LIU Bo, GUO Jian-zhong. Research on SNR Improvement in Ultrasonic Imaging by Coded Excitation with Carrier Modulation[J]. Acta Electronica Sinica, 2011, 39(11): 2701-2707.
LIU Bo, GUO Jian-zhong. Research on SNR Improvement in Ultrasonic Imaging by Coded Excitation with Carrier Modulation[J]. Acta Electronica Sinica, 2011, 39(11): 2701-2707.DOI:
Considering the frequency spectrum of the piezoelectric ceramic transducer
this study uses a bi-phase coding signal modulated by a sine carrier as the excitation mode.Through using Barker code signal with each chip modulated by different periods of carrier
the transducer effect on the exciting signal and compression result is analyzed
modulation parameter is optimized
and the best matching mode between the exciting signal and the transducer is discussed.The echo of four target wires is processed by pulse compression with the optimum signal
the result shows that this excitation mode has a good performance on the transducer response
and it can enhance the SNR of the ultrasonic signal significantly.