| 摘要 |
<p>The invention relates to a piezoelectric sensor for measuring dynamic viscosity, which may be used for adjusting the fuel viscosity for fluidizing the same by appropriate heating, for military vehicles operating at extreme negative temperatures, in the military industry, as well as for measuring, in open loop, the viscosity of the transformer oil, used as cooling agent in the high power transformers in the power engineering. According to the invention, the sensor consists of an assembly of two piezoelectric disks (3a, 3b) spaced apart from each another, the first disk (3a) is named piezo-emitter, the second disk (3b) is named piezo-receiver, each of these being placed on a brass disk (2a, 2b), forming the piezo-emitting assembly, and the piezo-receiving assembly, respectively, each of these two assemblies being placed on a square-shaped ceramic plate (1b, 1c), two other square-shaped ceramic plates (1a, 1d), of the same size, being placed on top of the two piezo-emitting and piezo-receiving assemblies, respectively, in order to allow some connection conducting cables (4a, 4b, 4c and 4d) to come out; the spacing of the two piezoelectric disks (3a, 3b) is carried out by placing two glass fiber spacers (5a, 5b) between the ceramic plates (1b, 1c), the parallelism of the four plates (1a, 1b, 1c, 1d) is obtained by means of four spacers (6a, 6b, 6c, 6d) of the same length, and an epoxidic resin (7a, 7b, 7c, 7d) is applied onto the entire outline of the four ceramic plates (1a, 1b, 1c, 1d) to obtain the perfect sealing for the piezo-emitting assembly, and the piezo-receiving assembly, respectively, in relation to the liquid whose viscosity is desired to be measured.</p> |
