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The first undersea eruption was detected in June 1993 by the NOAA Vents Program. | The NeMO Net system |
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NeMO
project EOI Program |
New
Millennium Observatory Network |
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The system | ||
The bottom
mooring consists of a camera, lights, temperature sensors, batteries,
acoustic modem, and a master controller.
An
aluminum pressure case with an acrylic lens houses a Sony PAL video camera
and a PC-104 computer with a video frame grabber. On command from the
master controller, one of two 150-watt lights are turned on and the camera
generates an image that is then broken into 64 tiles. Each tile is compressed
by a factor of 35:1 using wavelet theory to yield a complete image of
approximately 16K using an 8 bit gray scale. Temperature is measured at
two places in view of the camera and at one place on the camera frame
with titanium housed PRTs cabled to the master controller. Data are transmitted
from the bottom package at 300 baud with an acoustic modem operating in
the 8-13 kHz range. The bottom system is powered for a one-year deployment
with 564 alkaline D cells. The system was deployed by free-falling the
bottom package and was moved into position with the ROV JASON. A green
laser was mounted on the system to aid in pointing the camera.
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Equipment suppliers | |||
Recognition of the following companies and their products does not constitute an endorsement by the government: Acoustic modems: Datasonics, Inc. Underwater lights:Deep Sea Power and Light: http://www.deepsea.com/ ROV/JASON WHOI http://www.whoi.edu/page.do?pid=7121 |
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Contact
information| Credits US Department of Commerce | NOAA | PMEL | EOI Program Disclaimer |