| 摘要 |
A blast movement monitor for measuring the movement of material within a body of material as a result of a blasting operation, the monitor including: a housing having an interior chamber defining an inner surface; and an internal communication device that is received immediately within the interior chamber of the housing, the internal communication device including : a body portion; an electric coil wound around the body portion; a circuit board electrically connected to the coil; a battery electrically connected to the circuit board; an end portion associated with one end of the body portion; and a cap associated with an opposing end of the body portion that encapsulates the body portion and sealingly houses the body portion; wherein the internal communication device is biased to facilitate self righting of the internal communication device to a desired orientation withi n the interior chamber independent of the orientation of the monitor.
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