The sensitivity of the transducer and the impedance between the transducer and the internal resistance of the power supply
The matching is closely related & due to the detection of the acoustic load of the ultrasonic transducer (to be explored
The acoustic impedance rate of the measured object is seriously mismatched with the transducer material, and the sensitivity
Often low & In order to improve the sensitivity of the transducer, you need to use acoustic
Matching and circuit matching method & acoustic and electrical matching can make the frequency band of the transducer
Wider, the insertion loss is reduced, so the sensitivity of the transducer is improved.
In the case of the same excitation source and background noise, the signal-to-noise ratio is also improved.
In addition, in order to obtain the necessary resolution for small defects, ultra-
Acoustic transducers have high vertical and horizontal resolutions, etc. At present,
The main methods of high transducer longitudinal resolution include improving the transducer’s
Working frequency and improving the impulse response of the transducer to achieve narrow bandwidth
Pulse, in addition, acoustic and electrical matching can not only improve the sensitivity of the transducer,
And can improve the impulse response characteristics, thereby improving the longitudinal
Resolution, the lateral resolution of the ultrasonic inspection system is determined by the transducer
The width of the sound beam is determined, in order to improve the lateral resolution of the transducer,
The most effective way is to use focused ultrasound transducers, such as spherical
Piezoelectric focusing transducer, lens focusing transducer and phased array electronics
Focus transducer, etc.,
Tags: Ultrasonic core parts
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