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    • 1. 发明授权
    • Laser machining of explosives
    • 激光加工炸药
    • US6150630A
    • 2000-11-21
    • US62078
    • 1998-04-17
    • Michael D. PerryBrent C. StuartPaul S. BanksBooth R. MyersJoseph A. Sefcik
    • Michael D. PerryBrent C. StuartPaul S. BanksBooth R. MyersJoseph A. Sefcik
    • B23K26/00B23K26/06B23K26/12B23K26/18B23K26/36B23K26/38B23K26/40C06B21/00F42B33/00H01S3/00
    • C06B21/0033B23K26/0624B23K26/12B23K26/127B23K26/18B23K26/382B23K26/402F42B33/008B23K2203/05G02F2001/392H01S3/0057
    • The invention consists of a method for machining (cutting, drilling, sculpting) of explosives (e.g., TNT, TATB, PETN, RDX, etc.). By using pulses of a duration in the range of 5 femtoseconds to 50 picoseconds, extremely precise and rapid machining can be achieved with essentially no heat or shock affected zone. In this method, material is removed by a nonthermal mechanism. A combination of multiphoton and collisional ionization creates a critical density plasma in a time scale much shorter than electron kinetic energy is transferred to the lattice. The resulting plasma is far from thermal equilibrium. The material is in essence converted from its initial solid-state directly into a fully ionized plasma on a time scale too short for thermal equilibrium to be established with the lattice. As a result, there is negligible heat conduction beyond the region removed resulting in negligible thermal stress or shock to the material beyond a few microns from the laser machined surface. Hydrodynamic expansion of the plasma eliminates the need for any ancillary techniques to remove material and produces extremely high quality machined surfaces. There is no detonation or deflagration of the explosive in the process and the material which is removed is rendered inert.
    • 本发明包括一种用于加工(切割,钻孔,雕刻)爆炸物(例如TNT,TATB,PETN,RDX等)的方法。 通过使用持续时间在5飞秒至50皮秒范围内的脉冲,可以在基本上没有受热或冲击影响的区域实现非常精确和快速的机械加工。 在这种方法中,通过非热机制去除材料。 多光子和碰撞电离的组合在比电子动能转移到晶格更短的时间尺度上产生临界密度等离子体。 所得到的等离子体远离热平衡。 该材料本质上从其初始固态直接转化为完全离子化的等离子体,其时间尺度太短而不能与晶格建立。 结果,除去区域之外的热传导可忽略不计,导致对激光加工表面超过几微米的材料的热应力或冲击可忽略不计。 等离子体的流体动力学膨胀不需要任何辅助技术去除材料并产生极高质量的加工表面。 在该过程中爆炸物没有爆炸或爆燃,被除去的物质变得惰性。
    • 2. 发明授权
    • Laser radiography forming bremsstrahlung radiation to image an object
    • 激光放射成像bre致辐射成像物体
    • US06678351B1
    • 2004-01-13
    • US09564957
    • 2000-05-04
    • Michael D. PerryJoseph A. Sefcik
    • Michael D. PerryJoseph A. Sefcik
    • G21G400
    • H05G2/00
    • A method of imaging an object by generating laser pulses with a short-pulse, high-power laser. When the laser pulse strikes a conductive target, bremsstrahlung radiation is generated such that hard ballistic high-energy electrons are formed to penetrate an object. A detector on the opposite side of the object detects these electrons. Since laser pulses are used to form the hard x-rays, multiple pulses can be used to image an object in motion, such as an exploding or compressing object, by using time gated detectors. Furthermore, the laser pulses can be directed down different tubes using mirrors and filters so that each laser pulse will image a different portion of the object.
    • 通过用短脉冲大功率激光产生激光脉冲来对物体进行成像的方法。 当激光脉冲撞击导电靶时,产生bre致辐射,使得形成硬质弹性高能电子以穿透物体。 物体的另一侧的探测器检测这些电子。 由于使用激光脉冲来形成硬X射线,所以可以使用多个脉冲来通过使用时间选通检测器来对运动中的物体(例如爆炸或压缩物体)进行成像。 此外,可以使用反射镜和滤光器将激光脉冲引导到不同的管,使得每个激光脉冲将对对象的不同部分进行成像。