Sample interview questions: Describe the principles behind laser-induced acoustic imaging and its applications in structural analysis.
Sample answer:
Principles of Laser-Induced Acoustic Imaging
Laser-induced acoustic imaging (LAI) is a non-destructive evaluation technique that utilizes the generation and propagation of acoustic waves to visualize the internal structure of materials. The process involves:
- Using a pulsed laser to generate a localized thermal stress on the material’s surface.
- The thermal stress creates an acoustic wave that propagates through the material.
- The acoustic wave interacts with internal defects and boundaries, causing reflections and scattering.
- The reflected and scattered acoustic waves are detected using an ultrasonic transducer.
By analyzing the acoustic wave patterns, the internal structure of the material can be reconstructed, revealing defects, cracks, and other irregularities.
Applications in Structural Analysis
LAI has numerous applications in structural analysis, including:
- Defect Detection: Identifying and characterizing defects such as cracks, voids, and delamination in structures made of metals, composites, and ceramics.
- Corrosion Mapping:<... Read full answer