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    METHOD AND DEVICE FOR FORMING PLASMA ARMATURE OF RAIL GUN TYPE ELECTROMAGNETIC ACCELERATOR
    11.
    发明专利
    METHOD AND DEVICE FOR FORMING PLASMA ARMATURE OF RAIL GUN TYPE ELECTROMAGNETIC ACCELERATOR 失效

    公开(公告)号：JPH043896A

    公开(公告)日：1992-01-08

    申请号：JP10240190

    申请日：1990-04-18

    Applicant: AGENCY IND SCIENCE TECHN ,  FUJI ELECTRIC CO LTD ,  ASAHI CHEMICAL IND ,  NICHICON CORP

    Inventor： USUHA SHIYUU ,  KAKUDATE YOUZOU ,  YOSHIDA MASANORI ,  AOKI KATSUTOSHI ,  YAMAWAKI HIROSHI ,  FUJIWARA SHUZO ,  MIYAMOTO MASAHIRO ,  KUBOTA AKIRA ,  DEN MINORU

    IPC: F41B6/00 ,  H05H1/54

    Abstract: PURPOSE:To form a plasma armature easily with good reproducibility by a method wherein line explosion plasma is blown into an accelerating hole through a fine hole and arc discharge is generated to form the plasma armature by a plasma forming material at a specified place. CONSTITUTION:A total current is conducted at first through a line explosion circuit simultaneously with the starting of electric discharge while plasma, generated by line explosion, is blown into an accelerating hole 2 through a fine hole 11. This phenomenon can be confirmed from the initial small peak of a signal from an optical probe provided near the small hole. When the value of current has arrived at about 20 KA after about 10 mus, new arc discharge is generated at a place whereat the fine hole 11 between rail electrodes 1, 1 is located and the current of the line explosion circuit is attenuated suddenly simultaneously with the generation of the arc discharge whereby the total current is shifted to an arc discharge current quickly. An arc discharge plasma 13 becomes a plasma armature moving with a speed of about 2.5-3.0 Km/s which can be understood from the optical probe signals of respective positions.

    MEASURING INSTRUMENT FOR DETONATION VELOCITY
    13.
    发明专利
    MEASURING INSTRUMENT FOR DETONATION VELOCITY 失效

    公开(公告)号：JPS61292024A

    公开(公告)日：1986-12-22

    申请号：JP13295685

    申请日：1985-06-20

    Applicant: AGENCY IND SCIENCE TECHN ,  NISSAN MOTOR

    Inventor： YOSHIDA MASANORI ,  FUJIWARA SHUZO ,  SHIMANO KUNIO ,  SATO KAZUMI ,  NOUMOTO KAZUMASA

    IPC: G01H5/00 ,  C06C5/00 ,  G01N33/22 ,  G01P3/66

    Abstract: PURPOSE:To measure the velocity of detonation without working completed ordnance, etc., by utilizing the disturbance operation of a magnetic field caused by a detonation wave front and detecting this phenomenon magnetically from outside a body to be detected. CONSTITUTION:When the explosive is detonated by an electric detonating cap 3, its detonation wave is propagated to the other end of a detonation conduction wire 10. Coils 22a and 22b for magnetic field production are arranged coaxially around the detonation conduction wire 10 and outputs of coils 21a and 21b arranged at fixed points A and B are inputted to and stored in a transient phenomenon recording device 30. Then when the detonation wave reaches a trigger generating means 33, an easy-to-rupture conduction wire 34 interposed in parallel to a capacitor 35 fuses or ruptures to generate a trigger, so that an X-Y recorder 32 receives and record the output of a wave memory 31 on a time base.

    HIGH-PERFORMANCE EXPLOSIVE GENERATOR
    15.
    发明专利
    HIGH-PERFORMANCE EXPLOSIVE GENERATOR 失效

    公开(公告)号：JPH05227732A

    公开(公告)日：1993-09-03

    申请号：JP32181091

    申请日：1991-12-05

    Applicant: AGENCY IND SCIENCE TECHN ,  ASAHI CHEMICAL IND ,  FUJI ELECTRIC CO LTD ,  NICHICON CORP

    Inventor： FUJIWARA SHUZO ,  KAKUDATE YOUZOU ,  USUHA SHIYUU ,  YOSHIDA MASANORI ,  AOKI KATSUTOSHI ,  KUBOTA AKIRA ,  SATO SHUNICHI ,  MIYAMOTO MASAHIRO ,  MORITA AKIRA ,  HIROSHIGE NORITOSHI ,  NAKAZAWA NORIO

    IPC: F42D3/00 ,  H02N11/00

    Abstract: PURPOSE:To get a high-performance explosive generator where a large current can flow by charging a normal explosive on initiating side and subsequently highperformance explosive, as the explosive to be charged, in an armature. CONSTITUTION:In case of a coil-type generator, a normal explosive 8 and a highperformance explosive 9 are arranged as explosives inside a cylindrical armature so that the high-performance explosive 9 may become conical at the interface with the normal explosive 9 and pierce the ordinary explosive 8. Moreover, a stator 3 with the normal winding 4 is arranged around an armature 1, and an initial power source 6 and a load 7 are connected, and when the explosion is triggered by the triggering device 5 at one end of the normal explosive, the armature operates by the explosion of the normal explosive 8 at first, and the gap 2 is reduced, and a magnetic field is condensed. And, as the condensation of the magnetic field advances, the explosion of the high- performance explosive 9 begins, and the condensation of the magnetic field advances with great force, as a result, a large current can be supplied to the load 7.

    METHOD AND DEVICE FOR ATTENUATING ARMATURE CURRENT OF RAIL GUN TYPE ELECTROMAGNETIC ACCELERATION SYSTEM
    17.
    发明专利
    METHOD AND DEVICE FOR ATTENUATING ARMATURE CURRENT OF RAIL GUN TYPE ELECTROMAGNETIC ACCELERATION SYSTEM 失效

    公开(公告)号：JPH03282194A

    公开(公告)日：1991-12-12

    申请号：JP8196990

    申请日：1990-03-29

    Applicant: AGENCY IND SCIENCE TECHN ,  FUJI ELECTRIC CO LTD ,  ASAHI CHEMICAL IND ,  NICHICON CORP

    Inventor： USUHA SHIYUU ,  KAKUDATE YOUZOU ,  YOSHIDA MASANORI ,  AOKI KATSUTOSHI ,  YAMAWAKI HIROSHI ,  FUJIWARA SHUZO ,  MIYAMOTO MASAHIRO ,  ICHIKAWA KIYOSHI ,  DEN MINORU

    IPC: F41B6/00 ,  H05H1/54

    Abstract: PURPOSE:To attenuate or eliminate an armature current in the arbitrary place in the accelerating hole of a rail gun by employing only a simple circuit by a method wherein one part of the armature current is guided to an electric bridge when a plasma armature passes through the position of a small electrode so that generated plasma is injected through a plasma injection hole to generate the rupture of insulation between electrode gaps and convert the armature current into a discharging current between gap switches. CONSTITUTION:The end surface of a small electrode 8 is usually exposed on the surface of a rail electrode near a muzzle while being insulated from the rail electrode and is connected electrically to one end of an electric bridge 11. The other terminal of the electric bridge is connected electrically to an electrode in a cavity 10 in one electrode of a gap switch 9 connected in parallel to a rail gun. When an accelerated plasma armature has arrived at the position of the small electrode, one part of an armature current is guided to the electric bridge 11 through the small electrode and plasma 12 is generated in the cavity 10. The plasma is injected through a fine hole 13 and generates plasma 12 in the cavity 10. The plasma is injected through a fine hole 13 and the rupture of insulation is generated between gap switches. As a result, power supply current is branched to the armature current and a gap switch current.

    HIGH-SPEED LARGE-CURRENT SWITCH
    18.
    发明专利
    HIGH-SPEED LARGE-CURRENT SWITCH 失效

    公开(公告)号：JPH03116620A

    公开(公告)日：1991-05-17

    申请号：JP25470089

    申请日：1989-09-29

    Applicant: AGENCY IND SCIENCE TECHN ,  FUJI ELECTRIC CO LTD ,  ASAHI CHEMICAL IND

    Inventor： FUJIWARA SHUZO ,  KAKUDATE YOUZOU ,  USUHA SHIYUU ,  AOKI KATSUTOSHI ,  YOSHIDA MASANORI ,  HIROSHIGE NORITOSHI ,  MORITA AKIRA ,  MIYAMOTO MASAHIRO ,  KUBOTA AKIRA

    IPC: H01H35/14 ,  H01H39/00

    Abstract: PURPOSE:To quickly cut off currents by means of a current limiting effect and obtain a high-speed large-current switch of high performance by generating frictional heat by means of a motive force generated by an explosive so as to enhance the resistance of a current limiting material, and further moving a working body so that the working body is not in contact with electrodes. CONSTITUTION:When a working body 11 is moved by the action of an explosion force generated by explosion of an explosive frictional heat is generated in the contact face if the working body with the electrodes of a current limiter 6 and the temperature of a current limiting material is raised and sodium and/or calium are converted from solids to liquids and are further converted to gases and a large current flowing through the current limiting material exhibits a current limiting effect. The working body 11 is further moved and is mechanically separated from the current limiting element, while the large current is limited by the current limiter 6. Thus the large current is cut off at high speed without generating an arc.

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