| Summary: | 碩士 === 中華大學 === 機械工程學系 === 107 === This paper proposes a membrane-type ultrasonic design with a thickness of less than 1 mm. Its structure will be a membrane-type ultrasonic wave with a resonant cavity at the bottom. The magnetic field effect is generated by the magnet, and the signal is input to generate ultrasonic vibration. Ultrasonic measurement and actual measurement are compared with traditional ultrasonic waves.
In the market, there are many different styles, ultrasonic cleaning machines, in order to facilitate the use of the public, the size of the ultrasonic device will be too small, just put into glasses or jewelry. The thin film coil type ultrasonic device outputs low frequency ultrasonic waves, and the vibration effect thereof cannot destroy the surface of the object. Thin film coil type ultrasonic waves, unlike conventional piezoelectric ultrasonic waves, have different cleaning modes. The planar film vibrates by magnetic force through the effect of electricity.
The membrane type ultrasonic wave directly contacts with water, the change of water quantity, the vibration intensity will change, and the ultrasonic vibration, the vibration area is only located at the electromagnetic effect, and cannot be directly transmitted to the tank body, and the vibration is transmitted through the conduction of water. In the measured results, it was found that when the ultrasonic wave vibrates, water flow and bubble condensation occur. Therefore, the film type ultrasonic wave is outputted at the signal, the frequency performance is concentrated, and the penetrating power is better.
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