FSI - Model HMS-620 LF -Portable Low-Frequency Acoustic Seismic Bubble Gun System

• Surveys that need high shot-to-shot wavelet correlation
• Shallow Gas Hazard Surveys
• Offshore Wind Turbine and Dam Site Surveys
• Cross River Surveys for Bridge Construction
• Bedrock Investigation
• Pipeline Construction Surveys
• Geotechnical Site Investigation
• Coastal Engineering

• Wide-band 20-1700Hz pulse provides bottom penetration through many sediment types
• Peak-to-Peak Amplitude of 1 bar-m
• Very stable and repeatable source pulse without the need for external timing controllers
• Rugged transducer platform provides stable operation in adverse sea-state conditions
• Electromagnetic Sound Source; Contained Air Volume (no air compressor needed)
• Flexible portable transceiver unit optimizes system for a wide range of sediments
• Low-noise pre-amp with high/low pass filters and gain control
• User-selectable trigger or external trigger
• Multiple Sources can be synchronized to a common trigger without need for external timing control
• Repeatable Shot-to-Shot Phase and Amplitude Wavelet Correlation > 0.96
• Minimal Electric Power Requirements
• Selectable 110 or 220 VAC power source; Operates on 2 KWatt generator
• Oil-filled single channel hydrophone streamer cable
• 7-meter multi-element active section
• 35-meter deactivation switches on each hydrophone element enable exportation outside of USA
• Compatible with industry-standard data acquisition software & multi-channel streamers

HMS-620LF Bubble GunTM System Components
Source Vehicle and Electromechanical Tow Cable

• Source Type: Electromechanical / Contained Air Volume (no air compressor needed)
• Frequency: Wide band, 20-1700Hz pulse
• Acoustic Source Level: Approximately +220 dB ref 1?Pa @ 1 meter
• Peak-to-Peak Amplitude: Approximately 1 bar-m Normalized Shot-to-Shot Cross Correlation: Repeatable Shot-to-Shot Phase and Amplitude Wavelet Correlation > 0.96
• Tow Vehicle: Stainless steel and plastic frame; buoyant surface-towed vehicle
• Tow Cable: 50-meter abrasion resistant electro-mechanical cable, Approximate Dimensions: 168 cm x 122 cm x 114 cm deployed, or x 61 cm nested (66 in x 48 in x 45 in or 24 in)
• Approximate Weight in Air: Vehicle/Source – 204 kg (450 lbs); Tow Cable - 12.25 kg (27 lbs)

Seismic Transceiver

• Signal Input: Designed to operate with HMS-620LF System Hydrophone Streamer Cable; 7-pin Amphenol connector
• Gain: Adjustable in 3 dB steps 0 to 45 dB;
• Filters: Adjustable high- and low-pass active filters

Power Supply

• Trigger Input: External key or manual time-based selection
• Repetition Rate: 1/4 second maximum
• Transducer Connector: 7-pin Amphenol to mate with HMS-620LF Source Vehicle Tow cable
• Packaging: Portable splash-resistant case
• Dimensions & Weight: 55.88 cm x 53.34 cm x 25.4 cm (22 in x 21 in x 10 in); 17.24 kg (38 lbs) Hydrophone Streamer Cable
• Length: Active section - 7 meters; Single- channel, 24 elements; Leader – 50 meters
• Preamplifier: Integral preamp - 20 dB gain; Designed to operate with HMS-620LF Transceiver
• Power Input: Supplied by transceiver
• Weight in Air: 13.6 kg (30 lbs)