| 摘要 |
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.
|
