Unlock instant, AI-driven research and patent intelligence for your innovation.

Metal flux weakening detection method

A magnetic detection and metal technology, applied in the field of metal weak magnetic detection, can solve the problems of low cost, passive detector without terahertz rays, etc., and achieve the effect of avoiding missed detection

Active Publication Date: 2017-03-22
NINGBO YINZHOU CITAI ELECTRONICS TECH CO LTD
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest difficulty at present is that there is no high-power, portable, continuously adjustable and low-cost THz emission source and a filter that meets the practical requirements, and there is no passive detector that can directly detect THz rays at room temperature.

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
  • Metal flux weakening detection method
  • Metal flux weakening detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] This preferred embodiment is a metal magnetic field weakening detection method, which specifically includes the following steps: 1) Obtaining the magnetic field weakening information of the detected area in real time by a plurality of magnetic sensors; wherein, the magnetic sensors are arranged in two columns of j and k, and j Column is closer to the entrance of the detected area than column k;

[0024] 2) The signal collector converts the electrical signal sent by the magnetic sensor into a digital signal;

[0025] 3) the controller calculates the magnetic anomaly gradient data at each detection point of the two columns of magnetic sensors of j and k according to the digital signal described in step 2);

[0026] 4) Compare the summed average S of the magnetic anomaly gradient data difference values ​​of the magnetic sensors in the sam...

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 present invention discloses a metal flux weakening detection method. Magnetic sensors are employed to sense the magnetic field changing of a detected target when the detected target passes through a detection area, and it is distinguished whether the detected target includes a metal object or not through adoption of the principle that the abnormal changing of the detection area magnetic field caused by the metal passing through the detection area; the magnetic sensors are design at two lines to sense the magnetic field intensity from different positions so as to avoid the leak detection caused by the superposition of the object electromagnetic properties at single-direction detection; and moreover, the magnetic sensors do not need excitation source and cannot generate electromagnetic radiation, so that the metal flux weakening detection method is safe.

Description

technical field [0001] The invention relates to a metal weak magnetic detection method. Background technique [0002] At present, the metal detection methods at home and abroad mainly include: electromagnetic induction type, X-ray detection type and microwave detection type. The main equipment includes security X-ray machines, metal security doors, portable handheld metal detectors, desktop metal detectors and other instruments. [0003] Among them, the electromagnetic induction type is the most widely used type in metal detection. The basic principle is to detect metal by detecting the interference of metal to alternating electromagnetic field. However, when there are two or more metals with different magnetic and electrical properties, it is very likely that the induced magnetic fields will cancel each other out, eventually leading to false positives. [0004] The X-ray detection type (such as X-ray luggage security inspection machine) can determine the shape, position, ...

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 Applications(China)
IPC IPC(8): G01V3/08
CPCG01V3/081
Inventor 于润桥夏桂锁胡博程东方程强强
Owner NINGBO YINZHOU CITAI ELECTRONICS TECH CO LTD