Abstract: An aerial electronic system for detection of surface and underground threats comprises an electromagnetic (EM) gradiometer flown aloft over the possible ground and underground threats to a convoy. The EM gradiometer is disposed in a Styrofoam torpedo shaped pod that is towed in flight behind an airplane. An illumination transmitter and loop antenna mounted to the airplane radiate a primary EM wave that travels down to the ground surface and penetrates beneath. Frequencies of 80 KHz to 1 MHz are selected according to whether the targets are laying on the surface or deeply buried. Detonation wire pairs, buried cables and pipes, and other conductors will re-radiate a secondary wave that can be sensed by the EM gradiometer. A reference sample of the transmitter signal is carried down a fiberoptic from the airplane to the towed pod. This signal is used in the synchronous detection to measure the secondary EM wave phase.

Abstract: An electrostatic discharge (ESD) protective bag assembly includes a tote bag and an envelope made from ESD protective material positioned at least partially within the tote bag. The envelope may be defined by two sheets of ESD protective material joined along at least two opposing sides thereof to form join regions. At least one layer of a reinforcing material, such as a fibrous web, is coupled to a portion of each of the join regions. The tote bag and envelope may be coupled to one another by stitches that pass through the reinforcing material.