The NEMO (NEutrino Mediterranean Observatory) Collaboration is constructing, 25 km E from Catania (Sicily) at 2000 m depth, an underwater test site to perform long-term tests of prototypes and new technologies for astrophysical HE neutrino telescopes. In this framework the collaboration deployed an electro-optical cable equipped with several e.o. terminations. An experimental apparatus for the measurement of underwater acoustic background was also installed and connected on 22 Jan 2005, allowing continuous on-line monitoring of deep-sea noise. The station is equipped with 4 hydrophones operational in the range 30 Hz - 40 kHz. This interval of frequencies matches the range suitable for acoustic detection of HE neutrino-induced showers in water. Hydrophones signals are digitized (96 kHz - 24 bits) underwater and continuously transmitted to shore via optical bre. Underwater noise spectra were produced and classication of transient signals is under way. The NEMO-test site is also equipped with an on-line seismic observatory developed by INGV (the Italian National Institute for Geophysics and Volcanology).Published on CDROM and in 10 printed volumes
On-line monitoring of underwater acoustic background at 2000 m depth.
PAVAN, GIANNI;
2005-01-01
Abstract
The NEMO (NEutrino Mediterranean Observatory) Collaboration is constructing, 25 km E from Catania (Sicily) at 2000 m depth, an underwater test site to perform long-term tests of prototypes and new technologies for astrophysical HE neutrino telescopes. In this framework the collaboration deployed an electro-optical cable equipped with several e.o. terminations. An experimental apparatus for the measurement of underwater acoustic background was also installed and connected on 22 Jan 2005, allowing continuous on-line monitoring of deep-sea noise. The station is equipped with 4 hydrophones operational in the range 30 Hz - 40 kHz. This interval of frequencies matches the range suitable for acoustic detection of HE neutrino-induced showers in water. Hydrophones signals are digitized (96 kHz - 24 bits) underwater and continuously transmitted to shore via optical bre. Underwater noise spectra were produced and classication of transient signals is under way. The NEMO-test site is also equipped with an on-line seismic observatory developed by INGV (the Italian National Institute for Geophysics and Volcanology).Published on CDROM and in 10 printed volumesI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
