基于STM32的脉搏信号采集系统设计

发布时间：2019-03-28 16:35

【摘要】：脉搏波中体现的人体生理病理信息,一直都被中外医学界所重视。全面分析脉搏波的形态、强度、速率和节律等,可知其能反映人体心血管系统中许多生理病理的血流特征。对脉搏波进行信号转换,以便对脉象有一个客观的分辨标准,从而为预防和治疗疾病提供参考。本文设计了一种脉搏信号采集系统,实现了对脉搏信号的提取、放大滤波、下位机显示、报警及上位机显示等功能,其主要研究内容如下：(1)本文设计脉搏信号调理电路对由HK-2000B脉搏传感器采集的脉搏信号进行一级放大、陷波处理、带通滤波、二级放大等处理,这样不仅提高了信号的幅度,而且也能滤除多种杂波的干扰。(2)本文采用STM32处理器自带的12位高精度AD转换器,对经脉搏信号调理电路处理后的模拟脉搏信号进行数字滤波、脉搏频率计算等处理。并由LCD液晶屏显示波形及脉搏率,在脉搏频率超过限定范围时可由蜂鸣器报警提示。(3)本文使用具有较好图形界面设计及数字信号处理能力的Lab VIEW进行上位机界面设计,下位机通过串口将处理后的脉搏信号传送至上位机。上位机实现对采集者信息的存储、串口通信设置、对脉搏波信号进一步处理显示、存储及回放。本文设计的脉搏信号采集系统具有功耗低、便携等特点,软硬件结合而达到良好的滤波效果,使得采集的脉搏信号更加精确。下位机的显示功能使采集者能更加清晰直观地观察到自己脉搏的变化,上位机对采集者信息的存储、脉搏波形的显示、存储与回放能使医生更方便地对采集者的脉搏波形进行观察分析,及详细了解病情。
[Abstract]:The physiological and pathological information of human body reflected in pulse wave has always been paid attention to by Chinese and foreign medical circles. A comprehensive analysis of the shape, intensity, velocity and rhythm of the pulse wave shows that it can reflect many physiological and pathological blood flow characteristics in the human cardiovascular system. The pulse wave signal conversion is carried out in order to have an objective discrimination standard for pulse pattern, thus providing reference for the prevention and treatment of diseases. In this paper, a pulse signal collection system is designed, which realizes the functions of extracting pulse signal, amplifying filtering, displaying the lower computer, alarming and displaying the upper computer, and so on. The main research contents are as follows: (1) the pulse signal conditioning circuit is designed in this paper to process the pulse signal collected by the HK-2000B pulse sensor, such as primary amplification, notch processing, band-pass filtering, secondary amplification and so on. This can not only improve the amplitude of the signal, but also filter out the interference of a variety of clutter. (2) in this paper, a 12-bit high-precision AD converter with STM32 processor is adopted. The analog pulse signal processed by pulse signal conditioning circuit is processed by digital filtering and pulse frequency calculation. The waveform and pulse rate can be displayed by LCD screen, and can be alerted by buzzer when the pulse frequency exceeds the limit range. (3) in this paper, we use Lab VIEW, which has good graphic interface design and digital signal processing ability, to design the upper computer interface. The lower computer transmits the processed pulse signal to the upper computer through the serial port. The host computer can store the information of the collector, set up the serial communication, and display, store and replay the pulse wave signal further. The pulse signal acquisition system designed in this paper has the characteristics of low power consumption, portable and so on. The combination of hardware and software can achieve a good filtering effect, which makes the collected pulse signal more accurate. The display function of the lower computer enables the collector to observe more clearly and intuitively the change of his pulse, the storage of the information of the collector by the upper computer, and the display of the pulse waveform. Storage and playback can make it easier for doctors to observe and analyze the pulse waveform of the collector and to understand the condition in detail.
【学位授予单位】：西北师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：R443;TP274.2

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