An apparatus for detecting data in a fluid pressure signal in a conduit comprises an optical fiber loop comprises a measurement section and a delay section wherein the measurement section is disposed substantially circumferentially around at least a portion of the conduit, and wherein the measurement section changes length in response to the fluid pressure signal in the conduit. The dunnage removal apparatus includes a guide chute that funnels a loose flap of the dunnage sheet toward a sheet stripper mechanism. When the extraction amount sensor is ON, the object loaded on the seat is judged as being a child restraint system or a child.