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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 21 — Jul. 20, 2002
  • pp: 4314–4317

Automatic alignment of a displacement-measuring heterodyne interferometer

Jennifer E. Logan, Peter G. Halverson, Martin W. Regehr, and Robert E. Spero  »View Author Affiliations


Applied Optics, Vol. 41, Issue 21, pp. 4314-4317 (2002)
http://dx.doi.org/10.1364/AO.41.004314


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Abstract

A technique to align automatically the beams of displacement-measuring interferometric gauges is described. The pointing of the launched beam is modulated in a circular pattern, and the resulting displacement signal is demodulated synchronously to determine the alignment error. This error signal is used in a control system that maintains the alignment for maximum path between a pair of fiducial hollow-cube corner retroreflectors, which minimizes sensitivity to alignment drift. The technique is tested on a developmental gauge of the type intended for the Space Interferometry Mission. The displacement signal for the gauge is generated in digital form; and the lock-in amplifier functions of modulation, demodulation, and filtering are all implemented digitally.

© 2002 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology
(220.1140) Optical design and fabrication : Alignment

History
Original Manuscript: October 4, 2001
Revised Manuscript: April 19, 2002
Published: July 20, 2002

Citation
Jennifer E. Logan, Peter G. Halverson, Martin W. Regehr, and Robert E. Spero, "Automatic alignment of a displacement-measuring heterodyne interferometer," Appl. Opt. 41, 4314-4317 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-21-4314

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