| Presentation | 2011-03-04 Circular ring diameter change measurement by Brillouin gain spectrum observation Tomoaki HATTORI, Hiroshi NRUSE, Takanori NISHINO, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper presents a method for measuring the change in diameter of a circular ring to which an external force is applied from its diametrical direction, by the observing Brillouin gain spectrum (BGS) produced in an optical fiber bonded to its surface. The function that gives the BGS shape by deformation from the diametrical force on the circular ring is formulated based on (i) the relationship between a non-uniform strain distribution produced in the circular ring under the diametrical force and the diameter change using elastic analysis, (ii) the strain dependence of the BGS frequency shift, and (iii) the BGS observation position and section length. The diameter change is obtained by minimizing the residual error sum of squares between observed BGSs and those calculated by the function. Results from diameter change measurement experiments using a circular ring with a diameter of ca. 2 m confirmed that the observed BGS shape is in good agreement with that calculated by the function. The error for the diameter change measurement was less than 0.7 mm. The rate of diameter change with applied force is assumed to be low up to a diameter change of 1 %, followed by a significant increase above 1 %, as previously reported. Therefore, the measurement error in the range up to 1 % diameter change for a ca. 2m circular ring is 3.5 %. These results show the validity of the BGS shape analysis and the effectiveness of this method. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Optical fiber sensing / non-uniform strain distribution / Brillouin gain spectrum / circular ring / diameter change measurement |
| Paper # | OFT2010-68,OPE2010-172 |
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| Conference Information | |
| Committee | OFT |
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| Conference Date | 2011/2/25(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Optical Fiber Technology (OFT) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Circular ring diameter change measurement by Brillouin gain spectrum observation |
| Sub Title (in English) | |
| Keyword(1) | Optical fiber sensing |
| Keyword(2) | non-uniform strain distribution |
| Keyword(3) | Brillouin gain spectrum |
| Keyword(4) | circular ring |
| Keyword(5) | diameter change measurement |
| 1st Author's Name | Tomoaki HATTORI |
| 1st Author's Affiliation | Graduate School of Engineering, Mie University() |
| 2nd Author's Name | Hiroshi NRUSE |
| 2nd Author's Affiliation | Graduate School of Engineering, Mie University |
| 3rd Author's Name | Takanori NISHINO |
| 3rd Author's Affiliation | Graduate School of Engineering, Mie University |
| Date | 2011-03-04 |
| Paper # | OFT2010-68,OPE2010-172 |
| Volume (vol) | vol.110 |
| Number (no) | 436 |
| Page | pp.pp.- |
| #Pages | 4 |
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