Laser Doppler Vibrometry

Researchers investigating refractory materials at extreme temperatures face a major challenge: accurately capturing mechanical behavior as materials soften, crack, sinter, or undergo phase transformations. However, conventional acoustic sensing methods used in the impulse excitation technique (IET) quickly reach their limits at elevated temperatures because vibration signals weaken while damping effects become increasingly pronounced. Consequently, tracking changes in elastic properties and energy dissipation with precision becomes far more difficult.

To address these challenges, RFDA LT & HT(VP) units can be upgraded with a Laser Doppler Vibrometer (LDV). Unlike traditional electret microphones, which rely on acoustic detection, the LDV uses a non-contact optical approach to directly measure surface vibrations. As a result, the system can deliver accurate and reliable measurements even under conditions where conventional acoustic methods fail. Moreover, this technology represents a significant advancement in high-temperature material characterization because it enables researchers to monitor material behavior continuously and with greater confidence. Ultimately, Laser Doppler Vibrometry opens new possibilities for understanding refractory materials in demanding industrial environments.