This paper reviews recent advances in sensor technologies for non-destructive testing
(NDT) and structural health monitoring (SHM) of civil structures. The article is motivated by …

This paper describes a new methodology for evaluating the crack depth and the crack
opening stress intensity factor of small closed cracks using an ultrasonic technique. Surface …

This paper describes a new methodology for analyzing the closure stress of small fatigue
cracks using ultrasonics. Surface connected back-wall cracks in steel specimens are …

抄録 To evaluate the depth of small fatigue cracks under conditions of no contact and without
using any coupling medium, a novel microwave technique was demonstrated. An open …

抄録 This paper describes an experimental investigation on the ultrasonic nondestructive
evaluation of small cracks in the size range of 0.25 to 3mm. The cracks treated are 0.1 mm …

A microwave method to evaluate the depth of cracks on the metal surface is demonstrated.
An open-ended coaxial line sensor was developed to improve the spatial resolution for …

Closed fatigue cracks on the metal surface were detected successfully by using microwaves.
A W-shaped characteristic signal was obtained utilizing a high spatial resolution sensor …

A unique phenomenon in physics has been revealed. Due to internal mechanical stress and
defects the surface electrical conductivity of metallic objects can be modified. This …

The paper reviews the potential of the ultrasonic small incidence method of testing, which
enables us to characterize smaller tight cracks quantitatively under load-free conditions …

A direct-current potential-drop NDE technique has been developed for the evaluation of a 3-
D back-wall crack in thick-walled structures. The measuring system contains two pairs of …