Optical spatial filtering velocimetry sensor for real-time in-plane vibration control

M. L. Jakobsen; H. E. Larsen; S. P. Pedersen; S. G. Hanson

doi:10.1117/12.663560

22 April 2006 Optical spatial filtering velocimetry sensor for real-time in-plane vibration control

M. L. Jakobsen, H. E. Larsen, S. P. Pedersen, S. G. Hanson

Proceedings Volume 6189, Optical Sensing II; 61891A (2006) https://doi.org/10.1117/12.663560
Event: SPIE Photonics Europe, 2006, Strasbourg, France

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.

Citation Download Citation

M. L. Jakobsen, H. E. Larsen, S. P. Pedersen, and S. G. Hanson "Optical spatial filtering velocimetry sensor for real-time in-plane vibration control", Proc. SPIE 6189, Optical Sensing II, 61891A (22 April 2006); https://doi.org/10.1117/12.663560

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