High force measurement sensitivity with fiber Bragg gratings fabricated in uniform-waist fiber tapers

Fiber Bragg gratings inscribed in the waist of tapered photosensitive fibers offer specific attractive properties for sensing applications. A small-diameter fiber reduces structural influences for imbedded fiber sensing elements. In the case of application as a force-sensing element for tensile forces, sensitivity scales inversely with the fiber cross-sectional area. It is therefore possible to increase force sensitivity by several orders of magnitude compared to Bragg grating sensors in conventionally sized fibers. Special requirements for such Bragg grating arrangements are discussed and experimental measurements for different fiber taper diameters down to 4 µm are presented.

[1]  Peter Kratzer,et al.  Strain calibration of optical FBG-based strain sensors , 2010, European Workshop on Optical Fibre Sensors.

[2]  G. Brambilla,et al.  Enhanced photosensitivity in germanosilicate fibers exposed to CO2 laser radiation. , 1999, Optics letters.

[3]  Orlando Frazão,et al.  Chirped Bragg grating fabricated in fused fibre taper for strain–temperature discrimination , 2005 .

[4]  Kyriacos Kalli,et al.  Fiber Bragg Gratings: Fundamentals and Applications in Telecommunications and Sensing , 2000 .

[5]  P. Pérez-Millán,et al.  Temperature sensor based on the power reflected by a Bragg grating in a tapered fiber. , 2004, Applied optics.

[6]  Christoph Chojetzki,et al.  High-mechanical-strength single-pulse draw tower gratings , 2004, Photonics North.

[7]  Jose L. Cruz,et al.  Fast response vibration sensor based on Bragg gratings written in tapered core fibres , 2007 .

[8]  Yu-Lung Lo,et al.  Investigation of strain transmission of surface-bonded FBGs used as strain sensors , 2009 .

[9]  Wolfgang Ecke,et al.  A fibre Bragg grating sensor system monitors operational load in a wind turbine rotor blade , 2006 .

[10]  S Sakaguchi,et al.  Optical properties of GeO2 glass and optical fibers. , 1997, Applied optics.

[11]  Orlando Frazão,et al.  Strain sensitivity control of fiber Bragg grating structures with fused tapers. , 2007, Applied optics.

[12]  Naohiro Soga,et al.  Pressure Derivatives of the Elastic Constants of Vitreous Germania at 25°, −78.5°, and −195.8°C , 1969 .

[13]  Ines Latka,et al.  Fibre optic sensor network for spacecraft health monitoring , 2001 .