一种便携式多普勒胎心检测系统的设计及实现

摘要

本研究设计并实现了一款便携式,全数字,用于围产期胎儿心率检测的多普勒胎心系统,其采用对超声回波加窗,数字相乘等方法获取频移信号,并可对特定组织深度进行运动检测.该系统由CPLD超声激励及采集电路、MCU及外围电路和系统软件三部分组成.与两款商用胎心仪相比,本系统准确度较高,能够稳定可靠的对胎心进行检测.%A novel, fully-digital and portable FHR measuring system that could be applied for FHR detection was designed.Digital multiplication methods and windowed ultrasonic echo were adopted to obtain the doppler frequency shift signal that could be detected at specific depths of tissue.This proposed system included three portions, namely: (1) CPLD ultrasonic excitation and acquisition circuit, (2) MCU and peripheral circuit, and (3) the system software.And the experimental results prove that the proposed system can be a stable and reliable alternative for the measurement of FHR, in comparison with two commercial fetal heart measuring instruments.