What Is an Ultrasonic Transducer?

The function of the ultrasonic transducer is to convert the input electric power into mechanical power (ie, ultrasonic waves) and then transfer it out, while consuming a small part of the power itself.

For the ultrasonic transducer, the technical problem to be solved is to design an ultrasonic transducer with a large working distance and a high frequency bandwidth.

The transducer consists of a housing, a matching layer, a piezoelectric ceramic disc transducer, a backing, a lead-out cable, and a Cymbal array receiver. The piezoelectric ceramic disc transducer is made of PZT-5 piezoelectric material polarized in the thickness direction. The Cymbal array receiver is composed of 8 to 16 Cymbal transducers, two metal rings and a rubber washer. The working distance of the invention is greater than 35m, and the frequency band width reaches 10kHz, which can detect long-distance targets moving at high speed.

Chinese name: Ultrasonic transducer
Foreign name: Ultrasonic transducer

Principle: Piezoelectric effect of materials
Use: Converting high-frequency electrical energy into mechanical energy
Types of: Energy conversion device

Basic information of ultrasonic transducer

Functional structure

Ultrasonic transducers (3 photos)

The ultrasonic transducer includes a shell (1), a matching layer, that is, a sound window (2), a piezoelectric ceramic disc transducer (3), a backing (4), and a lead-out cable (5). Cymbal array receiver, which consists of the outgoing cable (6), 8 to 16 Cymbal transducers (7), metal rings (8), (9), and rubber washers (10); the Cymbal array receiver is located on the disc The piezoelectric ceramic disc transducer 3 is used above; the piezoelectric ceramic disc transducer is used as the basic ultrasonic transducer, which transmits and receives ultrasonic signals; the Cymbal array receiver is located above the disc piezoelectric transducer, As an ultrasonic receiver, it is used to receive Doppler echo signals outside the frequency band of the disc transducer.

Mainly suitable for ultrasonic plastic welding machine, ultrasonic metal welding machine, ultrasonic cleaning machine, air camera, trichloride machine, etc.

Ultrasonic transducer faq

1. The ultrasonic vibrator is damp. You can use a megohmmeter to check the plug connected to the transducer. You can determine the basic situation by checking the insulation resistance value. Generally, the insulation resistance is greater than 5 megohms. If this insulation resistance value is not reached, the transducer is generally damp. You can put the entire transducer (excluding the plastic spray case) in an oven and set it to dry at about 100 ° C for 3 hours or use a hair dryer to dampen it to the resistance value. So far.

2. The transducer vibrator fires and the ceramic material is broken. It can be inspected with the naked eye and the megohmmeter. Generally it is used as an emergency treatment measure to disconnect individual damaged vibrators without affecting the normal use of other oscillators.

The transducer is de-glued. Our transducer is double-guaranteed with cementation and screw fastening. This situation does not occur under normal circumstances.

Stainless steel vibrating surface is perforated. Generally, the transducer may be perforated when it is used for 10 years at full load.

Ultrasonic transducer application

Ultrasonic transducers are widely used. They are divided into industries, agriculture, transportation, living, medical and military according to the industries they are applied to. According to the functions realized, it is divided into ultrasonic processing, ultrasonic cleaning, ultrasonic detection, detection, monitoring, telemetry, remote control, etc .; according to the working environment, it is divided into liquid, gas, living organisms, etc .; it is divided into power ultrasound, detection ultrasound, ultrasound imaging, etc. .

Ultrasonic transducer piezoelectric ceramic transformer

Piezoelectric ceramic transformers use the piezoelectric effect of the polarized piezoelectric body to achieve voltage output. The input part is driven by a sinusoidal voltage signal, which causes it to vibrate through the inverse piezoelectric effect. The vibration wave is mechanically coupled to the output part through the input and output parts, and the output part generates electric charges through the positive piezoelectric effect to realize the electrical energy of the piezoelectric body. -Mechanical energy-Two conversions of electrical energy to obtain the highest output voltage at the resonant frequency of the piezoelectric transformer. Compared with electromagnetic transformers, this has a small size, light weight, high power density, high efficiency, breakdown resistance, high temperature resistance, no fear of combustion, no electromagnetic interference and electromagnetic noise, and simple structure, easy to produce, and easy to mass produce. Some areas have advantages such as being an ideal replacement component for electromagnetic transformers. This type of transformer is used in switching converters, notebook computers, neon lamp drivers, etc.

Ultrasonic transducer ultrasonic motor

The ultrasonic motor uses the stator as a transducer. The inverse piezoelectric effect of the piezoelectric crystal is used to place the motor stator at ultrasonic frequency vibration. Then the friction between the stator and the rotor transmits energy to drive the rotor to rotate. Ultrasonic motor has small volume, large torque, high resolution, simple structure, direct drive, no braking mechanism, no bearing mechanism, these advantages are beneficial to the miniaturization of the device. Ultrasonic motors are widely used in the fields of optical instruments, lasers, semiconductor microelectronics processes, precision machinery and instruments, robotics, medicine and biological engineering.

Ultrasonic transducer ultrasonic cleaning

The mechanism of ultrasonic cleaning is to use the physical effects such as cavitation, radiation pressure, and sound flow when ultrasonic waves propagate in the cleaning solution, to mechanically exfoliate the dirt on the cleaning parts, and at the same time, to promote the chemical reaction between the cleaning fluid and the dirt. React to achieve the purpose of cleaning objects. The frequency used by the ultrasonic cleaning machine can be selected from 10 to 500 kHz according to the size and purpose of the cleaning object, generally 20 to 50 kHz. With the increase of the frequency of the ultrasonic transducer, Langzhiwan oscillator, longitudinal oscillator, thickness oscillator, etc. can be used. In terms of miniaturization, there are also radial vibrations and flexural vibrations using a wafer vibrator. Ultrasonic cleaning has been widely used in various industries, agriculture, household equipment, electronics, automobiles, rubber, printing, aircraft, food, hospital and medical research industries.

Ultrasonic transducer ultrasonic welding

There are two types of ultrasonic welding: 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 transmit the ultrasonic vibration energy to the welding area through the upper welding piece. Due to the large acoustic resistance at the welding zone, that is, the junction of the two weldments, local high temperatures will cause the plastic to melt, 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 expensive mold costs for plastic products, shortens processing time, improves production efficiency, and is economical, fast, and reliable.

Ultrasonic Transducer Ultrasonic Processing

By adding the fine abrasive with the ultrasonic processing tool to the workpiece under a certain static pressure, the same shape as the tool can be processed. During processing, the transducer needs to generate an amplitude of 15 to 40 microns at a frequency of 15 to 40 kHz. The ultrasonic tool continuously impacts the abrasive on the workpiece surface with a considerable impact force, destroys the ultrasonic radiation part, and breaks the material to achieve the purpose of removing the material. Ultrasonic processing 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 shaped holes and fine deep holes. In addition, adding ultrasonic transducer vibration to ordinary cutting tools can also improve accuracy and efficiency.

Ultrasound Transducer

Utilizing the cavitation effect and micromechanical vibration of the ultrasonic transducer, the excess fat cells under the human epidermis are broken and emulsified and discharged out of the body to achieve the purpose of weight loss and shaping. This is a new technology developed internationally in the 1990s. Zocch i in Italy applied ultrasonic degreasing to the bed for the first time and succeeded, setting a precedent for plastic surgery and beauty. Ultrasonic degreasing technology has developed rapidly at home and abroad.

Ultrasonic transducer ultrasonic breeding

Ultrasonic irradiation with appropriate frequency and intensity on plant seeds can increase the germination rate of seeds, reduce the rate of mold rot, promote the growth of seeds, and increase the growth rate of plants. According to data, ultrasound can increase the growth rate of some plant seeds by 2 to 3 times.

Ultrasonic transducer electronic sphygmomanometer

The ultrasonic transducer is used to receive the pressure of the blood vessel. When the balloon is pressurized to tightly press the blood vessel, the ultrasonic transducer cannot feel the pressure of the blood vessel because the applied pressure is higher than the vasodilation pressure; and when the balloon is gradually deflated, the ultrasonic transducer When the pressure of the blood vessel decreases to a certain value, the pressure of the two reaches an equilibrium. At this time, the ultrasonic transducer can feel the pressure of the blood vessel. This pressure is the systolic pressure of the heart. Take out the blood pressure value. The elimination of the stethoscope on the electronic sphygmomanometer can reduce the labor intensity of medical staff.

Ultrasonic transducer telemetry remote control

In toxic, radioactive and other harsh environments, people can not work close to it and need to be controlled remotely; televisions, fans and electric lights and other electrical switches need to be remotely controlled, and they can be equipped with ultrasonic transducers. Received by the receiving transducer on the control system, converts the acoustic signal into an electric signal to make the switch act.

Ultrasonic transducer traffic monitoring

In modern transportation, it is necessary to automatically monitor the traffic and counting of vehicles in order to grasp the operation of the vehicles. For example, a traffic supervision station is installed with a dual-use ultrasonic transducer and its auxiliary equipment. When the vehicle passes, there will be an acoustic pulse return, and the number of daily vehicles can be obtained by counting and accumulating. Install a dual-use transducer at the rear of the car to prevent a rear-end collision. Installing a receiving piezoelectric ultrasonic transducer on the road can also monitor the noise figure.

Ultrasonic transducer ranging

The ultrasonic ranging device is also called a sound ruler. It measures the time interval of pulses through a dual-use transducer. The sound scale can measure distances within 10m, and the accuracy can reach a few thousandths.

Leak detection and gas detection of ultrasonic transducer

For pressure systems, jet noise is caused by the pressure difference between the inside and outside of the pressure vessel at the leak. This noise spectrum is extremely wide. For non-pressure systems, place an ultrasonic source inside the closed system and receive it from outside the closed system. Generally, the amplitude of the signal measured when there is no leakage is very small or absent, and the signal amplitude has a tendency to increase suddenly at the leak. Gas flow detection is also one of the important methods in chemical industry. There are various amplifications for flow detection, such as float flow meters. However, the main advantage of using an ultrasonic transducer is that it does not hinder the flow of fluid.

Ultrasonic transducer information acquisition

Intelligent robots must realize the functions of walking freely in space and recognizing objects. They must not only use ultrasonic transducers to measure blindness, but also to identify images. Therefore, a small ultrasonic transducer array is needed to achieve multiple functions. This aspect will become an important research topic and attract many scientists to fight for it.