| 摘要 |
PURPOSE:To easily measure the viscosity of a liquid in a real time by bringing a liquid whose viscosity is to be measured into contact with an intermediate part of a pair of input electrodes and a pair of output electrodes. CONSTITUTION:On the same surface of a substrate 10 consisting of a piezoelectric material for generating a leakage surface acoustic wave and a cut surface, a liquid contact frame 14 is provided so that a liquid 13 whose viscosity is to be measured comes into contact with an intermediate part of a pair of input electrodes 111, 112 and a pair of output electrodes 121, 122. A surface acoustic wave which has been excited by an AC voltage applied to the pair of input electrodes 111, 112 comes into contact with the liquid 13 whose viscosity is to be measured and propagated through the inside of the frame 14, and generates an AC voltage by the pair of output electrodes 121, 122. A power ratio of an applied AC and a generated AC depends on a propagation loss of the leakage surface acoustic wave between the pair of input electrodes 111, 112 and the pair of output electrodes 121, 122. The propagation loss is related to viscosity of the liquid in the frame 14, therefore, by measuring 16 the propagation loss, namely, the power ratio of an input and an output, the viscosity of the liquid can be measured. |
