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Applied Optics

Applied 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)

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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

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

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)

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  1. C. J. Karlsson, F. Å. A. Olsson, D. Letalick, and M. Harris, "All-fiber multifunction continuous-wave coherent laser radar at 1.55 μm for range, speed, vibration, and wind measurements," Appl. Opt. 39, 3716-3726 (2000). [CrossRef]
  2. A. L. Kachelmyer and K. I. Schultz, "Laser vibration sensing," Lincoln Lab. J. 8, 3-28 (1995).
  3. C. A. Hill, M. Harris, K. D. Ridley, E. Jakeman, and P. Lutzmann, "Lidar frequency modulation vibrometry in the presence of speckle," Appl. Opt. 42, 1091-1100 (2003). [CrossRef] [PubMed]
  4. K. D. Ridley and E. Jakeman, "Signal-to-noise analysis of FM demodulation in the presence of multiplicative and additive noise," Signal Process. 80, 1895-1907 (2000). [CrossRef]
  5. S. M. Hannon, J. A. L. Thomson, S. W. Henderson, P. Gatt, R. Stoneman, and D. Bruns, "Agile multiple pulse coherent lidar for range and micro-Doppler measurement," Proc. SPIE 3380, 259-269 (1998). [CrossRef]
  6. R. Foord, R. Jones, J. M. Vaughan, and D. V. Willetts, "Precise comparison of experimental and theoretical SNRs in CO2 laser heterodyne systems," Appl. Opt. 22, 3787-3795 (1983). We conventionally say "ratio" instead of "quotient," not distinguishing between C:N and C/N. [CrossRef] [PubMed]
  7. P. F. Panter, Modulation, Noise, and Spectral Analysis (McGraw-Hill, 1965), Chap. 14.
  8. C. A. Hill, M. Harris, K. D. Ridley, J.-P. Cariou, and V. Jolivet, "Un lidar vibromètre à 1.5 μm en modes impulsionnel et cw," presented at OPTRO 2005, Paris, France, May 2005.
  9. R. J. A. Tough, D. Blacknell, and S. Quegan, "A statistical description of polarimetric and interferometric synthetic aperture radar data," Proc. R. Soc. London Ser. A 449, 567-589 (1995). [CrossRef]
  10. K. Miller and M. Rochwarger, "A covariance approach to spectral moment estimation," IEEE Trans. Inf. Theory 18, 588-596 (1972). [CrossRef]
  11. G. W. Lank, I. S. Reed, and G. E. Pollon, "A semicoherent detection and Doppler estimation statistic," IEEE Trans. Aerosp. Electron. Syst. 9, 151-165 (1973). [CrossRef]
  12. M. Ghogho, A. Swami, and T. S. Durrani, "Frequency estimation in the presence of Doppler spread: performance analysis," IEEE Trans. Signal Process. 49, 777-789 (2001). [CrossRef]
  13. B. J. Rye and R. M. Hardesty, "Discrete spectral peak estimation in incoherent backscatter heterodyne lidar, I: Spectral accumulation and the Cramer-Rao lower bound," IEEE Trans. Geosci. Remote Sens. 31, 16-27 (1993). [CrossRef]
  14. B. J. Rye and R. M. Hardesty, "Discrete spectral peak estimation in incoherent backscatter heterodyne lidar, II: Correlogram accumulation," IEEE Trans. Geosci. Remote Sens. 31, 28-35 (1993). [CrossRef]
  15. D. C. Rife and R. R. Boorstyn, "Single tone parameter estimation from discrete-time observations," IEEE Trans. Inf. Theory 20, 591-598 (1974). [CrossRef]
  16. D. G. Youmans, "Spectral estimation of Doppler spread vibrating targets using coherent ladar," Proc. SPIE 5412, 229-240 (2004). [CrossRef]

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