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    Method and apparatus for comparing two objects having similar shapes and dimensions
    79.
    发明授权
    Method and apparatus for comparing two objects having similar shapes and dimensions 失效
    用于比较具有相似形状和尺寸的两个物体的方法和装置

    公开(公告)号：US3879133A

    公开(公告)日：1975-04-22

    申请号：US42643673

    申请日：1973-12-20

    Applicant: CEM COMP ELECTRO MEC

    Inventor： MATHIEU ERNST

    IPC: G01B11/03 ,  G02B27/60 ,  G01B11/24

    CPC classification number: G02B27/60

    Abstract: A method and apparatus for comparing two objects having similar shapes and dimensions wherein one of the objects is illuminated by a collimated light beam whose intensity is modulated in a direction transverse thereto at a spatial frequency 1/p. The modulated light beam generates a lattice of alternately dark and light parallel bands similar to interference fringes having a pitch p on the illuminated surface of the object having a configuration in the manner of contour lines determined by the relief of the illuminated side of the object. The other object is thereafter substituted for the first one and in the same position, and is similarly illuminated by the same beam but wherein the intensity modulation has been phase-shifted by 180*. The respective images of the two objects are optically superimposed and from which is then obtained only the differential component of the image which is modulated with a spatial frequency 1/p. Apparatus for carrying out the method can be either (1) photographic in which case the superimposed images of the two objects are established by development on a photo-sensitive negative which is light-transmissive in conjunction with a lens which transmits only the differential component in the negative to a photographic plate, or (2) electronically by means of a TV camera and related components by which the respective video images are added and passed to a visual display device such as a cathode ray tube via a filter having a pass band transmitting only the differential signal component which is modulated by the time frequency v/p wherein v constitutes the linear sweep speed of the TV camera.

    Abstract translation: 一种用于比较具有相似形状和尺寸的两个物体的方法和装置，其中一个物体由其空间频率为1 / p的横向于其强度的准直光束照射。 调制光束产生交替的暗和光平行带的格子，其类似于在物体的被照射表面上具有间距p的干涉条纹，其具有由物体的被照射侧的浮雕确定的轮廓线的构造。 此后另一个物体被替换为第一个并处于相同的位置，并且被相同的光束类似地照射，但其中强度调制已被相移180°。 两个物体的相应图像被光学叠加，然后仅从空间频率1 / p调制的图像的差分分量获得。

    Centrifugal, multieffect distillation apparatus
    80.
    发明授权
    Centrifugal, multieffect distillation apparatus 失效
    离心机，多功能蒸馏装置

    公开(公告)号：US3619379A

    公开(公告)日：1971-11-09

    申请号：US3619379D

    申请日：1969-02-25

    Applicant: CEM COMP ELECTRO MEC

    Inventor： BIDARD RENE

    IPC: B01D3/06 ,  C02F1/06

    CPC classification number: C02F1/06 ,  B01D3/06 ,  Y02A20/128

    Abstract: Device for distillation of a liquid, particularly sea water, comprises a plurality of stages each of which includes at least one cell through which the liquid flows and in which steam produced by evaporation is separated from the unevaporated liquid in order to obtain a condensate. The device employs one or more expansion nozzles in each cell through which the liquid expands and is thus converted partly into its vapor phase as a result of the reduction in pressure. The composite liquid and gaseous fluid passes along a curved flow surface which, as a result of the centrifugal forces created effects separation of the liquid from the steam. The steam is then condensed and the remaining liquid passes through a heat exchanger and is then recycled.

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