Abstract: The use of portable and high-energy x-ray system can provide a very promising approach for the inspection of aged concrete structures. However, due to the effect of large scattering of low-energy x-ray in a thick concrete, the noise properties and contrast of the radiographic images need to be optimized to ensure reliable interpretation. Therefore, in order to improve the inspection ability, an image denoising method with the combination of wavelet and curvelet transform and image contrast e...
英字タイトル:
Image Enhancement for Concrete Bridge Inspection with Portable 950 keV/ 3.95 MeV X-ray Source

Abstract: A hybrid, noncontact laser-EMAT ultrasonic system, using a pulsed laser for ultrasound generation and an EMAT (electromagnetic acousti c transducer) for ultrasound detection, is developed and studied on NDT of crack in materials. Instead of using longitudinal diffraction wave i n the conventional TOFD method, the LTS mode-converted wave scattered from the crack tip is recommended to be applied in the laser-EMAT TOFD mea surement. A modified time-of-flight (TOFD) method based on laser-EMAT ultraso...
英字タイトル:
Laser-EMAT ultrasonic testing of cracks with TOFD method

Abstract: In this work, a FEM (finite element method) simulation program was used in the residual stress measurement with acoustic wave. The possibility of assessing the residua l stress, by using an EMAT (electromagnetic acoustic transducer) receiver for precise me asurement of the acoustoelstic effect on LCR wave, was investigated by simulation method....
英字タイトル:
Numerical Simulation of Residual Stress Measurementwith Acoustic Wave