Method for examining defect in prestressed tendon and apparatus therefor

摘要

A penetrating radiation is used to examine a prestressed tendon in a prestressed concrete. A comparing object is used, whose position and size are known in advance. A magnifying rate of an image size of the comparing object projected on an imaging device is calculated. By using the magnifying rate and by comparing the image sizes of the prestressed tendon and the comparing object projected on the imaging device, the defect size of the prestressed tendon can be figured out.