High-speed current vortex sensor

An eddy current sensor, high-speed technology, applied in the field of sensors and distance measurement, can solve the problems of inaccurate measurement results, affecting accuracy and resolution, etc., and achieve high-distance measurement, eliminate the effect of parasitic capacitance, and high stability

Inactive Publication Date: 2017-09-01
TIANJIN UNIV
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Problems solved by technology

On the other hand, the probe is connected to the signal processing circuit through a coaxial cable, and the parasitic capacitance of the cable leads to

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Embodiment Construction

[0019] The invention belongs to the field of sensors. Specifically, the present invention relates to an eddy current sensor, in which a highly stable resonant capacitor is connected in parallel at the end of the sensor probe coil, combined with drive cable technology to eliminate the influence of parasitic capacitance between the core wire and the shielding layer, which can achieve high-speed and accurate measurement and long distance measurements.

[0020] The present invention proposes a design for an eddy current sensor. The resonant capacitor is connected in parallel to the sensor probe end, so that the series resistance is zero ohms, so as to improve the frequency response of the sensor; the triaxial cable is used for transmission, and the driving cable technology is combined to eliminate the transmission cable. The influence of parasitic capacitance to improve the accuracy and stability of sensor measurement and increase the measurement distance.

[0021] The technical ...

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Abstract

The invention provides a high-speed current vortex sensor and relates to the field of distance measurement and sensors, wherein the frequency response of the sensor can be improved, and the influence of the parasitic capacitance of a transmission cable can be eliminated. In this way, the measurement precision and the measurement stability of the sensor are improved, and the measurement distance is increased. According to the technical scheme of the invention, the high-speed current vortex sensor comprises a detection coil, a high-stability capacitor and three coaxial cables. The high-frequency alternating current in the coil generates an alternating magnetic field, and also generates a closed induced eddy current in a to-be-measured metal conductor. The induced eddy current acts on the detection coil in turn, so that the characteristic impedance of a resonant LC circuit formed by the detection coil and the high-stability capacitor changes. The change of the characteristic impedance is transmitted to a far end through the three coaxial cables. Therefore, the changed characteristic impedance can be measured at the far end. The high-speed current vortex sensor is mainly applied to distance measurement occasions.

Description

technical field [0001] The invention relates to distance measurement and sensors, in particular to high-speed eddy current sensors. Background technique [0002] The eddy current sensor is a sensor that uses the eddy current effect generated by the alternating magnetic field in the metal conductor to measure. It has the advantages of high sensitivity, non-contact measurement and strong anti-interference ability. It is widely used in displacement, vibration and workpiece damage and Deformation measurement. In actual measurement, the probe is composed of a sensing coil and a casing. The sensing coil and the capacitance in the preamplifier circuit are commonly used to form an LC resonance. The measured information is obtained by measuring the offset of the resonance point. In order to reduce the load of the oscillator, a resistor needs to be connected in series at one end of the LC resonant circuit, so the frequency response of the sensor is generally low, and the bandwidth is...

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Application Information

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IPC IPC(8): G01D5/20
CPCG01D5/2006
Inventor 段发阶黄婷婷蒋佳佳牛广越傅骁
Owner TIANJIN UNIV
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