APPLIED ACOUSTICS Dura-Spark L80 User manual

Dura-Spark L80
Operation Manual

Dura-Spark L80 Operation Manual
SPK-L80-8000/A
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Revision History
Issue
Change
No.
Reason for change
Date
A
-
Draft
03/09/20

Dura-Spark L80 Operation Manual
SPK-L80-8000/A
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Table of Contents
REVISION HISTORY .......................................................................................................................................... 2
1. INTRODUCTION TO THE DURA SPARK SOUND SOURCE..................................................................... 5
2. COMPONENTS......................................................................................................................................... 6
3. THEORY OF OPERATION ......................................................................................................................... 6
4. DURA SPARK L80 POWER LEVELS.......................................................................................................... 6
5. PULSE SIGNATURE................................................................................................................................... 7
100J................................................................................................................................................................ 7
200J............................................................................................................................................................... 8
300J............................................................................................................................................................... 9
6. DIMENSIONS.......................................................................................................................................... 10
7. CABLING AND CONNECTIONS ............................................................................................................ 11
HVJ2001 JUNCTION BOX LAYOUT AND CONNECTIONS........................................................................................ 11
HVJ3001 JUNCTION BOX LAYOUT .................................................................................................................... 11
HVJ3001 JUNCTION BOX BUZZ BAR ARRANGEMENT ........................................................................................... 12
DURA SPARK 80 -40 TIP ARRANGEMENT........................................................................................................... 12
DURA SPARK 80 -80 TIP ARRANGEMENT........................................................................................................... 13
HVJ3000 JUNCTION BOX INTERLOCK WIRING ................................................................................................... 14
HVC2002 CABLE........................................................................................................................................... 15
8. DEPLOYMENT / INSTALLATION ............................................................................................................ 16
9. MAINTENANCE PROCEDURES.............................................................................................................. 17
TIP WEAR........................................................................................................................................................ 17
MECHANICAL .................................................................................................................................................. 17
10. END OF LIFE RECYCLING / DISPOSAL .................................................................................................. 17
11. SPECIFICATION ..................................................................................................................................... 18
PHYSICAL........................................................................................................................................................ 18
ELECTRICAL SPECIFICATION ............................................................................................................................... 18
COMPATIBILITY ................................................................................................................................................ 18
PERFORMANCE ................................................................................................................................................ 18

Dura-Spark L80 Operation Manual
SPK-L80-8000/A
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Thank you for choosing applied acoustics ltd as one of your equipment suppliers. We
hope you experience many years of reliable operational use from our products.
modulus technology ltd carries out all technical support, servicing and repairs. If you
have any technical issues with our products please contact the modulus technology
team:
Tel: [phone]
Email: [e-mail]
Web: modulustechnology.com
Applied Acoustic Engineering Ltd has made every effort to ensure that the information
contained in this manual is correct at time of print. However our policy of continual product
improvement means that we cannot assume liability for any errors which may occur.
These written instructions must be followed fully for reliable and safe operation of the
equipment that this manual refers to. Applied Acoustic Engineering Ltd cannot be held
responsible for any issues arising from the improper use or maintenance of equipment
referred to in this manual or failure of the operator to adhere to the instructions laid out in
this manual. The user must be familiar with the contents of this manual before use or
operation.

Dura-Spark L80 Operation Manual
SPK-L80-8000/A
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1. Introduction to the Dura Spark Sound Source
The Dura-Spark has been designed to provide a stable, repeatable sound source for
sub-bottom geophysical surveys. The long life, durable electrodes produce a
consistent pulse signature and keep operational maintenance to a minimum. This
provides increased survey efficiency and equipment reliability as the sparker tips
rarely need replacement.
The Dura-Spark L80 is based on the CAT100 catamaran, providing a stable platform
whilst under tow. The Dura-Spark L80 consists of 2 arrays of 40 tips forming a single
array of 80 tips, providing a powerful high resolution sound source.
The typical operational bandwidth of the Dura-Spark L80 is 500Hz to 5KHz. When
coupled with the CSP-Nv Seismic Power Supply the system offers 2000J/s peak
discharge rate, as well as industry leading design and safety standards.

Dura-Spark L80 Operation Manual
SPK-L80-8000/A
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2. Components
•Dura Spark Catamaran complete with 2 x40 Tip Long Life Sparker Arrays.
•HVC2002 High Voltage Cable complete with HVJ2001 Junction Box.
3. Theory of Operation
The sound wave is generated by the electrical energy in the capacitors of the
CSP-Nv discharging across the sparker tips to the earth of the tow-body, through
the sea water to produce a pressure wave.
With increased energy levels a secondary discharge pulse is generated after the
initial discharge. The time delay between initial and secondary is proportional to
the level of energy being discharged. The secondary pulse is commonly known
as the ‘bubble pulse’.
The joule per tip rating should not be exceeded, each sparker tip is rated to 8-
10joule maximum. This is a total max power of 350joule. Exceeding this level will
result in damage to the sparker tip.
Note: - To prevent the bubble pulse the tip to power ratio should not exceed
2-3J per tip.
The joule per tip rating should not be exceeded, each sparker tip is rated to
8-10joule maximum. This is a total max power of 350joule. Exceeding this
level will result in damage to the sparker tip.
4. Dura Spark L80 Power Levels
80 Tips
Min
100J
Max
350J
Typical
200J

Dura-Spark L80 Operation Manual
SPK-L80-8000/A
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5. Pulse Signature
100J
Pulse Width =
250
uSec
V peak to peak =
6.28
V
Source Level =
1.08837
V/Bar
At 1M
220.736
dB re 1.0V/uPa
At 1M

Dura-Spark L80 Operation Manual
SPK-L80-8000/A
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200J
Pulse Width =
250
uSec
V peak to peak =
9.84
V
Source Level =
1.70534
V/Bar
At 1M
224.636
dB re 1.0V/uPa
At 1M

Dura-Spark L80 Operation Manual
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300J
Pulse Width =
250
uSec
V peak to peak =
12.8
V
Source Level =
2.21833
V/Bar
At 1M
226.921
dB re 1.0V/uPa
At 1M

Dura-Spark L80 Operation Manual
SPK-L80-8000/A
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6. Dimensions