When your fiber-based sensor system is made for a grand scale, the optical and mechanical characteristics of the FBG array must be maintained over a very long length, up to multiple kilometers of fiber that could include multiple dozens of gratings. Over the years, we have been able to adapt our robust FBG writing process to array manufacturing, controlling with precision the position of each FBG over the length of a fiber spool, minimizing or even removing the need for splices.
Fiber Bragg Gratings written inside optical fibers provide high resolution and robustness ideal for temperature or mechanical strain sensing applications. In the fields of transport, aviation, and aerospace to civil engineering and oil & gas, more and more real-time safety and function monitoring is necessary. This technology can be to measure the strain in a concrete structure, the movement of an aircraft wing, the detection of leaks in pipelines…
When your application requires multiple gratings over a long or short distance, we can provide splice-less FBG arrays made with the same proven writing process than our line of single FBG sensors, with the same wide variety of optical and mechanical parameters. They can be made up to km-long in length, with dozens of FBG at specific locations, with complete control of the optical parameters of each individual grating.
Our standard configurations include precise peak wavelength fiber Bragg gratings written on specialized acrylate or polyimide coated fibers for high mechanical strength. The spacing between two individual gratings can be as small as millimeters or as longs as tens of meters, with precise location control in both cases.
In terms of optical characteristics, both very low or very high reflectivity values are possible, with a wide range of central wavelengths and bandwidths available, to match the spectral shape you need. Each FBG can be extremely if necessary, or individually custom specified at different wavelengths.
We can work with standard, bend-insensitive or high-temperature acrylate and polyimide coated fibers, with 125um or 80um diameters, recoating them right after the FBG writing step for optimal process stability and reliability. If necessary, non-recoated FBGs are also available. The single mode fibers we use will be compatible with different type of interrogator systems for measurement and analysis.
All these features mean that ITF’s FBG arrays for sensors are ideal when in use in real-life applications. The data acquired by an optical interrogator will be accurate, repeatable and trustworthy over the full length of the fiber spool when deployed.
Examples of FBG array applications: