| Description |
ix, 38 leaves : illustrations ; 28 cm |
| Summary |
"Long period fiber gratings (LPFGs) have found many applications as sensors to measure strain, temperature, refractive index and other physical parameters. In various sensing applications, the cross-sensitivity between two parameters, especially the temperature cross-sensitivity, has been a major difficulty to achieve high accuracy measurement. One of the solutions is to develop LPFG sensors for simultaneous, multi-parameter measurements. In this thesis, three-section phase-shift (PS) LPFGs were fabricated and investigated for simultaneous measurement of temperature and strain. Compared with a two-section PS-LPFG, a three-section PS-LPFG has two deeper resonance sub bands and a larger separation between the two bands. The strain, temperature and refractive index sensitivities of the two resonance sub bands are independent and significantly different. As such, it has the potential for measurement of two parameters simultaneously. We fabricated high-quality three-section PS-LPFGs using CO₂ laser point-by-point radiations, characterized and calibrated the strain and temperature sensitivities of the two resonance sub bands, and for the first time to our knowledge demonstrated its effectiveness for simultaneous measurement of temperature and strain"--Abstract, leaf iii. |
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