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Ultrasonic time-of-flight diffraction method by cylinder focusing wedge

A diffraction time difference method and wedge block technology, which is applied to the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve problems such as the need to improve the detection sensitivity and the low energy level of the diffraction signal, and achieve the effect of improving the identification ability and avoiding the missed detection of defects.

Inactive Publication Date: 2012-06-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing diffraction time-of-flight method detects defects, the energy level of the diffraction signal is low, and the detection sensitivity needs to be improved, and to provide an ultrasonic diffraction time-of-flight method for cylindrical focusing wedges

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  • Ultrasonic time-of-flight diffraction method by cylinder focusing wedge
  • Ultrasonic time-of-flight diffraction method by cylinder focusing wedge
  • Ultrasonic time-of-flight diffraction method by cylinder focusing wedge

Examples

Experimental program
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specific Embodiment approach 1

[0042] Specific implementation mode 1: Combination figure 1 with figure 2 To describe this embodiment, the specific steps included in this embodiment are as follows:

[0043] Step 1. Determine the known conditions: the diameter of the probe wafer, the longitudinal wave speed of the wedge, the longitudinal wave sound speed of the tested workpiece, and the longitudinal wave sound speed in water;

[0044] Step 2. Set the required conditions: the water path of the spindle sound beam, the refraction angle of the longitudinal wave in the tested workpiece, and the vertical depth of focus of the spindle sound beam in the workpiece;

[0045] Step 3: Calculate the radius of curvature of the wedge cylinder according to the above conditions:

[0046] The incident angle of the sound beam emitted by the probe on the curved surface is i 1 , The refraction angle after curved surface refraction is r 1 , Stipulating the refraction angle β of the sound beam at the interface between the water and the te...

specific Embodiment approach 2

[0077] Specific embodiment 2: This embodiment adopts the technical scheme of specific embodiment 1, and experiments are carried out in combination with a specific environment to illustrate the effect of the present invention. The aluminum alloy plate with a thickness of 10.5 mm is used as the detection object, and the wedge is made of organic glass:

[0078] Step 1. Determine the known conditions: probe wafer diameter d=6mm, plexiglass longitudinal wave sound velocity v Plexiglass =2730m / s, the longitudinal wave sound velocity of the tested workpiece v aluminum =6260m / s, longitudinal wave sound velocity in water v water =1480m / s;

[0079] Step two, set the required conditions: the spindle sound beam water path OP=1.5mm, the longitudinal wave refraction angle θ=60° in the inspected workpiece, and the focal depth of the spindle sound beam in the workpiece h=5.3mm;

[0080] Step 3: Calculate the radius of curvature of the wedge:

[0081] The incident angle of the sound beam emitted by ...

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Abstract

An ultrasonic time-of-flight diffraction method by a cylinder focusing wedge relates to the field of ultrasonic detection and solves the problem that an existing time-of-flight diffraction method for detection is low in energy level of defective diffraction signals and needs improvement of detecting sensitivity. The ultrasonic time-of-flight diffraction method includes the specific steps: firstly, determining known conditions including the diameter of a probe wafer, the longitudinal wave velocity of the wedge, the longitudinal wave velocity of a detected workpiece and the velocity of longitudinal waves in water; secondly, setting needed conditions including the water path of an acoustic beam of a spindle, the refraction angle of longitudinal waves in the detected workpiece and the focusing vertical depth of the acoustic beam of the spindle in the workpiece; and thirdly, computing the curvature radius of a cylinder of the wedge according to the conditions and detecting by the ultrasonic time-of-flight diffraction method through the manufactured cylinder focusing wedge. The ultrasonic time-of-flight diffraction method is used for ultrasonic detection.

Description

Technical field [0001] The invention relates to the field of ultrasonic detection. Background technique [0002] The ultrasonic diffraction time difference method has been widely used in the inspection of thick-wall welds. Since the time-of-flight diffraction method is based on receiving weak diffracted waves at the end of the defect, the inspection equipment needs to work under relatively high gain conditions. The high gain working state will bring system noise interference to the echo signal, such as electrical noise. At the same time, the anisotropic structure of the weld zone will also bring stronger structural noise, which increases the difficulty of defect identification. In addition, the high-gain operating state by simply increasing the ultrasonic pulse transmission power will cause the range resolution to decrease. The above-mentioned problem is one of the technical drawbacks of the conventional time-of-flight diffraction method, which largely limits the popularizatio...

Claims

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Application Information

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IPC IPC(8): G01N29/06
Inventor 迟大钊刚铁赵立彬陈嘉玥
Owner HARBIN INST OF TECH
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