公开(公告)号：US3863160A

公开(公告)日：1975-01-28

申请号：US35793073

申请日：1973-05-07

申请人： DOTY EDWARD NEAL

发明人： DOTY EDWARD NEAL

IPC分类号： G01N15/12 ,  H03K5/1532 ,  H03K5/20

CPC分类号： G01N15/1227 ,  H03K5/1532

摘要： The pulses produced by a Coulter type of electronic particle analyzer having a scanning aperture have amplitudes proportional to the particle volumes; hence, random in amplitude. The pulses are variably asymmetric due to the particle scanning aperture and particle flow arrangement. The most reliable measure of particle volume is pulse amplitude at the time when the particle is halfway through the scanning aperture path. By attenuating each pulse to the same predetermined percentage of its amplitude and comparing the attenuated signal level with the original pulse in two different time spaced channels, there results two equal rectangular time-spaced pulses that separately then are integrated and compared. If the integration durations are equal, but one integral signal is attenuated to one half, then the two time-spaced integral signals will have equal amplitudes at the time center of the rectangular pulse, the symmetric time center of the original pulse. Adjustment of the slope of integration and/or attenuation of one integral signal can shift the time position. In this manner the amplitude of the particle-pulse can be strobed at its aperture path center time.

摘要翻译： 由具有扫描孔径的Coulter型电子粒子分析仪产生的脉冲具有与粒子体积成比例的振幅; 因此，幅度随机。 由于颗粒扫描孔径和颗粒流动布置，脉冲是可变的不对称的。 最可靠的粒子体积测量是当粒子在扫描孔径路径的中途时的脉冲幅度。 通过将每个脉冲衰减到相同的预定百分比的幅度并将衰减的信号电平与两个不同时间间隔的通道中的原始脉冲进行比较，产生两个相等的矩形时间间隔脉冲，然后将其进行积分和比较。 如果积分持续时间相等，但是一个积分信号衰减到一半，则两个时间间隔积分信号在矩形脉冲的时间中心处具有相等的幅度，即原始脉冲的对称时间中心。 一个积分信号的积分斜率和/或衰减的调整可以改变时间位置。 以这种方式，粒子脉冲的幅度可以在其孔径中心时间被选通。