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Optical Engineering

Accuracy of frequency-sweeping interferometry for absolute distance metrology
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Paper Abstract

Coherent interferometric absolute distance metrology is one of the most interesting techniques for length metrology. Without movement, measurements are made without ambiguity, by using either one or several synthetic wavelengths resulting from the beating of two or more wavelengths (multiple-wavelength interferometry), or a frequency sweep (frequency-sweeping interferometry). Sensors based on the latter are relatively simple devices and can fulfill an important role in dimensional metrology. In addition, their parameterization flexibility allows trade-offs to be performed, either technology-driven or application-related. We present in detail a theoretical model of frequency-sweeping interferometry and its uncertainty budget, discuss different parameterizations, present a method for drift error compensation, and demonstrate and evaluate sensor performance and robustness with a prototype sensor composed of a mode-hop-free frequency-sweep external-cavity diode laser, a high-finesse Fabry-Pérot interferometer (to measure accurately the frequency sweep range), homodyne detection, and data processing. Results have shown that the inaccuracy will not exceed 10 μm for distances up to 1 m, at an affordable degree of complexity.

Paper Details

Date Published: 1 July 2007
PDF: 10 pages
Opt. Eng. 46(7) 073602 doi: 10.1117/1.2754308
Published in: Optical Engineering Volume 46, Issue 7
Show Author Affiliations
Alexandre Pereira Cabral, Instituto Nacional de Engenharia, Tecnologia e Inovação, I.P. (Portugal)
José Manuel Rebordão, Instituto Nacional de Engenharia, Tecnologia e Inovação, I.P. (Portugal)


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