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Proceedings Paper

Optical spatial filtering velocimetry sensor for real-time in-plane vibration control
Author(s): M. L. Jakobsen; H. E. Larsen; S. P. Pedersen; S. G. Hanson
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Paper Abstract

We present a compact, non-contact, low-cost optical sensor for real time vibration detection and active vibration control of mechanical devices based on laser speckle translation. The speckle translation is processed optically with a narrow spatial filter to provide electrical signals carrying in-phase and phase quadrature information about the speckle motion. The optical sensor is integrated with an ASIC. The ASIC and an external programmable logical device (PLD) calculate a real time electrical error signal, which then is fed back a piezo-electrical crystal. For testing purposes a mechanical sinusoidal vibration is applied to the target via a piezo-electrical spacer. The error signal deforms the piezo-electrical spacer in order to counteract and minimize the vibrational motion of the target. The primary purpose of this work is to demonstrate the feasibility of producing a compact, low-cost sensor that carries out single-point measurement of submicron, in-plane translational vibration of a solid structure in real time.

Paper Details

Date Published: 22 April 2006
PDF: 8 pages
Proc. SPIE 6189, Optical Sensing II, 61891A (22 April 2006); doi: 10.1117/12.663560
Show Author Affiliations
M. L. Jakobsen, Risoe National Lab. (Denmark)
H. E. Larsen, Risoe National Lab. (Denmark)
S. P. Pedersen, Risoe National Lab. (Denmark)
S. G. Hanson, Risoe National Lab. (Denmark)


Published in SPIE Proceedings Vol. 6189:
Optical Sensing II
Brian Culshaw; Anna G. Mignani; Hartmut Bartelt; Leszek R. Jaroszewicz, Editor(s)

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