Two-point diffraction interferometer for absolute distance measurement

Seung-Woo Kim; Hyug-Gyo Rhee; Jiyoung Joo; Young Jin Kim

doi:10.1117/12.558834

2 August 2004 Two-point diffraction interferometer for absolute distance measurement

Seung-Woo Kim, Hyug-Gyo Rhee, Jiyoung Joo, Young Jin Kim

Proceedings Volume 5531, Interferometry XII: Techniques and Analysis; (2004) https://doi.org/10.1117/12.558834
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

We describe a novel method of measuring absolute distances by using a two-point diffraction source specially devised to generate two high quality spherical waves simultaneously with a small lateral offset. Interference of the generated two spherical waves produces a unique ellipsoidal phase distribution in the measurement space. A partial map of the resulted interference phase field is sampled and fitted to a geometric model of multilateration that allows absolute-distance measurements to be performed without 2π-ambiguity. The partial phase map may be obtained by use of either homodyne or heterodyne phase measuring technique. Test results demonstrate that high precision with 1 part in 10⁶ uncertainty can be achieved over 1 meter distance range.

Citation Download Citation

Seung-Woo Kim, Hyug-Gyo Rhee, Jiyoung Joo, and Young Jin Kim "Two-point diffraction interferometer for absolute distance measurement", Proc. SPIE 5531, Interferometry XII: Techniques and Analysis, (2 August 2004); https://doi.org/10.1117/12.558834

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