Sub-bottom Profilers

HMS-620 Bubble Gun Seismic Systems

Portable, Low Frequency, Acoustic Sub - Bottom Seismic Systems

The HMS-620 Bubble GunTM systems use low-frequency acoustic signals to provide superior signal penetration vertically through coarse sand, gravel tills, and other difficult-to-penetrate sediments. HMS-620 Single Source  Ideal for Small Boat or Inland Surveys HMS-620D Dual Source  Higher Source Level, Greater Penetration HMS-620LF Low Frequency Source  Wide 20 – 1700 Hz Energy Spectrum  Ideal for Multi-Channel Reflection Surveys

Falmouth Scientific, Inc.

Pocasset, US

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Description

APPLICATIONS
 Offshore Wind Turbine and Dam Site Surveys
 Cross River Surveys for Bridge Construction
 Bedrock Investigation
 Pipeline Construction Surveys
 Geotechnical Site Investigation
 Coastal Engineering
 Shallow Gas Hazard Surveys

FEATURES/BENEFITS
Falmouth Scientific, Inc.
www.falmouth.com
HMS-620LF Low Frequency Bubble GunTM Source Vehicle
 Single and Dual Source Systems do not need heavy handling or deployment equipment
 Wide-band 70 - 1700Hz pulse provides bottom penetration through many sediment types
 LF System Source Bandwidth 20Hz – 1700Hz
 Very stable and repeatable source pulse without the need for external timing controllers
 Rugged, lightweight transducer platform provides stable operation in adverse sea-state conditions
o Electromagnetic acoustic source; Contained Air Volume (no air compressor needed)
 Minimal Electric Power Requirements
o Selectable 110 or 220 VAC source of less than 1 KWatt for Single Source, or 2 KWatt for Dual or LF Source
 Flexible portable transceiver unit optimizes system for a wide range of sediments
o Low-noise pre-amp with high/low pass filters and gain control
o User-selectable trigger or external trigger
o Multiple Sources can be synchronized to a common trigger without need for external timing control
o Repeatable Shot-to-Shot Phase and Amplitude Wavelet Correlation > 0.96
 Oil-filled single channel hydrophone streamer cable incorporates a 7-meter multi-element active section
o 35-meter deactivation switches on each hydrophone element enable exportation outside of USA
 Compatible with industry-standard data acquisition software & multi-channel streamers

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Specifications

Mode of operation: Platform type

Signal composition

Broadband

Frequency

Min. depth of operation [m]

1

Max. depth of operation [m]

1500

Min. frequency [Hz]

20

Max. frequency [Hz]

2000

Power output [W]

214dB

Max. resolution [m]

.25

Max. penetration [m]

700

Max. pulse rate [Hz]

4

Max. pulse length [s]

0.004

General: Product type

Seimic Source, Sub-Bottom Profiler, Bubble Gun, Acoustic Source

Components to be used in combination with product

HMS-620, HMS-622

Year of initial development

2013

Application

High Resolution

Max power consumption [W]

2000

Power type

AC

Transducer weight [kg]

30

Transducer length [m]

0.5

Transducer width [m]

0.5

Transducer height [m]

0.09

Weight of logging unit [kg]

30

Portability of logger

Portable

Power requirements

2000W

Operating temperature: max. [°C]

65

Operating temperature: min. [°C]

-20