Multi-frequency probe is a new development of pulse-echo transducer. The probe can send out several different ultrasonic pulses, so as to cover the near field with high-frequency ultrasound, the intermediate-frequency ultrasound to cover the transition zone between the far and near fields, and the low-frequency ultrasound to cover the far field. The unit multi-frequency probe is to bond multiple layers of piezoelectric ceramics (or polymer piezoelectric materials) to each other, and lead wires from the electrodes between each layer to obtain multiple frequency ultrasonic pulse emission through exciting different layers . The digital coding of the multi-frequency probe is simple but easy to lose the signal.
The wide-band probe send out continuous ultrasonic pulse signals, so that the ultrasonic signals in a certain frequency range can be transmitted and received without gaps.
On the basis of the wide-band probe, the ultrasonic signal range that the probe receives and transmits is further expanded. The signal of the ultra-wideband probe is completely carried out at the moment of reception, and is fully digitally coded and amplified to ensure that the signal is not distorted and expand the dynamic range of the signal.
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