广东工业大学学报
廣東工業大學學報
엄동공업대학학보
Journal of Guangdong University of Technology
2015年
3期
85-90
,共6页
信号采集%微分阈值%血氧含量%交直流分离电路
信號採集%微分閾值%血氧含量%交直流分離電路
신호채집%미분역치%혈양함량%교직류분리전로
signal acquisition%differential threshold%oxygen content%AC-DC separation circuit
针对血氧仪系统对血氧参量要求精确度高、抗干扰能力强和功耗低的设计要求,本文的信号放大设计部分采用了差分运放放大电路,提高了信号的信噪比,增大信号的共模抑制比。针对测量环境光的干扰,设计了一组交直流分离电路,可有效地硬件分隔红光和红外光,消除环境光的干扰,提高了系统的工作能力;同时采用微分阈值对血氧参量进行处理,使系统的信号实用性大大提高。整体设计方案的电路设计和实际测试结果证明了该方案的可行性和可靠性。
針對血氧儀繫統對血氧參量要求精確度高、抗榦擾能力彊和功耗低的設計要求,本文的信號放大設計部分採用瞭差分運放放大電路,提高瞭信號的信譟比,增大信號的共模抑製比。針對測量環境光的榦擾,設計瞭一組交直流分離電路,可有效地硬件分隔紅光和紅外光,消除環境光的榦擾,提高瞭繫統的工作能力;同時採用微分閾值對血氧參量進行處理,使繫統的信號實用性大大提高。整體設計方案的電路設計和實際測試結果證明瞭該方案的可行性和可靠性。
침대혈양의계통대혈양삼량요구정학도고、항간우능력강화공모저적설계요구,본문적신호방대설계부분채용료차분운방방대전로,제고료신호적신조비,증대신호적공모억제비。침대측량배경광적간우,설계료일조교직류분리전로,가유효지경건분격홍광화홍외광,소제배경광적간우,제고료계통적공작능력;동시채용미분역치대혈양삼량진행처리,사계통적신호실용성대대제고。정체설계방안적전로설계화실제측시결과증명료해방안적가행성화가고성。
For the requirements for accuracy, anti-interference and power saving of oxygen system param-eters by oximeter, this paper proposes a signal amplification design by using a differential op amp ampli-fier circuit to enhance the signal to noise ratio and increase signal common mode rejection ratio.And be-cause of the measurement of ambient light interference, a set of AC-DC flow separation circuit is also de-signed which can effectively separate hardware red and infrared light, eliminate the interference of ambi-ent light and improve the working capacity of the system.Meanwhile using differential threshold amount to process oxygen parameters can improve the signal system greatly.Hence the circuit simulation and test results demonstrate the feasibility and reliability of the whole design.