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

Laser ultrasonic signal imaging method for elliptical synthetic aperture focusing

A technology of synthetic aperture focusing and laser ultrasound, which is applied in the processing of detection response signals, the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, measurement devices, etc., can solve the problems of inability to synthesize aperture focusing imaging and low imaging efficiency, and achieve suppression The effect of probe coupling, improving calculation efficiency, and reducing defect misjudgment

Active Publication Date: 2021-06-01
NAT INST CORP OF ADDITIVE MFG XIAN
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the low imaging efficiency of the existing ultrasonic synthetic aperture focusing imaging method and the inability to perform synthetic aperture focusing imaging on the defect wave signal of the longitudinal wave component during internal defect detection, the present invention provides an elliptical synthetic aperture focusing imaging method. Laser Ultrasonic Signal Imaging Method

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
  • Laser ultrasonic signal imaging method for elliptical synthetic aperture focusing
  • Laser ultrasonic signal imaging method for elliptical synthetic aperture focusing
  • Laser ultrasonic signal imaging method for elliptical synthetic aperture focusing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0059] The method of the present invention will be further described below in conjunction with the drawings and embodiments.

[0060] This embodiment provides an elliptical synthetic aperture focusing laser ultrasonic signal imaging method, the specific implementation process is as follows figure 1 Shown:

[0061] 1. Obtain the original ultrasonic signal

[0062] The laser ultrasonic testing system was used to carry out the detection experiment of the titanium alloy prefabricated defect test block (the size of the test block was 100×24×3, and three defects were buried inside, and the apertures of each defect were 0.8mm, 0.8mm, 0.8mm, the distance between defect 1 and defect 2 is 20mm, the distance between defect 2 and defect 3 is 30mm, and the burial depth is 1mm), determine the distance D between the excitation probe and the receiving probe in the laser ultrasonic testing system gr =8.2mm, scanning step Δs=0.2mm, sampling frequency: f=125MHz, surface wave velocity C=2.94mm / ...

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 laser ultrasonic signal imaging method based on elliptical synthetic aperture focusing. The method mainly comprises the steps of 1 acquiring an original ultrasonic signal; 2 performing normalization processing on the original ultrasonic signal; 3 performing neighborhood subtraction to obtain a defect echo signal; 4 determining an elliptical cluster boundary; 5 dividing a wave field plane imaging grid; 6 acquiring an actual imaging area; 7 mapping the amplitude of the defect echo signal to an actual imaging area; and 8 carrying out elliptical cluster superposition and focusing imaging. The method is good in imaging effect, good in resolution ratio and simple in algorithm, and effective identification of defect features is realized.

Description

technical field [0001] The invention belongs to the field of laser ultrasonic detection, in particular to a laser ultrasonic signal imaging method with ellipse synthetic aperture focusing. Background technique [0002] Arc welding additive manufacturing technology realizes the low-cost and high-efficiency manufacturing of large aerospace structural parts, which plays a vital role in the development of the aerospace field. The quality control of formed parts plays a decisive factor in the development of arc welding additive manufacturing technology. In the process of arc welding additive manufacturing, the temperature changes rapidly, the molten pool solidifies quickly, and the external environment is affected, and defects such as pores, cracks, and slag inclusions are prone to occur. affect the performance of the product. Therefore, there is an urgent need for a defect detection technology to realize online detection in the arc welding additive manufacturing process and to ...

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): G01N29/44
CPCG01N29/4472
Inventor 赵纪元卢秉恒王彪王琛玮
Owner NAT INST CORP OF ADDITIVE MFG XIAN