An igniter includes a first ignition charge, a first member which has a predetermined inner surface and a second member. The second member is arranged in a state of being inserted into the first member and which has a predetermined outer surface opposed to the predetermined inner surface in an arrangement state, for forming a predetermined space to arrange the first ignition charge between the predetermined inner surface and the predetermined outer surface. When the second member is rotated with respect to the first member, then the first ignition charge is ignited in the predetermined space by means of a predetermined pressure including a shear force generated between the predetermined outer surface and the predetermined inner surface in accordance with the rotation, and a combustion product of the first ignition charge is released from an opening of the predetermined space. Accordingly, preferable ignition of the ignition charge is realized.

An igniter includes a first ignition charge, a first member which has a predetermined inner surface and a second member. The second member is arranged in a state of being inserted into the first member and which has a predetermined outer surface opposed to the predetermined inner surface in an arrangement state, for forming a predetermined space to arrange the first ignition charge between the predetermined inner surface and the predetermined outer surface. When the second member is rotated with respect to the first member, then the first ignition charge is ignited in the predetermined space by means of a predetermined pressure including a shear force generated between the predetermined outer surface and the predetermined inner surface in accordance with the rotation, and a combustion product of the first ignition charge is released from an opening of the predetermined space. Accordingly, preferable ignition of the ignition charge is realized.

A fuse mechanism for e.g. a pyrotechnic grenade in which a spring loaded striker lever (31) is blocked via a cammed surface (22) of a safety lever (21) comprising a handle. (25). Release of the handle (25) enables deployment of the fuse assembly. Spring-loaded striker lever (31) is urged upwards by the force of torsion spring (38). Contact between the free end (34) of the striker lever (31) exerts a rotational force on cammed portion (22). The safety lever (21) rotates away from the body of the munition (20). Rapid upward movement of the striker lever (31) is prevented at this stage by contact of the free end (34) with the cammed portion (22). Further rotation of the safety lever (21) occurs until point where the cammed portion (22) is no longer in contact with the striker lever. Ultimately, once the safety lever (21) has rotated beyond a certain extent, the free end of the striker lever (31) is no longer in contact with the cammed portion (22), and the striker lever is urged rapidly away from the body of the munition (20).

A fuse mechanism for e.g. a pyrotechnic grenade in which a spring loaded striker lever (31) is blocked via a cammed surface (22) of a safety lever (21) comprising a handle. (25). Release of the handle (25) enables deployment of the fuse assembly. Spring-loaded striker lever (31) is urged upwards by the force of torsion spring (38). Contact between the free end (34) of the striker lever (31) exerts a rotational force on cammed portion (22). The safety lever (21) rotates away from the body of the munition (20). Rapid upward movement of the striker lever (31) is prevented at this stage by contact of the free end (34) with the cammed portion (22). Further rotation of the safety lever (21) occurs until point where the cammed portion (22) is no longer in contact with the striker lever. Ultimately, once the safety lever (21) has rotated beyond a certain extent, the free end of the striker lever (31) is no longer in contact with the cammed portion (22), and the striker lever is urged rapidly away from the body of the munition (20).

A fuse mechanism for e.g. a pyrotechnic grenade in which a spring loaded striker lever (31) is blocked via a cammed surface (22) of a safety lever (21) comprising a handle. (25). Release of the handle (25) enables deployment of the fuse assembly. Spring-loaded striker lever (31) is urged upwards by the force of torsion spring (38). Contact between the free end (34) of the striker lever (31) exerts a rotational force on cammed portion (22). The safety lever (21) rotates away from the body of the munition (20). Rapid upward movement of the striker lever (31) is prevented at this stage by contact of the free end (34) with the cammed portion (22). Further rotation of the safety lever (21) occurs until point where the cammed portion (22) is no longer in contact with the striker lever. Ultimately, once the safety lever (21) has rotated beyond a certain extent, the free end of the striker lever (31) is no longer in contact with the cammed portion (22), and the striker lever is urged rapidly away from the body of the munition (20).

A fuse mechanism for e.g. a pyrotechnic grenade in which a spring loaded striker lever (31) is blocked via a cammed surface (22) of a safety lever (21) comprising a handle. (25). Release of the handle (25) enables deployment of the fuse assembly. Spring-loaded striker lever (31) is urged upwards by the force of torsion spring (38). Contact between the free end (34) of the striker lever (31) exerts a rotational force on cammed portion (22). The safety lever (21) rotates away from the body of the munition (20). Rapid upward movement of the striker lever (31) is prevented at this stage by contact of the free end (34) with the cammed portion (22). Further rotation of the safety lever (21) occurs until point where the cammed portion (22) is no longer in contact with the striker lever. Ultimately, once the safety lever (21) has rotated beyond a certain extent, the free end of the striker lever (31) is no longer in contact with the cammed portion (22), and the striker lever is urged rapidly away from the body of the munition (20).

A technique facilitates analysis of hydraulic fractures. A plurality of explosive pellets is constructed for delivery into fracture or fractures of a subterranean formation. Each explosive pellet comprises an explosive material combined with an initiating member working in cooperation with a friction sensitive pyrotechnic mixture. Crushing or otherwise actuating the initiating member initiates the friction sensitive pyrotechnic mixture which, in turn, ignites the explosive material to produce explosive signals. The explosive signals may be monitored to obtain data related to the fracture or fractures.

A technique facilitates analysis of hydraulic fractures. A plurality of explosive pellets is constructed for delivery into fracture or fractures of a subterranean formation. Each explosive pellet comprises an explosive material combined with an initiating member working in cooperation with a friction sensitive pyrotechnic mixture. Crushing or otherwise actuating the initiating member initiates the friction sensitive pyrotechnic mixture which, in turn, ignites the explosive material to produce explosive signals. The explosive signals may be monitored to obtain data related to the fracture or fractures.

An igniter, an ignition method and a method of assembling an ignitor are provided. In one embodiment, the igniter includes a first member having an inner surface. The igniter also includes a second member having an outer surface engaged with the inner surface when in an assembled configuration and forming a space between the inner surface and the outer surface. The igniter further includes an ignition charge disposed in the space. The second member is configured to move with respect to the first member when in the assembled configuration so as to apply a predetermined pressure, which includes a shear force and a compressive force, to the ignition charge to ignite the ignition charge. According to various embodiments, ignition of the ignition charge is improved.

An igniter, an ignition method and a method of assembling an ignitor are provided. In one embodiment, the igniter includes a first member having an inner surface. The igniter also includes a second member having an outer surface engaged with the inner surface when in an assembled configuration and forming a space between the inner surface and the outer surface. The igniter further includes an ignition charge disposed in the space. The second member is configured to move with respect to the first member when in the assembled configuration so as to apply a predetermined pressure, which includes a shear force and a compressive force, to the ignition charge to ignite the ignition charge. According to various embodiments, ignition of the ignition charge is improved.