Vibrothermography Technique for Non-Destructive Testing

Abstract

Ultrasonic thermography, also known as sonic infrared imaging, is a promising technique that excites ultrasonic elastic waves and is commonly used in the automotive and aerospace sectors to detect and evaluate flaws in solid specimens. This method employs ultrasound-generated thermal waves to enable defect-specific imaging. The present paper reviews new findings and significant advancements in ultrasonic thermography. The paper is structured as follows: an introduction to ultrasonic thermography is first provided, followed by a discussion on improvements made to enhance the reliability of vibrothermography. Next, an analytical study of different excitation methods and structural parameters is presented, along with an examination of the effects of various excitation parameters on the system's performance. Subsequently, a vibration monitoring method is introduced. Finally, the key causes of heat generation in this technique, along with analytical approaches, critical factors, and limitations in vibrothermography, are discussed.