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Adaptive self-mixing vibrometer based on a liquid lens

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Abstract

A self-mixing laser diode vibrometer including an adaptive optical element in the form of a liquid lens (LL) has been implemented and its benefits demonstrated. The LL arrangement is able to control the feedback level of the self-mixing phenomenon, keeping it in the moderate feedback regime, particularly suitable for displacement measurements. This control capability has enabled a remarkable increase in the sensor-to-target distance range where measurements are feasible. Target vibration signal reconstructions present a maximum error of λ16 as compared with a commercial sensor, thus providing an improved working range of 6.5cmto265cm.

© 2010 Optical Society of America

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