| 摘要 |
<p>The piezoelectric properties of a polymeric material, for example polyvinylidene may be enhanced by "poling", which usually involves the application to the material, whilst at an elevated temperature, of a high voltage electric field. The enhancement is however limited by the temperature and electric field that the material can tolerate. Further enhancement is obtained by exposing the material (1) to a quantity of gamma radiation (4) of between 1 and 200 Mrads before <<poling>>; best results are obtained at an exposure level of between 1 and 100 Mrads. The treated material is suitable for use in microphone transmitters, receivers and pressure transducers. </p> |
