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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 20 — Jul. 10, 2007
  • pp: 4376–4385

Fiber-based 1.5 μm lidar vibrometer in pulsed and continuous modes

Christopher A. Hill, Michael Harris, and Kevin D. Ridley  »View Author Affiliations


Applied Optics, Vol. 46, Issue 20, pp. 4376-4385 (2007)
http://dx.doi.org/10.1364/AO.46.004376


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Abstract

A fiber-based 1.5 μ m heterodyne lidar that is easily switched between pulse-pair and cw modes is described. In laboratory experiments using well-controlled vibrating targets, and in computer simulations, the performance of the two modes is compared given the same average laser power. The accuracy of Doppler frequency (target velocity) estimates, and the signal-to-noise ratio in spectrally resolved plots of vibrational features, are evaluated. When the target-induced frequency modulation is wideband, pulse-pair often has clearly higher carrier-to-noise. But its advantage in signal-to-noise is smaller because combining the more numerous cw measurements improves the estimates of vibration frequencies and amplitudes. They are combined here through autocorrelation-based demodulation, one of several methods that can outperform phase-differencing.

© 2007 Optical Society of America

OCIS Codes
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(280.3420) Remote sensing and sensors : Laser sensors

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: October 10, 2006
Revised Manuscript: January 31, 2007
Manuscript Accepted: March 5, 2007
Published: June 20, 2007

Citation
Christopher A. Hill, Michael Harris, and Kevin D. Ridley, "Fiber-based 1.5 μm lidar vibrometer in pulsed and continuous modes," Appl. Opt. 46, 4376-4385 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-20-4376

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