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31 条记录 (耗时 0.015 秒)

    Preloaded parabolic dish antenna and the method of making it
    3.
    发明授权
    Preloaded parabolic dish antenna and the method of making it 失效

    公开(公告)号：US06911958B2

    公开(公告)日：2005-06-28

    申请号：US10333967

    申请日：2001-07-30

    申请人： Govind Swarup ,  Suresh Chandra Tapde

    发明人： Govind Swarup ,  Suresh Chandra Tapde

    IPC分类号： H01Q15/14 ,  H01Q15/16 ,  H01Q1/12

    CPC分类号： H01Q1/005 ,  H01Q15/141 ,  H01Q15/147 ,  H01Q15/168

    摘要： The back-up structure of a parabolic dish antenna, which supports its reflecting surface, is formed in this invention by preloading its radial and circumferentially placed straight structural members and hence it is termed as preloaded parabolic dish antenna. Such a preloading results in considerable reduction in its weight and also to the effort involved in its assembly. The back-up structure of the preloaded parabolic dish antenna is made of a central hub, an assembly of a suitable number of elastically bent radial structural members connected rigidly to the central hub and to the same number of straight structural members which are connected to the tips of the radial members at the outer rim of the dish and also to straight bracing members placed circumferentially at intermediate locations, which are all tensioned to specified prestress values in the absence of wind loading. The outermost rim members placed at the periphery of the dish form the aperture of the dish. The backup structure of the preloaded parabolic dish antenna is given the parabolic shape by fixing the radial members at a suitable inclination angle and location at the hub and by applying an appropriate force with a normal component at their tips so as to bend the radial members elastically such that their curvature becomes approximately the same as that of the parabolic curve between the hub and the peripheral rim point. The invention incorporates a suitable rigid connection of the elastically bent radial members and other structural members in order to store sufficient initial elastic energy in the back-up structure of the dish for resisting gravitational and static and dynamic wind forces on the parabolic dish antenna for the survival wind condition at the antenna site. This configuration also reduces moment of the wind forces and torques on the mounting tower and gear drive system of the dish antenna. This invention is also applicable to structures of geometries other than that of the parabolic dishes. The method of constructing the preloaded parabolic dish and attaching reflector panels of lightweight is also disclosed.The preloaded parabolic dish antennas are useful in microwave communication, satellite communication, radar, radio telescope and other similar applications for receiving and/or transmitting radio waves.

    High brightness optical parametric amplifier array
    4.
    发明授权
    High brightness optical parametric amplifier array 失效
    高亮度光参量放大器阵列

    公开(公告)号：US6052218A

    公开(公告)日：2000-04-18

    申请号：US40192

    申请日：1998-02-12

    申请人： Suresh Chandra ,  Geraldine H. Daunt ,  Michael J. Ferry

    发明人： Suresh Chandra ,  Geraldine H. Daunt ,  Michael J. Ferry

    IPC分类号： G02F1/39 ,  H01S3/23 ,  H01S3/00

    CPC分类号： G02F1/39 ,  G02F2001/392

    摘要： A high brightness optical parametric amplifier array uses energy--scaleable optical parametric amplifiers that provide high brightness output. The leability in energy is achieved by using an array of parallel crystal amplifiers to handle high laser energies. High brightness is obtained by using an optical phase conjugator to keep the phase front of the array coherent.

    摘要翻译： 高亮度光学参数放大器阵列使用提供高亮度输出的能量可缩放光参量放大器。 通过使用并联晶体放大器的阵列来处理高激光能量来实现能量的可扩展性。 通过使用光相位共轭器来保持阵列的相位前沿相干，可获得高亮度。

    Gatling gun laser pulse amplifier using an optical diode
    5.
    发明授权
    Gatling gun laser pulse amplifier using an optical diode 失效
    加特岭枪激光脉冲放大器采用光二极管

    公开(公告)号：US5018163A

    公开(公告)日：1991-05-21

    申请号：US515139

    申请日：1990-04-26

    申请人： Geraldine H. Daunt ,  Richard A. Utano ,  Suresh Chandra

    发明人： Geraldine H. Daunt ,  Richard A. Utano ,  Suresh Chandra

    IPC分类号： H01S3/10 ,  H01S3/23

    CPC分类号： H01S3/2333 ,  H01S3/10076 ,  H01S3/2316

    摘要： A laser oscillator system which transmits laser input beam pulses through optical diode and into a plurality of time-multiplexed phase conjugate amplifier which sequentially amplify in chronological order subsequent input beam pulses. The optical diode is positioned on the oscillator laser beam pulse axis and is comprised of a polarizer, a half-wave plate which rotates the pulse polarity by 45.degree. in one direction and a Faraday rotator which rotates the pulse polarity 45.degree. in the opposite direction. A plurality of grouped Pockels cells and polarizers are positioned on the oscillator axis past the Faraday rotator. The polarizers route the input beam pulse toward a phase conjugate amplifier when a half-wave voltage is applied to the Pockels cell. Each phase conjugate amplifier has a phase conjugate mirror, at its output for retroreflecting the once amplified input laser beam pulse back therethrough for a second amplification. The twice amplified laser beam pulse is returned back to and reflected off the beam splitter back through the Pockels cell. The pockels cell rotates the pusle back to its orignial polarity as the pulse returns to the optical diode. Teh faraday rotator rotates the pulse 45.degree. and the half-wave plate rotates the pulse another 45.degree. for a total of 90.degree.. The 90.degree. rotated amplified output pulses from the time multiplexed amplifiers are reflected off the polarizer and out the laser system.

    摘要翻译： 激光振荡器系统，其将激光输入束脉冲通过光二极管传输到多个时间复用相位共轭放大器中，其按时间顺序依次放大随后的输入光束脉冲。 光二极管位于振荡器激光束脉冲轴上，由偏振器，将脉冲极性在一个方向旋转45度的半波片和将相反方向旋转脉冲极性45度的法拉第转子 。 多个分组的Pockels单元和偏振器位于振荡器轴上经过法拉第旋转器。 当半波电压施加到Pockels单元时，偏振器将输入光束脉冲路向相位共轭放大器。 每相位共轭放大器具有相位共轭反射镜，在其输出端用于将一次放大的输入激光束脉冲反向后向反射，以进行第二次放大。 两次放大的激光束脉冲通过Pockels单元返回并从光束分离器反射回来。 当脉冲返回到光二极管时，斑点细胞将睫毛旋转回其极性。 Teh法拉第旋转器旋转脉冲45°，半波片将脉冲旋转45°，总共90°。 来自时间多路复用放大器的90°旋转放大输出脉冲从偏振器反射出来，并从激光系统出来。

    Gatling gun laser pulse amplifier using rotating mirrors
    6.
    发明授权
    Gatling gun laser pulse amplifier using rotating mirrors 失效
    加特林枪激光脉冲放大器使用旋转镜

    公开(公告)号：US4998259A

    公开(公告)日：1991-03-05

    申请号：US500968

    申请日：1990-03-29

    申请人： Suresh Chandra ,  Geraldine H. Daunt

    发明人： Suresh Chandra ,  Geraldine H. Daunt

    IPC分类号： H01S3/10 ,  H01S3/23

    CPC分类号： H01S3/2333 ,  H01S3/2383 ,  H01S3/10076

    摘要： A laser oscillator system which transmits laser input beam pulses through aolarizer onto the surface of a rotating mirror which routes the laser beam pulses sequentially into a plurality of stationary phase conjugate amplifiers. The pulse repetition frequency of the oscillator input beam pulses is much higher than any one of the amplifiers can handle without overheating. The amplifiers are positioned in a circle around the laser oscillator axis. The polarizer and rotating mirror are positioned on the oscillator axis. The mirror is synchronized with the input beam pulses so that each subsequent input beam pulse enters the next amplifier in sequence. Each phase conjugate amplifier has associated therewith a quarter-wave plate and a phase conjugate mirror at its output. The phase conjugate mirror is preferably comprised of a focusing lens and a stimulated Brillouin scattering cell. The cell retroreflects the once amplified beam pulse back through the quarter-wave plate, which has now rotated the beam pulse polarization through 90.degree.. Each pulse is amplified a second time and is reflected off the mirror and the back of the polarizer and out of the laser system. The laser system makes possible the handling of a large pulse repetition frequency of amplified output laser beam pulses.

    摘要翻译： 激光振荡器系统，其将激光输入光束脉冲通过偏振器发射到旋转镜的表面上，其将激光束脉冲顺序地路由到多个固定相位共轭放大器中。 振荡器输入波束脉冲的脉冲重复频率远高于放大器可以处理的任何一个而不过热。 放大器位于激光振荡器轴周围的圆周。 偏振器和旋转镜位于振荡器轴上。 反射镜与输入光束脉冲同步，使得每个后续输入光束脉冲依次进入下一个放大器。 每个相位共轭放大器在其输出端具有四分之一波片和相位共轭反射镜。 相位共轭反射镜优选由聚焦透镜和受激布里渊散射单元组成。 电池将一次放大的光束脉冲反射回四分之一波片，现在已将光束脉冲极化旋转90度。 每个脉冲被第二次放大并被反射离开反射镜和偏振器的背面并离开激光系统。 激光系统可以处理放大的输出激光束脉冲的大脉冲重复频率。