Detectable Depth of Copper, Steel, and Aluminum Alloy Plates with Pulse-Echo Laser Ultrasonic Propagation Imaging System

Abstract

Pulse-echo laser ultrasonic propagation imaging is a nondestructive testing technique developed for composite materials and aluminum alloys used in aerospace. Although this method has been in usage for a considerable time, information of the detectable depth and the relationship between ultrasonic frequencies and the acoustic properties of metals is not readily available. Therefore, we investigate the A-scan and C-scan ultrasonic testing data of aluminum alloy, hot rolled steel, stainless steel, and copper alloy, which are used in aircraft bodies, frameworks, and gas pipelines. Experiments are performed with the pulse-width and excitation laser power fixed at 32 ns and approximately 4 W, respectively. The metal specimens include 24 artificial cylindrical defects with a diameter of 5 mm, located at depths of 1–12 mm on the front surface. The A-scan and C-scan data obtained at room temperature indicate the detectable depth for metals via the pulse-echo laser ultrasonic propagation imaging technique.

A Sensitive Frequency Range Method Based on Laser Ultrasounds for Micro-Crack Depth Determination

“…After that, Hévin [ 11 ] presented that a surface crack was viewed as a low-pass filter when Rayleigh waves interacted with the surface crack and proposed spectral ratios to evaluate crack depth by applying spectral analysis of incident and transmitted waves. Kim [ 12 ] investigated the A-scan and C-scan ultrasonic-testing data of aluminum alloy, hot-rolled steel, stainless steel, and copper alloy by the laser ultrasonic method. The acquired data indicated the detectable depth for metals via the laser ultrasonic technique.…”