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A multi-path ultra-small planar coil signal detection system

A planar coil and signal detection technology, which is applied in the field of detection systems, can solve problems such as large resistance value and difficult vibration of planar coils, and achieve the effect of real-time detection and high sensitivity

Inactive Publication Date: 2018-02-02
程媛
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the planar coil with small inductance value (generally only 1μH), relatively large resistance value and small quality factor is difficult to start vibration, and a multi-channel small planar coil signal detection system is designed.

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  • A multi-path ultra-small planar coil signal detection system
  • A multi-path ultra-small planar coil signal detection system
  • A multi-path ultra-small planar coil signal detection system

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Embodiment Construction

[0018] The multi-channel tiny planar coil signal detection system is composed of three parts: an inductance coil detection circuit, a USB bus interface and a PC. When the sensitive coil fed with the AC excitation signal is close to the conductive material under test, an induced current, namely eddy current, will be generated in the conductive material under test. The alternating magnetic flux generated by the eddy current is opposite to the alternating magnetic flux generated by the AC excitation signal, so that the equivalent impedance z of the sensitive coil changes, and △z can be expressed as the following function: △z=F(σ, μ , f, δ, γ) (1) where: σ, μ are the conductivity and magnetic permeability of the measured conductive material, f is the frequency of the coil excitation signal, and δ is the distance between the coil and the measured conductive material Distance, γ is the size factor of the coil, which is related to the geometric parameters of the coil. The detection ...

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Abstract

In order to solve the problem that the planar coil with small inductance value (generally only 1μH), relatively large resistance value and small quality factor is difficult to vibrate, a multi-channel small planar coil signal detection system based on an improved clapper oscillator circuit was invented. The system adopts time-sharing scanning technology to perform multi-period synchronous frequency measurement on multi-channel signals, and uses usB protocol for data transmission. The test results show that for planar coil arrays with inductance values ​​ranging from 0.5 to 1.77 "H, the detection system can extract inductance change signals of the order of 1 nH, and can complete the detection of 42 planar inductance coil signals within 1 second. The system software part Based on virtual instrument technology, it has flexibility and scalability.

Description

Technical field [0001] The invention relates to a detection system, in particular to a multi-channel micro planar coil signal detection system. Background technique [0002] The eddy current sensor is a non-destructive, non-contact sensor that can be used in non-destructive testing, angle measurement, distance measurement and biomedical testing. For large and complex parts, due to the limitation of its surface morphology and installation conditions, the sensor probe should be flexible and thin, so planar coils made on flexible substrate materials are more and more widely used. Due to the limitations of flexible printed circuit boards and microfabrication process conditions, when the size of the planar coil is small, the inductance value of the coil is small, the resistance value is relatively large, the quality factor Q (Q=ωL / R) of the coil is low, and the coil detection is more difficult. difficulty. Although the inductance value of the coil can be increased by changing t...

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Application Information

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IPC IPC(8): G01D5/243
CPCG01D5/243
Inventor 程媛
Owner 程媛
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