Development and Calibration of a TDR Extensometer for Geotechnical Monitoring

摘要: Up-hole reflectometry devices that interrogate passive mechanical transducers are increasingly used in geotechnical instrumentation. One of such a monitoring technique is the time domain (TDR). This study utilizes principle TDR to devise extensometer using waveguide with an impedance mismatch interface inside it. The movement coupled displacement interest shift reflected signal becomes measure displacement. accuracy better than ± 0.5 mm and not affected by measuring range cable length. It can be for applications require both high large range, suitable long-term harsh environment where humidity lightening surge may cause problems electronic sensors. devised combined existing groundwater pressure shear deformation form integrated system slope stability.