抄録
We performed simulation experiments to detect defects in a vibrating concrete structure by running loads
using a laser differential interferometer. In laser interferometry, it is difficult to acquire vibration
information when the amplitude of the out-of-plane vibration is big enough in comparison to the
working wave length because the interference signals repeat bright and dark as different frequencies of
actual vibrations.
In this paper, we performed interference measurements using scattered light from an inspected object as
a signal and a reference beam to reduce the relative displacement. Our results show that artificial inner
defects in samples under environmental vibration can be detected.
