Non-destructive Measurement Group

Development of SHM using ultrasound

◆Damage detection by ultrasonic propagation imaging

For damage detection of materials and structures, visualized ultrasound propagation data are more useful than waveform data.  We are developing a contact-free nondestructive imaging system, which can easily visualize ultrasound wave propagation on the surface of an arbitrary shaped object, using thermal excitation of ultrasound by laser and its scanning. We are also developing image processing techniques to emphasize signals resulting from defects.

 

Displacement measurement for large-scale structures utilizing image processing techniques

A simple and accurate full-field displacement measurement technique was developed for large-scale structures. The displacement distribution is determined from each single grating image before and after deformation. A sub-millimeter deflection in a 10-meter-long structure was successfully detected through this technique.

Characterization of physical properties of carbon materials

Techniques and instruments for measuring physical properties of carbon materials, such as artificial graphite electrodes and carbon fibers, under some ambiences suited for industrial application are developed. Our targets are the standardization of the characterization procedures and database construction.