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Evotis plastic

The Evotis Plastic sensor is a fiber‑optic acoustic pressure sensor specifically designed for demanding environments. It is optimized for detecting sounds in the high audible frequency range, offering high sensitivity and exceptional robustness. Thanks to its compact size and light weight, it enables precise measurements in confined or hard‑to‑reach spaces, particularly in complex industrial applications.

  • Main Features



    • Transducer type: Silicon nitride membrane

    • Operating mode: Differential (rear-vented)

    • Natural frequency: 15 kHz

    • Bandwidth: 20 Hz – 15 kHz (±3 dB)

    • Sensitivity: 10 mV/Pa

    • Self‑noise: 30 dB SPL (1 Hz BW) / 20 dB SPL with low‑noise module

    • Max dynamic pressure: 0.05 bar (~ 167 dB SPL)

    • Damage threshold: > 0.1 bar (~ 173 dB SPL)

    • Sound field: optimized for free field

    • Dimensions: 10 mm × 23 mm

    • Weight: 2 g

    • Material: Ultem™ or equivalent

    • Fiber cable: 2 m (50/125 OM2 multimode)

    • Temperature range: -20 °C to 65 °C (short‑term peak to 85 °C)

    • Waterproof rating: IP65

    • Full EMI/RFI immunity

  • Typical use cases



    • Monitoring cracks in industrial furnaces

    • Non‑destructive testing (NDT)

    • High‑voltage measurements (overhead power lines, transformers)

    • Voice measurement in MRI environments

    • Applications in explosive‑atmosphere (ATEX) environments

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