| 摘要 |
PURPOSE:To obtain high efficiency, wide band, high sensitivity and high resolution characteristics by forming a metal element on both surfaces of a high polymer piezo-electric film while a matching layer or an insulating layer is formed on one electrode. CONSTITUTION:A probe is made up of a PvF2 film 41 with a 1/4 wavelength thickness as piezo-electric plate, Al as metal electrode 42, a Cu plate with a 1/4 wavelength thickness as sound wave absorbing material 43, a PMMA resin plate as supporting material 44 and a plasma copolymerized film of tetrafluoroethylene with a thickness of 2mum as matching layer or insulating layer 45. This probe is connected to equipment with an input/output impedance of 50ohm to measure the sensitivity and the wavelength with an echo wave from the PMMA plate provided underwater. |
