FOBYHUB
The FOBYHUB is a floating measurement system for the apparent optical properties of water, based on the "Skylight-blocked (SBA) approach" proposed by Professor Zhongping Lee. It is a compact, intelligent, drifting optical buoy system that utilizes an in-situ direct measurement approach for profiling the apparent optical properties of water. The system synchronously measures the incident solar irradiance and the radiance below the water surface. Its unique tripod buoy design minimizes self-shadowing effects. The system integrates remote telemetry, intelligent spectral acquisition, automatic integration time adjustment, and synchronous recording of attitude and GPS data. It provides customers with a convenient and user-friendly operating experience.
● 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.
Why choose FOBYHUB
Product Consists
Table1.1 Product specification
|
subsystem |
component |
FOBYHUB |
FOBYHUB-Pro |
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Product appearance |
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Platform |
Tripod floating body |
EFloat-FH |
EFloat-FHP |
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Tripod floating body |
Tripod floating body |
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General control host of water equipment |
EBOX-FH |
EBOX-FH Pro |
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General control host of water equipment |
General control host of water equipment |
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Intelligent cable shaft of umbilical cable |
E-Spool Intelligent cable shaft of umbilical cable |
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deck unit |
ThinkPad notebook, pre-installed supporting software |
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wire cable |
1 watertight cable |
3 watertight cable |
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Integrated transducer |
radiometer |
HR-2 radiometer or RAMSES series radiometer |
HR-2 radiometer or RAMSES series radiometer |
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other sensors |
/ |
SBE 37SI Temperature and salt instrument and ECO FL Chlorophyll sensor or user specified sensor |
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others |
packing case |
EAirBOX-FH air box |
EAirBOX-FH air box |
Figure1.2 Working diagram of FOBYHUB
Product Parameter
Table1.2 Parameter Product parameter table
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Product Model |
FOBYHUB |
FOBYHUB-Pro |
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Observation capability |
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Observational parameter |
Surface incident spectral irradiance, water-leaving radiance (derived parameter: remote sensing reflectance). |
Surface incident spectral irradiance, water-leaving radiance, water temperature, salinity, and chlorophyll concentration (derived parameter: remote sensing reflectance). |
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Remote sensing reflectance measurement method |
Direct measurement method of water-leaving radiance by the skylight-blocked approach (SBA) |
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Spectral signal acquisition method |
Dual channel, synchronous acquisition |
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Attitude output |
Inclination angle, error≤1° |
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Power supply system |
The water surface equipment is powered by the built-in battery of the intelligent cable shaft through the umbilical cable. |
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Communication methods |
The water surface equipment communicates with the intelligent cable shaft through the umbilical cable, and the intelligent cable shaft communicates with the deck unit through the wireless WIFI. |
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Total weight of equipment |
~16kg |
~21.5kg |
|
Software functional |
The sensor’s measurement frequency, time and mode have been configured, and the data can be displayed and stored. |
The sensor’s measurement frequency, time and mode have been configured, and the data can be displayed and stored. |
|
Tripod floating body |
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Component model |
EFloat-FH |
EFloat-FHP |
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Tripod floating body |
Carbon fiber material, ultra-light design, ultra-portable, fast installation, conical cover water depth adjustable |
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|
Unfold size fold size |
Φ1639×600（Height adjustable, minimum 500） Φ830×190×100 |
Φ1670×765（Height adjustable, minimum 665） Φ830×190×100 |
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Weight |
~3.56kg(not include integrated host） |
~4.5kg(not include integrated host） |
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General control host of water equipment |
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Component model |
EBOX-FH |
EBOX-FHP |
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General control host of water equipment |
Low power consumption and miniaturization, making it suitable for underwater work. An open interface and a built-in attitude sensor, enabling surface equipment operation, sensor data acquisition, power management and control security. |
|
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size |
Ф55mm×270mm |
Ф62×270mm |
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Maximum working water depth |
100m |
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Attitude sensor |
Three-axis attitude sensor, output angle range: x, z axis : ± 180 °, y axis : ± 90 ° |
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Angle accuracy: 0.05 degrees (static), 0.1 ° (dynamic) |
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Input voltage |
9-20V |
|
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Number field of channel(s) |
3 |
7 |
|
E-Spool Intelligent cable shaft of umbilical cable |
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|
Intelligent cable shaft of umbilical cable |
The device is characterized by its portability, miniaturization, low power consumption and intelligence. It features a 50 m zero buoyancy umbilical cable that can be used directly as a force cable; The smart cable shaft includes a built-in 12V30000mAh battery pack, power management display module, GPS module, long-distance umbilical cable power supply module and WIFI module. |
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|
Cable |
2×0.75mm+4 Core wire zero buoyancy cable |
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Battery |
30000mAh@12Vlithium battery |
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GPS |
Positioning accuracy 10m |
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Size |
380mm×330mm×490mm |
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Weight |
~9.6KG |
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|
Deck unit |
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Component model |
EDeckUnit-FH |
EDeckUnit-FHP |
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Deck unit |
ThinkPad notebook, supporting visualization software, real-time display and storage of surface incident spectral irradiance, water-leaving radiance, remote sensing reflectance results curve. |
ThinkPad notebook, supporting visualization software, real-time display and storage of surface incident spectral irradiance, water-leaving radiance, remote sensing reflectance, temperature, conductivity, chlorophyll curve. |
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Configuration |
R7 6850U 16G 512G |
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Hyperspectral irradiance meter |
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Component model |
RAMSES-ACC-VIS |
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Wavelength range |
320nm-950nm |
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Detector type |
256 Channel silicon photodiode array |
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Spectrum sampling |
3.3 nm/pixel |
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Spectral accuracy |
0.3nm |
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Available channels |
190 |
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Saturation threshold |
1000μW·cm-2·nm-1@400nm；800μW·cm-2·nm-1@500nm；1400μW·cm-2·nm-1@700nm @4ms integration time |
|
|
Typical Noise Equivalent Radiance |
0.4×10-4μW·cm-2·nm-1@400nm；0.4×10-4μW·cm-2·nm-1@500nm； 0.6×10-4μW·cm-2·nm-1@700nm @8s integration time |
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Optical incidence angle |
cosine |
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Measuring accuracy |
Better than 6%~10% |
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Integration time |
4ms-8s |
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Material |
stainless steel |
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Power supply |
8V-12V DC，≤0.85W |
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Size |
48mm*260mm(diameter*length) |
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Voltage-endurance |
30bar |
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Working temperature |
2℃~40℃ |
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Hyperspectral radiance meter |
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Component model |
RAMSES-ARC-VIS |
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Wavelength coverage |
320nm-950nm |
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Detector type |
256-Channel silicon photodiode array |
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Spectrum sampling |
3.3nm/pixel |
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Spectral accuracy |
0.3nm |
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Available channels |
190 |
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Saturation threshold |
100μW·cm-2·nm-1·sr-1@500nm @4ms integration time |
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Typical noise equivalent radiance |
0.25×10-4μW·cm-2·nm-1·sr-1@500nm @8s integration time |
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Optical incidence angle |
FOV: 7° in air |
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Measuring accuracy |
Better than 6% |
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Integration time |
4ms-8s |
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Material |
stainless steel |
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Power supply |
8V-12V DC，≤0.85W |
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Size |
48mm*300mm(diameter*length) |
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Voltage-endurance |
30bar |
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Working temperature |
2℃~40℃ |
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