Sonardyne UK (Head Office)
T. +44 (0) 1252 872288
F. +44 (0) 1252 876100
E. sales@sonardyne.com
www.sonardyne.com
Datasheet
TZ/OBC Transponder
Description
Designed to work with Sonardyne’s
TZ/OBC acoustic positioning system,
the Type 7815-000-06 transponder
enables the positions of seismic
hydrophone positions to be
accurately and efficiently
determined.
Standard features include a depth
rating of 500 metres, a unique
acoustic ‘address’ enabling
thousands of units to be laid in a
single deployment and automatic
battery voltage monitoring to allow
users to better plan their
maintenance schedules.
Key Features
•
Versatile, low cost transponder
•
Depth rated to 500 Metres
•
Provides fast and efficient
positioning of OBC cables
•
Compact and rugged design
•
HF frequency band from 35-55kHz
•
Alkaline battery packs give up to
18 months listening life
•
Optional RFID tags for asset
tracking
Prior to deployment from a cable lay
boat, the transponders are attached
to the seismic cable at each ground
station, typically every 50 metres.
Once the bottom cable is laid, the
acoustic system measures the ranges
from the surface transceiver to the
transponders to enable their exact
positions to be established. This
positioning process can either be
conducted while laying the cable or
later while shooting.
In OBC operations using a ‘squirter’
cable deployment system,
‘carapaces’ are available that
provide a fast and secure means of
attaching transponders to the cable.
The carapaces are manufactured
from tough plastic that encapsulates
the transponder and optional RFID
asset tracking tag, clamping it
securely to the cable whilst protecting
it from the high cable deployment
and recovery speeds.
The transponders are small and
lightweight and have been proven to
be able to withstand the demanding
and varied operational environment
of OBC and TZ surveys.
The carapace design which is now in
use with many crews around the
world has been proven to be easy to
fit and reduces long term
maintenance when compared with
traditional tie-wrap and tape
methods. The low profile shape of
the carapace also reduces the risk of
snagging and as it is acoustically
‘quieter’ in the water, creates less
noise interference down the cable.
SONARDYNE [ SONARDYNE SOUND IN DEPTH ]
