FBG optical-fiber strain gauge for structural health monitoring, immune to electromagnetic interference and suitable for long cable runs.
Overview
The FBG strain gauge is a novel optical-fiber sensor based on the Fiber Bragg Grating wavelength-modulation principle: as the host structure strains, the grating embedded in a metal substrate deforms and its reflected center wavelength B shifts linearly; a demodulator measures the wavelength shift and converts it to strain. Being optically passive, the sensor is intrinsically safe, immune to electromagnetic interference, electrically insulated, corrosion-resistant, and supports wavelength-division multiplexing along a single fiber (many points on one cable). With stainless-steel or aluminum-alloy substrate packaging, it can be surface-bonded or embedded in concrete. Widely used for long-term health monitoring of long-span bridges, dams, high-rises, tunnels, composites and rail transit structures.
Applications
• Road and highway engineering laboratory testing
• Construction material quality control and acceptance
• Research and teaching laboratories
• Third-party inspection and certification bodies
Features
• Robust construction suitable for both laboratory and field use
• Compliant with relevant Chinese and international testing standards
• Complete with calibration certificate and operation manual
Technical Specifications
| Item | Specification |
| Principle | Fiber Bragg Grating (wavelength modulation) |
| Substrate | stainless steel / aluminum alloy |
| Gauge length | 36 / 72 / 108 mm selectable |
| Strain sensitivity | approx. 1.2 pm/µε (1550 nm band) |
| Center wavelength | 1525–1565 nm (C-band) |
| Strain range | typical ±1500 to ±5000 µε |
| Temp. range | approx. -55 to +120°C |
| Resolution | approx. 0.1–1 µε |
| Linearity | better than 0.5% FS |
| Reflectivity | ≥ 90% |
| Multiplexing | many points on one fiber (WDM) |
| Output | wavelength signal, optical link |
| Advantages | intrinsically safe, EMI-immune, insulated, corrosion-resistant |
| Mounting | surface bond / embed in concrete |
| Applications | bridges, dams, high-rises, tunnels, composites |
Standards
GB/T, JTG, ASTM
Standard Delivery
• Main instrument unit
• Power cable
• Operation manual
• Spare parts kit
FAQ
Q1: What standards does the Fiber Bragg Grating (FBG) Strain Gauge comply with?
A1: The Fiber Bragg Grating (FBG) Strain Gauge is designed and manufactured in accordance with relevant Chinese national (GB) and transport industry (JTG) standards, as well as applicable ASTM and AASHTO international standards. A calibration certificate traceable to national standards is provided with each unit.
Q2: How often should the Fiber Bragg Grating (FBG) Strain Gauge be calibrated?
A2: We recommend annual calibration by authorized technicians or by iRoad after-sales service center. For high-frequency laboratory use, semi-annual calibration is advised. The instrument is supplied with a factory calibration certificate.
Q3: What is the lead time and do you provide training?
A3: Standard units are usually shipped within 7-15 working days. Custom configurations may require 20-30 days. iRoad provides on-site installation, commissioning and operator training for major equipment; remote video guidance is available for standard laboratory instruments.
Overview
The FBG strain gauge is a novel optical-fiber sensor based on the Fiber Bragg Grating wavelength-modulation principle: as the host structure strains, the grating embedded in a metal substrate deforms and its reflected center wavelength B shifts linearly; a demodulator measures the wavelength shift and converts it to strain. Being optically passive, the sensor is intrinsically safe, immune to electromagnetic interference, electrically insulated, corrosion-resistant, and supports wavelength-division multiplexing along a single fiber (many points on one cable). With stainless-steel or aluminum-alloy substrate packaging, it can be surface-bonded or embedded in concrete. Widely used for long-term health monitoring of long-span bridges, dams, high-rises, tunnels, composites and rail transit structures.
Applications
• Road and highway engineering laboratory testing
• Construction material quality control and acceptance
• Research and teaching laboratories
• Third-party inspection and certification bodies
Features
• Robust construction suitable for both laboratory and field use
• Compliant with relevant Chinese and international testing standards
• Complete with calibration certificate and operation manual
Technical Specifications
| Item | Specification |
| Principle | Fiber Bragg Grating (wavelength modulation) |
| Substrate | stainless steel / aluminum alloy |
| Gauge length | 36 / 72 / 108 mm selectable |
| Strain sensitivity | approx. 1.2 pm/µε (1550 nm band) |
| Center wavelength | 1525–1565 nm (C-band) |
| Strain range | typical ±1500 to ±5000 µε |
| Temp. range | approx. -55 to +120°C |
| Resolution | approx. 0.1–1 µε |
| Linearity | better than 0.5% FS |
| Reflectivity | ≥ 90% |
| Multiplexing | many points on one fiber (WDM) |
| Output | wavelength signal, optical link |
| Advantages | intrinsically safe, EMI-immune, insulated, corrosion-resistant |
| Mounting | surface bond / embed in concrete |
| Applications | bridges, dams, high-rises, tunnels, composites |
Standards
GB/T, JTG, ASTM
Standard Delivery
• Main instrument unit
• Power cable
• Operation manual
• Spare parts kit
FAQ
Q1: What standards does the Fiber Bragg Grating (FBG) Strain Gauge comply with?
A1: The Fiber Bragg Grating (FBG) Strain Gauge is designed and manufactured in accordance with relevant Chinese national (GB) and transport industry (JTG) standards, as well as applicable ASTM and AASHTO international standards. A calibration certificate traceable to national standards is provided with each unit.
Q2: How often should the Fiber Bragg Grating (FBG) Strain Gauge be calibrated?
A2: We recommend annual calibration by authorized technicians or by iRoad after-sales service center. For high-frequency laboratory use, semi-annual calibration is advised. The instrument is supplied with a factory calibration certificate.
Q3: What is the lead time and do you provide training?
A3: Standard units are usually shipped within 7-15 working days. Custom configurations may require 20-30 days. iRoad provides on-site installation, commissioning and operator training for major equipment; remote video guidance is available for standard laboratory instruments.
