Above-water Rrs
Interleaves downwelling irradiance, sky radiance, and sea-surface radiance with dark-current auto-calibration
mHR-2
Measures the above-water Rrs a satellite estimates, from the surface and free of the atmosphere
The only instrument in the lineup that carries no laser. A motorised head cycles through downwelling irradiance, sky radiance, sea-surface radiance, and a dark reading, returning Rrs across 320–880 nm. Reading from the surface leaves the atmosphere out of the retrieval, which is what makes the number usable as a satellite match-up. Developed in the OQOMETHI project and field-tested with ESA at Venice in 2025.
Channels 3 Ed·Ls·Lt
Range 320–880 nm
Mass 0.9 kg
Output Rrs
Measures
What it measures
Each parameter is resolved through its own optical process
Satellite match-up
Derives the same Rrs a satellite estimates, for cal/val pairing alongside the active LIF measurement
Sun-glint rejection
The 40° sky and 140° sea-surface geometry, both from zenith, minimises surface glint
Autonomous operation
Runs unattended with automatic upload to cloud storage
Deployment platforms
Custom mounts and integration on request
Vessel
Deck or rail mount
▸ Underway or on stationSmall vessel / RIB
RIB-class deployment
▸ Shallow and nearshore workPier / bridge
Fixed above-water mount
▸ Unattended, cabled or batteryMoored buoy
Long-duration mooring
▸ Telemetry, low duty cycleFixed coastal station
Permanent installation
▸ All-weather, IP68Specifications
Full PDF datasheet on request
Optical
Channels
3, Ed, Ls, Lt
Output
Rrs (remote-sensing reflectance)
Wavelength range
320–880 nm
Spectral resolution
7 nm
Radiance FOV
1°
Electronics
ADC
12-bit
Integration time
270 µs – 1 s
Comms
RS485 / Wi-Fi / onboard logging
Mechanical
Size / mass
132 × 125 × 106 mm, 0.9 kg
Protection
IP68
Electrical
Power
12 V DC, 12 W peak
Contact
Enquire about the mHR-2
Pricing, integration support, and quotes come from the engineering team directly, usually within two working days