改进型呼吸体积描记系统的硬件设计与研究

摘要

目的：设计一种改进型的呼吸体积描记技术(RIP)测量系统，解决目前的RIP测量系统适应性差和抗噪声能力较弱等问题。方法：采用XILINX公司的CPLD芯片作为高精度恒流源电路的控制芯片，并通过滤波、前置放大、锁相放大、自动控制放大、模拟数字转换电路和TI公司的16位MCU等构成的微弱生理信号放大检测硬件平台对人体的呼吸信号进行检测。结果：实验测试结果表明，本系统检测的潮气量与呼吸频率等呼吸参数与现行的肺功能仪(PN)有显著的正相关性。结论：改进型的RIP测量系统具有检测人体呼吸参数的能力，测量精确，操作简单，可作为便携式的呼吸检测平台。%Objective: To design an improved RIP system for solving the problems of low adaptability for application, low anti-noise performance and others. Methods: To utilize the CPLD from XILINX Int as the controlling MCU for high-precision constant current source circuits, the low-pass filter, pre-amplifier, automatic gain control amplifier and an analog to digital converter circuits along with a 16-bit MCU from TI corporation as the hardware platform for detecting the weak biological signal. Results:The results of the ventilation, breath rate and other respiratory parameters from our system have a high positive correlation with those from pneumotachograph. Conclusion:The system has a good performance on measuring respiratory parameters with a high accuracy, simple operations and good portability.