DEVICE FOR MEASURING THERMAL PHYSICAL PROPERTIES AT REST AND IN FLOW Russian patent published in 2023 - IPC G01N25/18 G01R27/22 

FIELD: measurement equipment.

SUBSTANCE: method for measuring the thermophysical properties of materials and gases that can be used to measure thermal diffusivity, thermal conductivity, thermal activity, and boiling points for liquids, gases, and plastic bodies, and boiling point for liquids, as well as the values of thermal diffusivity, thermal conductivity, thermal activity, and kinematic viscosity for liquid and gas flows. The essence of the proposed solution is rapid heating of the body under study by the resistive element of the resistance thermometer sensor during an electric current pulse at the point of its contact, registration of the sensor resistance in one heating pulse with a given frequency of signal acquisition, transfer of measurement results to a personal computer for further processing - calculation of values: thermal diffusivity, thermal conductivity, thermal activity, kinematic viscosity in the flow; thermal diffusivity, thermal conductivity, thermal activity without the flow; temperatures of homogeneous nucleation. The device contains 5 channels for measuring the resistance of the resistance thermometer sensor capable of working simultaneously with different specified experimental parameters. For each measurement channel, before the experiment, you can set the voltage, the time of the sensor heating current pulse, the number of current pulses, the interval between current pulses, the frequency of receiving a signal from the sensor about its electrical active resistance during heating by a current pulse. The device uses direct current voltage from the power supply to operate. The current on the sensor has a constant value, changing abruptly at the beginning and end of the pulse in a “U”-shaped manner.

EFFECT: increased information content of measurements and reduced duration of the experiment.

2 cl, 3 dwg