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L-Bracket Sensor (Strain Sensor)
This strain sensor is a fiber optic strain long gauge sensor specially designed for long term monitoring of structures. It uses the state of the art optical FBG technology, allowing continuous structural health monitoring. This helps to keep the critical infrastructure under constant supervision. 100% passive sensor without the need for power supply, structure tension and compression monitoring at the same time, universal platform enabling the use of additional sensor types
100% passive sensor
Since the sensor does not need the power supply, it easily monitors places without access to the power and hazardous or inaccessible areas.
Tension and compression
The sensor is pre-strained by default enabling it to monitor tension and compression of any structure.
Universal platform
The strain sensor can also be used in combination with other sensors, such as temperature, inclination, vibration, displacement, etc.
Protected as IP68 rated devices
The protection is comparable to the international standard rating of IP68 and guarantees complete dust tightness and protection against the effects of long periods of immersion in water.
Connectivity
The sensor can be used alone or incorporated into a larger sensing network regardless of sensor interconnections.
Installation costs
Installation and cabling for optical sensor networks are much less expensive and cumbersome than comparable electronic gauge networks.
Immune to EMI/RFI
The sensor enables operation in harsh environments and in hazardous areas. The advantage is immunity to electromagnetic/radio frequency interference.
Leverage the existing fiber optic network
Standard telecommunication optical fibers, for example, dark fibers, can connect the unit and sensors. This is very economical even for a large number of monitored points.
Supplied with mounting accessories
The L-bracket strain sensor can be mounted directly on the surface of a structure, which enables the most accurate measurements of strain. It is supplied with two aluminum L-brackets and fasteners which facilitate the mounting on a structure. The strain difference is then directly measured as a function of elongation or compression of fiber between two fixed points.
Optional accessories
The strain sensor can be supplied with additional optional accessories like a sensor protective cover, customized mounting anchors, connectors, etc.
Example of a typical setup. Choose the project scale that you prefer.
Optical, Environmental and Mechanical
Sensor length:
0.250 m up to 2 m*
Strain range:
-0.5 % compression and +1 % elongation*
Strain sensitivity: 1.2 pm/με
FBG central wavelength:
1505 to 1590 nm @ FBGuard system typically
Temperature sensitivity: 10 pm/ºC
The temperature compensation sensor FBGTC-01 is recommended.
Operational temperature: -20 – +60 °C
Waterproof design: IP68
Fiber Optic Cable
Fiber type: SMF
Fiber input/output:
ruggedized (protected against rough manipulation)
Lead in/out fiber length: 1 m each side*
Fiber termination:
bare fiber (with cladding) – default
FC/APC – optional*
Mounting
Mounting surface: any
Mounting brackets:
aluminum L shaped brackets
60 mm x 45 mm x 31 mm size*
two mounting holes, 27 mm length
supplied with the sensor
* These parameters can be customized upon request.