Photonic Hydrophones Based on Coated Fiber Bragg Gratings.
Photonic Hydrophones Based on Coated Fiber Bragg Gratings.
Photonic Hydrophones Based on Coated Fiber Bragg Gratings.
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Optoelectr<strong>on</strong>ic Divisi<strong>on</strong>, Engineering Department<br />
ACOUSTICAL PLANE<br />
WAVE<br />
University of Sannio, Benevento (Italy)<br />
WATER<br />
2<br />
1.8<br />
1.6<br />
1.4<br />
1.2<br />
1<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
1546 1546.5 1547 1547.5 1548 1548.5 1549 1549.5 1550<br />
-0.05<br />
1546.5 1547 1547.5 1548 1548.5 1549 1549.5 1550 1550.5 1551 1551.5<br />
FBG<br />
COATING<br />
0.3<br />
0.25<br />
0.2<br />
0.15<br />
0.1<br />
0.05<br />
0<br />
-0.05<br />
1546.5 1547 1547.5 1548 1548.5 1549 1549.5 1550 1550.5 1551 1551.5<br />
SOCIETÀ ITALIANA DI FISICA<br />
XCVIII CONGRESSO NAZIONALE<br />
Napoli, 17-21 Settembre 2012<br />
Dynamic Analysis (Acoustic Wave Detecti<strong>on</strong>)<br />
• COMSOL Multiphysics is used as FEM solver<br />
The 3D geometry is composed by an inner cylinder<br />
(fiber), an outer cylinder (coating) and a sphere<br />
(truncated water domain)<br />
• The acoustical frequency range is 0.5 – 30 kHz<br />
0.3<br />
0.25<br />
0.2<br />
0.15<br />
0.1<br />
0.05<br />
0<br />
The Project Idea<br />
Acoustic wave detecti<strong>on</strong> using coated FBGs<br />
The optical hydroph<strong>on</strong>e is based <strong>on</strong> standard FBG<br />
coated by a ring shaped overlay<br />
y<br />
z<br />
x<br />
h<br />
2*R w<br />
FEM geometry<br />
y<br />
z<br />
x<br />
2*R f<br />
2*R C
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