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Eddy current displacement sensor linearization method based on inverse function piecewise correction and eddy current displacement sensor using method

A displacement sensor and linearization technology, applied in the direction of instruments, electric devices, electromagnetic means, etc., can solve the problems of resistance and difficulties that are not easy to match the resonant circuit, and achieve the effect of low cost, simple operation and stable performance

Active Publication Date: 2021-08-03
ZHEJIANG UNIV
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Problems solved by technology

The first method is more difficult to implement, and it is not easy to match the resistance of the resonant circuit. The second method can achieve better results, but most of the current linearization circuits contain more diodes, transistors and other non-linear components that are easily affected by temperature. components, there are still defects

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  • Eddy current displacement sensor linearization method based on inverse function piecewise correction and eddy current displacement sensor using method
  • Eddy current displacement sensor linearization method based on inverse function piecewise correction and eddy current displacement sensor using method
  • Eddy current displacement sensor linearization method based on inverse function piecewise correction and eddy current displacement sensor using method

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[0038] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] The invention provides a linearization method of an eddy current displacement sensor based on an inverse function segmental correction, and the specific steps are as follows:

[0040] Step (1): measure the characteristic curve U=f(d) of the displacement d-voltage U of the eddy current displacement sensor, determine the linear interval starting point d of the displacement-voltage characteristic curve according to the U=f(d) image 0 and interval length Δd. Let the starting point of the linearization processing interval be the starting point of the linear interval of the displacement-voltage characteristic curve d 0 , the length of the linearization processing interval is m times the length mΔd of the linear interval of the displacement-voltage chara...

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Abstract

The invention discloses an eddy current displacement sensor linearization method based on inverse function piecewise correction and an eddy current displacement sensor using the method. The linearization method is based on the input-output characteristics of the eddy current displacement sensor before linearization processing, and utilizes the inverse function piecewise correction method. A linearization circuit based on inverse function piecewise correction is designed, and the linearization circuit is connected to the output end of the eddy current displacement sensor in series, so that the input-output characteristics of the eddy current displacement sensor can be linearized; the eddy current displacement sensor comprises an eddy current sensor probe, a front-end device and a linearization circuit based on inverse function piecewise correction. An output signal obtained after the linearization circuit based on inverse function piecewise correction carries out linearization compensation on the output signal of the eddy current displacement sensor is in a linear relation with the displacement signal. The method not only improves the linearity of the input-output characteristic of the eddy current displacement sensor, but also expands the linear measurement range.

Description

technical field [0001] The invention belongs to the technical field of eddy current displacement measurement, and in particular relates to a linearization method of an eddy current displacement sensor based on an inverse function segment correction and an eddy current displacement sensor using the method. Background technique [0002] The eddy current displacement sensor has been widely used in displacement measurement in various industries due to its non-contact, convenient long-distance transportation, high sensitivity, simple structure, and not affected by non-metallic materials. The eddy current displacement sensor converts the electrical parameters between the probe coil and the measured material, such as impedance, inductance and quality factor, into electrical signals for output through the electromagnetic coupling between the probe coil and the measured material. It generally consists of probes, high-frequency cables and front-end devices. [0003] The output voltag...

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Application Information

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IPC IPC(8): G01B7/02G01B21/04
CPCG01B7/02G01B21/045
Inventor 祝长生左子昭
Owner ZHEJIANG UNIV
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