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    METHOD AND APPARATUS FOR MAKING ABSOLUTE RANGE MEASUREMENTS
    1.
    发明公开
    METHOD AND APPARATUS FOR MAKING ABSOLUTE RANGE MEASUREMENTS 审中-公开
    绝对距离测量的设备和方法（菲涅耳衍射）

    公开(公告)号：EP1053448A1

    公开(公告)日：2000-11-22

    申请号：EP99905436.4

    申请日：1999-01-14

    申请人： THE UNIVERSITY OF TENNESSEE RESEARCH CORPORATION ,  Lockheed Martin Energy Research Corporation

    发明人： SANDERS, Alvin, J. ,  EARL, Dennis, D. ,  ALLISON, Stephen, W. ,  CATES, Michael, R. ,  KEY, William, S.

    IPC分类号： G01B11/14 ,  G01B9/02

    CPC分类号： G01S17/32 ,  G01B11/026

    摘要： The invention relates to a method and apparatus for making absolute distance or ranging measurements using Fresnel diffraction. The invention employs a source of electromagnetic radiation having a known wavelength or wavelength distribution, which sends a beam of electromagnetic radiation through an object which causes it to be split (hereinafter referred to as a 'beamsplitter') (22), and then to a target (18). The beam is reflected from the target onto a screen containing an aperture spaced a known distance from the beamsplitter (22). The aperture is sized so as to produce a Fresnel diffraction pattern. A portion of the beam travels through the aperture to a detector, spaced a known distance from the screen. The detector defects the central intensity of the beam. The distance from the object which causes the beam to be split to the target can then be calculated based upon the known wavelength, aperture radius, beam intensity, and distance from the detector to the screen (26). Several apparatus embodiments are disclosed for practicing the method embodiments of the present invention.