Evotis Standard
The Evotis sensor is a dynamic fiber-optic acoustic pressure sensor designed for harsh environments. Thanks to its silicon nitride membrane, it provides high sensitivity in the audible range, with excellent thermal resistance (up to 350 °C at peak). Compact and robust, it is factory-calibrated and engineered for open-field use under extreme conditions (ATEX, high voltage, demanding industrial environments).
Main Features
Transducer type: Silicon nitride membrane
Operating mode: Differential (rear vented)
Natural frequency: 15 kHz
Useful frequency range: 20 Hz – 15 kHz (±3 dB)
Max dynamic pressure: 0.05 bar (~167 dB SPL)
Damage threshold: > 0.1 bar (~173 dB SPL)
Self-noise: 30 dB SPL (20 dB with low-noise electronics)
Sensitivity: 5 mV/Pa
Sound field: Omnidirectional, free field
Operating temperature: -40 °C to 300 °C (peak to 350 °C)
EMI/RFI immunity: Full
Protection rating: IP65
Materials: Kovar™ or equivalent
Sensor dimensions: 10 mm × 23 mm (weight: 2 g)
Fiber: Multimode 50/125 OM2, 2 m long
Use cases
Monitoring cracks in industrial furnaces
Non‑destructive testing
High‑voltage measurements: overhead lines, transformers
Vocal MRI applications
ATEX environments or explosive‑atmosphere zones
Acoustic studies in confined spaces, such as pipelines
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