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Optical microphone hears ultrasound

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An Austrian start-up describes how its membrane-free optical microphone technology is being put to good use in ultrasonic non-destructive testing and process control.

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Figure 1: The membrane-free optical microphone.
Figure 2: Ultrasound scan of a carbon fibre composite plate that has internal defects, obtained with the optical sensor.
Figure 3: Acoustic emission monitoring at CERN, where the robustness of different materials against proton-induced damage is being investigated.

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Authors and Affiliations

  1. Balthasar Fischer is at XARION Laser Acoustics GmbH, Ghegastrasse 3, 1030 Wien, Austria,

    Balthasar Fischer

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  1. Balthasar Fischer
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Correspondence to Balthasar Fischer.

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Competing interests

The author is founder of XARION Laser Acoustics GmbH, which commercializes the technology discussed here.

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Fischer, B. Optical microphone hears ultrasound. Nature Photon 10, 356–358 (2016). https://doi.org/10.1038/nphoton.2016.95

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