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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 30 — Oct. 20, 2007
  • pp: 7365–7373

Effects of spatial modes on ladar vibration signature estimation

Douglas Jameson, Matthew Dierking, and Bradley Duncan  »View Author Affiliations


Applied Optics, Vol. 46, Issue 30, pp. 7365-7373 (2007)
http://dx.doi.org/10.1364/AO.46.007365


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Abstract

Ladar-based vibrometry has been shown to be a powerful technique in enabling the plant identification of machines. Rather than sensing the geometric shape of a target laser vibrometers sense motions of the target induced by moving parts within the system. Since the target need not be spatially resolved, vibration can be sensed reliably and provide positive identification at ranges beyond the imaging limits of the aperture. However, as the range of observation increases, the diffraction-limited beam size on the target increases as well, and may encompass multiple vibrational modes on the target's surface. As a result, vibration estimates formed from large laser footprints illuminating multiple modes on a vibrating target will experience a degradation. This degradation is manifest as a spatial low-pass filtering effect: high-order mode shapes, associated with high-frequency vibrations, will be averaged out while low-frequency vibrations will be affected less. A model to predict this phenomenology is proposed for both pulse-pair and cw vibrometry systems. The cw model is compared to results obtained using an off-the-shelf laser vibrometry system.

© 2007 Optical Society of America

OCIS Codes
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis
(280.3640) Remote sensing and sensors : Lidar
(280.1350) Remote sensing and sensors : Backscattering

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: June 28, 2007
Revised Manuscript: August 27, 2007
Manuscript Accepted: August 28, 2007
Published: October 10, 2007

Citation
Douglas Jameson, Matthew Dierking, and Bradley Duncan, "Effects of spatial modes on ladar vibration signature estimation," Appl. Opt. 46, 7365-7373 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-30-7365


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References

  1. R. R. Ebert and P. Lutzmann, "Vibration imagery of remote objects," Proc. SPIE 4821, 1-10 (2002). [CrossRef]
  2. N. Pepela, "Effect of multi-mode vibration on signature estimation using a laser vibration sensor," Master's thesis (Air Force Institute of Technology, Wright-Patterson Air Force Base, 2003).
  3. S. W. Henderson and S. M. Hannon, "Advanced coherent lidar system for wind measurements," Proc. SPIE 5887, 58870I (2005).
  4. M. Richards, Fundamentals of Radar Signal Processing (McGraw-Hill, 2005).
  5. B. E. A. Saleh and M. C. Teich, Fundamentals of Photonics (Wiley, 1991).
  6. T. A. Sturm, R. Richmond, and B. D. Duncan, "A technique for removing platform vibration noise from a pulsed ladar vibration sensor," Opt. Laser Technol. 27, 343-350 (1995). [CrossRef]
  7. E. Kreyszig, Advanced Engineering Mathematics, 7th ed. (Wiley, 1993).
  8. Polytec, "Single point vibrometers," http://www.polytec.com/usa/158_421.asp.
  9. F. G. Stremler, Introduction to Communication Systems, 3rd ed. (Addison-Wesley, 1992).
  10. MathWorks, "Signal processing and communications," http://www.mathworks.com/applications/dsp_comm/.
  11. K. Leentvaar and J. H. Flint, "The capture effect in FM receivers," IEEE Trans. Commun. Comm- 24, 531-539 (1976). [CrossRef]
  12. Reflexite, "Products--photoelectric controls," http://www.reflexiteamericas.com/photoelectric.htm.
  13. D. Chambers, "Modeling heterodyne efficiency for coherent laser radar in the presence of aberrations," Opt. Express 1, 60-67 (1997).

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