atlas-parasound 2008-05

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ATLAS PARASOUNDDeep-Sea Parametric Sub-Bottom Profiler

VIII SEPHC Cartagena, May 2008Steffen Pausch

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Content

1. ATLAS Hydrographic - company profile

2. Introduction to Sub-Bottom Profiling

3. ATLAS PARASOUNDDeep-Sea Parametric Sub-Bottom Profiler

4. Application BenefitsATLAS PARASOUND Advantages

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Commitment to Hydrography Since 1905

OurHistory

Picture from Nieder, Fritz.; Schroeder Willy: Seevermessung - 25 Jahre im Deutschen Hydrographischen Institut (1945-1970), DHI,Hamburg 1971

ATLAS Hydrographic

Pioneer in echosounder development

ATLAS DESO

ATLAS HYDROSWEEP

ATLAS FANSWEEP

ATLAS PARASOUND

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References

Peru

Argentina

Chile

Columbia

United States

South Africa

Cameroon

Kenya

Australia

New Zealand

PapuaNew Guinea

Indonnesia

Japan

SouthKorea

Taiwan

Russia

China

India

Malaysia

Thailand

Singapore

Vietnam

SpainPortugal

EgyptSaudiArabia

IranPakistan

Turkey

Scri Lanka

AlgeriaTunesia Kuweit

Mozambique

Morocco

Italy

Nigeria

Bangladesh

Oman

United Kingdom

Norway

Sweden Finland

Latvia

Lithuania

Lebanon

Czech Republic

SlovakiaBelgium

Netherland

Austria

Qatar

Slovenia

Turks andCaicos Islands

Serbia

BulgariaCroatia

Romania

Luxembourg

Netherlands Antilles

United Arab Emirates

Denmark

Germany

France

Greece

Poland

SwitzerlandHungary

Systems

DESOs

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ATLAS DESO 300

ATLAS DESO 350M

ATLAS DESO 350ATLAS DESO 30 ATLAS DESO 35

Echosounder No. of Channels Recording Mode Approx. Depth Range[1]

ATLAS DESO 300 1 Paper 600 m

ATLAS DESO 30 2 Paper or Digital 6,000 m

ATLAS DESO 350 1 or 2 Digital 600 m

ATLAS DESO 350 M 2 Digital 1,500 m

ATLAS DESO 35 2 or 3 Digital 11,000 m

[1] Depending on chosen frequency and type of transducer.

ATLAS Single-Beam Echosounders

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ATLAS Single Beam Transducers

ATLAS Quality Transducers

210 kHz ATLAS SW6014

33 kHz ATLAS SW6028

Casings and accessories

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ATLAS HYDROSWEEP DSMax. depth: approx. 11,000 m

ATLAS HYDROSWEEP MD/30 Max. depth: approx. 6,000 m

ATLAS FANSWEEP 20Max. depth: approx. 200 - 600 m ATLAS PARASOUND

Max. depth: approx. 11,000 mMax. penetration: >200 m

ATLAS HYDROSWEEP MD/50Max. depth: approx. 2,000m

ATLAS Multibeam Echosounder and Sub-Bottom Profiler

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ATLAS IS3 - Integrated Survey Sensor System

Tailor made solutions

Well structured modularity

Sub-Systems Administration Echosounders Auxiliary Sonars Synchronisation Auxiliary Sensors Post-Processing Sensor Network

Supports ATLAS echosounders as well as 3rd party equipment

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• training for complete survey system• service & support

• wide range of different sensors from various manufactures

• all kind of echo sounders,• all acquisition and processing software

• consultancy for project management• installation, commissioning, acceptance tests

ATLAS Hydrographic provides…

… a total hydrographic solution!

• turnkey solution by integration of all survey components

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Introduction to Marine Sub-Bottom Profiling

Typical application of sub-bottom profilers

Shallow water, shallow penetration, rapid sub-bottom studies Near shore construction site surveys (e.g. sea wall construction, coastal

protection) Near shore, inland sedimentation analysis (e.g. Elbe river, sedimentation in

Hamburg harbour and Elbe navigation channel) Dredging (e.g. volume calculation) Burried object detection

Deeper water, on-the-fly data collection Marine sedimentation processes for climate research (e.g. analysis of ocean

currents change) Sub-bottom stability prognoses (e.g. for cable laying) Search for gas hydrate deposits Pre-surveys for e.g. bottom sampling EEZ survey support, to find the foot of the continental slope

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Echosounders To measure the water depth Compact in-a-box electronic, simple

acoustic transducer Frequency typically 12 to 210 kHz

Sub-bottom profilers To analyse sub-bottom structure and

layer thickness in highest resolution Larger electronic equipment Frequency typically 3 to 20 kHz

Marine seismic appliances To analyse sub-bottom structure and

layer thicknesses Larger electronic equipment, with

complex mechanical hydrophone streamers

Frequency typically 0.5 to 3 kHz

resolution and accuracy

range and penetration

Instruments for sub-bottom profiling …depend on frequency of acoustic signal:

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Classes of sub-bottom profilers

Classification by Installation and operation Towed fishes Vessel hull mounted

Classification by signal generation Conventional (non-parametric) generation of low frequency signal

with either low horizontal resolution or huge transducer array sizes Parametric generation of the low frequency signal

with reasonable transducer array size, very high horizontal resolution


ATLAS PARASOUND

is a hull mounted, parametric sub-bottom profiler

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Parametric Effect

• Transmission of 2 high energy signals of slightly different frequency

• Non-linear hydro-acoustic behaviour of water for high energy signals

• Creation of harmonics at difference frequency and frequency sum

• E.g. Primary signals: 18 and 21 kHzParametric signals: 3 and 39 kHz

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Content





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ATLAS PARASOUND Deep-Sea Parametric Sub-Bottom Profiler

Deep-sea parametric sub-bottom profiler

Depth Range 11,000 m

Sub-Bottom Penetration up to >200 m

Profiling of ocean sub-bottom and water column

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Electronics Design Concept

AEU Analog Electronic Unit

DEU Digital Electronic Unit

ICU InterConnection Unit

ICU

AEU

DEU

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ATLAS echosounder family

Common Design

Common electronic components

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Product Variants ATLAS PARASOUND

P70 with 70 kW maximum transmit power Max penetration >200 m Full flexibility with max number of acoustic

elements and channels 384 acoustic elements in triplets 128 stave channels

P35 with 35 kW maximum transmit power Max penetration >150 m Standard configuration for typical sub-

bottom profiling tasks 192 acoustic elements in triplets 64 stave channels

P70 transducer array

P35 transducer array

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Software

Sensor ControlATLAS HYDROMAP CONTROL

For all ATLAS HYDROSWEEP, FANSWEEP and PARASOUND

Comprehensive parameter control Multi-user, multi-client, multi-sensor Data quality monitoring

Data Acquisition, Processing, ReplayATLAS PARASTORE

Profile data acquisition for ATLAS HYDROSWEEP and PARASOUND

Sediment profile, water column profile Numerical and graphical data processing Industrial standard SEG-Y and PS3 export

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Key Features ATLAS PARASOUND

Frequency 0.5 kHz to 6.0 kHz

Full ocean depth range, maximum sediment penetration >200 m

Superb vertical resolution 6.1 cm, high horizontal resolution 4.5° x 5°

24 Bit dynamic range at 128 reception channels To perceive everything – even the faint air

bubble above the bedrock echo To look everywhere – even electronically steered

2 km off track

Multi-ping

Watch free operation

Water column to full ocean depth

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Content





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PARASOUND Operation Modes

P-SBP/SBES Parametric sub-bottom profiling, single beam Single beam profiling of sub-bottom Multi-ping

P-SBP/MBES Parametric sub-bottom profiling, multibeam Multiple single beams send out across track in multi-ping 17 beams across swath, swath width 50°

MBES Multibeam Omni direction transmission in full 25° x 15° Reception beamforming into 17 x 9 beams

43

21

5

All 1 ping

4321

5

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Application BenefitsATLAS PARASOUND Advantages

ATLAS PARASOUND data from R/V POLARSTERNover the same spot with Multiping ATLAS PARASOUND

4.5° x 5.0°

6.1 cm

Multi-ping

ATLAS PARASOUND data from R/V POLARSTERNwithout Multiping

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Water column profilingdown to the very bottom

Gas Hydrate localisation Finding escaping gas in the water column Pinpointing to source localisation

Evaluation of deposit quality Profiling the water column down to the

very bottom Profiling of sediment to identify existing

geological structures (e.g. gas chimneys, faults, gas saturated sediment)


Submarine gas releases at the gas hydrate site GC-234 in the Gulf of Mexico, data by courtesy of R/V SONNE

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Water column profilingdown to the very bottom

Enormous amplitude contrast between

Gas bubble Sea bottom

In layer directly above sea bottom, this cannot be compensated by standard TVG adjustments, without loss in sediment data


Echo amplitude

Travel time

Dynamic range = 144 dB (24 bit)

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ATLAS PARASOUND Double Digitising Technology (DDT)

192 dB (32 bit)

LSB threshold (1 bit)

Analog signal with high dynamic range

Digitised analog signal by merging of attenuation channel and amplification channel

+24 dB

Amplification channel with 24 bit ADC conversion

saturation

144 dB

-24 dB

Attenuation channel with 24 bit ADC conversion

144 dB

32 bit = 24 bit + 2 • 4 bit

LSB

168 dB(28 bit)

1 bit is equivalent to 6 dB


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Water column profilingATLAS PARASOUND

Gas Hydrate localisation Finding escaping gas in the water

column Pinpointing to source localisation

Evaluation of deposit quality Profiling the water column down

to the very bottom Profiling of sediment to identify

existing geological structures (e.g. gas chimneys, faults, gas saturated sediment)


SedimentStructure

visible

Escaping gas in water column

Acoustic blanking due to

gas saturation

Two way profiling at the same time and locationTop: water column profile, Bottom: sediment profile

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Pre-Survey for geological detail studies with

ATLAS PARASOUND Support coring In parallel operation to multi-beam, seismic survey

- Synchronisation with ATLAS HYDROSYNC

- High survey speed (up to 15 kn)

No restrictions (ice, depth) and good positioning Fixed installation

- no additional infrastructure like winches

- no additional mobilisation time

Direct online printout Replay

Highly compact layer– sampling at minimum coring depth

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Marine Mammal Protection


1.1. Automatic Transmission Source Level Control (ASLC)Automatic Transmission Source Level Control (ASLC)1.1. Automatic Transmission Source Level Control (ASLC)Automatic Transmission Source Level Control (ASLC)

2.2. Possibility of conventional (= non-parametric) sub-bottom profilingPossibility of conventional (= non-parametric) sub-bottom profiling2.2. Possibility of conventional (= non-parametric) sub-bottom profilingPossibility of conventional (= non-parametric) sub-bottom profiling

3.3. Whale Warning Mode (WWM)Whale Warning Mode (WWM)3.3. Whale Warning Mode (WWM)Whale Warning Mode (WWM)

4.4. Reduced Transmission Source Levels Due to Chirped and Barker Reduced Transmission Source Levels Due to Chirped and Barker Coded PulsesCoded Pulses

4.4. Reduced Transmission Source Levels Due to Chirped and Barker Reduced Transmission Source Levels Due to Chirped and Barker Coded PulsesCoded Pulses

5.5. Automatic Transmission TerminationAutomatic Transmission Termination5.5. Automatic Transmission TerminationAutomatic Transmission Termination

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Thank you for attention.

Enjoy the

ATLAS PARASOUND!

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Single ping profiling

Next ping is send, when previous is completely received

Gaps between beams possible, depending on vessel speed

overlapping of footprints


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multiple overlapping of footprintshomogeneous ensonification

pulse spacing(min. 20 ms)

ATLAS PARASOUNDQuasi-Equidistant Mode

Multi ping

Ping separated in time for optimum sediment coverage

Ensuring gapless profiling up to 15 knots vessel speed

Homogenous coverage of seafloor


atlas-parasound 2008-05

Documents

atlas parasound deep

deposit quality profiling

gas saturated sediment

company profile introduction

low frequency signal

water column pinpointing

atlas parasound data

atlas parasound