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    • 5. 发明申请
    • Liquid chromatographic method and system
    • 液相色谱法和体系
    • US20070089493A1
    • 2007-04-26
    • US11605980
    • 2006-11-29
    • Robert AllingtonDale DavisonScott Blakley
    • Robert AllingtonDale DavisonScott Blakley
    • G01N30/00
    • G01N30/466B01D15/12B01D15/166B01D15/247G01N1/14G01N1/38G01N30/22G01N30/24G01N30/32G01N30/34G01N30/74G01N30/88G01N35/1095G01N35/1097G01N2001/383G01N2030/027G01N2030/324G01N2030/326G01N2030/347
    • A chromatographic monitor includes an array of flow cells with individual light sensors that are collectively an array of photodiodes. The output from the photodiodes are multiplexed. To prevent losing information, the photodiodes are each connected to a different one of a plurality of inputs to the multiplexer through a corresponding one of a plurality of circuits that stores energy during the time the one inlet is not connected through the multiplexer to the signal processing circuitry that forms a part of an absorbance monitor. Preferably, the energy storing circuit is a non-switching circuit with low bandwidth and a flat-topped response to an impulse. This improves the signal to noise ratio. A one pole low pass filter with a (1-1/e) Dirac pulse fall time and equal to the multiplex entire cycle repeat time can perform this function and a one pole low pass filter provides satisfactory results. Still better results can be obtained from a three pole, one or two percent overshoot filter with combined minimum frequency bandwidth and fast rise time. A rise time equal to ½ the multiplex entire cycle.
    • 色谱监测器包括具有单独的光传感器的流动池阵列,它们共同地是一组光电二极管。 来自光电二极管的输出被复用。 为了防止丢失信息,光电二极管各自通过多个电路中的相应一个电路将多个输入中的不同的一个输入连接到多个电路,多个电路在一个入口未通过多路复用器连接到信号处理期间存储能量 形成吸光度监测器的一部分的电路。 优选地,能量存储电路是具有低带宽和对脉冲的平顶响应的非开关电路。 这提高了信噪比。 具有(1-1 / e)狄拉克脉冲下降时间并且等于多路复用全周期重复时间的单极低通滤波器可以执行该功能,并且单极低通滤波器提供令人满意的结果。 可以从具有组合的最小频率带宽和快速上升时间的三极,一或二%过冲滤波器获得更好的结果。 上升时间等于多路复用整个周期的1/2。