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    • 6. 发明授权
    • Method for measuring the muzzle velocity of a projectile or the like
    • 用于测量射弹等的枪口速度的方法
    • US07825850B2
    • 2010-11-02
    • US11953785
    • 2007-12-10
    • Henry Frick
    • Henry Frick
    • G01S13/58G01P3/66G01S13/00G01P3/00
    • F41A21/32G01P3/665G01S11/023
    • It is proposed to use the gun barrel or launcher tube or the muzzle brake as a waveguide, which, however, is operated at a frequency that is below the cutoff frequency of the relevant waveguide mode. The transmit coupler excites the relevant waveguide mode. An oscillator generates the signal, which is then sent to the transmit coupler. The waveguide and the projectile form a system in which the electromagnetic field at the receive coupler is influenced by the position of the projectile. The characteristic change over time of the strength of the electromagnetic field at the location of the receive coupler that results from the change in the distance between the projectile and the receive coupler is measured and used to determine the muzzle velocity.
    • 建议使用枪管或发射管或枪口制动器作为波导,然而,其工作频率低于相关波导模式的截止频率。 发射耦合器激发相关波导模式。 振荡器产生信号,然后发送到发送耦合器。 波导和射弹形成了一种系统,其中接收耦合器处的电磁场受射弹位置的影响。 测量由射弹和接收耦合器之间的距离变化引起的接收耦合器位置处的电磁场强度随时间的特性变化,并用于确定枪口速度。
    • 7. 发明授权
    • Rf position-sensing and control system
    • 射频位置传感与控制系统
    • US3623101A
    • 1971-11-23
    • US3623101D
    • 1968-07-11
    • AMP INC
    • GREBE ROBERT KARLKREINBERG EARL RAYMOND
    • G01S11/02G01S19/35G05D15/01G01S11/00
    • G05D15/01G01S11/023
    • Method and means are disclosed for sensing and detecting the position of a member by the effect of the member on the coupling between sensing elements separately connected to an RF transmitter and an RF receiver. The sensing elements are disposed to provide a degree of coupling therebetween related to the physical position of the member between such elements and to produce a sensed signal indication of either member position or member presence. The sensed signal is detected and applied to a utility device which may be in the form of an alarm, counter indicator, recorder, or in the form of a motor to provide a feedback signal capable of altering the position of the sensed member. In one form of the invention a wire or strip feeding control apparatus senses the position of a free-hanging span of the wire or strip to develop a reel-motor control signal and adjust the fall or sag of the span, thereby controlling feed rate and wire or strip tension. For nonconductive sensed members or for fluids a conductive element is carried in a frame of dielectric material in the plane of the sensing element coupling which restricts the sensed member to movement along an axis bisecting the zone of coupling of the transmitting and receiving antenna elements.