Leakage Detection Method for Composite Material Components Based on Air-Coupled Ultrasonic Technology

By combining air-coupled ultrasonic technology with inert high-density gas replacement, the problems of accuracy and non-destructive testing of defects and leaks in composite material components have been solved, achieving efficient and low-cost testing results.

CN120846597BActive Publication Date: 2026-07-17SHANGHAI AIRCRAFT MFG
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI AIRCRAFT MFG
Filing Date
2025-04-16
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies struggle to accurately and completely non-destructively detect defects and leaks in composite material components with cavities, especially hidden gap and pinhole opening defects in honeycomb sandwich structures. Traditional detection methods are complex and have negative impacts on the components.

Method used

Air-coupled ultrasound technology is used in combination with air replacement by inert high-density gas. By performing two ultrasonic scans in an atmospheric environment and an inert high-density gas environment, the changes in the acoustic coupling characteristics of the inert high-density gas in the defect area are utilized to reveal high-attenuation areas to indicate the leak point.

Benefits of technology

It achieves completely non-destructive, highly sensitive and accurate defect and leak detection, reducing detection costs and complexity, and improving detection efficiency.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN120846597B_ABST
    Figure CN120846597B_ABST
Patent Text Reader

Abstract

This invention discloses a leak detection method for composite material components with cavities based on air-coupled ultrasonic technology. The method includes: scanning the component under test using air-coupled ultrasonic technology in an atmospheric environment to acquire a first ultrasonic scan image; placing the component under test in an atmosphere filled with an inert high-density gas; removing the component from the atmosphere and scanning it again in an atmospheric environment using air-coupled ultrasonic technology to acquire a second ultrasonic scan image; and comparing the second ultrasonic scan image with the first ultrasonic scan image to check whether the second ultrasonic scan image shows additional high-attenuation areas. This invention enables defect and leak detection in composite material components with cavities in a completely non-destructive manner in a dry environment, significantly improving leak detection efficiency.
Need to check novelty before this filing date? Find Prior Art