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    • 6. 发明公开
    • Optical warm stop with fresnel type reflective surface
    • 光热屏蔽用fresnelartiger反射表面
    • EP0697584A3
    • 1998-04-08
    • EP95305500.1
    • 1995-08-07
    • Hughes Aircraft Company
    • Hanke, Dietmar
    • G01J5/08G01J5/06
    • G01J5/08G01J5/047G01J5/06G01J5/0806G01J5/0809G01J5/0856
    • An infrared imaging system (10) has a detector assembly (12) positioned for viewing infrared radiation from a subject (20), and a housing (18) enclosing the detector assembly for maintaining the detector assembly at a temperature lower than a temperature of an environment outside the housing, the housing having a window (42) for transmission of radiation from the subject to the detector assembly. A cold stop (46) is located within the housing and a warm stop (48) is located outside the housing for transmitting radiation via their respective apertures (50, 52) from the subject to the detector assembly. The warm stop has a planar retroreflective surface (62) for reflecting rays from the detector assembly back to the detector assembly, thereby to minimize thermal noise. The retroreflective surface is profiled with grooves (66) arranged in a configuration for directing the rays of radiation back to the detector assembly, the configuration of grooves being a Fresnel configuration (62) or a kinoform configuration (62A) or a binary configuration (62B). Any desired location of the warm stop may be employed, even within a lens assembly (26), and any desired configuration of the shape of the aperture may be employed such as a rectangular or square shaped aperture.
    • 7. 发明公开
    • Optical warm stop with fresnel type reflective surface
    • OptischesWärmeschildmit fresnelartiger reflektierenderOberfläche
    • EP0697584A2
    • 1996-02-21
    • EP95305500.1
    • 1995-08-07
    • Hughes Aircraft Company
    • Hanke, Dietmar
    • G01J5/08G01J5/06
    • G01J5/08G01J5/047G01J5/06G01J5/0806G01J5/0809G01J5/0856
    • An infrared imaging system (10) has a detector assembly (12) positioned for viewing infrared radiation from a subject (20), and a housing (18) enclosing the detector assembly for maintaining the detector assembly at a temperature lower than a temperature of an environment outside the housing, the housing having a window (42) for transmission of radiation from the subject to the detector assembly. A cold stop (46) is located within the housing and a warm stop (48) is located outside the housing for transmitting radiation via their respective apertures (50, 52) from the subject to the detector assembly. The warm stop has a planar retroreflective surface (62) for reflecting rays from the detector assembly back to the detector assembly, thereby to minimize thermal noise. The retroreflective surface is profiled with grooves (66) arranged in a configuration for directing the rays of radiation back to the detector assembly, the configuration of grooves being a Fresnel configuration (62) or a kinoform configuration (62A) or a binary configuration (62B). Any desired location of the warm stop may be employed, even within a lens assembly (26), and any desired configuration of the shape of the aperture may be employed such as a rectangular or square shaped aperture.
    • 该系统包括被定位用于观看被摄体的检测器组件,并且光学系统包括具有用于将来自检测器组件的光线反射回检测器组件的反射反射表面的停止件。 该止动件具有用于将来自受试者的辐射光线传输到检测器组件的孔。 逆反射表面具有凹槽,凹槽布置成将辐射射线引导回到检测器组件。 反射反射表面是平面的,并且凹槽为反射表面提供菲涅尔结构,并且凹槽为反射表面提供kino形式配置。