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Giant magneto-impedance effect sensing probe based on flexible circuit board

A flexible circuit board and giant magneto-impedance technology, applied in the field of magnetic field detection, can solve the problems of increasing probe size, poor consistency, and low detection sensitivity, and achieve the effect of reducing additional impedance, improving sensitivity, and good anti-interference ability.

Inactive Publication Date: 2011-11-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wires of the existing sensing probes are directly connected to both ends of the alloy wire, that is, the measured impedance includes both ends of the wire, so the detection sensitivity is low
To improve the detection sensitivity, it is necessary to increase the ratio of the length of the alloy wire to its diameter, which will increase the probe size
At the same time, the existence of the end effect also makes the resistance change characteristics of the alloy wire change slightly when the size of the alloy wire changes slightly, and the consistency of the probe during production and processing is poor.

Method used

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  • Giant magneto-impedance effect sensing probe based on flexible circuit board
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  • Giant magneto-impedance effect sensing probe based on flexible circuit board

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Embodiment Construction

[0013] The bottom surface and the front circuit diagram of the double-layer flexible circuit board adopted in a specific embodiment of the present invention are respectively as follows image 3 and Figure 4 shown. The flexible circuit board has a thickness of 130 μm, a length of 12 mm, and a width of 6 mm. The disk marked 0 is a via hole, which connects the upper and lower wires at one end. The discs marked 1 and 2 are pads with two wires at the other end, and the double-strand wires are soldered to these two pads and then lead out. The circular hole marked with 3 is a threading hole reserved for the twin-strand wire. The wires on the front circuit board are disconnected through the strip-shaped pads 4 and 5, and the gap width between the two pads is 1mm. On the bottom surface and the front surface of the circuit board, there are two marking lines perpendicular to the two sides of the gap, and the marking lines are used to mark the magnetic field detection points. Co wit...

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Abstract

The invention discloses a giant magneto-impedance effect sensing probe based on a flexible circuit board. The sensing probe belongs to the technical field of magnetic field detection and is characterized in that the probe uses a double-layer flexible circuit board comprising two coincident straight wires with a longer length than an end effect critical length of a magnetic alloy wire or belt. Thetwo wires are in short connection through vias at one end, and the other end of each wire leads out a twin conductor by means of a bonding pad to provide a sensing signal. One wire is disconnected for a certain gap in the middle, and the middle section of a magnetic alloy wire or a magnetic alloy belt is accessed on two bonding pads at the two sides of the gap by constant temperature welding spots. The magnetic alloy wire or belt is straightened along the wire direction and attached on the surface of the flexible circuit board by virtue of an inviscid insulating film, and is fixed by a viscous insulating film to constitute the integral sensing probe. The sensing probe has a sensitive giant magneto-impedance effect within 10MHz to 30MHz, and the machined probe has consistent measuring properties and is strong in anti-interference performance when in application.

Description

technical field [0001] The invention relates to a giant magneto-impedance effect sensing probe based on a flexible circuit board. The probe is placed in a detected magnetic field, and the electrical characteristics of the two ends of the lead-out line change with the external magnetic field to show the variation characteristics of giant magneto-impedance. The invention belongs to the technical field of magnetic field detection. Background technique [0002] The phenomenon that the AC impedance value of magnetic alloy wire or magnetic alloy ribbon made of amorphous or nanocrystalline alloy material changes significantly with the change of external magnetic field within a certain frequency range is called the giant magnetoimpedance effect. The giant magneto-impedance effect makes it possible to develop new types of small-volume, high-sensitivity magnetic detection devices. [0003] An article titled "Accelerometer Using MI Sensor (Accelerometer Using MI Sensor)" was published...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/09
Inventor 庞浩杨钰王赞基
Owner TSINGHUA UNIV
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