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Applied Optics

Applied 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)

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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

Original Manuscript: May 7, 2002
Revised Manuscript: October 21, 2002
Published: February 20, 2003

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)

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