CAJ | 학술논문

基于近红外（near-infrared， NIR）光谱，提出一种血液酒精的检测方法，并设计一种低噪声、低漂移、高精度的前置预放大电路，该电路用于准确检测血液中酒精的体积分数。在本设计电路中的电流电压转化部分，选择使用2种电路对比的方法，通过 Multisim 电路仿真软件模拟来比较电路的漂移和误差，同时利用 Matlab 进行数据处理；预放大电路部分利用高共模抑制比的 AD620设计了差分放大电路，来提高电路的共模抑制比（common mode rejection ratio，CMRR）。结果表明，使用对称补偿型低温漂电流电压变换电路，能够很好的抑制漂移降低误差，与常用的 OP07电流电压转换电路相比，可降低误差约2％，可降低漂移约97％，为微弱信号的处理提供了依据。
기우근홍외（near-infrared， NIR）광보，제출일충혈액주정적검측방법，병설계일충저조성、저표이、고정도적전치예방대전로，해전로용우준학검측혈액중주정적체적분수。재본설계전로중적전류전압전화부분，선택사용2충전로대비적방법，통과 Multisim 전로방진연건모의래비교전로적표이화오차，동시이용 Matlab 진행수거처리；예방대전로부분이용고공모억제비적 AD620설계료차분방대전로，래제고전로적공모억제비（common mode rejection ratio，CMRR）。결과표명，사용대칭보상형저온표전류전압변환전로，능구흔호적억제표이강저오차，여상용적 OP07전류전압전환전로상비，가강저오차약2％，가강저표이약97％，위미약신호적처리제공료의거。
A blood alcohol detection method was investigated based on NIR(near-infrared) spectroscopy.And a low-noise, low-drift and high-precision preamplifier was designed to detect the blood alcohol volume fraction accurately.In the current-voltage conversion section, the simulation of drift and error of two kinds of circuits were carried out by Mul-tisim software.AD620 was selected in the preamplifier part which could improve the CMRR(common mode rejection ratio) of circuits.The results of simulation showed that the current-voltage conversion circuit of symmetrical compensa-tional low-temperature drift can suppressed the drift and reduced error better.Compared with the OP07 current-voltage conversion circuit, the error could be reduced by 2%, while the draft could be reduced by 97%, which could support weak signal analyzing.