A laser ultrasonic nondestructive testing method and system with virtual control of repetition frequency
A repetition frequency, laser ultrasound technology, applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of fixed repetition frequency, time-consuming, difficult to automate adjustment, etc.
Active Publication Date: 2021-07-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Problems solved by technology
However, under the premise that the laser parameters are affected by the system hardware, the repetition rate is relatively fixed and difficult to automatically adjust
At the same time, the detection of structures with different repetition rates is very time-consuming
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[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0060] The object of the present invention is to provide a laser ultrasonic non-destructive testing method and system with virtual control of repetition frequency, by forming virtual guided wave field data excited by different repetition frequencies, to determine the best laser excitation repetition frequency in the damage detection effect, thereby Determine the highest damage imaging resolution, improve the detection rate...
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The invention discloses a laser ultrasonic non-destructive testing method and system for virtual control of repetition frequency. The method includes: using a laser ultrasonic system to scan the structure under test to obtain guided wave field data excited by a low repetition rate; reconstructing a guided wave excited by a virtual repetition rate according to the guided wave field data excited by a low repetition rate wave field data; according to the guided wave field data excited by the virtual repetition rate, calculate the damage images excited by different repetition rates; determine the repetition frequency of the laser excitation with the best detection effect according to the damage image; according to the best detection effect Optimal laser excitation repetition rate for non-destructive testing. The invention determines the best laser excitation repetition frequency in the damage detection effect by forming virtual guided wave field data excited by different repetition frequencies, thereby determining the highest damage imaging resolution and improving the detection rate and detection effect.
Description
technical field [0001] The invention relates to the technical field of ultrasonic nondestructive testing, in particular to a laser ultrasonic nondestructive testing method and system for virtual control of repetition frequency. Background technique [0002] In the field of aerospace, the safety and reliability of aircraft structure is the key to avoid aerospace accidents. Non-destructive testing technology is often used in the detection of aircraft structure, and ultrasonic testing is one of the non-destructive testing technologies. Ultrasonic testing is to use ultrasonic transducers based on piezoelectric materials to excite and sense longitudinal waves in structures, and to determine the size and location of damage by analyzing the arrival time or amplitude information of reflected waves. This type of detection method requires probe contact or close proximity to the structure for scanning. For large-area aerospace structures with complex curved surfaces, if the convention...
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IPC IPC(8): G01N21/17
CPCG01N21/1702G01N2021/1706G01N2021/1748
Inventor 张超季宏丽全栋梁裘进浩张宇鹏周帆
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS