The cables in anchorage zone of cable-stayed bridge are hidden within the embedded pipe, which leads
to the difficulty for detecting the damage of the cables with visual inspection. We have built a detection
device based on high-resolution video capture, realized the distance observing of invisible segment of
stay cable and damage detection of outer surface of cable in the small volume. The system mainly
consists of optical stents and precision mechanical support device, optical imaging system, lighting
source, drived motor control and IP camera video capture system. The principal innovations of the
device are ⑴A set of telescope objectives with three different focal lengths are designed and used in
different distances of the monitors by means of converter. ⑵Lens system is far separated with lighting
system, so that the imaging optical path could effectively avoid the harsh environment which would be
in the invisible part of cables. The practice shows that the device not only can collect the clear
surveillance video images of outer surface of cable effectively, but also has a broad application
prospect in security warning of prestressed structures.
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