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 />
University of Sannio, Benevento (Italy)<br />
2<br />
<br />
1 neff<br />
S <br />
z 11 x 12 z y<br />
P0<br />
P0<br />
<br />
2<br />
SOCIETÀ ITALIANA DI FISICA<br />
XCVIII CONGRESSO NAZIONALE<br />
Numerical Results: Res<strong>on</strong>ant Behavior<br />
p p <br />
<br />
Pressure distributi<strong>on</strong> in water and<br />
z-strain distributi<strong>on</strong> <strong>on</strong> the cylinder surface<br />
(i.e. @ 20kHz)<br />
Sensitivity Gain [dB]<br />
120<br />
100<br />
80<br />
60<br />
40<br />
<br />
<br />
<br />
Sensitivity Gain 20*<br />
log<br />
<br />
<br />
E= 78 MPa<br />
n=0.3<br />
Sensitivity gain<br />
h= 4 cm ; R C /R f = 20<br />
20<br />
0 3 6 9 12 15 18 21 24 27 30<br />
Frequency [kHz]<br />
Napoli, 17-21 Settembre 2012<br />
The coated FBG resp<strong>on</strong>ds to the impinging acoustic plane wave through a mechanical deformati<strong>on</strong>.<br />
The resulting strain at the FBG locati<strong>on</strong> determines a <strong>Bragg</strong> wavelength shift<br />
Res<strong>on</strong>ances are associated to res<strong>on</strong>ant l<strong>on</strong>gitudinal modes of the cylindrical hydroph<strong>on</strong>es<br />
S<br />
SBARE<br />
<br />
<br />
<br />
<br />
5.7 kHz<br />
SBARE<br />
10.8 kHz 18.7 kHz<br />
15 kHz<br />
-6 -1<br />
-2.7610<br />
MPa<br />
Res<strong>on</strong>ant modes<br />
AWARD: Optical <strong>Fiber</strong> Sensors 21, Ottawa (Canada) M.Moccia et al., Opt. Express 19 (20), 2011<br />
21.9 kHz<br />
25 kHz<br />
27.9 kHz
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