Auniontech Aut-S600 Fiber Bragg Grating Micro-Strain Sensor

Overview

The Auniontech Aut-S600 Fiber Bragg Grating (FBG) Micro-Strain Sensor is an engineered optical sensing device designed for high-fidelity, long-term static and quasi-static strain monitoring in civil infrastructure and critical industrial assets. It operates on the fundamental principle of wavelength-encoded strain transduction: mechanical deformation induces a linear shift in the Bragg wavelength (λ_B) of the embedded grating, governed by the photoelastic effect and geometric elongation. This shift—measured in picometers—is directly proportional to axial microstrain (με), enabling traceable, absolute measurement without drift or zero-point degradation. Unlike resistive strain gauges, the Aut-S600 is immune to electromagnetic interference (EMI), galvanic corrosion, and lightning-induced surges—making it suitable for deployment in electrically noisy, explosive, or high-voltage environments such as power substations, wind turbine blades, and rail track beds. Its all-dielectric construction and passive operation eliminate intrinsic power requirements at the sensing point, supporting distributed multiplexing over single-mode fiber up to tens of kilometers.

Key Features

• Adhesive-free encapsulation technology ensures long-term stability and eliminates creep-induced signal hysteresis common in epoxy-bonded FBG sensors.
• Pre-strained FBG element mounted on stainless steel or flexible polymer substrate enables repeatable, linearity-preserving strain transfer across thermal and mechanical cycling.
• Two-fiber-pigtail configuration (input/output) allows daisy-chain multiplexing—up to 30+ sensors per fiber line using standard wavelength-division multiplexing (WDM) interrogation.
• Robust mechanical packaging meets IEC 60793-2-50 and Telcordia GR-1221-CORE specifications for tensile strength, bend radius, and crush resistance.
• Factory-calibrated temperature-compensated strain response with documented traceability to NIST-traceable reference standards.
• FC/APC connector interface ensures low back-reflection (<−60 dB) and compatibility with commercial FBG interrogators from Micron Optics, HBM FiberSensing, and Luna Innovations.

Sample Compatibility & Compliance

The Aut-S600 is compatible with conventional surface-mounting techniques used for foil strain gauges—including spot welding (for metallic substrates), cyanoacrylate bonding (for non-conductive surfaces), and mechanical clamping via custom brackets. Its lightweight design (<25 g) imposes negligible inertial loading on thin-walled or vibration-sensitive structures. The sensor conforms to ASTM E2872–22 (Standard Guide for Structural Health Monitoring of Bridges Using Optical Fiber Sensors) and supports compliance with ISO 14971:2019 (risk management for medical devices) where deployed in regulated biomedical instrumentation. For nuclear or aerospace applications, the device satisfies MIL-STD-810H environmental test profiles for shock, vibration, and thermal cycling (−40 °C to +300 °C). All units undergo 100% spectral verification, including FWHM (12 dB), and reflectivity (>70%) screening prior to shipment.

Software & Data Management

Raw Bragg wavelength data from the Aut-S600 is acquired via third-party FBG interrogation systems supporting IEEE 1451.4 TEDS (Transducer Electronic Data Sheet) metadata embedding. Auniontech provides optional ASCII-based calibration files (.csv) containing polynomial coefficients for strain/temperature cross-sensitivity correction. When integrated into SCADA or cloud-based SHM platforms (e.g., Siemens Desigo CC, Bentley AssetWise), the sensor supports audit-ready data logging compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, change history, and secure user access control. Time-synchronized acquisition at ≤10 Hz sampling rate enables modal analysis and slow-drift trending without aliasing artifacts.

Applications

• Long-term structural health monitoring (SHM) of bridges, dams, tunnels, and historical masonry—tracking creep, settlement, and fatigue accumulation over decades.
• In situ strain validation during pre-stressed concrete curing and post-tensioning operations, meeting ACI 318 and EN 1992-1-1 requirements.
• Thermal-mechanical strain mapping on composite fuselage panels, rocket motor casings, and satellite solar array hinges under vacuum and thermal cycling.
• Distributed load testing of railway sleepers, offshore platform jackets, and wind turbine tower base sections under operational loading spectra.
• Multi-point strain rosettes for experimental stress analysis in laboratory-scale mechanical testing frames (ASTM E8/E21).

FAQ

What is the maximum number of Aut-S600 sensors that can be multiplexed on a single fiber?
Up to 32 sensors are supported within the C-band (1528–1568 nm) using 0.8 nm channel spacing and standard broadband light sources with ≥40 nm spectral width.
Does the Aut-S600 require temperature compensation during strain measurement?
Yes—simultaneous temperature measurement using a co-located FBG temperature sensor or built-in dual-grating configuration is required for quantitative strain resolution below ±5 με accuracy.
Can the Aut-S600 be embedded in concrete during casting?
Yes—its metal or flexible encapsulation and adhesive-free design allow direct embedment; however, strain transfer efficiency must be validated per ACI 237R-17 guidelines for embedded optical sensors.
Is the sensor compatible with existing FBG interrogation hardware?
Yes—the Aut-S600 meets ITU-T G.671 spectral grid alignment and operates with any C-band FBG interrogator supporting ≥0.1 pm wavelength resolution and FC/APC interface.
What documentation is provided for regulatory validation?
Each unit ships with a Certificate of Conformance, spectral characterization report, calibration certificate (traceable to NIST SRM 2800), and RoHS/REACH compliance statement.