Optical strain gauge comprising a fiber Bragg grating
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United States of America Patent
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Mar 26, 2013
Grant Date -
Oct 18, 2012
app pub date -
Apr 22, 2010
filing date -
Apr 22, 2009
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Abstract
The invention relates to an optical strain gauge using a glass fiber (1) comprising a Bragg grating (2). The glass fiber is coated with a sheath (3) of polyether ether ketone with an admixture of at least 10 weight percent and a maximum of 40 weight percent of an inorganic filler, with a particle size of between 0.08 μm and 12 μm. The outer diameter of the sheath (3) is between 0.2 mm and 1.2 mm. The ratio D/d between the outer diameter D of the sheath (3) and the diameter d of the glass fiber (1) is between 2 and 6. A pressure of the sheath (3) on the glass fiber (1) is such that essentially no relative movement can occur between the glass fiber (1) and the sheath (3).
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