Principle of piezoelectric vibration sensor

piezoelectric tube sensor

piezo sound sensor

piezoelectric energy transducer

About the biomedicine, the control of fluids is a key technology, and the existing structures are more complex and difficult to process. In order to make the fluid control structure simple and easy to integrate and industrialize, we have studied the technology of piezoelectric fluid exciting.the ultrasound piezoceramic hemisphere is to realize fluid transport, and R has carried out the principle of the ultrasound wave of the piezoelectric ceramic and the mechanism of driving fluid movement. An elastic plate piezo-ceramics are attached.it can excite high performance piezo hemisphere  by applying sine and cosine voltages,which is respectively to the ultrasound piezoceramics. Here we study the motion of the particles on the surface after exciting the wave on the elastic sheet. It is isotropic elastic thin plate bending motion.

The ultrasound wave can be excited and the trajectory of the surface of the elastic plate is elliptical. If a fluid-filled tube is attached to the piezo sonar transducer, its elliptical vibrations will be introduced into the fluid,which is causing the fluid to also produce an elliptical motion, thereby driving the movement of the fluid. However, as the distance increasing, the vibration will gradually decay, and only the fluid near the inner wall of the tube can produce elliptical motion. Therefore, in order to be able to operate the fluid, the piezoelectric tube sensor is through which the fluid passes must be very narrow, typically only a few amplitudes deep. In the traveling wave propagation direction is the points of the elastic wrench surface exhibit elliptical motion and piezo sound sensor have certain speeds and pressures and they are both functions of frequency. Therefore, under the high-frequency signal driven, the pressure is generated by the traveling wave can drive the fluid movement. Changing the direction of traveling wave can change the direction of fluid motion. For the particle-enriched fluid, the concentration of the piezoelectric energy transducer is high, and the fork is very narrow due to the fluid pipeline. Under the action of the traveling wave, the oval movement of the inner wall surface of the channel and the friction between the particle and the channel surface will also act simultaneously. , to drive the movement of particles. The movement of the fluid and the movement of the particles will also play a mutually reinforcing role.