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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 15 — May. 20, 2011
  • pp: 2263–2273

Laser vibrometry from a moving ground vehicle

Leaf A. Jiang, Marius A. Albota, Robert W. Haupt, Justin G. Chen, and Richard M. Marino  »View Author Affiliations


Applied Optics, Vol. 50, Issue 15, pp. 2263-2273 (2011)
http://dx.doi.org/10.1364/AO.50.002263


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Abstract

We investigated the fundamental limits to the performance of a laser vibrometer that is mounted on a moving ground vehicle. The noise floor of a moving laser vibrometer consists of speckle noise, shot noise, and platform vibrations. We showed that speckle noise can be reduced by increasing the laser spot size and that the noise floor is dominated by shot noise at high frequencies (typically greater than a few kilohertz for our system). We built a five-channel, vehicle-mounted, 1.55 μm wavelength laser vibrometer to measure its noise floor at 10 m horizontal range while driving on dirt roads. The measured noise floor agreed with our theoretical estimates. We showed that, by subtracting the response of an accelerometer and an optical reference channel, we could reduce the excess noise (in units of micrometers per second per Hz 1 / 2 ) from vehicle vibrations by a factor of up to 33, to obtain nearly speckle-and-shot-noise-limited performance from 0.3 to 47 kHz .

© 2011 Optical Society of America

OCIS Codes
(280.3340) Remote sensing and sensors : Laser Doppler velocimetry
(280.3420) Remote sensing and sensors : Laser sensors
(280.3640) Remote sensing and sensors : Lidar

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: November 19, 2010
Revised Manuscript: February 4, 2011
Manuscript Accepted: February 7, 2011
Published: May 18, 2011

Citation
Leaf A. Jiang, Marius A. Albota, Robert W. Haupt, Justin G. Chen, and Richard M. Marino, "Laser vibrometry from a moving ground vehicle," Appl. Opt. 50, 2263-2273 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-15-2263

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