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Datasheet
SIPS CT Sensor (Discontinued)
Description
The Type 7889 SIPS CT sensor has
been designed in response to
industry requests for continuous on-
line monitoring of velocity at normal
streamer depth.
shots, the normal alkaline battery
pack will last a minimum of 90 days.
Battery power consumed and current
pack voltage are monitored and
reported to the SIPS Processor.
Key Features
•
Provides accurate sound velocity
reading
•
90 day battery life with 1 reading
every 2 minutes
•
Accurate to 0.5m/s
•
Data output combined with SIPS
and/or separate RS232
•
Integrated communications with
SIPS on bird lines
•
Mechanics based on SIPS2 XSRS
units
•
Depth rated to 150 Metres
Velocity is calculated from
conductivity and temperature
measurements and may be used
directly by the main navigation
computer. Although measurements
are taken in a plane the resultant
velocity may be used to indicate that
a full water column sample may be
required to correct the seismic data.
The Velocimeter is based on SIPS 2
mechanics but versions are fully
compatible with earlier SIPS 1
systems.
Parameters are set up as part of the
normal SIPS 2 User Interface and are
then integrated with the normal
acoustic data acquisition cycle.
Current velocity is reported on screen
and output with the acoustic data.
Internally, the velocity may be used
as an input to the “Genie”
adjustment engine which is used to
optimise overall acoustic
performance.
The unit incorporates an F.S.I. digital
conductivity and temperature sensor
and conversions to sound velocity
are calculated according to the Chen
and Millero 1977 algorithm.
Depending on the nature of the
survey environment, velocity readings
can be obtained at every shot point
or at chosen intervals up to one
reading every 256th shot point. In
practise, assuming an interval of 10
seconds and a reading every 12
On SIPS 1 systems, the unit’s set-up
parameters are input to the SIPS
Processor via the PC based WINSIPS
programme. In either case, velocity
may also be set to be output over a
dedicated RS232 port and may be
read by any suitable communications
software package (PROCOMM+) As
an option, the unit may be
programmed to also report
conductivity and temperature as raw
data. This enables independent
calculation and verification of
velocity to be made.
SONARDYNE [ SONARDYNE SOUND IN DEPTH ]
