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FBG Sensors

INFIBRA TECHNOLOGIES can offer a range of FBG-based different sensors as well as supplies custom solution starting from single FBGs and arrays of FBGs. A short list of standard solutions is reported below, click on the picture in a selected tab to read the specifications.

Single FBG can be used for sensing temperature and strain as well as for many physical and chemical parameters if properly packaged. Several coatings (acrylate, polyimide or metallic) and manufacturing parameters (length, bandwidth, peak reflecticvity) are available for industrial applications, even in harsh environments with ATEX and high temperatures requirements.

Single FBG
Single Fiber Bragg Grating

 

Typical applications:

• Civil engineering
• Transportation
• Chemical Processes
• Power
• Oil&Gas
• Automotive & Aerospace
• Medical & Robotics
• Telecommunications
• Reasearch & Development

FBG specifications:

FBG Wavelength (CWL)	1.500 ÷ 1.600 nm (other on request)
FBG Wavelength tolerance (CWLT)	± 0,5 nm (other on request)
FBG Bandwidth (FWHM)	0,1 nm to 1 nm (other on request)
FBG Reflectivity Peak (R)	Up to 99 % (50% typical)
Side Lobe Suppression Ratio (SLSR)	> 15dB (other on request)
FBG Length (L)	1 ÷ 12 mm (other on request)
Fiber Type	Standard single-mode, Bend insensitive, Pure core silica, (others on request)
Fiber coating	Acrylate (up to 80°C), High Temperature Acrylate (up to 150°C), Polyimide (up to 250°C, short term 400°C), Metal coating on request (up to 700°C)
Fiber pigtail length	1 m both side (other on request)
Optical connector	FC/APC (other on request)
Packaging options	Tubing (e.g. polymeric, stainless steel, PEEK, PTFE), extra buffer ruggedization (other on request)

Download Datasheet

Array of FBGs can be offered in a wide range of optical specifications and material options to meet all customer requirements. It is possible to write dozens of FBG in a single optical fiber. Custom FBG spacing, several coatings and manufacturing parameters (length, bandwidth, peak reflecticvity) are available for quasi-distributed long-term sensing applications.

Array of FBGs
Single Fiber with Array of Bragg Gratings

 

Typical applications:

• Civil engineering
• Transportation
• Chemical Processes
• Power
• Oil&Gas
• Automotive & Aerospace
• Medical & Robotics
• Telecommunications
• Reasearch & Development

Array of FBGs specifications:

Number of FBGs per array	Up to 50 (higher on request)
FBGs Spacing	>15 mm (other on request)
FBG Wavelength (CWL)	1.500 ÷ 1.600 nm (other on request)
FBG Wavelength tolerance (CWLT)	± 0,5 nm (other on request)
FBG Bandwidth (FWHM)	0,1 nm to 1 nm (other on request)
FBG Reflectivity Peak (R)	Up to 99 % (50% typical)
Side Lobe Suppression Ratio (SLSR)	> 15dB (other on request)
FBG Length (L)	1 ÷ 12 mm (other on request)
Fiber Type	Standard single-mode, Bend insensitive, Pure core silica, (others on request)
Fiber coating	Acrylate (up to 80°C), High Temperature Acrylate (up to 150°C), Polyimide (up to 250°C, short term 400°C), Metal coating on request (up to 700°C)
Fiber pigtail length	1 m both side (other on request)
Optical connector	FC/APC (other on request)
Packaging options	Tubing (e.g. polymeric, stainless steel, PEEK, PTFE), extra buffer ruggedization (other on request)

Download Datasheet

HT-Tube500 is a in-well temperature sensor for harsh environments with operating temperatures up to 500 °C (600 °C R&D). Its stainless steel rigid metallic tube (5 mm typical outer diameter) holds a cascade of FBG sensors, which enables the insertion temperature profile over the thickness of components.

HT-Tube500
Rugged In-Well High Temperature FBG Sensor

 

Typical applications:

• Machine Condition Monitoring
• Power Plants Transformers
• Chemical Processes
• Conveyor Systems
• High Temperature Environments

Physical specifications:

Sensor Construction	Rigid Loose Tube
Dimension (φ x L)	Tube diameter and sensor length to suit application
Package material	Stainless steel AISI 304 or other options
Fixing method	Swagelok , Glue

Optical specifications:

Fiber Type	Single-mode SMF-28  9/125 μm
FBG Wavelength (CWL)	1.460 ÷ 1.620 nm
FBG Bandwidth (FWHM)	0,25 nm (typical)
FBG Peak Reflectivity (R)	> 50 %
Side Lobe Suppression Ratio (SLSR)	> 15dB
Sensors Spacing (D)	>7 mm (Customizable)
Sensors Number	Custom to suit application
Measurement Range	-50 to 500 °C (600 °C R&D)
Sensor Resolution	0,1 °C (depending on FBG interrogator)
Sensor Accuracy	0,5 °C (depending on FBG interrogator)
Cable Length and Connector	to suit application

Download Datasheet

HT-Flex500 is a flexible temperature sensor for harsh environments with operating temperatures up to 500 °C (600 °C R&D). Its stainless steel flexible capillary tube (1.2 mm typical diameter) holds a cascade of FBG sensors, which enables both surface and embedded installations, even within extremely small wells.

HT-Flex500
Flexible High Temperature FBG Sensor

 

Typical applications:

• Machine Condition Monitoring
• Power Plants Transformers
• Chemical Processes
• Conveyor Systems
• High Temperature Environments

Physical specifications:

Sensor Construction	Capillary Loose Tube
Dimension (φ x L)	1.2 mm x L (Sensor Length to suit application)
Flexibility	Down to 300 mm diameter
Package material	Stainless steel AISI 304 or other options

Optical specifications:

Fiber Type	Single-mode SMF-28  9/125 μm
FBG Wavelength (CWL)	1.460 ÷ 1.620 nm
FBG Bandwidth (FWHM)	0,25 nm (typical)
FBG Peak Reflectivity (R)	> 50 %
Side Lobe Suppression Ratio (SLSR)	> 15dB
Sensors Spacing (D)	> 7 mm  (Customizable)
Sensors Number	Custom to suit application
Measurement Range	-50 to 500 °C (600 °C R&D)
Sensor Resolution	0,1 °C (depending on FBG interrogator)
Sensor Accuracy	0,5 °C (depending on FBG interrogator)
Cable Length and Connector	to suit application

Download Datasheet

FTT-01 is a customizable fiber-optic-based force and mechanical moment sensor designed for precision load monitoring in bolted joints and structural interfaces. Based on Fiber Bragg Grating (FBG) technology, it is engineered to function in extreme temperature environments and wide dynamic range.

FTT-01
Smart Washer for Bolted Joints

 

Typical applications:

• Structural load monitoring
• Aerospace and automotive testing
• Industrial machinery diagnostics
• Smart bolted connections
• Harsh environment force sensing

Physical specifications:

Form factor	Customizable (Inner hole, shape)
Minimum Outer Diameter	25 mm (<25 mm R&D)
Minimum Thickness	4 mm (<4 mm R&D)
Package material	Application customizabled (e.g. aluminum. stainless steel, titanium)
Operating Temperature	-80 °C to +250 °C
IP Grade	up to IP68

Measurement specifications:

Measurement Capacities	> 30 kN
Sensor Technology	Multiple Fiber Bragg Gratings (FBGs)
Resolution	Up to 0.05% of full scale (application dependent)
Sampling Rate	Depending on used FBG interrogator
FBG Central Wavelength	Within the range 1460 ÷ 1620 nm
FBG Bandwidth	1 nm (typical)
Temperature Compensation	Reference Temperature FBGs (optional)

Download Datasheet
Video Demo Youtube Channel

FBG Instruments

INFIBRA TECHNOLOGIES can offer a range of FBG interrogators based on the different technologies provided by its international partners. Listed below you can find the proprietary instruments only, click on the picture in a selected tab to read the specifications.

FBG.HUB UNIT is an active multiplexer which can be used in combination with FBG interrogators for the acquisition, log and communication of FBG-based sensors. Each of 4 input channels can be connected to a channel of a compatible FBG interrogator in order to expand the acquisition channel from 1 to 16. This capability allows the acquisition of 4 x 16 = 64 switched channels.

FBG HUB UNIT

 

• 64 scanning channels
• Rackmount form factor
• Different FBG interrogator compatibility
• TCP/IP Modbus communication
• On-board SD logging
• Customizable switching time

Measurement and Processing:

Wavelength Range	300 nm (1300-1600 nm)
Number of Input Channels	4
Number of Output Channels	64
Insertion Loss	<1.7 dB (Typical 0.7 dB)
Number of sensors	Depending on FBG interrogator
Polarization dependent loss	< 0.15 dB
Repeatability	< 0.01 dB
Minimum switching time	< 10 ms (typical 5 ms)
Durability	MEMS technology - no wear out
Communication	TCP/IP Modbus
Onboard Logging	External SD for logging
Certifications	CE

Mechanical, Environmental and Electrical:

Dimensions	19" standard RACK, 3U height, 84HP depth
Weight	3 kg
Operating Temperature	-10 to 50 °C (10-90% RH non condensating)
Storage temperature	-20 to 85 °C
Comms Interface	Ethernet
Optical Connector	LC/APC
Power supply	19 - 36 Vdc (typical 24 Vdc)

Donwload the Datasheet.

OFS-M1 is an active opto-electronic device which can be used in combination with FBG interrogators in order to direct the optical signal from an input port to one of its output ports. In particular, it acts as a dynamic light path switch, with portability capability, controllable through a PC connected to the device via USB port.

OFS-M1

 

• 4 scanning channels
• Portable form factor
• Different FBG interrogator compatibility
• USB communication
• 5V power supply
• Customizable switching mode

Measurement:

Wavelength Range	420 nm (1250-1670 nm)
Number of Input Channels	1
Number of Output Channels	4
Insertion Loss	<1 dB (Typical 0.5 dB)
Number of sensors	Depending on FBG interrogator
Repeatability	<0.1 dB
Minimum switching time	<10 ms (Typical 5 ms)
Communication	USB – Driver Labview included
Certifications	CE

Mechanical, Environmental and Electrical:

Dimensions	125 mm x 52.6 mm x 136 mm
Weight	100 g
Operating Temperature	-10 to 70 °C (10-90% RH non condensating)
Storage temperature	-20 to 85 °C
Comms Interface	USB
Optical Connector	LC/APC
Power supply	5 Vdc (micro-USB)

Donwload the Datasheet.

Integration Services

We strongly believe in cooperation with our partners and that one of the keys to the successful application of fiber optic sensors lies in their embedding capability. For that purpose, we offer several integration services in materials, structures and assets in general.

Our laboratories are comprehensive of equiments and softwares for: