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Adaptive self-mixing vibrometer based on a liquid lens.

U Zabit1, R Atashkhooei, T Bosch

  • 1Centre de Desenvolupament de Sensors, Instrumentació i Sistemes (CD6), Universitat Politecnica de Catalunya,Rambla Sant Nebridi 10 E08222 Terrassa, Spain. usman.zabit@enseeiht.fr

Optics Letters
|April 23, 2010
PubMed
Summary

A novel liquid lens (LL) in a self-mixing laser diode vibrometer enhances measurement range. This adaptive optics approach improves displacement sensing accuracy over extended distances, from 6.5 cm to 265 cm.

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Area of Science:

  • Optics and Photonics
  • Sensing Technology
  • Vibration Measurement

Background:

  • Self-mixing laser diode vibrometers are sensitive to optical feedback levels.
  • Extended sensor-to-target distances are challenging for traditional vibrometers.
  • Adaptive optical elements offer potential for feedback control.

Purpose of the Study:

  • To implement and demonstrate a self-mixing laser diode vibrometer with an adaptive liquid lens (LL).
  • To control the optical feedback level for optimal displacement measurements.
  • To significantly extend the feasible working range of the vibrometer.

Main Methods:

  • Integration of a liquid lens (LL) as an adaptive optical element into a self-mixing laser diode vibrometer.
  • Utilizing the LL to actively manage the optical feedback regime, maintaining it in a moderate range.

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  • Comparative analysis of vibration signal reconstruction accuracy against a commercial sensor.

    • Main Results:

    • The liquid lens (LL) successfully controlled the feedback level, maintaining a moderate regime suitable for displacement sensing.
    • A substantial increase in the sensor-to-target distance range was achieved, from 6.5 cm to 265 cm.
    • Vibration signal reconstructions showed a maximum error of lambda radical16 compared to a commercial sensor.

    Conclusions:

    • The adaptive liquid lens (LL) is effective in enhancing the performance of self-mixing laser diode vibrometers.
    • This technology enables robust vibration measurements over significantly longer distances.
    • The developed vibrometer offers an improved and extended working range for various applications.