Seismic Source and Receiver:
Geopulse Boomer Plate (left) mounted on Huntec Catamaran (right)
Specifications for the Geopulse Boomer Plate:
(for more information, see Geoacoustics
Ltd.)
Source Level: 227 dB re 1µP @ 1m at 280 joules
Pulse Length: <0.2 msec
Max input Energy: 280 joules
Max input Voltage: 4kV
Weight: 12.5 kg
Dimensions: 38.3 cm (W) x 41.5 cm (D) x 4.3 cm (H)
|
 Krontron
IP Lite Windows 95 based Pentium machine
Saves boomer data
via NFS network interface or on an Iomega Jaz subsystem
Current configuration
will accept up to 2 channels of data asynchronously
Serial I/O ports
(i.e., for navigation)
Parallel (Centronics)
ports for printing on Oyo plotter
DELPH2X-AU32 board
with 2 input channels using 16-bit Delta-Sigma converters
Overview of the system:
The DELPH2X system is based on signal acquisition and processing boards
inserted in an IBM-PC-type computer operating under WINDOWS95 or WINDOWS
NT. Acquisition and processing are carried out using the DELPH2X-AU32
dedicated board, with 2 input channels.
The AU32 board has two input channels in the 0-20 kHz frequency bandwidth
with simultaneous sampling. The converters used are 16-bit Delta-Sigma
converters with built-in anti-aliasing filters whose cutoff frequency
follows the sampling frequency. The maximum input noise level is 3 µV
rms between 100 Hz and 20 kHz. Distortion is 0.01%. The AU32 board has
a full 70 dB amplification chain allowing input levels to be programmed
from 1 millivolt 0-peak to 5 volt 0-peak at full scale. Input connecting
cables are SMB subclick coaxial cables.
Each AU32 board has two independent output channels in the 0-20 kHz frequency
band. The converters used are 16-bit Delta-Sigma converters with built-in
anti-aliasing filters. A micro-switch for each channel, placed on the
back panel, enables selection of the type of output, either 10 dBV maximum
over 600 ohms, or 10 dBV maximum over 50 ohms.
|
