Non-contact Measurement of Elastic Modulus by using Laser Ultrasonic
http://link.springer.com/article/10.1007/s12541-015-0118-x
Non-contact measurement of elastic modulus by using laser ultrasound
Abstract
Non-contact measurement of elastic modulus is necessary for the in-line assessment of material in harsh environments such as high temperature. In this paper, a fully non-contact method to measure elastic modulus is proposed based on the laser ultrasonic technique (LUT) that uses a short-pulsed laser to generate ultrasound and the other laser coupled to an interferometer using a photorefractive crystal to detect the ultrasonic wave displacement. Basically, this method measures velocities of shear wave and longitudinal wave to obtain the elastic modulus. The uniqueness is that the velocity of shear wave is measured in the thermo-elastic regime first and then the velocity of longitudinal wave is measured in the ablation regime. This is because the strong mode of generated ultrasound is the shear wave in the thermo-elastic regime while the longitudinal wave in the ablation regime. Regime change can be achieved simply by switching the laser power, with no change in the measurement setup. In order to demonstrate the usefulness of the proposed method, the elastic modulus of aluminum casting alloy has been measured and the results were compared with a conventional contact method and a destructive tensile test. They showed good agreement with each other, which verified the usefulness of the proposed noncontact elastic modulus measurement method.
Keywords
Elastic modulus Laser ultrasound Non-contact Non-destructive-
Rapid Molecular Diagnostic Sensor Based on Ball-Lensed Optical Fibers
-
Porosity Evaluation of Additively Manufactured Components Using Deep Learning‑based Ultrasonic Nondestructive Testing (Editor's pick)
-
Plastic properties estimation of aluminum alloys using machine learning of ultrasonic and eddy current data
-
Nonliner Ultrasonic Characterization of fatigue damage in sus316L alloy
-
Nonlinear Ultrasonic Techniques for Nondestructive Assessment of Micro Damage in Material : Review
-
Nonlinear Ultrasonic Method to Detect Micro-delamination in Electronic Packaging
-
Nonlinear ultrasonic characterization of thermal degradation in ferritic 2.25Cr-1Mo steel
-
NONLINEAR BEHAVIOR OF ULTRASONIC WAVE AT CRACK
-
Nondestructive Inspection of Directed Energy Deposited Components Using Scanning Acoustic Microscopy with Metalworking Fluids
-
Nondestructive Inspection of Cylindrical Components Repaired Via Directed Energy Deposition Using Scanning Acoustic Microscopy with Metal Lubricants
-
Nondestructive Evaluation of Thermal Aging in Al6061 Alloy by measuring Acoustic Nonlinearity of Laser-generated Surface Acoustic Waves
-
Nondestructive evaluation of micro-oxide inclusions in additively manufactured metal parts using nonlinear ultrasonic technique
-
Non-contact Single-Mode Guided Wave Technique by the Combination of Wavelength-Matched Laser Generation and Angle-Matched Leak Wave Detection
-
Non-contact Measurement of Elastic Modulus by using Laser Ultrasonic
-
Non-Contact Evaluation of Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy
-
NDE of low-velocity impact damages in composite laminates using ESPI, digital shearography and ultrasound C-scan techniques
-
Nanotribological and wetting performance of hierarchical patterns
-
Microstructural Characterization of Additively Manufactured Metal Components Using Linear and Nonlinear Ultrasonic Techniques
-
Mechanical properties estimation of additively manufactured metal components using femtosecond laser ultrasonics and laser polishing
-
Measurement of Absolute Acoustic Nonlinearity Parameter Using Laser-Ultrasonic Detection