Absolute distance measurements using point-diffracted spherical waves

Jiyoung Chu; Seung-Woo Kim

doi:10.1117/12.678690

14 August 2006 Absolute distance measurements using point-diffracted spherical waves

Jiyoung Chu, Seung-Woo Kim

Proceedings Volume 6293, Interferometry XIII: Applications; 62930P (2006) https://doi.org/10.1117/12.678690
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

We describe a novel interferometric scheme that attempts to measure the absolute distance of a three-dimensionally moving target with respect to a reference station. The target transmits two orthogonal pairs of lateral-shearing interferograms generated using four near-perfect spherical waves emitted from single-mode fibers by means of point diffraction. The interferograms are modulated with varying amounts of phase shifting and monitored by the reference station holding a 2-D array of photodetectors. Captured interferograms are analyzed by use of a modified version of the Rimmer-Wyant technique and reconstructed as the spherical wavefront emitted form the center of four fibers in the target. The absolute distance of the target is then determined by fitting the reconstructed wavefront into Zernike polynomials. Experimental results are discussed to verify that the proposed method is capable of measuring the absolute distance along not only the optical axis, but also out of the axis.

Citation Download Citation

Jiyoung Chu and Seung-Woo Kim "Absolute distance measurements using point-diffracted spherical waves", Proc. SPIE 6293, Interferometry XIII: Applications, 62930P (14 August 2006); https://doi.org/10.1117/12.678690

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