With the progress of society and the development of science and technology, ultrasonic technology is widely used in various fields of society, and shows unique advantages different from other technologies. Ultrasonic cleaning, ultrasonic welding, ultrasonic cleaning, ultrasonic scalpel, ultrasonic beauty. There are many common examples in our daily life. For example, an ultrasonic spray humidifier developed using ultrasonic spray technology in dry winter will relax this situation and improve the quality of the room air. In the medical care, it is possible to atomize the water-soluble drug to micro mist particles of 1. Mu. M to 5. Mu. M by ultrasonic energy. In this way, the patient inhales the medicine directly and acts on the affected area to achieve quick treatment. At present<br>Atomization processes include energy transfer. There are many classification methods of ultrasound atomizer. Different energy sources can be divided into two types: One is called an electroacoustic conversion type, and the other is called a hydrodynamic type. An electroacoustic transducer type ultrasonic atomizer converts energy between electrical energy and mechanical energy. Although the electrical signal causes the mechanical motion of the object, the mechanical vibration of the object produces vibration waves of different frequencies, and the ultrasonic frequency is between 20 and 100 kHz. The ultrasonic atomizer uses a high frequency vibration of ultrasound to produce small droplets on the surface of the liquid and cause the liquid to atomize. According to different energy conversion modes, the electroacoustic transducer type ultrasonic atomizer can be classified into three types: acoustic surface tension wave, horn amplification and conical mesh nozzle. A hydrodynamic ultrasonic atomizer produces ultrasonic waves under the action of a resonant gas excited by high speed gas or liquid, and then spray the atomizer. Its vibrational frequency in the normal operating state is derived from the size and structural parameters of the resonant cavity, and its frequency is generally not too high.<br>According to frequency, ultrasonic atomizer is classified into three categories: high frequency ultrasonic atomizer with operating frequency exceeding 1 MHz, low frequency ultrasonic atomizer with operating frequency of 20kHz to 100kHz, and intermediate frequency ultrasonic atomizer with operating frequency of 100kHz imhz. The drawback of high frequency ultrasonic atomizers is the development in various application fields such as low reliability, high requirements for spray media (not suitable for spray of high density liquid), easy to modify the chemical structure of spray media. Very limited. An intermediate frequency ultrasound nebulizer is mainly used in other high-end areas that require medical and ultra precision equipment. The cost is very high and the spray amount is low. Suitable for microplay only. It is not suitable for agricultural spraying and the range of application is relatively narrow. Low frequency ultrasonic atomizer is widely applied in the field of foaming. This is because it is reliable and requires no operating medium and has a uniform distribution of droplets.<br>There are many important issues in the study of the electro acoustic transducer type ultrasonic atomizer at home and abroad, but there are many technical problems not yet solved, such as the further miniaturization, homogenization of the droplet particle, and the difference of the atomization. The effect of the fluid of different viscosity and the high production of the piezoelectric ultrasonic atomizer Complete atomization mechanism and atomization have been established, such as limited lifetime of the atomizer with dynamic frequency. Theory is very important for the study of atomizer. People play an important role in promoting quality improvement in social life.<br>1.4 research contents and issues<br>1.4.1 research content<br>Through the collection and placement of the target data, the principles and the comprehensive application of the single chip microcomputer are acquired, the design specifications of the PCB and the circuit diagram are learned, the design of the digital circuit of the ultrasonic atomizer is completed, and the debug of the design and simulation is completed . Automatic control system program, and completion of graduation thesis writing.<br>1.4.2 research tasks<br>Task 1: the information on the ultrasonic atomizer control system is referred to, and the process and control requirements of the ultrasonic atomizer control system are fully understood and analyzed to determine the overall design scheme.<br>Task 2: choose the controller model<br>
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