Concrete is a mixture of several building materials such as aggregate, cement and water which is widely used in construction. Concrete as a mixed material tends to crack. Cracks in concrete especially in buildings can cause infrastructure losses and disasters for humans. This makes it important in detecting cracks in concrete. One of them is to take advantage of the bending loss of fiber optic. Fiber optic is a transmission line or cable that uses light as a medium for transmitting information. Data retrieval is done by loading 4 models of fiber optic configuration. In the fiber optic sensor crack detection system that affects the cracks are the pressure, the laying of the fiber optic sensor embedded or outside the concrete, the dimensions of the concrete and bending loss. The results showed that Model 3 had the best characteristic values with a range of 0.42 volt, sensitivity 0.221 V/cm and a resolution of 0.045 cm.
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