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.
Why choose FOBYHUB
● Based on Professor Li Zhongping 's“Direct water-leaving radiance measurement method”to avoid derivation errors.
● The three floats can be replaced by three fairings to realize the profile spectrum observation (inside the pressure depth of the equipment);
● Open HUB design offers a variety of radiometers.
● The FOBYHUB-Pro version can be customized to integrate devices such as temperature and salinity meters, water fluorescence meters, and user-defined sensors.
● The ultra-lightweight, quick-loading, and easy-to-operate structure, allowing for single-person deployment within 5 minutes.
● The E-Spool Umbilical Cable Smart Spool is equipped with an built-in battery, GPS module, and WiFi module, providing up to 30 hours of battery life.
Models:
| Models | FOBYHUB-E | FOBYHUB-T | FOBYHUB-E-M | FOBYHUB-T-M | |||||
| Subsystem | Parts | Parts Name/Details | |||||||
| Platform | Floating Tripod | EFloat-FHE | EFloat-FHT | EFloat-FHEM | EFloat-FHTM | ||||
| Control Unit | EBOX-FHE | EBOX-FHT | EBOX-FHEM | EBOX-FHTM | |||||
| Intelligent Tether Cable Spool | ESpool | ||||||||
| Deck Unit | Computer, Pre-install FOBYHUB View software/ Smartphone, Pre-install FOBYHUB View App | ||||||||
| Cable | 2 water-proof cables | 2 water-proof cables | 4 water-proof cables | 4 water-proof cables | |||||
| 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 | |||||||||
| Other Sensors | / | / | SBE 37SI | SBE 37SI | |||||
| ECO FL | ECO FL | ||||||||
| Others | Shipping Boxes | EAirBOX-FHE | EAirBOX-FHT | EAirBOX-FHEM |
EAirBOX-FHTM |
||||
The Deployment Scheme for FOBYHUB
The Scheme for FOBYHUB-E
Specifications:
|
Models |
FOBYHUB-E |
FOBYHUB-E-M |
FOBYHUB-T |
FOBYHUB-T-M |
|
System Specifications |
||||
|
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 |
|
AOP Measurements |
Skylight-Blocked Approach |
|||
|
Power supply |
A rechargeable battery built inside of ESpool supplies power to on-water equipment through a tether cable. |
|||
|
Communication |
The desk unit communicates with ESpool through WiFi or CAT5 cable. ESpool communicates with on-water equipment through a tether cable. |
|||
|
Total Weight |
~16kg |
~21.5kg |
~17kg |
~23kg |
|
Floating Tripod |
||||
|
Parts Name |
EFloat-FHE |
EFloat-FHEM |
EFloat-FHT |
EFloat-FHTM |
|
Features |
Made of Carbon Fiber; easy to carry; easy to assemble; easy to deploy |
|||
|
Size |
Ф 1250mm×732mm |
Ф 1280mm×875mm |
Ф 1650mm×940mm |
Ф 1665mm×1092mm |
|
Weight |
~6.6kg |
~12KG |
~7.6kg |
~13.6kg |
|
Control Unit |
||||
|
Parts Name |
EBOX-FHE |
EBOX-FHEM |
EBOX-FHT |
EBOX-FHTM |
|
Features |
Compact; low power consumption; operate underwater or above water; attitude sensor built inside |
|||
|
Size |
Ф58×200mm |
Ф62×200mm |
Ф58×200mm |
Ф62×200mm |
|
Depth Rating |
10m |
|||
|
Attitude Sensor |
Three-axis attitude sensor, output angle range: x、z axis：±180°; y axis：±90°； Angle Accuracy: 0.05°(Static); 0.1°(Dynamic) |
|||
|
Power Supply |
9-20V |
|||
|
Channels |
3 |
15 |
3 |
15 |
|
Intelligent Tether Cable Spool |
||||
|
Parts Name |
ESpool |
|||
|
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 |
|||
|
Tether Cable |
50 meters neutrally buoyant tether cable |
|||
|
Battery |
30000mAh@12V Li-ion Battery |
|||
|
GPS |
Position Accuracy :10m |
|||
|
Size |
380mm×330mm×490mm |
|||
|
Weight |
~9.4KG |
|||
|
Deck Unit |
||||
|
Parts Name |
EDeckUnit-FHE |
EDeckUnit-FHEM |
EDeckUnit-FHT |
EDeckUnit-FHTM |
|
Features |
Computer, Pre-install FOBYHUB View software/ Smartphone, Pre-install FOBYHUB View App |
|||
|
Hyperspectral Irradiance Sensor |
||||
|
Sensor Models |
Easy-HR-I |
RAMSES-ACC-VIS |
||
|
Wavelength Range（nm） |
340-880nm |
320-950nm |
||
|
Detector |
288 channel high sensitivity CMOS array |
256 channel silicon photodiode array |
||
|
Pixel Dispersion（nm/pixel） |
2.7 |
3.3 |
||
|
Wavelength accuracy（nm） |
0.2 |
0.3 |
||
|
Usable Channels |
196 |
190 |
||
|
Typical Saturation （μW·cm-2·nm-1） |
1400@500nm；1600@650nm@4ms Integration Time |
800@500nm；1400@700nm@4ms Integration Time |
||
|
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 |
||
|
Collector |
Cosine response |
Cosine response |
||
|
Accuracy |
Better than 6%~10% |
Better than 6%~10% |
||
|
Integration Time |
0.1-2048ms |
4ms-8s |
||
|
Housing Material |
316L Stainless Steel |
Stainless Steel (1.4571/1.4404) |
||
|
Power Supply |
9-28VDC |
8-12VDC |
||
|
Power Consumption |
~0.6W |
≤0.85W |
||
|
Size |
Ø 40×145mm |
Ø 48×260mm |
||
|
Depth rating |
200 m |
300 m |
||
|
Ambient Temperature |
-10~50℃ |
2~40℃ |
||
|
Hyperspectral Radiance Sensor |
||||
|
Sensor Models |
Easy-HR-R |
RAMSES-ARC-VIS |
||
|
Wavelength Range（nm） |
340nm-880nm |
320nm-950nm |
||
|
Detector |
288 channel high sensitivity CMOS array |
256 channel silicon photodiode array |
||
|
Pixel Dispersion（nm/pixel） |
2.7 |
3.3 |
||
|
Wavelength accuracy（nm） |
0.2 |
0.3 |
||
|
Usable Channels |
196 |
190 |
||
|
Typical Saturation （μW·cm-2·nm-1sr-1） |
140@500nm；160@650nm @4ms Integration Time |
100@500nm @4ms Integration Time |
||
|
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 |
||
|
Field-of-view |
3° |
7° |
||
|
Accuracy |
Better than 6%~10% |
Better than 6% |
||
|
Integration Time |
0.1-2048ms |
4ms-8s |
||
|
Housing Material |
316L Stainless Steel |
Stainless Steel (1.4571/1.4404) |
||
|
Power Supply |
9-28VDC |
8-12VDC |
||
|
Power Consumption |
~0.6W |
≤0.85W |
||
|
Size |
Ø 40×170mm |
Ø 48×300mm |
||
|
Depth Rating |
200 m |
300 m |
||
|
Ambient Temperature |
-10~50℃ |
2~40℃ |
||
|
SBE 37SI CTD |
||||
|
FOBYHUB Models |
FOBYHUB-E |
FOBYHUB-E-M |
FOBYHUB-T |
FOBYHUB-T-M |
|
Temperature |
/ |
Range：-3~45℃；Resolution：0.001℃； Accuracy：±0.05℃(3~31℃) |
/ |
Range：-3~45℃；Resolution：0.001℃； Accuracy：±0.05℃(3~31℃) |
|
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) |
||
|
Input Voltage |
8.5-24VDC |
8.5-24VDC |
||
|
Max Working Depth |
350m |
350m |
||
|
Weight |
2.2kg |
2.2kg |
||
|
ECO FL Chlorophyll Sensor |
||||
|
Wavelength EX/EM |
/ |
470/695nm |
/ |
470/695nm |
|
Range |
0 to 125ug/L |
0 to 125ug/L |
||
|
Accuracy |
0.025ug/L |
0.025ug/L |
||
|
Input Voltage |
7-15VDC |
7-15VDC |
||
|
Max Working Depth |
600m |
600m |
||
|
Weight |
0.4kg |
0.4kg |
||
