2011
DOI: 10.1088/0957-0233/22/7/075201
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High force measurement sensitivity with fiber Bragg gratings fabricated in uniform-waist fiber tapers

Abstract: 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 f… Show more

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Cited by 52 publications
(35 citation statements)
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References 13 publications
(15 reference statements)
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“…This is in agreement with experimental results [25,26]. SCMG sensors can also be characterized by their force sensitivity (SF)…”
Section: Strain/forcesupporting
confidence: 92%
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“…This is in agreement with experimental results [25,26]. SCMG sensors can also be characterized by their force sensitivity (SF)…”
Section: Strain/forcesupporting
confidence: 92%
“…(9). A SCMG with diameter of 3.5 µm reaches a force sensitivity of ~ 1900 nm/N, which is more than three orders of magnitude compared to that of a conventional fibers [26]. If the Bragg wavelength can be detected to an accuracy of 0.05 nm, forces in the order of 10 -5 N can be measured.…”
Section: Strain/force Sensingmentioning
confidence: 99%
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“…This is likely due to the fact that typical ST forces are in the 10 −3 N range, i.e., much too small to be detectable by optical fiber force sensors with a Young's modulus above 70 GPa (for silica fibers) [11][12][13]. A possible method to overcome this drawback would be to reduce the fiber diameter to increase the force sensitivity, such as in microfiber Bragg gratings [14][15][16] and microfiber-based asymmetrical Fabry-Perot interferometers [17]. However, one problem is that reducing the fiber diameter makes the sensors easy to break; another problem is that such force sensors [14][15][16][17] are not designed to measure lateral forces, but rather axial ones.…”
mentioning
confidence: 99%
“…A possible method to overcome this drawback would be to reduce the fiber diameter to increase the force sensitivity, such as in microfiber Bragg gratings [14][15][16] and microfiber-based asymmetrical Fabry-Perot interferometers [17]. However, one problem is that reducing the fiber diameter makes the sensors easy to break; another problem is that such force sensors [14][15][16][17] are not designed to measure lateral forces, but rather axial ones. On the other hand, there is no way to measure the ST of an unknown liquid (just knowing the liquid's refractive index (RI) in the range of 1.33-1.43, for instance) by using the water as a reference.…”
mentioning
confidence: 99%