30 May 2003 Novel interferometer for three-dimensional coordinate measurement of freely moving objects
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We proposed a novel interferometer, which can measure the 3-dimensional coordinates of freely moving objects in space. The interferometer is composed of two fiber ends and three photo detectors. Frequency stabilized laser is incident into an optical fiber, and then split by the fiber beam splitter into two fiber ends. One fiber is used as the fixed reference arm, and the other as the movable test arm of the interferometer. By using servo control on one arm, the phase difference of the laser beams being emitted from the two fiber ends is forced to be kept constant. Beams from each fiber end are combined at the photo detectors on which interference fringes are formed. The displacement of the distances of the moving fiber end (MFE) from the three detectors can be measured by analyzing the interference fringe. From the measured distances of the MFE from each detector, the 3-dimensional coordinates of the MFE are obtained in real time by using the triangulation. Since the wavefront of the beam from the MFE is spherical, the displacement of the MFE is not restricted to a specific direction, which requires no guiding rail for the moving object. This interferometer could be applied to situations where 3-dimensional coordinates of freely moving objects are being measured with high precision.
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Jae Wan Kim, Jae Wan Kim, Chu-Shik Kang, Chu-Shik Kang, Tae Bong Eom, Tae Bong Eom, } "Novel interferometer for three-dimensional coordinate measurement of freely moving objects", Proc. SPIE 5144, Optical Measurement Systems for Industrial Inspection III, (30 May 2003); doi: 10.1117/12.500417; https://doi.org/10.1117/12.500417


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