152 構造ヘルスモニタリングのための5自由度層間変位センサの分解能に関する検討

Abstract

We have developed a novel relative-story displacement sensor for structural health monitoring which is capable of measuring the 5-DOF movement of building layers. Three pairs of infrared-light emitting diode arrays and position sensitive detector units were used for simultaneously measuring the relative displacement, the local inclination angle, and the torsion angle between two adjacent layers. For verification, laboratory tests were carried out using a shaking table, a motorized micrometer, and a rotation stage. In the static experiment, it is verified that the local inclination angle and the torsion angle can be measured as well as the relative-story displacement using the sensor system. The resolution of the sensor system in the displacement measurement, that in the inclination angle measurement, and that in the torsion angle measurement were evaluated to be 0.10 mm, 34.4 urad, and 14.6 urad, respectively. In the dynamic response experiment, the accuracy of the sensor system was experimentally evaluated to be 0.20 mm in the relative-displacement measurement, 110 urad in the inclination angle measurement, and 90 urad in the torsion angle measurement, respectively. These results indicate that the developed sensor system has a sufficient accuracy for structural health monitoring.