Multi-channel Hydrophone Streamers
Analog and Digital
SIG multi-channel streamers are dedicated to UHR seismic. The active sections are configurated with 4 to 24 channels in the analog version, and 48 channels in the digital version. Group spacing varies from 1 to 12.5m. The SIG 16 streamers do not require a French export license. Depending on the customers' requirements, the streamers can also integrate other hydrophones of the market.
Description
The MCsps deck unit interfaces the analog multi-channel streamer to any third party recording system, and provides the power for the preamplifier, and also provides high quality analogue frequency filters and selectable gains.
Nine amplification gains can be selected : 0 dB, 2 dB, 4 dB, 6 dB, 8 dB, 10 dB, 12 dB, 14 dB and 16 dB. This amplification is added to the 36 dB amplification fixed inside the
section. The low cut-off frequency can be selected between 3 Hz, 25 Hz, 50 Hz and 100 Hz.
The signal generated by each group of hydrophones is pre-amplified, either at the head of the section in a cartridge, easy to plug into the head piece and easy to replace, or at each group, inserted inside the section. An integrated band-pass filter cuts off undesirable high frequencies and disturbances from the DC component. Bandwidth to be defined according to the customers global system.
Specifications
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General
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Year of initial development
2017
Year of latest version
2019
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Physical Properties
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Streamer length [m]
346
Group Spacing [m]
2.5
Group length [m]
1.5
Hydrophones per group
4
Deck lead/lead in [m]
75
Tow lead [m]
250
Total active length [m]
60
Elastic sections [m]
18
Active sections [m]
96
Tail stretch [m]
18
Minimum bend radius [m]
0.4
Buoyancy [N]
1.02
Operation depth [m]
5
Breaking strength [daN]
2000
Jacket material
PU
Ballast fluid
mineral oil
Type of streamer
analogue
Voltage to streamer [V]
30
Type of Connectors
depending on data acquisition system
Streamer Diameter
44
Number of channels
24
Type of filling
Oil
Hydros Spacing
0.5
-
Pre-amp
-
Pre-amp coupled
Yes
Size
diam. 2 mm /L. 6mm
Voltage [V]
30
High- pass
5 Hz
Low- pass
2 kHz
Type of Pre-amp
Current [mA]
0.2
Gain [dB]
36
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Recording system
-
Manufacturer
compatible with IxBlue Deph Seismic
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Energy source or seismic guns
-
Manufacturer
compatible with any air gun or sparker
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Hydrophones
-
Frequency spectrum
10-1800Hz
Type of hydrophones
SIG 16 - acceleration cancelling
Sensitivity [dB re 1μPa/Hz]
183
Type / Brand
SIG
Acceleration compensation
Yes
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Tow cable
-
Length [m]
250
Diameter [mm]
16
Insulation
PU
Termination
Amphenol 62GB