Adaptive self-mixing vibrometer based on a liquid lens.
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 lambda radical16 as compared with a commercial sensor, thus providing an improved working range of 6.5 cm to 265 cm.
Zabit
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Centre de Desenvolupament de Sensors, Instrumentació i Sistemes (CD6), Universitat Politecnica de Catalunya,Rambla Sant Nebridi 10 E08222 Terrassa, Spain. usman.zabit@enseeiht.fr
Atashkhooei
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Bosch
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Royo
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Bony
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Rakic
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