Multi-frequency eddy current testing system and method for evaluating carbon fiber plate defect depth

An eddy current detection and defect depth technology, applied in the direction of material magnetic variables, etc., can solve problems such as limited amount of information, inability to meet the evaluation of defect depth, etc., to reduce noise interference, reduce lift-off interference, and reduce transmission loss.

Inactive Publication Date: 2017-05-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF6 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional eddy current testing technology uses a single frequency to work, and the amount of information obtained is limited, which cannot satisfy the evaluation of defect depth

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
  • Multi-frequency eddy current testing system and method for evaluating carbon fiber plate defect depth
  • Multi-frequency eddy current testing system and method for evaluating carbon fiber plate defect depth
  • Multi-frequency eddy current testing system and method for evaluating carbon fiber plate defect depth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] The solution of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are carried out on the premise of the technical solution of the present invention, and specific implementation schemes and operation processes are provided, but the protection scope of the present invention is not limited to the following examples.

[0042] Such as figure 1 Shown is a structural block diagram of a multi-frequency eddy current testing system for evaluating the depth of a carbon fiber plate defect provided by the present invention. In order to make the above purpose and features of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043]The multi-frequency eddy current detection system used to evaluate the depth of carbon fiber plate defects in the present inventi...

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 discloses a multi-frequency eddy current testing system and method for evaluating carbon fiber plate defect depth. The system comprises a composite-material to-be-tested part, a multi-frequency sine excitation signal generating module, an eddy current sensing unit, a signal processing and separating module, a signal collecting module and a depth inversion module, wherein the eddy current sensing unit comprises a transmission cable, a probe control mechanism, an eddy current excitation coil and an eddy current detecting coil; the signal processing and separating module comprises a pre-amplifier and a multi-frequency detecting signal separating module. The multi-frequency eddy current testing system and method for evaluating the carbon fiber plate defect depth has the advantage that defect size information is obtained by measuring the peak sensing voltage and peak frequency of different-depth defects, and accordingly the defect depth of composite plates can be evaluated.

Description

[0001] Technical field: [0002] The invention relates to the technical field of non-destructive testing of CFRP composite materials, in particular to a multi-frequency eddy current testing system and testing method for evaluating the depth of defects in carbon fiber plates. [0003] Background technique: [0004] Carbon fiber composite material is a new type of structural material that emerged in the mid-1960s. It has superior properties unmatched by other composite materials and has been widely used in civil industry, military, aerospace and other fields. In order to ensure that composite components can meet the requirements of all directions, monitoring the internal quality of composite structures has attracted more and more attention. [0005] At present, the methods for non-destructive testing of CFRP composite materials mainly include: ultrasonic, acoustic resistance, ray and infrared method detection, but these methods have their own shortcomings for the detection of car...

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): G01N27/90
CPCG01N27/90
Inventor 裘进浩季宏丽徐笑娟程军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap