FOBYHUB：the floating optical buoy measurement system for apparent optical properties of water
FOBYHUB is a portable, intelligent, floating optical buoy measurement system for apparent optical properties of water, based on a skylight blocked approach. It can be used in the fields of validation and on-site calibration of ocean color satellites, research on apparent optical properties of water, bio-optical algorithms, research and forecast of red tides and algal blooms, and monitoring and prediction of water quality.
Features:
FOBYHUB directly measures water-leaving radiance and downwelling incident irradiance above water at the same time.
FOBYHUB can avoid the derivation error and human operation error that happened in above-water measurements and underwater measurements.
FOBYHUB is an open system. For AOP measurements, Customers can choose radiometers from different manufacturers, such as RAMSES of TriOS in Germany or Easy-HR of EasyOceanTech in Canada. FOBYHUB-M can integrate the SBE 37SI CTD and ECO FL sensor of the Seabird company.
The maximum spectral sampling frequency of FOBYHUB is 4 Hz If you choose Easy-HR radiometers, They can collect hundreds of sets of spectrum data in a minute sampling time.
All models of the FOBYHUB have an ESpool, the intelligent tether cable spool, with a rechargeable Li-ion battery, GPS module, and WiFi module inside. The desk unit can communicate with ESpool through WiFi or CAT5 cable. ESpool can communicate with on-water equipment through a tether cable. The rechargeable battery built inside of ESpool supplies power to on-water equipment.
The above-water part of FOBYHUB weighs less than 15kg. An operator can assemble the system on deck in less than 5 minutes by himself. FOBYHUB does not require extra cable to deploy, and one person can deploy the system on the water surface with an ESpool cable.
Models:
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Models |
FOBYHUB-E |
FOBYHUB-T |
FOBYHUB-E-M |
FOBYHUB-T-M |
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Photo |
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Subsystem |
Parts |
Parts Name/Details |
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Platform |
Floating Tripod |
EFloat-FHE |
EFloat-FHT |
EFloat-FHEM |
EFloat-FHTM |
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Control Unit |
EBOX-FHE |
EBOX-FHT |
EBOX-FHEM |
EBOX-FHTM |
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Intelligent Tether Cable Spool |
ESpool |
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Deck Unit |
Computer, Pre-install FOBYHUB View software/ Smartphone, Pre-install FOBYHUB View App |
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Cable |
2 water-proof cables |
2 water-proof cables |
4 water-proof cables |
4 water-proof cables |
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Sensors |
Radiometers |
EasyOceanTech Easy-HR-R Easy-HR-I |
TriOS RAMSES-ARC-VIS RAMSES-ACC-VIS |
EasyOceanTech Easy-HR-R Easy-HR-I |
TriOS RAMSES-ARC-VIS RAMSES-ACC-VIS |
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Other Sensors |
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SBE 37SI ECO FL |
SBE 37SI ECO FL |
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Others |
Shipping Boxes |
EAirBOX-FHE |
EAirBOX-FHT |
EAirBOX-FHEM |
EAirBOX-FHTM |
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The Deployment Scheme for FOBYHUB The Scheme for FOBYHUB-E
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Models |
FOBYHUB-E |
FOBYHUB-E-M |
FOBYHUB-T |
FOBYHUB-T-M |
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System Specifications |
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Parameters |
Downwelling Incident Irradiance above Water (Es), Water-leaving Radiance (Lw), Remote Sensing Reflectance(Rrs) |
Downwelling Incident Irradiance above Water (Es), Water-leaving Radiance (Lw), Remote Sensing Reflectance(Rrs), Water Temperature, Salinity, Chlorophyll |
Downwelling Incident Irradiance above Water (Es), Water-leaving Radiance (Lw), Remote Sensing Reflectance(Rrs) |
Downwelling Incident Irradiance above Water (Es), Water-leaving Radiance (Lw), Remote Sensing Reflectance(Rrs), Water Temperature, Salinity, Chlorophyll |
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AOP Measurements |
Skylight-Blocked Approach |
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Power supply |
A rechargeable battery built inside of ESpool supplies power to on-water equipment through tether cable. |
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Communication |
Desk unit communicates with ESpool through WiFi or CAT5 cable. ESpool communicates with on-water equipment through tether cable. |
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Total Weight |
~16kg |
~21.5kg |
~17kg |
~23kg |
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Floating Tripod |
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Parts Name |
EFloat-FHE |
EFloat-FHEM |
EFloat-FHT |
EFloat-FHTM |
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Features |
Made of Carbon Fiber; easy to carry; easy to assemble; easy to deploy |
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Size |
Ф 1250mm×732mm |
Ф 1280mm×875mm |
Ф 1650mm×940mm |
Ф 1665mm×1092mm |
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Weight |
~6.6kg |
~12KG |
~7.6kg |
~13.6kg |
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Control Unit |
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Parts Name |
EBOX-FHE |
EBOX-FHEM |
EBOX-FHT |
EBOX-FHTM |
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Features |
Compact; low power consumption; operate underwater or above water; attitude sensor built inside |
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Size |
Ф58×200mm |
Ф62×200mm |
Ф58×200mm |
Ф62×200mm |
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Depth Rating |
10m |
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Attitude Sensor |
Three-axis attitude sensor, output angle range: x、z axis：±180°; y axis：±90°； Angle Accuracy: 0.05°(Static); 0.1°(Dynamic) |
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Power Supply |
9-20V |
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Channels |
3 |
15 |
3 |
15 |
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Intelligent Tether Cable Spool |
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Parts Name |
ESpool |
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Features |
Compact; easy to carry; low power consumption; 50 meters tether cable; a 12V 30000mAH rechargeable Li-ion battery built inside; GPS module and WiFi module built inside |
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Tether Cable |
50 meters neutrally buoyant tether cable |
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Battery |
30000mAh@12V Li-ion Battery |
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GPS |
Position Accuracy :10m |
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Size |
380mm×330mm×490mm |
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Weight |
~9.4KG |
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Deck Unit |
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Parts Name |
EDeckUnit-FHE |
EDeckUnit-FHEM |
EDeckUnit-FHT |
EDeckUnit-FHTM |
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Features |
Computer, Pre-install FOBYHUB View software/ Smartphone, Pre-install FOBYHUB View App |
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Hyperspectral Irradiance Sensor |
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Sensor Models |
Easy-HR-I |
RAMSES-ACC-VIS |
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Wavelength Range（nm） |
340-880nm |
320-950nm |
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Detector |
288 channel high sensitivity CMOS array |
256 channel silicon photodiode array |
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Pixel Dispersion（nm/pixel） |
2.7 |
3.3 |
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Wavelength accuracy（nm） |
0.2 |
0.3 |
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Usable Channels |
196 |
190 |
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Typical Saturation （μW·cm-2·nm-1） |
1400@500nm；1600@650nm@4ms Integration Time |
800@500nm；1400@700nm@4ms Integration Time |
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Typical NEI（μW·cm-2·nm-1） |
1.2×10-4@500nm；1.4×10-4@650nm@2s Integration Time |
0.4×10-4@500nm；0.6×10-4@700nm@8s Integration Time |
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Collector |
Cosine response |
Cosine response |
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Accuracy |
Better than 6%~10% |
Better than 6%~10% |
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Integration Time |
0.1-2048ms |
4ms-8s |
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Housing Material |
316L Stainless Steel |
Stainless Steel (1.4571/1.4404) |
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Power Supply |
9-28VDC |
8-12VDC |
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Power Consumption |
~0.6W |
≤0.85W |
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Size |
Ø 40×145mm |
Ø 48×260mm |
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Depth rating |
200 m |
300 m |
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Ambient Temperature |
-10~50℃ |
2~40℃ |
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Hyperspectral Radiance Sensor |
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Sensor Models |
Easy-HR-R |
RAMSES-ARC-VIS |
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Wavelength Range（nm） |
340nm-880nm |
320nm-950nm |
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Detector |
288 channel high sensitivity CMOS array |
256 channel silicon photodiode array |
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Pixel Dispersion（nm/pixel） |
2.7 |
3.3 |
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Wavelength accuracy（nm） |
0.2 |
0.3 |
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Usable Channels |
196 |
190 |
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Typical Saturation （μW·cm-2·nm-1sr-1） |
140@500nm；160@650nm @4ms Integration Time |
100@500nm @4ms Integration Time |
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Typical NEI（μW·cm-2·nm-1sr-1） |
1.2×10-4@500nm；1.4×10-4@650nm @2s Integration Time |
0.25×10-4@500nm @8s Integration Time |
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Field-of-view |
3° |
7° |
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Accuracy |
Better than 6%~10% |
Better than 6% |
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Integration Time |
0.1-2048ms |
4ms-8s |
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Housing Material |
316L Stainless Steel |
Stainless Steel (1.4571/1.4404) |
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Power Supply |
9-28VDC |
8-12VDC |
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Power Consumption |
~0.6W |
≤0.85W |
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Size |
Ø 40×170mm |
Ø 48×300mm |
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Depth Rating |
200 m |
300 m |
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Ambient Temperature |
-10~50℃ |
2~40℃ |
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SBE 37SI CTD |
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FOBYHUB Models |
FOBYHUB-E |
FOBYHUB-E-M |
FOBYHUB-T |
FOBYHUB-T-M |
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Temperature |
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Range：-3~45℃；Resolution：0.001℃； Accuracy：±0.05℃(3~31℃) |
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Range：-3~45℃；Resolution：0.001℃； Accuracy：±0.05℃(3~31℃) |
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Conductivity |
Range：2~70 mS/cm；Resolution：0.001 mS/cm；Accuracy：±0.05 mS/cm(2-65 mS/cm) |
Range：2~70 mS/cm；Resolution：0.001 mS/cm；Accuracy：±0.05 mS/cm(2-65 mS/cm) |
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Input Voltage |
8.5-24VDC |
8.5-24VDC |
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Max Working Depth |
350m |
350m |
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Weight |
2.2kg |
2.2kg |
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ECO FL Chlorophyll Sensor |
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Wavelength EX/EM |
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470/695nm |
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470/695nm |
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Range |
0 to 125ug/L |
0 to 125ug/L |
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Accuracy |
0.025ug/L |
0.025ug/L |
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Input Voltage |
7-15VDC |
7-15VDC |
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Max Working Depth |
600m |
600m |
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Weight |
0.4kg |
0.4kg |
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