Sercel VE432 DPG, Инструкция по установке и справочное руководство, Страница: 7 / 52

INTRODUCTION
GENERAL DESCRIPTION
0311385 Issue : April 1999
1-3
• •
Enhanced real-time Quality Control
The DSD integrates a complete set of functions for automatic sensor tests. The check
for coherence between all the measurements contributes to quality assurance,
ensuring that the vibrator generates the proper sweep, without any risk of polarity
inversion.
A complete QC data base is generated for real-time or post-processing analysis
including :
- phase
- distortion
- fundamental ground force
In addition, the digital control identifies the ground viscosity and stiffness, which
regularly provides information on the ground absorption model and can be used to
enhance seismic data.
Real-time phase, distortion, fundamental ground force values versus time or
frequency, for each vibrator and each sweep, are available on request.
• • Bar-graph QC display
All the QC information is displayed within color bar-graphs with automatic threshold
detection. For each vibrator, current values and average values over the last 50
vibrations are shown.
• •
Complete graphic display
In addition to the QC data base information, the VE 432 has the capability to
graphically display in real time, the Phase, Distortion and Force results vs. Time or
Frequency, for each vibrator.
• • QC Statistics
On request, statistics on QC data base can be performed, for daily or longer time
period analysis, to detect any drift in vibrator performance or to be used as a
preventive maintenance tool.
• •
Slip-Sweep* capability
With a recording system from SERCEL, there is no need to wait until a sweep is
complete to start the next one. (* The Slip-sweep technique, developed by PDO,
allows substantial production increase to be achieved).