HMS-624 Digital CHIRP Side Scan Sonar
from Falmouth Scientific

The HMS-624 Side Scan Sonar System utilizes advanced technology to provide superior imaging capabilities for deep and shallow water applications. The Tow Fish electronics incorporate FSI’s CHIRPceiverTM 24-bit CHIRP signal processing along with dual simultaneous true 100/400 KHz operation which results in very high resolution side scan data at towing depths up to 2,000 meters.

The Topside Power/Data Multiplexer Interface is packaged in a standard 2U 19” rack mount enclosure and provides a 4Mb/s DSL connection for the Tow Fish, and a standard Ethernet connection for the data processor interface. The HMS-624 uses a flexible control interface connected via Ethernet that allows the user to set operating parameters such as CHIRP/CW modes, pulse length, range, and gain.

The system is compatible with third-party Software packages such as OIC GeoDAS, Triton ISIS, and others.

  • Dual Simultaneous 100/400 KHz Frequency Operation
  • Industry Standard Ethernet Interface for Data, Control, & Processing
  • DSL Over Coax Tow Vehicle Data Interface
  • Compatible with Industry Standard Survey Software
  • CHIRP and CW modes
  • Stainless Steel Tow Fish
  • Heading, Pitch, & Roll Sensors (Depth Optional)
  • Two Serial Input Ports for integration of a Magnetometer or other external sensors
HMS624 and example data

Product Dimensions

Physical Dimensions (L x W x H) Weight
HMS-624 Digital CHIRP Side Scan Sonar (instrument only) 152.4 cm x 12.7 cm x 25cm 55 kg in air, 41 kg in water

Technical Specifications

Operation Frequency: 100 kHz, 400 kHz simultaneous; other frequencies available by request
Signal Type: Chirp or CW, User defined
Operating Range: 100 kHz – 600 meters per side
400 kHz – 200 meters per side
Horizontal Beam Width: 100 kHz – 1.0 degrees
400 kHz – 0.3 degrees
Vertical Beam Width: 60 degrees
Depression Angle: Fixed 20 degrees tilted down
Resolution Across Track: 100 kHz – 8cm
400 kHz – 2cm
Standard Sensor: Heading, Pitch, Roll
Optional Sensor: Depth
Serial Inputs for External Sensors: Two serial inputs for external sensors such as a Magnetometer, CTD, etc.; 12 or 24 VDC Sensor Power
Material: 316 Stainless Steel
Operating Depth: 2,000 meters
Power Supply:
Enclosure type: 2U 19” rack mount
Power Input: 115/230 VAC, 50/60 Hz
Tow vehicle power supply rating: 300 VDC @ 2 AMPS
Tow vehicle data interface: DSL, up to 4 Mb/s
Sonar Processor data interface: Ethernet
Tow Cable Type: Coaxial
Tow Cable Lengths: Up to 6,000 meters, depending on cable diameter