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Fixed-frequency AM electric vortex displacement sensor of linear automatic compensation

A displacement sensor and automatic compensation technology, which is applied in the direction of transmitting sensing components, instruments, circuits, etc. by using electric/magnetic devices, to achieve the effect of ensuring accuracy and highlighting temperature compensation characteristics

Inactive Publication Date: 2008-12-10
SHANGHAI CHIJIE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it did not fundamentally solve the stability and nonlinear problems of the sensor

Method used

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  • Fixed-frequency AM electric vortex displacement sensor of linear automatic compensation
  • Fixed-frequency AM electric vortex displacement sensor of linear automatic compensation
  • Fixed-frequency AM electric vortex displacement sensor of linear automatic compensation

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Embodiment Construction

[0054] Please refer to the accompanying drawings for a further description of the present invention.

[0055] Such as figure 1 As shown, the present invention provides a linear automatic compensation fixed frequency amplitude modulation eddy current displacement sensor. Including eddy current probe 1, coaxial cable 2 and preamplifier circuit 3, the probe 1 is connected to the coaxial cable 2, the palladium-silver alloy coil in the probe 1 generates high-frequency current, and the temperature compensation circuit is used to compensate the probe 1 and the coaxial Temperature drift error of cable 2.

[0056] Such as Figure 5 As shown, the eddy current probe 1 is composed of a probe coil 12 , a skeleton body 13 , a protective cover 11 , a stainless steel shell 14 , and a coaxial cable 2 . The probe coil 12 is made of palladium-silver alloy wire, and the formula ratio of the palladium-silver alloy wire is 75-85% of palladium element content and 15-25% of silver element content....

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Abstract

The invention relates to linearity auto-compensation fixed frequency amplitude modulation electrical eddy current displacement transducer. It includes probe, coaxial cable, and preamplifier circuit. The coil of the probe adopts palladium-silver enameled wire. The coaxial cable structure includes inner conductor, inner insulating layer, inner shielding layer, isolating layer, outer shielding layer and isolating protective sleeve. The inner conductor is formed by many Mn, Cu, and Ag alloy wires. Inner and outer shielding layers are formed by gold-plate copper wire net. The others are made by polytetrafluoroethylene. The preamplifier circuit includes high frequency oscillating circuit, linearity compensation circuit, high frequency oscillating control circuit, linearity correcting circuit, detection circuit, filter circuit, temperature compensation circuit, amplification circuit, and follower. The invention has outstanding temperature compensation character, can ensure transducer precision in big temperature difference range by stabilizing its non-linear degree in small area.

Description

technical field [0001] The invention relates to a fixed frequency amplitude modulation type eddy current displacement sensor, in particular to a fixed frequency amplitude modulation type eddy current displacement sensor capable of linear automatic compensation. Background technique [0002] The eddy current sensor adopts the principle of induced eddy current. When the coil with high-frequency current is close to the metal to be tested, the high-frequency electromagnetic field generated by the high-frequency current on the coil will generate an induced current on the metal surface, which is called in electromagnetism. for eddy currents. The eddy current is related to the distance between the metals to be tested and parameters such as electrical conductivity, magnetic permeability, geometric shape, geometric size, and current frequency of the coil. Through the conditioning circuit, the distance between the eddy current probe and the metal surface to be tested can be linearly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/02G01D5/12G01D5/14H01B11/18H01B13/016H01B1/02H01B3/00H01B3/44
Inventor 朱杰朱久阔李定飞黄小丽
Owner SHANGHAI CHIJIE ELECTRONICS
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