Photonic Hydrophones Based on Coated Fiber Bragg Gratings.
Photonic Hydrophones Based on Coated Fiber Bragg Gratings. Photonic Hydrophones Based on Coated Fiber Bragg Gratings.
Sensitivity Gain [dB] Sensitivity Gain [dB] 120 100 120 100 80 60 40 80 60 Sensitivity Gain [dB] 120 100 80 60 Optoelectronic Division, Engineering Department University of Sannio, Benevento (Italy) R /R C R = 20 C f /R = 20 f 40 0 3 6 9 12 15 18 21 24 27 30 100 40 0 3 6 9 Frequency [kHz] 12 15 18 21 24 27 30 Frequency [kHz] 80 E=78 MPa 20 0 3 6 E=970 MPa data3 9 12 15 18 21 Frequency data4 [kHz] data5 24 27 30 SOCIETÀ ITALIANA DI FISICA XCVIII CONGRESSO NAZIONALE Numerical Results: Parametric Analysis Cylinder height Cylinder data6 radius Napoli, 17-21 Settembre 2012 20 0 3 6 9 12 15 18 21 24 27 30 Frequency [kHz] Elastic data6 modulus Poisson ratio Damping data7 h= 4cm h= 1cm data3 data4 data5 Sensitivity Gain [dB] 120 60 40 110 20 0 3 100 100 6 9 12 15 18 21 24 27 30 90 Frequency [kHz] Sensitivity Gain [dB] Sensitivity Gain [dB] Sensitivity Gain [dB] 120 100 80 80 70 60 60 50 80 60 40 h= 4 cm R C /R f =10 R C /R f =20 h= 4 cm 20 data3 0 3 6 9 12 15 18 21 24 27 30 data4 Frequency [kHz] data5 data7 h= 4cm ; R /R =20 C f n = 0.3 n = 0.4 data3 data4 data5 data6 data7 40 40 0 3 6 9 12 15 18 21 24 27 30 12 15 18 21 24 27 30 Frequency [kHz] Frequency [kHz] Sensitivity Gain [dB] By acting on the geometrical size and elastic properties, it is possible to design and tailor the sensor performance for a specific application 120 100 80 60 40 h= 4cm ; R C /R f =20 undamped =0.1
Optoelectronic Division, Engineering Department University of Sannio, Benevento (Italy) DAMIVAL 13650 Thermosetting polyurethane resin E= 200 MPa n=0.4 r=1180 kg/m 3 =0.1 Sensor Design SOCIETÀ ITALIANA DI FISICA XCVIII CONGRESSO NAZIONALE Napoli, 17-21 Settembre 2012 Project “ASSO” defines among the needs and requirements two operating frequency ranges for the underwater acoustic sensors: a “low” frequency range 0-15 kHz and a “high” frequency range 15-30 kHz Sensitivity Gain [dB] 70 60 50 40 30 20 10 h=4cm; h = 4 cm D; RC=5mm = 5 mm C 0 0 5 10 15 20 25 30 35 Frequency [kHz] Sensitivity Gain [dB] 70 60 50 40 30 20 10 ARALDITE DBF Epoxy adhesive resin h=4cm; h = 4 cm D; C=5mm R = 5 mm C E= 2.9 GPa n=0.345 r=1100 kg/m 3 =0.02 0 0 5 10 15 20 25 30 35 Frequency [kHz]
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Sensitivity Gain [dB]<br />
Sensitivity Gain [dB]<br />
120<br />
100<br />
120<br />
100<br />
80<br />
60<br />
40<br />
80<br />
60<br />
Sensitivity Gain [dB]<br />
120<br />
100<br />
80<br />
60<br />
Optoelectr<strong>on</strong>ic Divisi<strong>on</strong>, Engineering Department<br />
University of Sannio, Benevento (Italy)<br />
R /R<br />
C R = 20<br />
C f /R = 20<br />
f<br />
40<br />
0 3 6 9 12 15 18 21 24 27 30 100<br />
40<br />
0 3 6 9<br />
Frequency [kHz]<br />
12 15 18 21 24 27 30<br />
Frequency [kHz]<br />
80<br />
E=78 MPa<br />
20<br />
0 3 6<br />
E=970 MPa<br />
data3<br />
9 12 15 18 21<br />
Frequency data4 [kHz]<br />
data5<br />
24 27 30<br />
SOCIETÀ ITALIANA DI FISICA<br />
XCVIII CONGRESSO NAZIONALE<br />
Numerical Results: Parametric Analysis<br />
Cylinder height Cylinder data6 radius<br />
Napoli, 17-21 Settembre 2012<br />
20<br />
0 3 6 9 12 15 18 21 24 27 30<br />
Frequency [kHz]<br />
Elastic data6 modulus Poiss<strong>on</strong> ratio Damping<br />
data7<br />
h= 4cm<br />
h= 1cm<br />
data3<br />
data4<br />
data5<br />
Sensitivity Gain [dB]<br />
120<br />
60<br />
40<br />
110<br />
20<br />
0 3<br />
100<br />
100<br />
6 9 12 15 18 21 24 27 30<br />
90 Frequency [kHz]<br />
Sensitivity Gain [dB]<br />
Sensitivity Gain [dB]<br />
Sensitivity Gain [dB]<br />
120<br />
100<br />
80<br />
80<br />
70<br />
60<br />
60<br />
50<br />
80<br />
60<br />
40<br />
h= 4 cm<br />
R C /R f =10<br />
R C /R f =20<br />
h= 4 cm<br />
20<br />
data3<br />
0 3 6 9 12 15 18 21 24 27 30<br />
data4<br />
Frequency [kHz]<br />
data5<br />
data7 h= 4cm ; R /R =20<br />
C f<br />
n = 0.3<br />
n = 0.4<br />
data3<br />
data4<br />
data5<br />
data6<br />
data7<br />
40<br />
40 0 3 6 9 12 15 18 21 24 27 30<br />
12 15 18 21 24 27 30<br />
Frequency [kHz]<br />
Frequency [kHz]<br />
Sensitivity Gain [dB]<br />
By acting <strong>on</strong> the geometrical size and<br />
elastic properties, it is possible to<br />
design and tailor the sensor<br />
performance for a specific applicati<strong>on</strong><br />
120<br />
100<br />
80<br />
60<br />
40<br />
h= 4cm ; R C /R f =20<br />
undamped<br />
=0.1
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