Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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 low detection sensitivity, increased probe size, poor consistency, etc., to achieve the effects of improving sensitivity, reducing additional impedance, and reducing loop area

Inactive Publication Date: 2010-04-28
TSINGHUA UNIV
View PDF0 Cites 10 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Giant magneto-impedance effect sensing probe based on flexible circuit board
  • Giant magneto-impedance effect sensing probe based on flexible circuit board
  • Giant magneto-impedance effect sensing probe based on flexible circuit board

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Login to View More

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. The two 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01R33/09
Inventor 庞浩杨钰王赞基
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com