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1. 发明授权

US4246489A Liquid level detector for detecting a liquid level when reaching a prescribed height 失效
标题翻译：液位检测器，用于在达到规定高度时检测液位
公开(公告)号：US4246489A
公开(公告)日：1981-01-20
申请号：US30373
申请日：1979-04-16
申请人： Mitsuo Yoshida , Toshihiko Kihara , Hiroshi Nagasawa
发明人： Mitsuo Yoshida , Toshihiko Kihara , Hiroshi Nagasawa
IPC分类号： G01F23/292 , G01N21/43 , G01N15/06
CPC分类号： G01N21/43 , G01F23/2922 , Y10S250/903
摘要： A liquid level detector for detecting whether a boundary surface between a liquid and a medium rises beyond a prescribed level comprises a rectangular prismatic refractor body formed of a material which only allows the transmission of a light having particular wavelengths and absorbs light having other wavelengths. The refractor body have first and second inclined flat surfaces and a base. The base of the refractor body is provided with a light-emitting element for projecting a beam of light having the particular wavelength and a photoelectric conversion element for converting the light to an electric signal. Each of these element is equidistantly spaced from the center of the base, and the optical axis of each of these elements defines an angle of 45.degree. with each of the inclined surfaces of the refractor body. Where the first inclined surface contacts an medium, the light beam from the light-emitting element passes through the refractor body, is totally reflected from the first and second inclined surfaces, and finally enters the photoelectric conversion element. Where the first inclined surface contacts a liquid, the light beam from the light-emitting element passes through the refractor body, is refracted on the first inclined surface and enters the liquid, and the photoelectric conversion element receives substantially no light and generates no electric signal.
摘要翻译：一种用于检测液体和介质之间的边界面是否超过规定水平的液面检测器包括由仅允许透射具有特定波长的光并吸收具有其它波长的光的材料形成的矩形棱镜折射体。折射体具有第一和第二倾斜平面和基部。折射体的基部设置有用于投射具有特定波长的光束的发光元件和用于将光转换为电信号的光电转换元件。这些元件中的每一个与基座的中心等距离地间隔开，并且这些元件中的每一个的光轴与折射体的每个倾斜表面形成45°的角度。当第一倾斜面接触介质时，来自发光元件的光束穿过折射体，从第一和第二倾斜表面全反射，最后进入光电转换元件。当第一倾斜面接触液体时，来自发光元件的光束穿过折射体，在第一倾斜表面上折射并进入液体，并且光电转换元件基本上不受光并且不产生电信号。

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