Common path michelson interferometer based on multiple reflections within the sample arm: Sensor applications and imaging artefacts

Nikola Krstajić, David Childs, Rod Smallwood, Richard Hogg, Stephen J. Matcher

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    We present a simple common path dual beam interferometric sensor platform using a low-coherence source. In our implementation we exploit (in a controlled manner) the multiple reflections within the sample arm to provide the reference arm. This simple setup removes the need for a separate reference arm and allows an alternative architecture for using low-coherence sources in interferometric sensors. We demonstrate the sensor characteristics by using it as a vibrometer and displacement sensor (without directional sensitivity). Vibration frequencies from 50 to 300 Hz were measured with 1% precision while displacements from 6 to 24 μm were measured with 125 nm precision and 625 nm resolution. We discuss improvements, limitations and potential applications. Lastly, we point to the artefactual appearance of this sensor in optical coherence tomography setups.

    Original languageEnglish
    Article number027002
    JournalMeasurement Science and Technology
    Volume22
    Issue number2
    Early online date23 Dec 2010
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Common path interferometry
    • Displacement sensor
    • Fibre-optic sensors
    • Interferometric sensor
    • Low-coherence interferometry
    • Michelson interferometer
    • Optical coherence tomography
    • Superluminescent diodes
    • Vibrometer

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