公开(公告)号：US3737617A

公开(公告)日：1973-06-05

申请号：US3737617D

申请日：1971-05-10

Applicant: SOPELEM

Inventor： LLOP H ,  LEFORT P

IPC: H01J37/22 ,  H01J37/26

CPC classification number: H01J37/224

Abstract: Apparatus for indicating and/or controlling the exposure time of photographic material exposed to the electron beam of an electron microscope includes an electron impermeable, insulated conductive screen which may be positioned to intercept a part at least of the electron beam. The current flowing to the screen may be measured to indicate required exposure time. Alternatively the voltage across a resistor in the current path may be stored and integrated to yield a signal for indicating that exposure should be terminated. The signal may be used to produce termination of exposure.

Abstract translation: 用于指示和/或控制暴露于电子显微镜的电子束的照相材料的曝光时间的装置包括电子不可渗透的绝缘导电屏，其可被定位成截取至少电子束的一部分。 可以测量流向屏幕的电流，以指示所需的曝光时间。 或者，电流路径中的电阻器两端的电压可以被存储和积分，以产生用于指示曝光应终止的信号。 该信号可用于产生曝光终止。

公开(公告)号：US3751168A

公开(公告)日：1973-08-07

申请号：US3751168D

申请日：1971-05-11

Applicant: SOPELEM

Inventor： LLOP H ,  LEFORT P

IPC: G01N21/43 ,  G01N21/46 ,  G05B1/00

CPC classification number: G01N21/43

Abstract: There is described an apparatus for producing an electrical signal related to the varying concentration of a solution, for example a sugar solution. Light is inclinedly directed upon a surface of a prism which is in contact with the solution, so that light falling on one side of a boundary line, the position of which is a function of the concentration of the solution, is transmitted into the solution while light falling on the other side of this boundary line is totally reflected. The reflected light is directed towards an assembly including two photocells which are spaced apart in the direction of movement of the boundary as the solution concentration varies. The outputs of the two photocells are combined in a difference amplifier to yield a signal denoting that the solution concentration has reached a predetermined value dependent upon the position in said direction of movement to which the assembly is adjusted.

Abstract translation: 描述了一种用于产生与溶液变化浓度有关的电信号的装置，例如糖溶液。 光倾斜地指向与溶液接触的棱镜的表面，使得其位置与溶液浓度有关的边界线的一侧的光被传输到溶液中， 落在该边界线另一边的光被完全反射。 反射光指向包括两个光电池的组件，该光电池当溶液浓度变化时沿着边界的移动方向间隔开。 两个光电管的输出被组合在差分放大器中以产生表示溶液浓度已经达到预定值的信号，这取决于所述组件被调节到的所述移动方向上的位置。