Mid-infrared pulsed laser ultrasonic testing for carbon fiber reinforced plastics

作者：Kusano Masahiro^*; Hatano Hideki; Watanabe Makoto; Takekawa Shunji; Yamawaki Hisashi; Oguchi Kanae; Enoki Manabu

来源：Ultrasonics, 2018, 84: 310-318.

DOI：10.1016/j.ultras.2017.11.015

• Wavelength conversion
• Mid-IR laser
• Laser ultrasonic testing
• Carbon fiber reinforced plastics

Laser ultrasonic testing (LUT) can realize contactless and instantaneous non-destructive testing, but its signal-to-noise ratio must be improved in order to measure carbon fiber reinforced plastics (CFRPs). We have developed a mid-infrared (mid-IR) laser source optimal for generating ultrasonic waves in CFRPs by using a wavelength conversion device based on an optical parametric oscillator. This paper reports a comparison of the ultrasonic generation behavior between the mid-IR laser and the Nd: YAG laser. The mid-IR laser generated a significantly larger ultrasonic amplitude in CFRP laminates than a conventional Nd: YAG laser. In addition, our study revealed that the surface epoxy matrix of CFRPs plays an important role in laser ultrasonic generation.

• 出版日期2018-3