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为了提高医学超声内窥镜系统的探测深度和成像质量,将广泛应用于雷达系统的编码激励技术引入到超声成像系统中,采用编码脉冲信号激励超声换能器,以增加超声发射功率,提高回波信号信噪比。在分析编码激励原理和超声换能器暂态工作特性的基础上,设计并实现了超声信号的4 bit Barker编码脉冲发射。实验中,激发电路输出的编码激励信号与超声换能器的暂态工作特性吻合;玻璃杯壁的反射超声回波信号,具备编码特征,与Matlab仿真结果相同,且幅度较强。
In order to improve the detection depth and imaging quality of medical ultrasound endoscope system, the coding excitation technology widely used in radar system is introduced into the ultrasound imaging system, and the encoded pulse signal is used to excite the ultrasound transducer to increase the ultrasound transmitting power and improve the imaging quality Wave signal signal to noise ratio. Based on the analysis of coding excitation principle and transient performance of ultrasonic transducer, a 4 bit Barker coded pulse transmission of ultrasonic signal was designed and realized. In the experiment, the code excitation signal output by the excitation circuit is in good agreement with the transient performance of the ultrasonic transducer. The reflection ultrasonic echo signal of the glass wall has the coding characteristic, which is the same as the Matlab simulation result, and the amplitude is strong.