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Apparatus and method for measuring electromagnetic characteristic variation of material

An electromagnetic and property technology, applied in the field of measurement, can solve the problems of inability to judge the change of electromagnetic properties of materials, high cost, and many restrictions on use.

Inactive Publication Date: 2005-12-21
SHANDONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned several devices and their usage methods are mostly used in scientific experiments in the laboratory. The instruments are precise, expensive, and have many restrictions in use.
The Chinese patent application number 031124739 discloses a test method and device for the change of electromagnetic properties of materials, which uses the basic principle of electromagnetic induction method, including the following steps: sample preparation, magnetic circuit assembly, line connection and debugging, measurement and data record; and a special device based on the above-mentioned material electromagnetic property test method, which is composed of two differential coils using a C-shaped iron core and corresponding measuring instruments; this invention is low in cost, easy to use, and has a wide range of applications, especially for Measurement of the change of electromagnetic properties of liquid metal, but there is still the problem that the monotonicity of the change of electromagnetic properties of the material cannot be judged during the measurement process

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  • Apparatus and method for measuring electromagnetic characteristic variation of material
  • Apparatus and method for measuring electromagnetic characteristic variation of material
  • Apparatus and method for measuring electromagnetic characteristic variation of material

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Experimental program
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Embodiment 1

[0020] Embodiment 1, use this device and corresponding method to the measurement process and result of metal aluminum:

[0021] Measuring device:

[0022] ◆The circuit and magnetic circuit are assembled in the following way: the output end of the primary winding I[11] is connected to the input end of the primary winding II[12], the input end of the primary winding I[11] is connected to the output end of the primary winding II[12] Form the signal input terminal; the input terminal of the secondary winding I[8] is connected to the input terminal of the secondary winding II[15] and connected to the signal ground, and the output terminal of the secondary winding I[8] is connected to the input terminal of the secondary winding II[15] The output terminal of the AG253 signal generator [1] is connected to the signal input terminal of the coil, and the output terminal of the secondary winding I[8] is connected to the signal input terminal of the rectifying and filtering device I[7]. T...

Embodiment 2

[0028] Embodiment 2, use this device and corresponding method to the measurement process and result of copper-tin alloy:

[0029] Measuring device:

[0030] ◆The circuit and magnetic circuit are assembled in the following way: the output end of the primary winding I[11] is connected to the input end of the primary winding II[12], the input end of the primary winding I[11] is connected to the output end of the primary winding II[12] Form the signal input terminal; the input terminal of the secondary winding I[8] is connected to the input terminal of the secondary winding II[15] and connected to the signal ground, and the output terminal of the secondary winding I[8] is connected to the input terminal of the secondary winding II[15] The output terminal of the AG253 signal generator [1] is connected to the signal input terminal of the coil, and the output terminal of the secondary winding I[8] is connected to the signal input terminal of the rectifying and filtering device I[7]. ...

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Abstract

Two sets of rectifying and filtering units are adopted to process the measurement signal outputted from a signal output end of coil. Then, subtracter is utilized to carry out subtraction operation for two routes of signal processed. After signal is input into computer, specific treatment is carried out by software so as to output chart between electromagnetic properties and temperature of sample varied with time. Futures are: simple structure, low cost, easy of use, wide suitable range and high measuring accuracy. The invention is able to determine monotonicity of varied electromagnetic properties of material, and suitable to measuring liquid metal.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a device and a method for measuring changes in electromagnetic properties of materials using the basic principle of electromagnetic induction. Background technique [0002] At present, the main methods for measuring magnetic properties such as magnetic susceptibility of substances include Faraday method and induction method. [0003] The electromagnetic induction method is to use the basic principle of electromagnetic induction to measure the current or voltage induced by the magnetic field in the induction coil, and then calculate the magnetic susceptibility of the sample. Vibrating sample magnetometer (VSM), AC Susceptometer (AC Susceptometer), superconducting quantum interferometer (SQUID magnetometers) and other equipment are examples of the application of this method. The above-mentioned several devices and their usage methods are mostly used in scientific e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12
Inventor 田学雷国洪轩刘锦波陈熙琛侯纪新郑洪亮田卫星
Owner SHANDONG UNIV