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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 6 — Feb. 20, 2003
  • pp: 1091–1100

Lidar Frequency Modulation Vibrometry in the Presence of Speckle

Christopher A. Hill, Michael Harris, Kevin D. Ridley, Eric Jakeman, and Peter Lutzmann  »View Author Affiliations


Applied Optics, Vol. 42, Issue 6, pp. 1091-1100 (2003)
http://dx.doi.org/10.1364/AO.42.001091


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Abstract

We report laboratory target vibration measurements that use an easily aligned and adjusted fiber-based 1.5-μm heterodyne lidar. The targets are simple spherically curved retroreflectors with well-controlled vibration frequencies and amplitudes. A rotating ground-glass screen creates Gaussian speckle. We wish to understand the modulated and fast-fading lidar returns seen from real targets. We frequency demodulated the recorded laboratory data by phase differencing to provide estimates of dφ/dt, where φ is the phase of the received carrier-plus-noise phasor. Experimental results for signal strength and signal-to-noise ratio, for specific target modulation parameters, agree well with our recently developed dφ/dt correlation-function theory.

© 2003 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

Citation
Christopher A. Hill, Michael Harris, Kevin D. Ridley, Eric Jakeman, and Peter Lutzmann, "Lidar Frequency Modulation Vibrometry in the Presence of Speckle," Appl. Opt. 42, 1091-1100 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-6-1091

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