Table T1. Glossary of the NEREID-191 system.
|
Term
|
Definition
|
|---|---|
| BIA | Borehole instrument assembly, commonly known as the Christmas tree. |
| CRM | Combiner/repeater module. This is a part of the MEG-191. |
| DL | Data logger for the PCS in the SWB. It records the condition of the SWB system and is recovered by an ROV or submersible. |
| DM24 | Digitizer module consisting of a 24-bit analog-to-digital converter and microprocessor. |
| GCF | Guralp Compressed Format, used for data transmission and receiving on an RS232C serial line. |
| MEG-191 | Multiple-access expandable gateway, commonly known as the G-box. It serves as the control unit for power, signal, and timing. |
| OBH | Ocean borehole seismometer. Modified version of the feedback-type broadband seismometer (Type CMG-1T) made by Guralp Ltd., United Kingdom. |
| PAT | Power supply access terminal, commonly called the battery frame. It contains the SWB system and SAM-191 and also serves as an ROV or submersible platform. |
| PDM | Power conditioning/distribution module contained in the MEG-191. |
| PCS | Power control system. This monitors the condition and control output of the SWB system. |
| PCB | Printed circuit board. |
| ROV | Remotely operated vehicle. |
| RTM | Real-time module, contained in the CRM. |
| SAM-191 | Storage acquisition module. This is a seismic data recorder that can be recovered by an ROV or submersible. |
| SWB | Seawater battery system, developed by Kongberg Simrad Ltd., Norway, consisting of cells, a DC/DC converter, the PCS, an accumulator, and the DL. |
| UMC | Underwater mateable connector, produced by Ocean Design Inc., U.S.A. |