Portable alternating field measuring instrument based on magnetostriction principle

A magnetostrictive and alternating magnetic field technology, applied in the direction of the size/direction of the magnetic field, can solve the problems of Hall-type temperature stability, insufficient signal sensitivity, and inability to carry it around, and achieve a wide measurement range and overcome poor temperature stability. , easy to carry effect

Inactive Publication Date: 2011-04-13
SHANGHAI JIAOTONG UNIV
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a portable alternating magnetic field measuring instrument based on the principle of magnetostriction in view of the deficiencies of the prior art, which can reduce the size to millimeter level, has good sensitivity and good Excellent temperature stability and large measurement range, overcome the problems of existing coil type size and insufficient signal sensitivity, and at the same time solve the defects of poor temperature stability and small measurement range of Hall type, and solve the problem that the general alternating magnetic field measuring instrument must The problem with being powered by a cable or not being portable

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
  • Portable alternating field measuring instrument based on magnetostriction principle
  • Portable alternating field measuring instrument based on magnetostriction principle
  • Portable alternating field measuring instrument based on magnetostriction principle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The embodiments of the present invention will be described in detail below with reference to the drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation modes and specific operation procedures are given, but the protection scope of the present invention is not limited to the following Mentioned examples.

[0019] Such as Figure 1-2 As shown, this embodiment includes a magnetostrictive alloy rod 1, a measuring instrument housing 2, an elastic body 3, a piezoelectric sheet 4, a conductive sheet 5, a contact ring 6, and a measurement display circuit 7.

[0020] At least one magnetostrictive alloy rod 1 is connected to the piezoelectric sheet 4 through an elastic body 3. The conductive sheet 5 is joined under the piezoelectric sheet 4 and then installed in the measuring instrument housing 2 together, but the magnetostrictive alloy rod 1 To be exposed to the air. The contact ring 6 is fixed on the ...

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

No PUM Login to view more

Abstract

The invention relates to a portable alternating magnetic field measuring instrument based on a magnetostrictive principle in the technical field of mensuration. The portable alternating magnetic field measuring instrument comprises: at least one magnetostrictive alloy bar is connected with a piezoelectric sheet by an elastomer; a conductive sheet is jointed with the underside of the piezoelectricsheet; the magnetostrictive alloy bar is exposed in air; a contact ring is fixed on the bottom of the a shell of the measuring instrument; exit sides of the conductive sheet are connected and communicated with conducting wires of the bottom of the shell of the measuring instrument respectively; the conducting wires are contacted with two contact rings respectively; a voltage signal wire is led out from the contact ring and is connected with a measuring display circuit; the measuring display circuit consists of a voltage amplifier and a controller; an input end of the voltage amplifier is connected with the contact ring; an output end of the voltage amplifier is connected with the controller; and the controller is connected with an A / D conversion module, a power management module, a liquidcrystal display module and a key-press module. The portable alternating magnetic field measuring instrument can reduce dimension to a millimeter level, and has good sensitivity, good temperature stability and large measuring range.

Description

Technical field [0001] The invention relates to an instrument in the technical field of measurement, in particular to a portable alternating magnetic field measuring instrument based on the principle of magnetostriction. Background technique [0002] There are basically two existing methods for measuring alternating magnetic fields. One is to use the induction method to measure the alternating magnetic field (coil type). An alternating current is passed through the Helmholtz coil, and the induced electromotive force generated by the detection coil in the Helmholtz coil is used to calculate the magnetic field strength at a certain point of the Helmholtz coil. When the angle between the normal direction of the detection coil and the axis of the Helmholtz coil is different, the amplitude of the induced electromotive force ε m Also different, its size is proportional to cosθ. Its measuring range can reach 7.96~7.96×10 4 A / m. The other is to use Hall elements to measure alternating...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/02
Inventor 宫延伟吉小军黄峰一阮晓虹
Owner SHANGHAI JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products