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1. 发明专利

DE1498180A1 未知
公开(公告)号：DE1498180A1
公开(公告)日：1969-02-06
申请号：DE1498180
申请日：1965-10-26
申请人： FORTIER ANDRE , PEUBE JEAN LAURENT
发明人： FORTIER ANDRE , LAURENT PEUBE JEAN
IPC分类号： G01F23/00 , G01F23/292 , G01L7/18 , G01B9/02
摘要： 1,111,859. Measuring optically. A. FORTIER and J. L. PEUPE. Oct. 15, 1965 [Oct. 29, 1964], No. 43889/65. Heading G1M. [Also in Division G2] Apparatus for gauging the position of a movable object, for example a liquid level in a transparent tube, comprises means for projecting light on to a reflective curved surface movable bodily with the object, whereby the reflected light will envelop a caustic and form interference fringes adjacent said caustic, and a magnifying optical viewer for observing a selected one of said fringes. As shown, the viewer 7 and a light-source 15 are fixed on a rigid frame 16 which is displaceable parallel to a tube 2 containing a liquid 1, the level of which is under observation. Reflection of light from the source 18 at the curved meniscus 5 of the liquid sets up interference fringes which are observed through the viewer. A reticle wire in the viewer is brought into coincidence with a selected fringe by moving the viewer parallel to the tube 2. A comparator 11 supported on a fixed structure 3 which also mounts the tube 2 is coupled to the viewer 7 and adjusted to zero. Any subsequent variation in the liquid is recorded on the comparator 11 by moving the viewer until the same fringe coincides with the reticle wire. When an opaque liquid is under investigation the light-source 18 is arranged above the meniscus 5. In a further embodiment the light-source may be fixedly aligned with the tube 2 so that light strikes the meniscus in the same way regardless of the liquid level. In applying the apparatus to the measuring of displacement of a solid object a light weight element having a curved reflective surface, e. g. a glass rod, is attached to the object if such a surface is not provided by the object itself.

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