Abstract
We have developed a novel distance measurement (DM) system with a silica-based planar light wave circuit (PLC) and fiber optics for construction and civil engineering. The PLC contains thermooptic switches (TOSWs) that utilize the index change caused by the thermooptic effect. These switches are used for changing the light path and attenuating the light signal. The performance of the DM system was evaluated by the outdoor DM and linearity measurement. The outdoor DM at the distance of 104 m was achieved with the commercial retroreflective sheet and the measurement at the distance of 1 km with a corner-cube prism is possible. The resolution of the system is about 1.7 mm (1σ). These results show our DM system fulfills the same required specifications as the conventional system that utilizes bulk optics. Moreover, the system has many advantages such as robustness, compactness, being noise-free, ease of alignment and stability.
Published Version
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