Inclinometer for Underground using Optical Fiber Sensors and Method for Measuring Inclining Angle of Underground using such Inclinometer

摘要

The present invention relates to an underground inclination measuring device and an underground inclination measuring method using the same. According to the present invention, the underground inclination measuring device includes a two-way coupler (13), upper and lower joints (11, 12), and a center weight (14). The two-way coupler (13) is connected to a lower end of an upper joint (11) to rotate. An upper end of the lower joint (12) is connected to the two-way coupler (13). A pair of first upper rotation pins (18a) and a pair of second upper rotation pins (18b) are installed in the upper joint (11) to rotate by individually facing each other. A pair of first lower rotation pins (19a) and a pair of second lower rotation pins (19b) are installed in the lower joint (12) to rotate by individually facing each other. A first-axis optical fiber sensor (151) is installed between the first upper rotation pin (18a) and the first lower rotation pin (19a), and a second-axis optical fiber sensor (152) is installed between the second upper rotation pin (18b) and the second lower rotation pin (19b) in a sensor main body (1). The underground inclination measuring device can measure extension and deformation in the second-axis optical fiber sensor (152) when the center weight (14) is tilted in a first direction as the two-way coupler (13) rotates due to underground inclination, using the sensor main body (1). Also, the underground inclination measuring device can measure the extension and deformation in the first-axis optical fiber sensor (151) when the lower joint (12) and the center weight (14) are tilted in a second direction by rotating. So, the underground inclination measuring device can accurately measure the underground inclination in multiple directions, which occurs in various directions for prevention of an accident caused by land subsidence or a collapse of a temporary wall and safety diagnosis of the ground when construction such as excavation is conducted.