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    Acoustic transducer with direct current output
    4.
    发明授权
    Acoustic transducer with direct current output 失效
    具有直流输出的声学传感器

    公开(公告)号：US3909741A

    公开(公告)日：1975-09-30

    申请号：US52056874

    申请日：1974-11-04

    Applicant: GEN ELECTRIC

    Inventor： HARRIS LAWRENCE A

    IPC: H03F13/00 ,  H03F3/04

    CPC classification number: H03F13/00

    Abstract: An acoustic transducer which produces a direct current output signal suitable for capacitive storage is described. Incident acoustic energy is converted to a surface wave in a piezoelectric rod. A first slab of semiconductor material lying in close proximity to the surface of the rod forms a traveling wave amplifier. Energy is coupled from the amplifier bias circuit to the surface wave. A second slab of semiconductor material lying proximate to the piezoelectric rod forms a traveling wave attenuator. Energy coupled from the surface wave to the attenuator changes the conductivity of the second semiconductor slab. Direct current flow in the attenuator bias circuit varies in proportion to the incident acoustic wave intensity. In a second embodiment a reference surface wave is mixed with the output of the traveling wave amplifier. The piezoelectric rod is stressed into a non-linear region producing a direct current output signal which is proportional to the intensity of the incident acoustic energy.

    Abstract translation: 描述了产生适合电容存储的直流输出信号的声换能器。 入射声能被转换为压电杆中的表面波。 靠近杆表面的第一半导体材料板形成行波放大器。 能量从放大器偏置电路耦合到表面波。 靠近压电杆的第二半导体材料板形成行波衰减器。 从表面波耦合到衰减器的能量改变了第二半导体板的导电性。 衰减器偏置电路中的直流电流与入射的声波强度成比例地变化。

    Secondary electron energy analyzing apparatus
    7.
    发明授权
    Secondary electron energy analyzing apparatus 失效
    二次电子能量分析装置

    公开(公告)号：US3609352A

    公开(公告)日：1971-09-28

    申请号：US3609352D

    申请日：1970-05-18

    Applicant: GEN ELECTRIC

    Inventor： HARRIS LAWRENCE A

    IPC: H01J49/48 ,  H01J37/00 ,  G01N23/00

    CPC classification number: H01J49/482

    Abstract: A secondary electron energy analyzer employs a pair of spaced coaxial cylinders with entrance and exit slots in the inner cylinder, the distance between the slots and the potential between the cylinders being such that secondary electrons emitted from a specimen located at a point on the axis of the cylinders enter the space between the cylinders at the entrance slot and are focused at the exit slot. An electron multiplier is located within the inner cylinder to receive the focused electrons. The outer cylinder may be split into two portions, each with its individual slots and operated at slightly different potentials, so that electrons of different energies are focused at the two exit slots, measurement of the difference in the outputs from the two portions yielding the derivative of the energy distribution curve of secondary electrons.

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