PYROELECTRIC SENSOR Russian patent published in 1997 - IPC

FIELD: fuel ignition in rocket engines and actuation of space rocketry pyrotechnical automatic equipment units. SUBSTANCE: pyroelectric sensor has a casing, which accommodates an electric ignition unit with conductors passing through an insulator, resistance bridges and an initiating charge, and a pyrotechnical charge closed with a cap. An obturating device is positioned between the electric ignition unit and pyrotechnical charge, the obturating device is a tapered cavity made in the casing, which accommodates a movable obturating cone resting with its base on a grid with through central and peripheral ducts and having a seat with a transmission charge on the side of the pyrotechnical charge. On the side of the obturating cone the grid may have cross-shaped slots communicating with the central and peripheral ducts; the peripheral ducts are arranged in circumference with a radius making up 1.5 to 2.5 of obturating cone base radius. Pyrotechnical charge is pressed by the augmentation bush mounted in the casing mouth and having a funnel of a cylinder-cone shape; the cylindrical part of funnel may have a diameter 0.5-0.65 of pyrotechnical charge diameter. A compensating disk made of dielectric is positioned between electric ignition unit and obturating device. EFFECT: improved design. 3 cl, 1 dwg