The invention relates to a distributed crack sensor based on a
coaxial cable, belonging to the technical field of an
engineering structure
safety monitoring. The distributed crack sensor provided by the invention is characterized in that a
metal conductor core on the inner layer, an insulating layer in the middle, the
metal conductor layer provided with a weak link (such as sunk weak threads, dot mode weak threads and the like) and a surface anticorrosive material are sequentially arranged from inside to outside; the weak threads are machined by applying the rotation advancing traction to the
coaxial cable and simultaneously utilizing a
drill to carve grooves on an outer conductor layer or utilizing a puncher to continuously punch on the outer conductor layer; the depth and
pitch of the weak threads select different numerical values according to the requirements of the structure on the
test sensitivity and the
space resolution; and when cracks are monitored, the attenuation signals which are generated because of the crack modulation of the
coaxial cable are obtained through an electric
time domain reflectometer to determine the occurrence position and expansion degree of the cracks. The sensor provided by the invention has the beneficial effects that the sensor is a coaxial cable distributed crack sensor provided with weak threads, the structure is simple, the durability is good, the crack monitoring scale is large, and a structural damage memory function is achieved.