| 摘要 |
A device sensitive to pressure waves including first and second sheets of polyvinylidene fluoride supported in spaced apart relationship. The major faces of each sheet are provided with respective inner and outer foils of copper and an electrically insulating sheet of PTFE is sandwiched between, and bonded to, the inner foils. The first and second sheets are poled in a direction normal to their respective major surfaces so as to be more sensitive to pressures waves incident thereon, along said normal direction, than to pressure waves incident thereon along other directions. The inner electrically conductive sheets are electrically connected together and a voltage sensor is used to detect voltages, developed across the major surfaces of the first and second sheets and indicative of pressure waves incident thereon. |
