基于FPGA的超声流速剖面测量系统设计  

Design of Ultrasonic Flow Velocity Profile Measurement System Based on FPGA

作　　者：叶宗英[1,2] 邱维宝[2] 池利阳[1,2] 牟培田 邹玉华[1] 

机构地区：[1]桂林电子科技大学电子工程与自动化学院,广西桂林541004 [2]中国科学院深圳先进技术研究院生物医学与健康工程研究所,广东深圳518055

出　　处：《压电与声光》2014年第5期810-813,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金青年基金资助项目(61302038)

摘　　要：血流速度的检测对于临床医学具有重要意义。该文提出了一种基于现场可编程逻辑门阵列(FPGA)的脉冲多普勒血流速度剖面测量系统。该系统使用LiNbO3压电换能器作为探头,利用FPGA控制超声脉冲的收发;设计出基于希尔伯特变换的数字正交解调器取代传统混频器对回波信号进行解调,并在FPGA中实现快速傅里叶变换完成了频谱分析。经实验验证,系统能测出血管仿体内的速度剖面,测量误差小于7%。Blood flow velocity detection is important for clinical medicine. An FPGA-based system of ultrasonic pulsed wave Doppler was proposed to measure blood flow velocity profile. A LiNbO：~ piezoelectric transducer was used as the probe to produce and receive ultrasonic pulses. The ultrasonic pulse recurrence frequency was controlled by FPGA. The conventional analog mixer was eliminated by the digital quadrature demodulator based on Hilbert transform for the echo signal demodulation. The spectrum analysis was realized in FPGA through the fast Fourier transform. The experiment verified that the proposed system can measure the velocity profile in blood vessel with the deviation of less than 7%.

关 键 词：现场可编程逻辑门阵列(FPGA) LiNbO3压电换能器 超声 脉冲多普勒 速度剖面 

分 类 号：TN912[电子电信—通信与信息系统] TP274[电子电信—信息与通信工程]