<p>A method and apparatus for detecting an event in a structure using a device having sensors (50) and at least one actuator (60), where the at least one actuator is encapsulated. When the at least one actuator (60) transmits a signal toward the event, the return signals are received at the sensors (50), after which the respective travel times of the signals are determined to determine an angle and a distance that defines the position of the event.</p>
