What we are doing for Deep-Sea and Seafloor Observatory Science
Envirtech Vulcan Class
First step in oceanic environment evaluation is to collect and monitor physical parameters, like sea temperature, waves heave and direction, current speed and so on. Many real-time, climatical buoy networks were implemented in the last 10 years as well as deep ocean seafloor observatories.
The ocean exerts a pervasive influence on earth's environment. It is therefore important that we learn how this system operates.
Classical methods of observing the ocean fail to fit the sampling requirements that are naturally imposed by the temporal and spatial scales of these phenomena.
They also fail to provide proper tools to detect the onset and monitoring of episodic events (e.g. eruptions, earthquakes and tsunami). To address the scientific issues listed above, long time-series measurements of critical biological, geological, chemical and physical parameters are needed. This calls for the deployment of networks of seabed, moored and mobile sensor suites, as well as access to equipment and facilities for scientific data processing and analysis. This can only be addressed by establishing continuous long-term observing capabilities with the capacity for bidirectional telemetry.
The maintenance of a realtime data stream from the observatory to shore, and the ability to control instruments within the observatory from shore, will have a revolutionary impact on our understanding of steady-state, periodic and transient events.
Long-term operations require in situ power sources, through e.g. diesel or fuel cell generators moored for long periods at the sea surface, deployed on the sea bottom or provided by cable from shore. There are other technological challenges, requiring the use and further development of acoustic tracking and data communication systems, fixed seabed stations with high precision and reliable scientific instrumentation, remotely operated vehicles (ROVs), and autonomous marine vehicles (AMVs) equipped with dedicated scientific sensor suites.A generation of sensors must be developed capable of sustained operations in deep sea conditions.
3-axys - Low noise - embedded inclinometer
Frequency range: 0.0027 Hz to 50 Hz
Linearity >100 dB
Dynamic range >140 dB
Sensor axys orthogonal within 0.1°
24 bit digitizer
High precision and stability Real time clock
Self Levelling platform installation
Bandwidth up to 2 KHz
ARM Processor 16 bit
Ram 1024 Kb
Very low power consumption
Spread Spectrum Acoustic Modem
Acoustic link 8,500 bps
Operating Frequency: 12.75 to 21.25 KHz
Magneto inductive link