QUASI-DISTRIBUTED HOT-WIRE PROBE FOR MEASURING THE DISTRIBUTION OF GAS FLOW VELOCITY Russian patent published in 2023 - IPC G01P5/12 

FIELD: measuring tools.

SUBSTANCE: distributed measurements of physical values, namely the measurement of the distribution of gas flow velocity The device for measuring the distribution of gas flow velocities consists of: a quasi-distributed hot-wire probe with a tree structure, made with the possibility of separating the flow paths of the probing and measuring currents of the sensitive element placed in the investigated gas flow, while the separation of the flow paths of the probing and measuring currents is provided by connecting the sensitive elements in a tree structure in such a way that the sensing elements are connected at least by three elements at each connection point, forming a structure without closed loops for the flow of currents; a probing current driver configured to form a probing current of a given value; a voltage meter configured to measure the voltage drop across the interrogated sensing element; a switching node configured to connect the probing current driver and the voltage meter to the necessary terminals of the quasi-distributed hot-wire probe; a temperature sensor with a separate measuring channel, configured to measure the temperature of the investigated gas flow; digital computing and control device configured to sequentially interrogate each of the sensitive elements of the quasi-distributed hot-wire probe, determine the resistance value of the sensitive element and then use it together with the measured temperature value to determine the velocity of a part of the gas flow blowing over the interrogated sensitive element, as well as with the possibility of estimating distribution of gas flow velocities.

EFFECT: providing the possibility of measuring the distribution of gas flow velocities, as well as increasing the reliability of the measurement results by reducing the number of connecting wires for connecting sensitive elements to measuring equipment that disturb the measured gas flow.

1 cl, 3 dwg