. Method is in the fact that continuously varied frequency of exciter vibrations until resonance frequency obtainment, which is determined by the specified and recorded in the control program of the microcontroller at each frequency in operating frequency range of phase shift between exciter oscillations and oscillations of output amplified and frequency-filtered position sensor signal, determined by equation ϕ₃(ω)=ϕ_f(ω)+π/2. Device of external resonant excitation includes vibrations exciter of the probe mechanical oscillating system, probe position sensor and device for recording and control of viscosimeter based on a microcontroller, position sensor output is connected to the input of electronic amplifier, output of which is connected to input of frequency-filter circuit, output of which is connected to the microcontroller, the microcontroller output is connected to the control input of vibrations exciter.

EFFECT: technical result is in improvement of accuracy and expansion of workspace of measuring dynamic viscosity and density of examined fluids by viscosimeter depending on temperature at any final q-factor of oscillating system.

2 cl, 1 dwg