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What’s Hannas Ultrasonic Transducer Sensor

Views: 4     Author: Site Editor     Publish Time: 2021-04-28      Origin: Site

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Ultrasonic waves propagate in a straight line. The frequency is the higher , the diffraction ability is the weaker, but the stronger the reflection ability. For this reason, ultrasonic sensors can be made using this property of ultrasonic waves. In addition, the propagation speed of ultrasonic waves in the air is slow, which makes the use of ultrasonic sensors simple.


Ultrasonic sensors are developed by using the characteristics of ultrasonic waves. Ultrasonic range transducer is a mechanical wave with a higher vibration frequency than sound waves. It is generated by the vibration of the transducer chip under the excitation of voltage. It has high frequency, short wavelength, small diffraction phenomenon, especially good directivity, and can be directed into rays. Dissemination and other characteristics. Ultrasound has a great ability to penetrate liquids and solids, especially in solids that are opaque to sunlight. It can penetrate to a depth of tens of meters. When the ultrasonic wave hits the impurity or the interface, it will produce a significant reflection to form an echo, and it can produce a doppler effect when it hits a moving object. Therefore, ultrasonic testing is widely used in industry, national defense, biomedicine and other aspects. Ultrasound is used as a detection method, and it is necessary to generate and receive ultrasonic waves. The device that accomplishes this function is an ultrasonic sensor, which is habitually called an ultrasonic transducer, or an ultrasonic probe.


The ultrasonic sensor is mainly composed of a bimorph vibrator, a conical resonance plate and an electrode. When a certain voltage is applied between the two electrodes, the piezoelectric wafer will be compressed to produce mechanical deformation. After the voltage is removed, the piezoelectric wafer will return to its original state. If a pressure voltage is applied between the two poles at a certain frequency, the piezoelectric wafer will also vibrate at a certain frequency. After testing, the natural frequency of this type of piezoelectric chip is 38 KHz, and a square wave pulse signal with a frequency of 40 KHz is applied to the two poles. At this time, the piezoelectric chip resonates and emits ultrasonic waves. In the same way, an Piezoelectric ultrasonic range transducer without an external pulse signal will also resonate when the resonant plate receives ultrasonic waves, generating an electrical signal between the two poles.


The ultrasonic probe is mainly composed of piezoelectric wafers, which can transmit and receive ultrasonic waves. Low-power ultrasound probes are mostly used for detection. It has many different structures, which can be divided into straight probe (longitudinal wave), oblique probe (transverse wave), surface wave probe (surface wave), lamb wave probe (lam wave), double probe (one probe reflection, one probe reception) Wait. The core of the ultrasound probe is a piezoelectric chip in its plastic or metal jacket. There can be many kinds of pzt materials that make up the wafer. The size of the piezoelectric wafer, such as diameter and thickness are also different, so the performance of each ultrasonic probe is different, we know its performance before application. There are main performance indicators of ultrasonic sensors.


(1) Operating frequency.

The working frequency is the resonance frequency of the piezoelectric wafer,When the frequency of the AC voltage applied to its two ends is equal to the resonance frequency of the piezoelectric chip, the output energy is large and the sensitivity is high.


(2) Working temperature.

Because the curie point of piezoelectric materials ultrasonic distance transducer is generally relatively high, especially when the ultrasonic transducers are used for diagnosis uses low power, the working temperature of piezo ceramics are relatively low, and it can work for a long time without failure. The temperature of medical ultrasound probes is relatively high and requires separate refrigeration equipment.


(3) Sensitivity.

It is mainly depends on the manufacturing wafer itself. The electromechanical coupling coefficient is large and the sensitivity is high, on the contrary, the sensitivity is low.


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