【摘要】 血液成分无创检测已成为生物医学工程领域关注的焦点和热点,其中以近红外血液成分检测最为突出,而动态光谱检测方法以能消除近红外血液成分检测中的个体差异和测量条件的影响备受研究者的青睐。但是,由于动态光谱检测系统要求较高的幅值精度和高的时间分辨率,因此要求所采用的CCD(charge coupled device)系统进行较长时间的实时输出,其数据量较大,需要匹配高速数据传输模块。文章介绍了一种基于CPLD(complex programmable logic device)的CCD数据采集系统,整个系统以CPLD为主芯片,它不仅为CCD提供工作时序信号,同时还控制信号调理、转换、传输模块中的采样率、相关双采样的时序和数据的存储与传输。采用CPLD器件不但简化了系统结构,提高了整个系统的速度,而且达到了幅值精度和时间分辨率的要求。更多还原

【Abstract】 The non-invasive detection blood component has being attracted significant interest in biomedical domain,where the method of near-IR spectroscopy is special.And the dynamic spectrum method can eliminate the main interference of the individual discrepancy and measure conditions.However,due to the requirement of excellent amplitude accuracy and high temporal resolution in spectrum data acquisition system,the CCD must have real time output,the data is large,and a high speed acquisition system is required.In the present paper a CCD data acquisition system based on CPLD is designed.The whole system is controlled by CPLD,which is used to supply CCD timing and controls signal disposal,transmission,sample rate and storage and transmission of data.The system structure is simplified and the speed is improved,and the system meets the requirements of time resolution.更多还原