![]() Indoor and field experiments proved the validity of these mechanisms. This robot has a passive tether-guide module to improve its turning range on a slope, which enables the robot to change its traversal direction independent of the tether direction thus, it has improved turning motion, diagonal traversal motion, and crossing motion on a steep slope. Therefore, in this research, the authors propose an improved version of the dual-wheeled robot to obtain volcanic information from around fumaroles. However, as typical volcanic gas is high temperature and contains toxic chemical components, the manned observation of volcanic fumaroles is dangerous. This is because the gas is highly mobile and quickly transmits underground information to the surface. ![]() Volcanic gas from fumaroles is an effective target for these observations. ![]() ![]() The observation of volcanoes is critical in the estimation of volcanic activities and disaster prevention. ![]()
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