Abstract: A square diaphragm formed of monocrystalline silicon and integrally attached to a silicon frame surrounding the diaphragm at its four edges. A serpentine resistor is diffused into the surface of the diaphragm adjacent each of the edges and the resistors are connected in a Wheatstone bridge configuration. The frame of the diaphragm is anodically bonded to a pyrex base member so that all four edges of the diaphragm are fixed relative to the base member and each other. The volume between the base member and the diaphragm is vented to prevent any differential pressure from occurring on the diaphragm.

Abstract: A slideably mounted interrupter, or barrier, is constructed to interrupt or break a detonating train when held in a first position by a leaf spring in an unflexed mode, and to complete the detonating train when the interrupter is moved, by a predetermined amplitude of impact force, to a second position wherein the leaf spring is flexed and firmly wedged into a channel to prevent the interrupter from bouncing or otherwise moving out of the second position.