公开(公告)号：US3741664A

公开(公告)日：1973-06-26

申请号：US3741664D

申请日：1971-05-28

Applicant: SAAB SCANIA AB

Inventor： TORIN J

IPC: G01N21/27 ,  G01N21/20

CPC classification number: G01N21/27

Abstract: Clock pulses are generated at a rate synchronized to scanning of a substance with a light beam. The light is energized in pulses having uniform duration in terms of clock pulses. Output of a photocell responding to incident light is integrated to produce a reference signal of linearly varying magnitude. Magnitude of output of a photocell receiving light passed through the substance is compared with the reference signal, and a difference signal is produced whenever the difference between compared signals has a predetermined sign. During a predetermined uniform portion of every light pulse, clock pulses are counted so long as the difference signal persists, giving a digitized measure of substance transparency/opacity.

Abstract translation: 以与光束的物质的扫描同步的速率产生时钟脉冲。 在具有时钟脉冲的均匀持续时间的脉冲中激发光。 对入射光响应的光电管的输出被积分，以产生线性变化幅度的参考信号。 将通过物质的光电管接收光的输出的大小与参考信号进行比较，并且每当比较的信号之间的差具有预定符号时产生差分信号。 在每个光脉冲的预定均匀部分期间，只要差信号持续，就对时钟脉冲进行计数，给出物质透明度/不透明度的数字化度量。