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The characteristics and working principles of Ultrasonic transducer

Date: 2022-10-27Number: 167

How the Ultrasonic transducer works

When an electrical signal is added to the transducer to produce sound waves, it vibrates across a specific spectrum. These sound waves fly, and if there are some obstacles, these sound waves will reflect the transducer's echo knowledge. The Echo is converted to an electrical pulse at the end of the transducer. The interval between the transmission of sound waves and the reception of an echo signal is determined here by the transducer. At 40 kHz, the Ultrasonic transducer emits an ultrasonic pulse through the air. These transducers are safer than infrared transducers because dust, black materials, etc. are not affected by these Ultrasonic transducer transducers. The Ultrasonic transducer is excellent at suppressing noise distortion.

Ultrasonic transducer

Characteristics of Ultrasonic transducer

1. Performance

The core of the ultrasonic probe is the piezoelectric chip in its plastic or metal shell. There are many kinds of materials that make up a chip. The size of the wafer, such as diameter, thickness, etc. is also different, so the performance of each probe is different, it is important to understand its performance before using. Key performance indicators of the Ultrasonic transducer include:

2. Frequency of operation

The operating frequency is the resonant frequency of the piezoelectric chip. When the frequency of AC voltage is equal to the resonant frequency of the chip, the output energy is the highest and the sensitivity is the highest.

3. Operating temperature

The Curie point of piezoelectric materials is generally high, especially for diagnostic ultrasound probes, which are low in power and operating at low temperatures and can operate for long periods of time without failure. The temperature of medical ultrasonic probe is relatively high, and it needs separate refrigeration equipment.

4. sensitivity

Depends largely on the fabrication of the wafer itself. The electromechanical coupling coefficient is large and the sensitivity is high; on the contrary, the sensitivity is low.

5. System components

The utility model is composed of a transmitting transducer, a receiving transducer, a control part and a power supply part. The transmitting transducer consists of an emitter and a ceramic vibrator transducer with a diameter of about 15mm. The function of the transducer is to convert the electric vibration energy of the ceramic vibrator into ultrasonic energy to radiate into the air, while the receiving transducer transmits energy by the ceramic vibrator. The transducer consists of an amplifier and an amplifier circuit. The receiving wave of the transducer generates mechanical vibration and converts it into electrical energy, which is used as the output of the transducer receiver to detect the transmitted super-electromagnetic wave. In practical use, the ceramic oscillator of the transmitter is also used. It can be used as a ceramic oscillator for receiving transducer company. The control part mainly controls the pulse chain frequency, duty cycle, sparse modulation, count detection distance and so on.

6. Work patterns

The Ultrasonic transducer uses an acoustic medium for non-contact and non-wear detection of the object being examined. The Ultrasonic transducer can detect transparent or non-ferrous objects, metallic or non-metallic objects, solids, liquids and powdered substances. Its detection performance is almost not affected by any environmental conditions, including smoke and dust environment and rainy days.

7. Pros and cons

Each system has its advantages and some disadvantages. The merits of Ultrasonic transducer are discussed here.

These Ultrasonic transducer can be tested in any form of material. They can detect a variety of textures.

Temperature, water, dust or any Ultrasonic transducer will not be affected.

The Ultrasonic transducer works well in a variety of environments.

It also measures elevated sensing distances.

The following are disadvantages of these converters:

The Ultrasonic transducer is susceptible to changes in temperature. The ultrasonic reaction will change this temperature change.

It may have problems reading reflections from small, thin, soft objects.

Type of Ultrasonic transducer

There are different types of Ultrasonic transducer available based on the arrangement of piezoelectric crystals, their area and frequency. They are:

The structure of a linear ultrasonic transducer, a piezoelectric crystal, is linear in this type of transducer.

Common ultrasonic-transducer-convex transducer is also known as this form. This type of piezoelectric crystal has a curved shape. These are better than depth testing.

Phased array Ultrasonic transducer-phased array transducers have a limited footprint and low frequency.

Once again, Ultrasonic transducer take different forms for non-destructive research. Contact Transducer, corner transducer, delay line transducer, immersion transducer and dual-component transducer.

Ultrasonic transducer applications

These sensors have many applications in different fields, such as automobiles and medical treatment. This helps locate the target, determine the distance from the object to the target, locate the object, quantify the level, and support the ultrasonic transducer.

In the medical field, Ultrasonic transducer are used for diagnostic tests, surgical instruments for cancer treatment, visceral exams, heart tests, eye and uterine Ultrasonic transducer.

Through these sensors, they can determine the distance of these objects to prevent collision in the aspects of production line management, liquid level monitoring, line break detection, personnel detection counting, automobile detection, etc. .