FIBER OPTIC GRATING MEASURING DEVICE
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United States of America Patent
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Issued Date -
Nov 11, 2010
app pub date -
Sep 22, 2009
filing date -
May 5, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A fiber optic grating measuring device includes a wide-band light source, an optical coupler coupled to the wide-band light source, and an output unit. A long-period fiber grating includes a first end coupled to the optical coupler and a second end coupled to the output unit. A first fiber Bragg grating is coupled to the optical coupler. The first fiber Bragg grating serves as a measuring terminal and is adapted to be mounted on an object having a physical quantity, such as a strain or temperature, to be measured by the fiber optic grating measuring device. A second fiber Bragg grating is coupled to the optical coupler. The second fiber Bragg grating serves as a free terminal and is located adjacent to the first fiber Bragg grating. The second fiber Bragg grating compensates an error resulting from a temperature change to increase the measuring accuracy.
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