A BASIC CHARACTERISTIC OF OPTICAL FIBER SENSOR USED FOR MAINTENANCE OF SOIL STRUCTURES

Abstract

Recently, sensors that use an optical fiber have spread in the field of civil engineering. The BOTDR method to use an optical fiber sensor has a characteristic of continuous measurement for along distance. Sod is a soft and heterogeneous material. These features make it difficult to set and use a sensor on soil and maintain its accuracy also affected by grand water.
We carried out three types of experiment, two loading tests, a tensile test and a bending test. In this study, we estimated the conditions for measurement of the deformation of soil structures due to external factors by using an obtained fiber sensor. This paper describes an appropriate sensor structure to be used for soil structures.