Wide temperature range magnetic flux temperature characteristic measurement device and method

Abstract

The invention discloses a wide temperature range magnetic flux temperature characteristic measurement device and method. The device comprises a sample chamber, a sensing signal collection system, a temperature detection and control system, and a computer control and processing system (5), wherein the sample chamber comprises a constant temperature chamber (11) and a variable temperature chamber (12) that are respectively used for placing a standard sample (6) and a to-be-tested sample (7), the sensing signal collection system is used for detecting a magnetic flux signal difference between theto-be-tested sample (7) and the standard sample (6), the temperature detection and control system is at least used for regulating and controlling and measuring temperature of the variable temperaturechamber (12), and the computer control and processing system (5) is connected with the sensing signal collection system and the temperature detection and control system, and is at least used for controlling a working state of the temperature detection and control system. In the wide temperature range magnetic flux temperature characteristic measurement device, a sensing voltage signal is producedby overturning a sample, and a method of showing difference of sensing voltage signals collected by two Helmholtz coils is adopted, so that a magnetic flux signal is measured more accurately. The widetemperature range magnetic flux temperature characteristic measurement device and method are suitable for measuring a low temperature coefficient permanent magnetic material with temperature coefficient higher than -1%% / DEG C.

Description

technical field [0001] The invention particularly relates to a device and method for measuring magnetic flux temperature characteristics in a wide temperature range, belonging to the technical field of magnetic material testing. Background technique [0002] As an important functional device, permanent magnet materials are widely used in advanced weapons and equipment. The temperature stability of permanent magnet materials directly determines the stability and reliability of the entire weapon and equipment. With the development of high-precision requirements for weapons and equipment, a fluctuation requirement of 30ppm / ℃ is put forward for the flux of permanent magnet materials. This index not only puts forward higher requirements for the development of high-stability permanent magnet materials, but also puts forward higher requirements Detection technology poses enormous challenges. [0003] CN 102830375 A discloses a device and method for measuring the magnetic flux temp...

AI Technical Summary

Problems solved by technology

[0003] CN 102830375 A discloses a device and method for measuring the magnetic flux temperature characteristics of permanent magnets and permanent magnet materials in an open circuit. According to the principle of electromagnetic induction, the signal is obtained by pulling the sample in a Helmholtz coil to generate an induced electromotive force, and the temperature of the sample changes. The system is separated from the signal generation system and the sample lifting control system, which avoids the influence of the current on the magnetic flux signal during the heating and cooling process of the sample, but the disadvantage is that the temperature control accuracy of the sample is low

[0004] Especially for measuring ultra-low temperature coefficient permanent magnet materials whose temperature coefficient is better than 0.3%% / ℃, the existing detection devices and methods have problems such as poor temperature control accuracy or signal acquisition accuracy, low resolution, poor repeatability, etc. A better measurement method to meet the needs of high-precision detection

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