1. Ultrasonic sound waves are the form of propagation of the mechanical vibration state of an object. Ultrasound refers to sound waves with a vibration frequency greater than 20,000 Hz. The number of vibrations per second is very high, which exceeds the upper limit of human hearing. People call this inaudible sound wave ultrasonic. Ultrasonic is a mechanical oscillation in an elastic medium. There are two forms: lateral oscillation (transverse wave) and longitudinal oscillation (longitudinal wave). In industrial applications, longitudinal oscillations are mainly used. Ultrasonic waves can travel in gases, liquids, and solids at different propagation speeds. In addition, it also has refraction and reflection phenomena and decays during propagation. The laws of reflection, refraction, diffraction, and scattering of ultrasonic waves in the medium are not fundamentally different from the laws of audible sound waves.
Compared with audible sound waves, ultrasonic waves have many singular characteristics: propagation characteristics—the diffraction power of ultrasonic waves is very poor, and it can directional linear propagation in a uniform medium. The shorter the wavelength of ultrasonic waves, the more significant this characteristic is. Power Characteristics - When sound travels through the air, it pushes the particles in the air back and forth to work on the particles. At the same intensity, the higher the frequency of the sound wave, the greater the power it has. Since the ultrasonic frequency is high, the power of the ultrasonic wave is very large compared to the general sound wave. Cavitation - When ultrasonic waves propagate through a liquid, small holes are created inside the liquid due to the intense vibration of the liquid particles. These small cavities rapidly swell and close, causing a violent impact between the liquid particles, resulting in pressures of thousands to tens of thousands of atmospheres. This violent interaction between the particles causes the temperature of the liquid to rise suddenly, emulsification of the two immiscible liquids (such as water and oil), and accelerates the dissolution of the solute and accelerates the chemical reaction. This various effects caused by the action of ultrasonic waves in the liquid are called cavitation of the ultrasonic waves.
Characteristics of ultrasonic waves: (1) When the ultrasonic wave is transmitted, the directivity is strong and the energy is easy to concentrate; (2) the ultrasonic energy can propagate in various media and can spread far enough distance; (3) the ultrasonic wave and the sound transmitting medium Moderate interaction, easy to carry information about the state of the sound medium (diagnosis or effect on the sound medium).
2. Ultrasonic sensor The ultrasonic sensor is a sensor developed using the characteristics of ultrasonic waves. Ultrasound is used as a means of detection, and ultrasonic waves and ultrasonic waves must be generated. The device that performs this function is an ultrasonic sensor, which is conventionally called an ultrasonic transducer, or an ultrasonic probe. The ultrasonic probe is mainly composed of a piezoelectric wafer, which can emit ultrasonic waves as well as ultrasonic waves. The core of the ultrasound probe is a piezoelectric wafer in its plastic jacket or metal jacket. There are many kinds of materials constituting the wafer. The main materials of the ultrasonic sensor are piezoelectric crystal (electrostrictive) and nickel-iron aluminum alloy (magnetostrictive). The electrostrictive material is lead zirconate titanate (PZT) or the like. An ultrasonic sensor composed of a piezoelectric crystal is a reversible sensor that converts electrical energy into mechanical oscillation to generate ultrasonic waves, and when it receives ultrasonic waves, it can also be converted into electrical energy, so it can be divided into a transmitter or a receiver. Some ultrasonic sensors are used for both transmission and reception. The ultrasonic sensor is composed of a transmitting sensor (or a wave transmitter), a receiving sensor (or a wave receiver), a control portion, and a power supply portion. The transmitter sensor consists of a transmitter and a ceramic vibrator transducer with a diameter of about 15 mm. The transducer functions to convert the electrical vibration energy of the ceramic vibrator into super energy and radiate into the air; and the receiving sensor is a ceramic vibrator transducer. Composed of an amplifying circuit, the transducer receives waves to generate mechanical vibrations, converts them into electrical energy, and acts as an output of the sensor receiver to detect the transmitted ultrasonic waves. The control part mainly controls the pulse chain frequency, duty cycle, sparse modulation and counting, and detection distance sent by the transmitter.
Second, the application of ultrasonic sensors 1. Application of ultrasonic distance sensor technology Ultrasonic sensors include three parts: ultrasonic transducer, processing unit and output stage. First, the processing unit applies voltage excitation to the ultrasonic transducer. After being excited, the ultrasonic transducer emits ultrasonic waves, and then the ultrasonic transducer is turned into the receiving state, and the processing unit analyzes the received ultrasonic pulse to determine whether the received signal is The echo of the emitted ultrasonic waves. If yes, measure the travel time of the ultrasonic wave, convert it to the stroke according to the measured time, and divide by 2, which is the distance of the object that reflects the ultrasonic wave. By mounting the ultrasonic sensor in a suitable position and emitting ultrasonic waves in the direction in which the object is measured, the distance between the surface of the object and the sensor can be measured. Ultrasonic sensors have a transmitter and a receiver, but an ultrasonic sensor can also have the dual function of transmitting and receiving sound waves. The ultrasonic sensor converts electric energy and ultrasonic waves into each other by the principle of piezoelectric effect, that is, when the ultrasonic wave is emitted, the electric energy is converted and the ultrasonic wave is emitted; and when the echo is received, the ultrasonic vibration is converted into an electric signal.
2. The application of ultrasonic sensors in medicine The application of ultrasound in medicine is mainly to diagnose diseases, and it has become an indispensable diagnostic method in clinical medicine. The advantages of ultrasonic diagnosis are: no pain, no damage to the subject, simple method, clear imaging, high diagnostic accuracy.
3. Ultrasonic sensor in the measurement of liquid level The basic principle of ultrasonic measurement of liquid level is: the ultrasonic pulse signal emitted by the ultrasonic probe, propagates in the gas, is reflected after the interface between air and liquid, after receiving the echo signal Calculate the propagation time of the ultrasonic round-trip, which can be converted into the distance or liquid level. Ultrasonic measurement methods have many advantages unmatched by other methods: (1) without any mechanical transmission components, nor with the liquid to be tested, it is non-contact measurement, not afraid of electromagnetic interference, not afraid of strong corrosive liquids such as acid and alkali, so performance Stable, high reliability and long life; (2) Its short response time makes it easy to realize real-time measurement without hysteresis.
4. Application of ultrasonic sensor in ranging system Ultrasonic ranging generally has the following methods: 1 taking the average voltage of the output pulse, the voltage (the amplitude of which is basically fixed) is proportional to the distance, and the measured voltage can be measured; 2 Measure the width of the output pulse, that is, the time interval t between the transmitted ultrasonic wave and the received ultrasonic wave, so the measured distance is S=1/2vt. If the accuracy of the ranging is very high, it should be corrected by the method of temperature compensation. Ultrasonic ranging is suitable for high-precision mid-long distance measurements.
Third, the summary article mainly from the characteristics of ultrasonic and audible sound waves, discussed the principle and characteristics of ultrasonic sensors, and thus summarized the wide application of ultrasonic sensors in all aspects of production and life. However, ultrasonic sensors also have their own shortcomings, such as reflection problems, noise problems, and so on. Therefore, the further research and study of ultrasonic sensors is still of great value.
All our items Suitable for space like meeting room, living room as well as restaurant, leisure club,office etc;
And all are packed in singel neautral box safely, mass production in carton case approved by drop test. We can make custom logo and box for bulk cargos. Please click to contact us freely if you have the query. We have different shipping options for you: Express, Air, Sea. Please choose your favorite way, or you can also refers to our recommendation.
We have our own Control systems: Shorten lead times at low cost with responsive production planning and with many years experience of producing products.
We could provide OEM / ODM service for all kinds of customers. Our professional support team will service online 24 hours for customers.
We have a very strong quality control Samples are always available for checking quality and Efficient Logistics.
Professional Design Team: artwork/ Instruction manual/ product design according to customer's requirements.
Benefits of Ultrasonic Aroma Diffuser :
1. Relieving fatigue: Rich negative oxygenions make blood weak acidic, enhance resistance, and can adjust and improve
the symptoms of nervous weakness, headache, insomnia and depression caused by autonomic nervous disorder.
2. Improving the respiratory system: Improving lung function, increasing lung oxygen uptake by more than 20%,
excluding carbon dioxide by about 14.5%. It can treat pollinosis, allergic rhinitis, prevent respiratory diseases, some
respiratory diseases and some respiratory infectious diseases.
3. Accelerating metabolism: promoting tissue and cell activation, promoting blood circulation and metabolism.
4. Improvement of blood: increase of white blood cells, red blood cells, hemoglobin and platelets, increase of globulin,
increase of PH value, shorten the time of blood coagulation and increase of blood viscosity.
5.Boot your mood,help body heal itself.
Aroma Humidifier,Aroma Diffuser Humidifier,Best Ultrasonic Humidifier,Ultrasonic Cool Mist Humidifier
KIWA ELECTRONIC (HK) INDUSTRIES CO.,LTD , https://www.kiwahk.com