A system and method for using loop topology identification to investigate a transmission line having a plurality of cable segments. The fluids are substantially immiscible with respect to each other. The upper cover includes a plate member and a second engagement structure mounted on the plate member. Then, the ultrasonic noise is directed past vicinity of the absorbent element such that indirect ultrasonic noise is absorbed by the absorbent element. Data values are buffered in a memory in the control unit. The connecting elements are be arranged in the form of a hexapod.