Ultrasonic transducer, the technical problem to be solved is to design an ultrasonic transducer with large action distance and wide frequency.
The transducer consists of a shell, a matching layer, a piezoelectric ceramic disk transducer, a backing, an outgoing cable and a Cymbal array receiver. The piezoelectric ceramic disk transducer is made of PZT-5 piezoelectric material polarized in the thickness direction, and the Cymbal array receiver consists of 8 ~ 16 Cymbal transducers, two metal rings and rubber washers. The working distance of the invention is greater than 35m, and the frequency band width reaches 10kHz, so it can detect long-distance targets moving at high speed.
Chinese name: ultrasonic transducer mbth: ultrasonic transducer principle: piezoelectric effect of materials Uses: converting high-frequency electric energy into mechanical energy types: basic information of energy conversion device, frequently asked questions, application, piezoelectric ceramic transformer, ultrasonic motor, ultrasonic cleaning, ultrasonic welding, ultrasonic machining, ultrasonic weight loss, ultrasonic breeding, electronic sphygmomanometer, telemetry and remote control, traffic monitoring, ranging, leak detection and gas detection, An ultrasonic transduce with information acquisition and basic data function structure comprises a shell (1), a matching lay, namely an acoustic window (2), a piezoelectric ceramic disk transducer (3), a backing (4) and an outgoing cable (5), and is characterized by also comprising a cymbal array receiver. The cymbal array receiver is located on the disc piezoelectric transducer 3; Piezoelectric ceramic disk transducer, as a basic ultrasonic transducer, transmits and receives ultrasonic signals; The Cymbal array receiver is located above the disk piezoelectric transducer, and is used as an ultrasonic receiver to receive Doppler echo signals outside the frequency band of the disk transducer. Mainly suitable for ultrasonic plastic welding machine, ultrasonic metal welding machine, ultrasonic cleaning machine, aerial camera, chlorine trichloride machine and other common problems. 1, the ultrasonic vibrator is wet. You can use a megger to check the plug of the wire connecting the transducer, and you can judge the basic situation by checking the insulation resistance. Generally, the insulation resistance is required to be greater than 5 megohms. If the insulation resistance does not reach this value, it is generally that the transducer is damp. You can put the whole transducer (excluding the plastic-sprayed shell) in an oven and leave it at 100℃ for 3 hours, or use a hair dryer to remove water until the resistance is normal. 2. When the transducer vibrator strikes fire and the ceramic material breaks, it can be checked with naked eyes and megger. Generally, as an emergency treatment measure, individual damaged vibrators can be disconnected without affecting the normal use of other vibrators. Vibrator degumming, our transducer adopts the double guarantee process of bonding and screw fastening, which will not happen under normal circumstances. Vibration surface perforation of stainless steel. Generally speaking, when the sensor is used at full load for 10 years, the vibration surface may be perforated. Ultrasonic transducers are widely used, which can be divided into industry, agriculture, transportation, life, medical treatment and military affairs. According to the realized functions, it can be divided into ultrasonic machining, ultrasonic cleaning, ultrasonic detection, detection, monitoring, telemetry and remote control. According to the working environment, it is divided into liquid, gas and organism. According to the nature, it can be divided into power ultrasound, detection ultrasound and ultrasonic imaging. Piezoelectric ceramic transformer Piezoelectric ceramic transformer uses the piezoelectric effect of polarized piezoelectric body to realize voltage output. The input part is driven by sinusoidal voltage signal, which makes it vibrate by inverse piezoelectric effect. The vibration wave is mechanically coupled to the output part through the input and output parts, and the output part generates charge through the positive piezoelectric effect, thus realizing the two-time conversion of electric energy-mechanical energy-electric energy of the piezoelectric body and obtaining the highest output voltage at the resonant frequency of the piezoelectric transformer. Compared with electromagnetic transformer, it has the advantages of small volume, light weight, high power density, high efficiency, breakdown resistance, high temperature resistance, no fear of combustion, no electromagnetic interference and electromagnetic noise, simple structure, easy manufacture and mass production, etc., and has become an ideal substitute component for electromagnetic transformer in some fields. This kind of transformer is used in switching converters, notebook computers, neon drivers and so on. Ultrasonic motor Ultrasonic motor uses the stator as the transducer, which makes the motor stator vibrate at ultrasonic frequency by using the inverse piezoelectric effect of piezoelectric crystal, and then transfers energy through the friction between the stator and the rotor to drive the rotor to rotate. The ultrasonic motor has the advantages of small volume, large torque, high resolution, simple structure, direct drive, no braking mechanism and no bearing mechanism, which is beneficial to the miniaturization of the device. Ultrasonic motors are widely used in optical instruments, lasers, semiconductor microelectronics, precision machinery and instruments, robots, medicine and bioengineering. Ultrasonic cleaning The mechanism of ultrasonic cleaning is to use the physical effects such as cavitation, radiation pressure and acoustic flow when ultrasonic waves propagate in cleaning solution to peel off the machinery generated by dirt at the cleaning site, and at the same time, it can promote the chemical reaction between cleaning solution and dirt to achieve the purpose of cleaning objects. The frequency of ultrasonic cleaning machine can be 10 ~ 500 kHz, generally 20 ~ 50 kHz according to the size and purpose of the cleaning object. With the increase of the frequency of ultrasonic transducer, the wave bay vibrator, longitudinal vibrator and thickness vibrator can be used. In miniaturization, radial vibration and bending vibration of disk vibrator are also used. Ultrasonic cleaning has been widely used in various industries, such as agriculture, household equipment, electronics, automobiles, rubber, printing, airplanes, food, hospitals and medical research. Ultrasonic welding Ultrasonic welding includes ultrasonic metal welding and ultrasonic plastic welding. Among them, ultrasonic plastic welding technology has been widely used. It uses the ultrasonic vibration generated by the transducer to transfer the ultrasonic vibration energy to the welding area through the upper welding piece. Because of the large acoustic resistance in the welding area, that is, the joint of two weldments, local high temperature will be generated to melt the plastic, and the welding work will be completed under the action of contact pressure. Ultrasonic plastic welding can facilitate the welding of parts that cannot be welded by other welding methods. In addition, it also saves the expensive mold cost of plastic products, shortens the processing time, improves the production efficiency, and has the characteristics of economy, rapidity and reliability. Ultrasonic machining is to add a fine abrasive with a certain static pressure to the workpiece together with the ultrasonic machining tool to process the same shape as the tool. During machining, the transducer needs to generate the amplitude of 15 ~ 40 microns at the frequency of 15~ 40 kHz. Ultrasonic tools make the abrasive on the surface of the workpiece impact continuously with considerable impact force, destroy the ultrasonic radiation part, and break the material to achieve the purpose of removing the material. Ultrasonic machining is mainly used in the processing of brittle and hard materials such as gems, jade, marble, agate and cemented carbide, as well as the processing of special-shaped holes and micro-deep holes. In addition, the accuracy and efficiency can also be improved by adding an ultrasonic transducer to the common tool for vibration. Ultrasonic weight loss is to use the cavitation effect and micromechanical vibration of ultrasonic transducer to break the excess fat cells under the human epidermis and excrete them after emulsification, so as to achieve the purpose of weight loss and shaping. This is a new technology developed in the 1990s. Zoh i of Italy used ultrasonic degreasing in bed for the first time, and it succeeded, creating a precedent for plastic surgery. Ultrasonic degreasing technology has developed rapidly at home and abroad. Ultrasonic breeding can improve germination rate, reduce mildew rate, promote seed growth and increase plant growth rate by irradiating plant seeds with appropriate frequency and intensity. According to the data, ultrasonic wave can increase the growth rate of some plant seeds by 2 ~ 3 times. The electronic sphygmomanometer uses an ultrasonic sensor to receive the pressure of blood vessels. When the balloon is pressed against the blood vessel, the ultrasonic transducer cannot feel the pressure of the blood vessel because the applied pressure is higher than the vasodilation pressure. When the balloon gradually deflates and the pressure of the ultrasonic transducer on the blood vessel decreases to a certain value, the two pressures reach a balance. At this time, the ultrasonic transducer can feel the pressure of blood vessels, that is, the systolic pressure of the heart, and send out an indication signal through the amplifier to give the blood pressure value. Electronic sphygmomanometer can reduce the labor intensity of medical staff because it cancels the stethoscope. Telemetry and remote control in toxic, radioactive and other harsh environments, people can not work at close range and need remote control; Television, electric fans, lights and other electrical switches need remote control, and they can all be equipped with ultrasonic transducers. By transmitting ultrasonic waves remotely, they are received by a receiving transducer installed on the system to be controlled, and acoustic signals are converted into electrical signals to operate the switch. Traffic Monitoring Modern traffic, in order to grasp the running situation of vehicles, it is very necessary to automatically monitor the passing and counting of vehicles. For example, if the traffic supervision station is equipped with an ultrasonic transducer and its auxiliary equipment, an acoustic pulse will be returned when vehicles pass by, and the number of vehicles per day can be obtained by counting and accumulating. Installing a dual-purpose transducer at the rear of the car can prevent the accident of reversing collision. The noise index can also be monitored by installing a receiving piezoelectric ultrasonic transducer on the expressway. Ranging ultrasonic rangefinder is also called ruler. It measures the pulse time interval through a dual-purpose sensor. The sound scale can measure the distance within 10m, and the accuracy can reach several thousandths. Leak detection and gas detection For the pressure system, at the leak, the injection noise is caused by the pressure difference inside and outside the pressure vessel. This noise has a wide spectrum. For non-pressure systems, the ultrasonic source can be placed in a closed system and then received from the outside of the closed system. Generally, there is little or no signal amplitude measured when there is no leakage, and the signal amplitude suddenly increases at the leakage place. Gas flow detection is also one of the important means in chemical industry. At present, there are many magnifications for flow detection, such as float flowmeter. But the main advantage of using ultrasonic transducer is that it will not hinder the flow of fluid. In order to realize the function of walking freely in space and identifying objects, the intelligent robot used for information acquisition should not only use ultrasonic transducer to measure distance and guide blindness, but also image and identify. Therefore, a small ultrasonic transducer array is needed to achieve multiple functions, which will become an important research topic and attract many scientists to fight for it.