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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Sensitivity Gain [dB]<br />
70<br />
60<br />
50<br />
40<br />
30<br />
20<br />
Optoelectr<strong>on</strong>ic Divisi<strong>on</strong>, Engineering Department<br />
University of Sannio, Benevento (Italy)<br />
Sensor Performances<br />
D-5<br />
D-10<br />
A-5<br />
5 10 15 20 25 30 35<br />
Frequency [kHz]<br />
Sensitivity [dB re Volt/ Pa]<br />
-180<br />
-190<br />
-200<br />
-210<br />
-220<br />
-230<br />
SOCIETÀ ITALIANA DI FISICA<br />
XCVIII CONGRESSO NAZIONALE<br />
Napoli, 17-21 Settembre 2012<br />
D-5<br />
D-10<br />
A-5<br />
PZT<br />
5 10 15 20 25 30 35<br />
Frequency [kHz]<br />
• Sensors with Damival coating are more sensitive than PZT in the frequency range 4-20kHz<br />
• Sensors with Araldite coating are more sensitive than PZT in the frequency range 15-35kHz<br />
• Sensitivity improvement with respect to bare FBG of 2-3 order of magnitude<br />
• Sensitivity comparable or higher than traditi<strong>on</strong>al PZT and other phot<strong>on</strong>ic technologies at the state of the art<br />
• Resoluti<strong>on</strong>: about 10mPa/(Hz) 1/2 at the res<strong>on</strong>ances -It depends also <strong>on</strong> the interrogati<strong>on</strong> strategy. It can be improved-<br />
• Frequency selectivity is desired in active sensing applicati<strong>on</strong>s<br />
whereas flatness is typically required in passive sensing applicati<strong>on</strong>s
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