Abalone OBS
The Abalone OBS was originally designed by SIO.
Item | Specifications |
|---|---|
| Physical Attributes | Syntactic foam floatation in roto-molded frame. Two 7075-T6 aluminum pressure housings holding: (i) 4.375” ID / 5.25” OD x 19.25” - data-logger; (ii) 4.375” ID / 5.25” OD x 42” lithium batteries. Acoustic release in 4” ID / 4.75” OD x 18.5“ 7075-T6 aluminum housing. Air weight is with/without anchor is 826 lbs/452 lbs. |
| Data Logger | Nanometrics 4-channel 24-bit data-logger with built-in Seascan clock, and128 GByte embedded MultiMedia Card (eMMC). |
| Clock | Seascan low-power, digitally-temperature-compensated (DTCXO), clock with drift rate, before end-point correction, of <5 ms/day. |
| Sensors | Nanometrics Trillium Compact OBS 3-axis seismometer with a velocity response that is flat from 120 s to 50 Hz. When deployed, the seismometer package is shielded beneath the roto-molded frame and is mechanically decoupled from motion of the OBS frame. Seismometer package has a water weight of 24.5 lb. Differential Pressure Gauge (DPG) long-period pressure sensor. |
| Recording Duration | Lithium battery pack for ~15 months recording at 100 Hz. Separate keep-alive battery for clock. |
| Operation | Operated in closed-housing mode. |