Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1536849 | Optics Communications | 2012 | 4 Pages |
In this paper, two hybrid multimode/single mode fiber Fabry–Pérot (FP) cavities were compared. The cavities fabricated by chemical etching are presented as high temperature and strain sensors. In order to produce this FP cavity a single mode fiber was spliced to a graded index multimode fiber with 62.5 μm core diameter. The Fabry–Pérot cavities were tested as a high temperature sensor in the range between room temperature and 700 °C and as strain sensors. A reversible shift of the interferometric peaks with temperature allowed to estimate a sensitivity of 0.75 ± 0.03 pm/°C and 0.98 ± 0.04 pm/°C for the sensor A and B respectively. For strain measurement sensor A demonstrated a sensitivity of 1.85 ± 0.07 pm/μƐ and sensor B showed a sensitivity of 3.14 ± 0.05 pm/μƐ. The sensors demonstrated the feasibility of low cost fiber optic sensors for high temperature and strain.