Comments: download file (cintal_rep).
Ref.: SiPLAB Report 03/22, SiPLAB, CINTAL, University of Algarve, October 2022.
Abstract
The AZORES'22 sea trial took place from May 19 to June 24, 2022, in the proximity
of the shallow channel between Faial and Pico Islands in the Azores. Three moorings
were deployed : two on the southern approaches to the channel and one in the northern
side. Each mooring had two recorders: one EAR and one SR1 or M35 vector hydrophone.
After recovery several technical issues were noticed both with the SR1 and M35 recorders
provided by UALg and with the EARs provided by IMAR. Based on a small set of 8 hours
of data overlap between EAR-SR1 recording in the same mooring, preliminary analysis
shows that there is a significant difference between EAR and SR1 outputs, both in level
over the whole band up to 25 kHz, and in the low frequency band below 300 Hz. In that
band, which is very relevant for shipping noise analysis, the EAR output is progressively
attenuated as the frequency decreases down to approximately 20 Hz. The objectives of
the sea trial were only partially met due to equipment failure, which sets requirements of
further equipment testing and maintenance in the preparation of future trials.