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Ultrasonic testing transducers are mostly working in transient state & transduction
The study of the transient characteristics of the sensor is actually to explore the
The characteristics of signal transmission under the number, mainly include the following parts &
First, the probe is excited by a known electric pulse and generates
Ultrasonic impulse response characteristics & second, in a known ultrasonic pulse
Under the action of impulse, the electrical impulse response characteristic of the ultrasonic probe
3. Under the action of a known electric pulse, the probe generated in the load
The ultrasonic pulse is reflected by the interface and then received by the probe.
Impulse response characteristics, etc. & the above three conditions are also commonly referred to
Ultrasonic transmission, reception and transmission and reception characteristics & ultrasonic probe
Characteristics, not only with the structure of the probe (backing, piezoelectric sheet, matching layer and
Protective film) and working mode (longitudinal wave, transverse wave, surface wave and plate wave, etc.)
It is related to the internal resistance of the ultrasonic generator and the input resistance of the receiver.
The resistance is related to the waveform of the excitation signal (the voltage at the time of transmission)
Waveform and incident sound wave waveform during reception) etc.
The complete analysis content of the probe transient characteristics is quite rich
, And compared with the steady-state characteristics of the transducer, the transient characteristics of the transducer
Sexual analysis is much more complicated.
The detection of ultrasonic transducers requires high sensitivity and signal-to-noise ratio.
When the noise level is constant, the methods to increase the useful signal include
Two, one is to increase the excitation source voltage, that is, to increase the emitted sound power
Rate, but this must be limited, because increasing sound power
May cause harm to the detected object or human body, but also increase
The difficulty of the circuit & the second method is to improve the sensitivity of the transducer
This is an important indicator to measure the quality of ultrasonic transducers.

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