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All Grating Fibers (AGF®)

The All Grating Fiber (AGF®) is an optical fiber containing densely spaced low reflective (R<0.1%)  Draw Tower Gratings (DTG®s). The spatial separation from center to center can be as small as 10mm and the FBG length can be chosen such that more than 95% of the fiber contains gratings.

The All Grating Fiber (AGF®) is an optical fiber containing densely spaced low reflective (R<0.1%)  Draw Tower Gratings (DTG®s). The spatial separation from center to center can be as small as 10mm and the FBG length can be chosen such that more than 95% of the fiber contains gratings. The fiber is designed to be used with an OFDR (optical frequency domain reflectometry) system that allows for fast and precise measurements over a wide strain or temperature range with spatial resolution down to a few mm over the entire fiber length.

AGF-LBL-1550-125

The Low Bend Loss fiber LBL-1550-125 has a cladding diameter of 125µm and is optimized for operation in the 1550nm wavelength window. The glass composition has also been tuned such that the fiber maintains a good signal transmission under small bending diameters.

AGF-LAL-1550

The Low Attenuation Loss fiber LAL-1550-125 has a cladding diameter of 125µm and is optimized for operation in the 1550nm wavelength window. The glass composition has also been tuned such that the fiber gives a good compromise between signal transmission under small bending diameters and attenuation.

AGF-LBL-1550-80

The Low Bend Loss fiber LBL-1550-80 has a cladding diameter of 80µm and is optimized for operation in the 1550nm wavelength window. The glass composition has also been tuned such that the fiber maintains a good signal transmission under small bending diameters.

Parameter AGF-LBL-1550-125 AGF-LAL-1550 AGF-LBL-1550-80
Reflectivity (for grating length of 8mm) < 0.1%
Centre wavelength 1510–1590 nm
Absolute wavelength accuracy1 ≤ 0.5 nm
DTG® length 1–10 mm
Attenuation @ 1550 nm < 8.6 dB/km < 1 dB/km < 8.6 dB/km
Mode Field Diameter (MFD) @ 1550 nm 6 μm (typical) 7.8 μm (typical) 6 μm (typical)
Numerical Aperture (NA) 0.26 (typical) 0.14 (typical) 0.26 (typical)
Cladding diameter 125 μm ± 1 μm 80 μm ± 1 μm
Coating type2 ORMOCER®/ORMOCER®-T / One layer Acrylate
Coated fibre diameter 195 μm (typical) 120 μm (typical)
Tensile load at break3 > 50 N (corresponds to > 5% strain) > 20 N (corresponds to > 5% strain)
Temperature sensitivity4 (formula Δλ/(λ ⋅ ΔT)) 6.5 K-1 ⋅ 10-6 (typical)
Strain sensitivity1 (formula: Δλ/(λ ⋅ Δε)) 7.8 με-1 ⋅ 10-7 (typical)
Operational temperature range5 -200–200°C for ORMOCER®
-20–200°C for ORMOCER®-T
-20–90°C for One layer Acrylate

1 measured at room temperature
2 Ormocer® is mainly applied for strain measurements while Ormocer®-T is recommended for temperature measurements.
3 According to IEC-60793-1-31 using a constant displacement of 30mm/minute.
4 measured between 0°C and 70°C
5 temperature range is dependent on exposure time

 

The ability to measure multiple sensing points over large intricate surfaces can be a difficult task. Traditionally engineers have used electrical strain gauges to monitor many points over a structure such as an aircraft wing or large composite component. However applying many individual gauges is both time consuming and adds significant weight to the structure in the form of cabling. Fiber optic sensing techniques make this task easier by combining many sensors on a single fiber. With the FBGS ‘All Grating Fiber’ it is possible to position sensors adjacent to one another, making it possible to monitor changes throughout the complete structure and see how mechanical influences at one point can affect another. The fiber is produced using a process that combines the drawing of the optical fiber with the writing of a Bragg grating. This process of simultaneously drawing the fiber and writing the grating results in spliceless, high strength FBG chains. The fiber coating is applied directly after the grating inscription and as such the commonly used stripping and recoating process of standard FBG’s is not necessary and the pristine fiber strength is maintained throughout the DTG manufacturing process. The ability to build a high density of FBG’s into a single fiber with extremely high mechanical strength compared to conventional gratings, means sensing in harsh environments over large areas with a high resolution of measurement is now possible. With a breaking strength of >5% strain and a temperature operating range from -180°C to +200°C and although originally developed for use in the aerospace industry, the capabilities of the DTG fiber are also suited for structural testing within composites, automotive and the wind industry. FBGS uses a unique method to develop and manufacture its optical sensing fiber. Through this draw tower production process, the position, the wavelength and number of gratings (sensors), can be selected to suit most sensing applications, without special conditions, inflated pricing or extended delivery.

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