摘要
对于实时成像系统,锁相放大器的低通滤波环节是影响系统响应速度的关键因素。基于理想运算放大器模型所构建的低通滤波器,未考虑非理想器件参数的影响,所设计出的低通滤波器响应性能并不理想。研究非理想运算放大器对滤波器响应时间的影响,并编制了基于MATLAB的软件包,用于计算其最优参数值,以构建所需滤波器,提高成像系统的实时性。
For online imaging systems,the lock-in amplifier （LIA）with the low pass filter （LPF）is the main obstacle for faster performance. When designing the LPF based on ideal Op Amps,the coupling effects of nonideal Op Amps are omitted, resulting in dissatisfactory performance of LPF.The influence of non-ideal Op Ampson performance of LPF is studied and a software package in MATLAB environment is developed to calculate the optimum R and C and improve the speed of lock-in amplifiers in online process tomography systems, so as to fasten the image reconstructing speed.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2005年第7期684-688,704,共6页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(603010008
50337020
60472077)
国家高科技研究发展计划研究专项经费(20001AA413210)资助项目。
