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Eddy current conductivity measurement sensor

A technology for measuring sensors and conductivity, applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems of low resolution of measuring sensors and great influence of lift-off, etc., to ensure measurement accuracy and device The effect of simple structure and high precision

Inactive Publication Date: 2017-04-12
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of low resolution of the existing eddy current conductivity measurement sensor, which is greatly affected by lift-off, and propose a high-resolution, temperature compensation function, and can effectively suppress the lift-off effect within a certain range Non-ferrous metal conductivity measurement sensor

Method used

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  • Eddy current conductivity measurement sensor
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  • Eddy current conductivity measurement sensor

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Embodiment Construction

[0037] The structural block diagram of sensor of the present invention is as Figure 1-Figure 5 As shown, the sensors include:

[0038] The measuring probe 1 and the signal processing circuit are connected by a connecting cable;

[0039] The measuring probe includes: a measuring coil 1a, a compensation coil 1b, the parameters of the measuring coil and the compensation coil are exactly the same, the measuring coil and the compensation coil are connected in a differential manner, and an AC bridge structure is used for output; a handheld heat-insulating shell, an electromagnetic shielding layer, micro switch, pressure spring, detection circuit, temperature sensor and connecting cable;

[0040] The measuring coil is placed at one end of the hand-held heat-insulating housing and the measuring surface is exposed; the pressure spring is located between the first protrusion 11 and the second protrusion 12;

[0041] The signal processing circuit includes: a sine excitation unit, a ba...

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Abstract

The invention relates to an eddy current conductivity measuring sensor. The eddy current conductivity measuring sensor comprises a probe and a signal processing circuit, wherein the probe and the signal processing circuit are connected through a connecting cable (3). The probe comprises a measuring coil (1a), a compensating coil (1b), a hand-held thermal insulation shell, an electromagnetic shielding layer, a microswitch, a compression spring and a temperature sensor. The signal processing circuit comprises a sine excitation unit, a balance filtering unit, a front amplification unit, a peak holding unit, a phase sensitive detection unit, a digital phase rotating unit and an ARM unit. The measuring result of the eddy current conductivity measuring sensor is not influenced by temperature when the temperature ranges from 0 DEG C to 50 DEG C, and the lift-off effect can be well suppressed.

Description

[0001] Technical field: [0002] The invention relates to a non-ferrous metal conductivity measurement technology, and further relates to an eddy current conductivity measurement sensor. [0003] Background technique: [0004] In recent years, with the rapid development of industry and electronics industry, non-ferrous metal materials are very important for the development of industry. Electrical conductivity is an important physical parameter of metal materials, which is closely related to the composition, heat treatment state, hardness and temperature of the metal. In 1873, Maxwell summed up the electromagnetic equations, based on this equations, in the 1960s, German scientists successfully measured the conductivity of non-ferrous metals with the method of eddy current. Compared with other methods, the eddy current method has the advantages of high sensitivity, easy coupling, and fast response. [0005] Currently, most eddy current conductivity measurements use a single-fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02G01N27/04
Inventor 赵友全何峰刘潇江磊翟瑞伟徐巧艳
Owner TIANJIN UNIV
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