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中文摘要：
近年来利用超声导波评价长骨状况已成为研究热点之一。但是超声导波信号在长骨的皮质骨层传播时会遭遇很大的衰减,尤其是当皮质骨层上附有软组织时,接收到的导波信号很小。为了提高信噪比,增大接收到的导波信号幅度,引入Golay码编码的超声信号作为激励。仿真结果表明,Golay码激励并解码后的L（0,5）导波模式与单脉冲激励得到的模式波形几乎完全一致,证明了利用Golay码作为激励,产生超声导波的可行性。在离体牛胫骨实验中,Golay码在提高信噪比的同时,还可以增加超声导波的测量距离。说明把Golay码应用到超声导波的测量上很有潜力。
英文摘要：
Using ultrasonic guided waves（GWs） to evaluate long bones has gained more and more attention recently.However,the GWs will suffer high attenuation when they propagate in cortical bone.It is hard to receive the guide waves,especially when there is soft tissue on the cortical bone.Therefore,in order to improve the signal to noise ratio（SNR） and amplitudes of the receiving signals,this paper proposes a method that uses Golay coded excitation to obtain GWs.In simulation,the L（0,5） mode was obtained through Golay coding and decoding,which is exactly the same as that excited by single pulse.This result suggests the feasibility of using Golay code to obtain GWs.In the experiment of bovine bones in vitro,the GW waveforms obtained from Golay coding and single pulse excitations basically agree with each other.Golay coding can improve the SNR and also can increase the measuring distance of GWs,which demonstrates that applying Golay coding to measure ultrasonic GWs has great potential.
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