HMS-620 Bubble Gun Seismic Reflection Profiler Sample Clauses

HMS-620 Bubble Gun Seismic Reflection Profiler. Exploration of the subsurface was accomplished with a bubble gun profiler operating in the 70-700 Hz frequency range, designed for penetration through coarser surficial sediment and increased depths below the seafloor. The system consists of the bubble gun sound source (electromagnetic, contained air) mounted below a catamaran, powered by the HMS-620 transceiver including single or dual power supplies and a single channel receiver. A 24-element hydrophone array or streamer is interfaced to the receiver for input of reflected acoustic signals. The receiver features basic signal functions including initial gain amplification and a bandpass filter with low and high cutoff options. The sound source and streamer are towed astern of the vessel and outside the propeller wash to minimize ambient noise on the hydrophones and interference to the bubble gun transducer. Seismic data were recorded (SEG Y format) together with GPS positions by SonarWiz Version 5 acquisition software on a topside notebook computer. The computer was interfaced to the HMS- 620 transceiver for triggering and data transfer via a Chesapeake Technologies, Inc. (CTI) analog interface console. Specific acquisition settings are provided below. Project Specific Seismic Parameters: • 250 ms trigger rate • 125 ms record length • 9-12 dB initial gain amplification • Filter open (no bandpass)
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