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FSI - Model HMS-621 CHIRPceiver Litt -Single Frequency Sub-bottom Profiler
Sub-bottom profiling applications in diverse sediments in shallow water environments require compact tools as well as multiple frequency bands to support a variety of survey requirements. The HMS-621 CHIRPceiver LittTM and transducer arrays fill this wide range of survey needs. The user selectable frequency bands supported by the HMS-621 include standard LF (1KHz-10KHz), or HF (8KHz-23KHz). It can be easily configured for pipeliner detection with a standard single channel user configurable transceiver. CW frequencies can also be programmed within the respective band. The transducer and hydrophone arrays are configured to perform both the transmit and the receive functions of the system.
The HMS-621 CHIRPceiver Litt uses a flexible Graphical User Interface connected via Ethernet that allows the user to set CHIRP or CW modes of operation, Start and Stop frequencies, and Pulse Lengths and Power Level for the output pulses. The receiver controls allow for Gain and Attenuation as well as Diagnostic modes. All sonar data is logged in SEGY format using industry standard acquisition software.
- CHIRP acoustic pulses in standard LF band (1KHz-10KHz), and HF (8KHz-23KHz) bands provide bottom penetration through many sediment types
- Flexible transducer array options for a variety of vessel configurations
- Industry Standard Ethernet Interface for Data and Control
- Universal input power supply operates from 85 to 240 VAC
- Single-Channel True 24-bit A/D Range
- Seabed Classification
- Industry standard SEGY output
Single Channel Frequency User Selectable
Low Frequency Band
- Transmitter and transducer: Array sizes from 1 to 4 Low Frequency 3.5 KHz Transducers
- Power output:
- 1.5 kw, 15% duty cycle at 3.5 kHz for
- 212 dB re 1 μPa @ 1 m nominal,
- 2.5 kw maximum at reduced duty cycle
- Penetration: 5m or greater sand 75m or greater in clay
- Frequency range: Sweeps in the 1kHz to 10kHz band
- Resolution: <10cm
- Transducer radiation: 45° Conical (for a 2x2 4-element array)
High Frequency Band
- Transmitter transducer: One 7-element high frequency transducer
- Power output: 1 kw, 15% duty cycle at 15 kHz for 214 dB re 1 μPa @ 1 m nominal,
- Penetration: 5m sand 50m or more in clay
- Frequency range: Sweeps in the 8kHz to 23kHz band
- Resolution: <5cm
- Transducer radiation: Conical Array: 20°
- Pipeliner Array: 120 ° along track, 9° across track
- Control: Software control through system Ethernet port
- Trigger: Internal or External
- Frequency: LF (1KHz-10KHz), HF (8KHz-23KHz) CHIRP and CW
- Pulse Length: User Programmable for CHIRP and CW modes (15% duty cycle)
- Transmit Power: 0-42 dB in 3 dB minimum increments
- Preamplifier gain: 42 dB in 3 dB increments
- Preamplifier attenuation: -42 dB in 3 dB increments
- A/D Input: 24bitupto192KHz
* Specifications Subject to Change Without Notice