Automatic test system and test method for thermoelectric forces of thermocouple wires

Abstract

The invention relates to an automatic test system for thermoelectric forces of thermocouple wires. The system comprises a wire releasing device, a preprocessing device, a test unit, a meter counter, a rewinding device, a control system, a signal acquisition system and a computer which is provided with a thermoelectric force test and analysis system. The wire releasing device, the preprocessing device, the test unit, the meter counter and the rewinding device are in dynamic connection through a thermocouple wire to be tested. The control system is connected with the test unit, the meter counter and the rewinding device through wires. The signal acquisition system is connected with the test unit and the computer through wires respectively. The automatic test system for thermoelectric forces can test thermoelectric forces of thermocouple wires continuously, automatically and losslessly and has advantages of high accuracy and objectivity. The test system and the method are applicable to an entire test of thermoelectric force uniformity of all thermocouple wires.

Description

technical field [0001] The invention belongs to the field of microvoltage measurement, in particular to an automatic detection system and detection method for thermoelectric potential of thermocouple wires. Background technique [0002] Thermocouple wire is an industrial temperature-measuring material. It uses the Seebeck principle to convert temperature signals into electrical signals to achieve the purpose of temperature measurement. Therefore, the potential performance of thermocouple wire is an important indicator for judging its quality. Thermocouples are composed of different thermocouple materials for the positive and negative poles. In the relevant national standards and industry standards, the uniformity of the thermoelectric potential performance of the positive and negative poles and the potential of fixed points (such as zinc points, aluminum points, and copper points) are all available. There are clear tolerance requirements, and there are also clear regulations...

AI Technical Summary

Problems solved by technology

Since this method cannot detect the uniformity of the whole roll of wire, the test method specified in the national standard has certain limitations. Its premise is that the uniformity of the thermoelectric potential of the whole roll of wire fluctuates little

In fact, due to the uneven composition, segregation and processing technology differences of alloy materials, it is difficult to avoid large fluctuations in the thermoelectric potential of the thermocouple wire at the head, middle and tail.

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