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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 29 — Oct. 10, 2011
  • pp: 5735–5749

Experimental investigations of the scanning functions of galvanometer-based scanners with applications in OCT

Virgil-Florin Duma, Kye-sung Lee, Panomsak Meemon, and Jannick P. Rolland  »View Author Affiliations

Applied Optics, Vol. 50, Issue 29, pp. 5735-5749 (2011)

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We analyze the three most common profiles of scanning functions for galvanometer-based scanners (GSs): the sawtooth, triangular and sinusoidal functions. They are determined experimentally with regard to the scan parameters of the input signal (i.e., frequency and amplitude). We study the differences of the output function of the GS measured as the positional error of the oscillatory mirror from the ideal function given by the input signal of the device. The limits in achieving the different types of scanning functions in terms of duty cycle and linearity are determined experimentally for the possible range of scan parameters. Of particular importance are the preservation of an imposed duty cycle and profile for the sawtooth function, the quantification of the linearity for the sinusoidal function, and the effective duty cycle for the triangular, as well as for the other functions. The range of scan amplitudes for which the stability of the oscillatory regime of the galvo mirror is stable for different frequencies is also highlighted. While the use of the device in certain scanning regimes is studied, certain rules of thumb are deduced to make the best out of the galvoscanner. Finally, the three types of scanning functions are tested with a Fourier domain optical coherence tomography (FD OCT) setup and the conclusions of the study are demonstrated in an imaging application by correlating the determined limits of the scanning regimes with the requirements of OCT.

© 2011 Optical Society of America

OCIS Codes
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.5800) Instrumentation, measurement, and metrology : Scanners
(170.4500) Medical optics and biotechnology : Optical coherence tomography
(220.4880) Optical design and fabrication : Optomechanics
(230.4040) Optical devices : Mirrors

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: April 13, 2011
Revised Manuscript: July 5, 2011
Manuscript Accepted: July 7, 2011
Published: October 7, 2011

Virtual Issues
Vol. 6, Iss. 11 Virtual Journal for Biomedical Optics

Virgil-Florin Duma, Kye-sung Lee, Panomsak Meemon, and Jannick P. Rolland, "Experimental investigations of the scanning functions of galvanometer-based scanners with applications in OCT," Appl. Opt. 50, 5735-5749 (2011)

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