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All-optical laser-ultrasonic technology for width and depth gauging of rectangular surface-breaking defects.

Cheng Chen¹, Bing-Feng Ju¹, Xiaoyu Yang¹

¹State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, People's Republic of China.

The Review of Scientific Instruments

|July 10, 2021

Summary

An all-optical laser-ultrasonic system accurately measures rectangular surface defects. This novel three-step method uses Rayleigh waves to determine defect width and depth, validated by experimental results.

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Area of Science:

Non-destructive testing
Optical metrology
Ultrasonic testing

Background:

Surface-breaking defects pose challenges in structural integrity assessment.
Accurate characterization of defect dimensions is crucial for material safety.
Conventional methods may lack precision or require direct contact.

Purpose of the Study:

To develop and validate an all-optical laser-ultrasonic system for gauging rectangular surface defects.
To propose a novel three-step detection method for simultaneous width and depth measurement.
To investigate the behavior of Rayleigh waves interacting with surface defects.

Main Methods:

Utilized an all-optical laser-ultrasonic system for defect characterization.
Employed the finite element method to simulate Rayleigh wave propagation and interaction with defects.
Developed a three-step laser irradiation and detection protocol.
Correlated wave arrival times and sample movement with defect dimensions.

Main Results:

Successfully gauged the width and depth of rectangular surface-breaking defects.
Observed distinct reflection and transmission patterns of Rayleigh waves based on their wavelengths relative to defect depth.
Experimental measurements showed strong agreement with digital microscope results.
Validated the feasibility of the proposed three-step method for simultaneous defect dimension measurement.

Conclusions:

The all-optical laser-ultrasonic system and proposed method offer a viable approach for non-destructive defect characterization.
The technique demonstrates potential for application to various defect geometries.
This optical method provides precise and non-contact measurement capabilities.