Profiling Buoy System
(*This system is developed by R.&D. Foundation Program, CREST of JST
http://www.jst.go.jp/EN/)
Our Profiling Buoy System (supervised by Prof. Saino and Prof. Ishimaru) is composed of
1) Underwater winch and 2) profiling buoy (refer to Fig. 1). |
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Fig.1.
Outline of Mechanical Component
about POPPS CREST/SORST
Project.
Profiling Buoy System is controlled
by 3 ways; 1 is R/V remotecontroller
(option), 2 is their own timer (time
table, routine acquisition sequence),
3 is e-mail (option)."ngk ocean"
developed and supplied the profiling
buoy (excluding hydrological sensors),
the underwater winch and acoustic
releaser. |
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| Routine acquisition sequence is, |
① Profiling Buoy wakes up at buoy timer or by acoustic signal from
R/V remote commander
② The buoy sends acoustic signal to Underwater Winch
③ The buoy and the winch check self-inspection and the winch pays
out its kevlar rope.
④ The buoy shifts up by own buoyancy and acquires hydrological data
till detecting water surface.
⑤ The buoy detects water surface by its depth sensor and a tension
sensor in the winch
⑥ The buoy stops data acquisition.The winch stops paying out
the rope.
⑦ Optionally the buoy sends a profiling data set by e-mail.
⑧ The buoy and the winch communicate each other by acoustic signal.
⑨ The winch reels in the rope, then the buoy shifts down.
⑩ The winch docks with the buoy, using the winch's latch.
⑪ Sleeping till the next time or mooring array recover time. |
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= 1)Underwater Winch=
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1) Underwater Winch (Model: AES-3), is located below the profiling buoy. AES-3 pays out and reels in a kevlar
rope,received signals from the buoy.Communication method between the buoy and AES-3, is acoustic, not
optical fiber cable nor coaxial cable. Advantages of acoustic communication take little notice of rope/cable
weight, shock at the water's edge and curvature radius.
AES-3 installs a latch unit on top. This unit keeps safety
position (start position) of the buoy while not
operated time. This unit is unique mechanism and can be operated long term deployment of Profiling Buoy
System. |
| Specification of AES-3; |
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Fig. 2 Illustration of AES-3 |
Dimension: dia. 1,000 mm X H 1,800 mm
Weight: air 187kg / water -33kg
Material: SUS304, PVC, POM
Depth Rate: Max. 300msw
Deployment Term: 10 weeks (one profile/day)
Power Supply: DC15.6V(90Ah) X 2 (Li Battery)
one for system, another for motor
Winch Torque: Max 50kgf at min. radius
Winch Rope: dia. 3.8mm kevlar rope x 350m
(Breaking Force 635 kg)
Rope out speed: 8-9m/min at 8kgf buoyancy
Rope in speed: 5-6m/min at 8kgf buoyancy
Acoustic Modem: frequency: 20kHz Band
①Latch
②Transducer
③Winch Drum
④Acoustic Modem
⑤Float
⑥Main Float
⑦Hook Release(option)
⑧Battery Housing
⑨Winch Controller |
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= 2)Profiling Bouy= |
2) Profiling Buoy is located above AES-3. The buoy shifts between
start position and surface by own buoyancy
while AES-3 is operated. style="mso-spacerun:yes"> Vertical
shifting speeds depends on own buoyancy and
water current.Usually, vertical up is 8-9 m/min in buoyancy 8kg
and current ≦ 1 knot. While the buoy shifts
up, it maintains its stability (less pitch and roll, refer to
Fig.4). So the design of the buoy is more suitable for
vertical profiles of CTD, Chl-a, radiance and irradiance data. The
buoy can be optionally mounted Iridium GPS
(emergency equipment) or Data Modem(transmitter equipment to
land).
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| Specification of Profiling Buoy (POPPS CREST/SORST Project) |
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Fig.3 Illustration of Profiling Buoy
Dimension: W 1,875 mm X H 905 mm
Weight: air 135kg / water -8kg
Material: SUS304, PVC, POM
Depth Rate: Max. 300msw
Deployment Term: 10 weeks (one profile/day)
Power Supply: DC15.6V(30Ah) X 1 (Li Battery)
for system, CTD, PRR-800
DC31.2V(30Ah) X 1 (Li Battery)
for FRRF
Data Logger; Memory 2GB (2.5inc. HDD)
Acoustic Modem: frequency: 20kHz Band
①FRRF &PAR sensor (Chelsea or Kimoto)
②PRR-800 (Biospherical)
③Antena of Data Transmitter
④Float with Anti-rolling tank
⑤CTD (FSI)
⑥Buoy Controller
⑦Frame
⑧Tranducer
⑨Float with Iridium GPS (Option)
Float with Anti-rolling tank(Standard) |
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Fig4. Pitch and Roll of the Profiling Buoy while the buoy shifts
up and down in Sagami-Bay.Inner area of yellow
lines is permissible angle of PRR-800.
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Fig.5 Example of the field trial Sagami-Bay and so me vertical plofiles(temperature)
(presented
by Prof. Saino, JST)
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Fig6. Distribution of Temp.(above) and Salinity(below) on October, 2004. (at Stn.3, Sagami-Bay)
(presented
by Prof. Saino, JST)
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Next Field Trial ...From Sept. to Nov.? 2005. ....detail information about POPPS project, is follows.
http://co2.hyarc.nagoya-u.ac.jp/locb/member/saino/index.html
http://co2.hyarc.nagoya-u.ac.jp/labhp/page005.html
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Exhibition List :
Oceanology International 2004 (London, Mar.16-19)
Oceans/Techno Ocean 2004 (Kobe, Nov. 9-12)
Oceanology International 2006 (London, Mar. 21-23)**** |
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