| 摘要 |
PURPOSE:To measure the viscosity index of liquid, the mass addition effect of a thin film, a change in the propagation speed of surface acoustic waves by temp., and a change in the electrical characteristics of the liquid by forming an electrically shorted surface and an unshorted surface. CONSTITUTION:Electrodes 2, 2' for transmission, electrodes 3, 3' for reception and two sets of surface acoustic wave delay wires are disposed on the surface of a piezoelectric substrate 1 which excites the surface acoustic waves. The one propagation surface 4 is electrically shorted and the other propagation surface 5 is opened to admit fluid to be measured into a pool 6. The electrical properties and viscosity of the liquid and the change in the speed of the surface acoustic waves by the influence of temp. are read at the propagation surface 5. The viscosity and the change in the speed of the surface acoustic waves by the influence of temp. are read at the propagation surface 4 on a reference side. The temp. difference between the two propagation surfaces is then eliminated and only the electrical influence of the liquid can be taken out. |
