Fixed-frequency AM electric vortex displacement sensor probe 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, can solve problems such as difficulty in guaranteeing, poor temperature characteristics and stability, and achieve high mechanical strength and stable resistivity. Effect

Inactive Publication Date: 2007-07-18
SHANGHAI CHIJIE ELECTRONICS
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  • Claims
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Problems solved by technology

[0004] However, the main disadvantage of the eddy current sensor probe made by the traditional process is poor temperature characteristics and stability
It is difficult to guarantee the precision and accuracy of the eddy current sensor probe measurement under the condition of large temperature difference

Method used

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

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Embodiment Construction

[0029] Please refer to the accompanying drawings for a further description of the present invention.

[0030] The present invention provides a fixed-frequency amplitude modulation eddy current displacement sensor probe with linear automatic compensation, which includes a skeleton body 3, a coil 2, a protective cover 1, a housing 4 and a coaxial cable 5, and the coil is a 2-palladium-silver alloy Wire.

[0031] The palladium-silver alloy wire has a wire diameter of 0.11-0.34mm, a resistivity of 0.6-3.5Ω / m, and a temperature coefficient of resistivity of within 50ppm / °C.

[0032] The formula ratio of the palladium-silver alloy wire is: palladium 75-85%, silver 15-25%. Palladium and silver are adjacent elements on the periodic table, and their atomic weights are very close. They can be well fused together after being smelted at a high temperature of 800°C. The smelted palladium-silver alloy block is cold-drawn by a wire drawing machine, the uniformity of the wire diameter is wi...

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Abstract

The invention relates to linear auto-compensation fixed frequency amplitude modulation electrical eddy current displacement transducer probe. It includes framework, coil, protecting case, shell, and coaxial cable. The coil is formed by palladium-silver wire with 75-85% palladium and 15-25% silver which are melted at 800 degree centigrade, take shape by cold drawing, has 0.11-0.34mmlinear diameter, 0.6-3.5ohm/m resistivity, 50ppm/degree centigrade resistivity temperature coefficient. The palladium-silver wire has stable resistivity, thus the quality factor Q of the probe can keep stable in big temperature difference range. The linear diameter is confirmed according to skin effect which can automatically compensate its resistivity change caused by temperature.

Description

technical field [0001] The invention relates to an eddy current displacement sensor probe, in particular to a linear automatic compensation fixed frequency amplitude modulation type eddy current displacement sensor probe. Background technique [0002] The eddy current probe is a coil fixed on the skeleton, which forms a three-point oscillation drop of the capacitor with two capacitors and a triode. In the absence of a measuring body, the loop is tuned to a certain frequency (eg 1 MHz). When the measured conductor is close to the sensor, due to the excitation of the high-frequency signal contained in the sensor coil, a high-frequency alternating magnetic field φi is generated. According to the law of electromagnetic induction, an electric current connected with the alternating magnetic field is generated near the surface of the measured conductor. Eddy current, this eddy current will generate a magnetic field φe to react to φi, and there is a certain phase difference Δφ betw...

Claims

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Application Information

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Patent Type & Authority Applications(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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