公开(公告)号：US3711208A

公开(公告)日：1973-01-16

申请号：US3711208D

申请日：1971-03-30

Applicant: CIBA GEIGY AG

Inventor： ABBONDIO A

IPC: G01J1/16 ,  G01J1/24 ,  G01N21/06 ,  G01N21/22

CPC classification number: G01J1/16 ,  G01J1/24

Abstract: The invention relates to a densitometer in which the slope of the density curve is adjustable. The densitometer provides a rotatable grey wedge disc and a rotatable chopper disc disposed so that a measuring light beam can pass through both discs and an object to be subjected to measurement and a reference light beam can pass only through the chopper disc. Both beams then image on a photoelectric detector which feeds corresponding signals to a comparator. When a starting position on the rotatable grey wedge disc passes a predetermined point, a circuit is opened which permits the comparator to connect a counter to a counting pulse transmitter, provided also that a predetermined relationship, for example equality, exists between said signals. The pulse repetition rate of the counting pulse transmitter is preferably controlled in dependence upon the rotational speed of the chopper disc and the slope of the density curve can be varied by adjusting the ratio between the rotational speed of the grey wedge disc and the pulse repetition rate. Where the pulse repetition rate is dependent upon the speed of the chopper disc, this adjustment is effected by a variable speed gear between the discs.

Abstract translation: 本发明涉及密度曲线的斜率可调的密度计。 密度计提供可旋转的灰楔形盘和可旋转的斩光盘，其设置成使得测量光束可以通过两个盘和待测量的物体，并且参考光束可以仅通过斩波盘。 然后两个光束在光电检测器上成像，该光电检测器将相应的信号馈送到比较器。 当可旋转灰楔形盘上的起始位置通过预定点时，打开电路，其允许比较器将计数器连接到计数脉冲发射器，只要在所述信号之间存在预定的关系，例如相等性。 计数脉冲发送器的脉冲重复率优选根据斩波盘的旋转速度进行控制，密度曲线的斜率可以通过调整灰楔形盘的转速与脉冲重复率之比 。 在脉冲重复率取决于斩波盘的速度的情况下，这种调节由盘之间的可变速度齿轮来实现。