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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