As we all know, the ultrasonic transducer converts the input electric power into mechanical power and then transmits it, and consumes a small part of the power itself. Let me talk about the directivity of the ultrasonic transducer.
Ultrasonic transducers have sharp directivity, which is conducive to concentrating the emitted energy, can obtain a higher signal-to-noise ratio when receiving, and is also conducive to the positioning and evaluation of the detection target. Ultrasonic welding machine manufacturers indicate that the ultrasonic transducer is related to its radiating surface size, structure, working frequency and characteristics of the sound transmission medium, and most of them can use directivity factors to reflect the directivity of the ultrasonic transducer.
The so-called directivity factor means that on the main axis sound pressure of the emitted sound beam, the mean square sound pressure of a certain frequency at a certain point far away from the transmitting ultrasonic transducer is the same as a point on the sphere concentric with the transducer through that point The ratio of the mean square sound pressure of the frequency. For the receiving ultrasonic transducer, the horn manufacturer indicates the ratio of the square value of the electromotive force generated by the sound wave of a certain frequency along the main axis of the transducer to the square value of the electromotive force generated by the same frequency and the same root mean square sound pressure. .
It is stated that the directivity factor of an ultrasonic transducer can be expressed in decibels (dB), which is equivalent to the common logarithm of the directivity factor multiplied by 10.
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