A wire-sequence detection method for a dual-node heat flow sensor

Abstract

The invention discloses a method for detecting the line sequence of a dual-node heat flow sensor, which is simple in operation, convenient in use, and capable of quickly detecting the line sequence of the dual-node heat flow sensor. The dual-node heat flow sensor is a cylindrical sensor, including outer electrodes, insulating layers, inner electrodes, and compensation wires a\b\c. It can measure the temperature of two nodes at the same time. It can be used in wind tunnel tests and flight tests, but b \c is not easy to distinguish. The line sequence detection steps are as follows: (1) Install the dual-node heat flow sensor on the wall of the model; (2) Apply a thermal excitation to the head of the sensor; (3) Simultaneously measure the first compensation wire a and the other two compensation wires to be distinguished. The voltage values ​​between wires X and Y are respectively Vax and Vay; (4) compare the absolute value of the two voltage values, if |Vax|>|Vay|, then the compensation wire X is the second compensation wire b, and the compensation The wire Y is the third compensation wire c; if |Vax|<|Vay|, then the compensation wire X is the third compensation wire c, and the compensation wire Y is the second compensation wire b.

Description

technical field [0001] The invention relates to a line sequence detection method of a dual-node heat flow sensor, which belongs to the field of experimental measurement. Background technique [0002] In conventional wind tunnel tests and flight tests, coaxial thermocouples are often used to measure the heat flow on the model surface, and the coaxial thermocouples generally used are single-node coaxial thermocouples (that is, only the surface temperature of the model can be measured). If it is damaged, all the temperature information at the measurement position will be lost, and the risk is greater. In addition, the heat flow measurement using a single-node coaxial thermocouple can only obtain the surface temperature of the model, and the information obtained from the measurement is less, which brings great benefits to the heat flow identification of the model surface in complex areas. difficulty. Contents of the invention [0003] The technical problem solved by the prese...

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Problems solved by technology

[0003] The technical problem solved by the present invention is: to provide a dual-node heat flow sensor. At the same time, aiming at the problem that the sensor line sequence is not easy to distinguish, a line sequence detection method is proposed. By applying thermal excitation to the top node of the sensor, the front and rear of the sensor A measurement node produces a temperature difference, and simultaneously measures the voltage value between two compensation wires of the same material and another compensation wire, and distinguishes the order of the two compensation wires of the same material according to the relative magnitude of the voltage absolute value

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