Transcript - Swedish Sonar Services

Established in 2003
4 employees
Product development, production, marketing and sales of
side scan sonar systems type SH
Performs:
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Sea floor surveys
Search for lost objects and equipment
Documentation of wrecks
Search for sunken timber
Documentation of dams, rivers and creeks
Surveys for cable and pipe laying
Documentation and inspections of harbors
Surveys for pre-engineering and feasibility studies
- Diving and photo and film documentation
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P51 Mustang / J26
”Blue Olof” from the Swedish airforce, lost in 1946, was found 2003 at
50 meters depth with equipment from Swedish Sonar Services AB.
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SH 200/500/800 kHz
Designed by Sture Hultqvist
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Side Scanning Sonar
SH 200/500/800 kHz
The System consists of:
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Electronic box for signal detection in waterproof box
Sonar fish/underwater body for ultra sound
Cable (70 m std)
Software for image generating
PC for image handling and storage (not included)
GPS-receiver (not included)
Total weight < 30 kg
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SH 200/500/800
Technical specification
1. Frequency 200, 500 or 800kHz
2. Beam width 200kHz (depending on freq: vertical 60o ; longitudinal direction
perpendicular to towing <1o (The elements are angeled 25o down.
The Aperture is 407x5 mm2 for short fish and 610x5 mm2 for long fish.
500 kHz has the same aperture lenght but is only 3 mm wide.
There is no shadowing from the sensors.
3. Swath width:
Normally 400 m. 600 m with less resolution.
4. Max speed with full bottom coverage.
Typical towing speed is 6 knots. Maximum 8 knots
5. Bottom resolution.
15 cm, less at higher speeds and larger distances.
6. The device cab optionally measure the distance to the sea bottom (topographic
mapping). The water column and the surface reflex in the middle of the image
give depth information etc.
7. Array: Linear (Separate elements are not accessible).
8. Synchronization of pings with parallel systems is possible.
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SH 200/500/800
Applications
• Sea bottom surveys: Sea, lakes, dams.
• Positioning of objects on the sea bottom and in
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the water e.g. wrecks, lost or dumped
equipment, mines, human bodies etc.
Inspection of under water equipment and
constructions.
Mapping (requires extra software), even with
several parallel vessels (raking)
Surveillance of suspicious underwater activities
with mobile or fixed equipment.
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Track on the
bottom after
dragging or
anchor.
Lancaster bomber WW2
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Nedjan
Disappeared in a winter storm 1954 outside Gävle
Found in 2000 with the equipment SH 200
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Nordstjernan 1
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Note detailes. The ship rests at
120 m depth.
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Mailship type side-wheeler
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Torpedo blown stern
S7 – Russian submarine
Shadow of canon, tower
and netknife.
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Bottom shapes
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Boat
Ca 4-5 meter long with outborder 20 meters depth.
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Fishing net
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Unidentified object
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Image from the bottom
outside a quay.
Notice car tire.
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Tug ”Polarbear”.
Used as a gunboat during ww2.
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Quay support outside the harbour of Swedish Steel AB Oxelösund.
Cooling pipe of wood.
Diam. ca 32 in.
Tires
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Oil barrels
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