A review of optical NDT technologies

Area of Science:

• Materials Science
• Optics
• Engineering

Background:

• Optical non-destructive testing (NDT) is increasingly vital due to its high precision and sensitivity.
• It enables detailed imaging without damaging the material under inspection.

Purpose of the Study:

• To review and summarize major optical NDT technologies.
• To highlight the unique advantages and applications of each technology.

Main Methods:

• Fibre optics: easy integration and embedding.
• Electronic speckle: whole-field high precision detection.
• Infrared thermography: ideal for composite materials.
• Endoscopic technology: direct internal surface imaging.
• Terahertz technology: penetration of non-metallic materials.

Main Results:

• Each technology offers distinct capabilities for material analysis.
• Fibre optics and electronic speckle excel in integration and precision detection.
• Infrared thermography, endoscopy, and terahertz imaging provide unique solutions for internal and composite material assessment.

Conclusions:

• Optical NDT technologies are diverse and advancing rapidly.
• These methods are crucial for modern engineering applications requiring detailed material insights.