DATASONICS CHIRP II ACOUSTIC PROFILING SYSTEM
G E O P H Y S I C A L
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.A C O U S T I C S
.F L O T A T I O N
.G E O P H Y S I C A L
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.MODEMS
.R O B O T I C S
Low cost, single or dual frequency high resolution
Chirp sub-bottom profiling system
Leadership
by Design
CHIRP II ACOUSTIC PROFILING SYSTEM
Redefining the Chirp
Advantage—CHIRP II
Datasonics, pioneers in chirp technology, were the first to bring a commercial Chirp sub-bottom
profiling system to the offshore market. After ten years of strong product sales and system
enhancements, Benthos continues the advancement of the Chirp II Sub-Bottom Profiling System.
PORTABLE AND AFFORDABLE
The Chirp II Sub-Bottom Profiler is a portable and affordable additon to the Benthos line of geophysical
products. This lightweight, low cost system is ideally suited for small boats and small budgets.
VERSATILE SYSTEM CONFIGURATION
The modular Chirp II Sub-Bottom Profiler has been designed to operate with a wide variety of tow
vehicles/sound sources. System configurations include:
. TTV-170 shallow water vehicle (to 600 meters).
. TTV-190 deep water vehicle (to1000 meters).
. AUV configuration.
. Hull mount configuration.
. Low frequency Bubble Pulser source (400 Hz).
SIMULTANEOUS DUAL-FREQUENCY OPERATION
The Chirp II offers simultaneous dual-frequency
operation which covers a wide spectrum of
frequencies (2-7 kHz and 10-20 kHz). This choice
of frequencies and selectable chirp bandwidths
allows the operator to optimize the system
configuration for
sediment penetration
and layer/object
resolution.
Model CAP-6600 Chirp Acoustic Profiling System,
configure with TTV-170 Tow Vehicle.
TTV-190 Deep Chirp II Tow Vehicle.
Chirpscan software simultaneously
displays high frequency Chirp data,
low frequency analog Bubble Pulser,
and data.
Single frequency data sample collected by the Geological Survey for CNR,
Italy, utilizing low frequency Chirp II (2-7 kHz) hull mount array.
CHIRP II SOFTWARE FEATURES
■ User-friendly Windows™ graphics interface allows
for multi-tasking and extensive real-time sonar/
sensor data processing and display.
■ New Chirp-DSP algorithms provide continuous
digital storage and display of all seismic data.
■ Stored calibrated data provides for real-time
computation of seabed reflection coefficients, which
can then be used with classification algorithms to
predict bottom material types. A classification
algorithm is included with standard Chirpscan
software.
■ Unprocessed matched filtered data is stored in
SEG-Y format to a Magneto-Optical disk (optional).
■ Real time quality control and on site processing.
■ Interactive horizon picking.
■ User defined ping rate.
■ Swell filter.
■ Automatic gain control.
Dual frequency data sample collected utilizing a Chirp II TTV-190 Deep
Water Tow Vehicle.
CHIRP II HARDWARE FEATURES
■ Simultaneous dual-frequency operation allows for a
choice of Chirp FM sweeps from 400 Hz to 20 kHz.
■ Flexible Chirp II acquisition/processing work station
allows for versatile configurations including shallow
and deep water vehicles, diverse hull mount arrays,
AUV’s, and input from analog sources.
■ Ethernet output.
■ High power output–up to 4 KW each channel.
■ Bathymetry, integrated pressure sensor (optional).
CHIRP II ACOUSTIC PROFILING SYSTEM
SPECIFICATIONS
Main Processor:
DSP Sonar Signal Processing:
Data Storage:
Operator Software:
Display:
Ping Rate:
Pulse Length:
Output Power:
Transducers:
Cable:
Operating Depth:
Navigation/Annotation:
Hard Copy Recorder:
Operator Controls:
Operator Displays:
Dimensions and Weight:
Shipboard enclosure:
Tow vehicle:
PC based sonar work station with high resolution graphics engine.
Two DSP channels, 16 bit A/D, continuous FFT each transmission, each channel.
Stores raw data in SEG-Y format (magneto-optical disk optional).
Chirpscan in Windows™ environment.
2048x1024 virtual display.
12 pings/second maximum.
User selectable from 5 msec. to 50 msec. Pulse waveforms stored in memory.
4 KW each channel max.
AT-471, Chirp bands 2 to 7 kHz.
AT-12D7, Chirp bands 10 to 20 kHz.
Kevlar electrical umbilical cable.
TTV 170: 600M maximum.
TTV 190: 1000M maximum.
Nema 0183 interface, event/fix marks, external interrupt.
Grey scale graphic recorder, centronix interface.
HW gain (dual channel) 0-42dB/channel; two stage TVG; bottom tracking (dual channel);
smoothing; horizontal/vertical zoom; display gain control; repetition rate control; custom FM
waveform design.
Bathymetry display; reflectivity and hardness display; signal to noise ratio display; voltage
display; custom color palette selection; color rotation; navigation map display.
20" wide x 15" high x 22" deep; weight–120 lbs.
TTV 170: 18" O.D. x 24" long; weight in air–98 lbs., weight in water–80 lbs.
TTV 190: 18" O.D. x 64" long; weight in air–300 lbs., weight in water–170 lbs.
APPLICATIONS
. OFFSHORE HAZARD SURVEYS. The high resolution color display, elimination of spacial side lobes,
and data logging in a SEG-Y format provide the geophysicist with the optimum tool for analysis of
sediment foundation properties, faulting, gas seeps and other sediment properties of interest.
. PIPELINE AND SMALL OBJECT SURVEYS. Wide bandwidth CHIRP processing with 6 to 8 cm
resolution, combined with special projector/hydrophone arrays designed specifically for this
application, provide the best acoustic solution for detecting pipelines and/or small objects. Inclusion
of a magnetometer sensor can greatly assist in data interpretation where the target is difficult to
identify on the display because of burial depth, sediment properties, or extremely small size.
. BRIDGE PILING SCOUR AND ENVIRONMENTAL SURVEYS. Use of a wide CHIRP bandwidth and
capability for operation from small boats makes CHIRP II ideal for use in rivers, lakes, dams, and other
shallow water applications. Special calibrated transducer mounting allows directional operation
around obstacles such as bridge pilings.
. MINING AND DREDGING. CHIRP II provides the system bandwidth and resolution required to
identify and measure resuspended sediment, which can be a problem when making dredge volume
calculations. System calibration and quantitative control of operating parameters allows
determination of dredging depth contours.
Specifications are subject to
change without notice.
© 2000 BENTHOS, INC.
Benthos and the Benthosaurus
fish logo are registered
trademarks of Benthos, Inc.
Other products and company
names mentioned herein may
be trademarks and/or
registered trademarks.
Benthos, Inc. • 49 Edgerton Drive, North Falmouth, MA 02556 USA
Tel 508-563-1000 or 800-446-1222 (USA only) • Fax 508-563-6444 • E-mail [email protected]
www.benthos.com