Auniontech Aut-S100 Fabry–Pérot Cavity Industrial Pressure Sensor

Overview

The Auniontech Aut-S100 Fabry–Pérot Cavity Industrial Pressure Sensor is a high-performance, all-optical pressure transducer engineered for precision static and quasi-static pressure measurement in extreme industrial environments. Unlike conventional piezoresistive or capacitive sensors, the Aut-S100 operates on the physical principle of wavelength-encoded Fabry–Pérot interferometry: pressure-induced axial deformation of a micro-machined silica diaphragm modulates the optical path length within a miniature air-gap cavity formed between two highly reflective dielectric coatings. This spectral shift—detected via broadband optical interrogation—is directly proportional to applied pressure and inherently insensitive to intensity fluctuations, fiber bending, or ambient light coupling. The sensor’s monolithic all-glass construction, absence of metallic sensing elements, and fully passive optical operation make it suitable for intrinsically safe (IS) applications where spark hazards, electromagnetic interference (EMI), or galvanic corrosion preclude conventional electronic transducers.

Key Features

• Intrinsically safe architecture: No electrical components at the sensing point—eliminates explosion risk in flammable atmospheres (ATEX Zone 0/1 compatible when integrated with certified interrogators)
• EMI/RFI immunity: Fully optical signal transmission ensures stable operation near high-voltage switchgear, induction furnaces, MRI systems, or radio-frequency plasma sources
• High-temperature resilience: Hermetically sealed metal-packaged variants maintain calibration integrity up to 200 °C continuous duty; bare-die configurations support custom high-temp embedding
• High-pressure capability: Validated full-scale range of 0–100 MPa with overload tolerance to 150 MPa (FS), suitable for downhole oil & gas monitoring and hydraulic system validation
• Sub-millimeter form factor: Compact cavity geometry enables integration into confined spaces—including turbine blade cooling channels, composite tooling, and aerospace hydraulic manifolds
• Long-term stability: Silica-based optical cavity exhibits negligible hysteresis (<0.1% FS) and thermal drift <0.02% FS/°C over operational range

Sample Compatibility & Compliance

The Aut-S100 is designed for direct mounting onto metallic, ceramic, or composite pressure ports via standard ISO 228-1 (G1/4″) or NPT 1/4″ threaded adapters (custom interfaces available). Its corrosion-resistant Inconel or stainless-steel housing complies with NACE MR0175/ISO 15156 for sour service in oilfield applications. The sensor meets IEC 60079-0 general requirements for explosive atmospheres and supports compliance with IEC 61508 SIL2 when paired with appropriate optical interrogators and safety-rated control logic. While the sensor itself requires no power at the field point, system-level validation must adhere to relevant industry-specific standards including API RP 14C (offshore safety), MIL-STD-810H (shock/vibration), and ASTM E2534 (fiber optic sensor performance testing).

Software & Data Management

The Aut-S100 is compatible with Auniontech’s OEM-grade optical interrogators (e.g., AQ-2000 series), which provide real-time spectral acquisition, cavity order tracking, and temperature-compensated pressure calculation using embedded polynomial calibration coefficients. Interrogator firmware supports IEEE 1451.4 TEDS-compliant metadata storage and exports time-stamped pressure data in CSV, HDF5, or OPC UA formats. For regulated environments, optional audit-trail logging, user-access controls, and 21 CFR Part 11–compliant electronic signatures are available through validated software modules aligned with GLP/GMP documentation workflows.

Applications

• Aerospace: Combustion chamber pressure monitoring in jet engines and rocket propulsion systems
• Defense: Munitions chamber pressure profiling, armor penetration testing, and underwater ordnance diagnostics
• Oil & Gas: Permanent downhole gauge (PDG) deployment in high-temperature/high-pressure (HTHP) wells, subsea Christmas tree monitoring, and pipeline integrity assessment
• Metallurgy: Real-time pressure feedback during hot isostatic pressing (HIP), vacuum arc remelting (VAR), and continuous casting mold control
• Industrial Process Control: Injection molding cavity pressure supervision, extrusion die pressure optimization, and high-pressure chemical reactor safety interlocks

FAQ

What interrogation equipment is required to operate the Aut-S100?
The sensor requires a broadband optical interrogator capable of spectral resolution ≤50 pm and wavelength range covering 1520–1570 nm (C-band). Auniontech recommends the AQ-2000 series or third-party spectrometers meeting IEC 61290-1-3 spectral accuracy requirements.
Can the Aut-S100 be used in vacuum or cryogenic environments?
Yes—the all-silica cavity design functions reliably from 10⁻⁶ mbar vacuum to ambient pressure; however, low-temperature operation below −40 °C requires qualification of packaging thermal contraction mismatch and fiber coating brittleness.
Is factory recalibration required after installation?
No—each unit is individually calibrated at multiple temperatures and pressures prior to shipment; zero-shift verification post-installation is sufficient for most applications.
How does the Aut-S100 handle dynamic pressure events?
The sensor’s mechanical resonance frequency exceeds 100 kHz, supporting measurement of pressure transients with rise times >10 µs; for higher-frequency analysis (>1 MHz), consult application engineering for cavity damping optimization.
Are custom calibration curves available for non-standard media or mounting configurations?
Yes—Auniontech provides traceable NIST-calibrated datasets and supports customer-specific calibration protocols under ISO/IEC 17025 accredited procedures.