mHR-2

Above-water Rrs measurements for satellite comparison and water-colour monitoring

The mHR-2 is a passive radiometer with one motorised head for downwelling irradiance, sky radiance, sea-surface radiance, and dark-current measurements. Each cycle returns Rrs across 320–880 nm together with position, attitude, and a context image. The instrument was developed through OQOMETHI and field-tested during ESA's PHY2FLEX campaign in Venice in 2025.

Open datasheet (PDF) View specifications

Measures

Measurement channels

The instrument combines its angular measurement sequence into a single Rrs record

Above-water Rrs

Combines downwelling irradiance, sky radiance, and sea-surface radiance with a dark-current measurement in each cycle

Process: Passive radiometry
Range: 320–880 nm

Satellite match-up

Returns Rrs for synchronous comparison with satellite observations and active LIF measurements

Process: Passive radiometry

Sun-glint rejection

Uses the standard 40° sky and 140° sea-surface viewing geometry, measured from zenith, to minimise sun glint

Process: AWR viewing geometry

Autonomous operation

Runs unattended and can upload measurement records automatically for remote review

Process: Unattended, with cloud upload

Platforms

Compatible deployment platforms

Mounting and integration are specified for the instrument and survey method

Vessel

Deck or rail installation

Measurements underway or on station

Small vessel / RIB

Compact rail installation

Shallow-water and nearshore surveys

Pier / bridge

Fixed above-water installation

Unattended operation on mains or battery power

Moored buoy

Long-duration above-water installation

Telemetry with a configurable duty cycle

Fixed coastal station

Permanent above-water installation

Long-term monitoring in exposed conditions

Datasheet

Specifications

Open datasheet (PDF)

Optical

Channels

3, Ed, Ls, Lt

Output

Rrs (remote-sensing reflectance)

Wavelength range

320–880 nm

Spectral resolution

12 nm FWHM, 288 bands

Radiance FOV

1°

Electronics

ADC

12-bit

Integration time

270 µs – 1 s

Auxiliary sensors

GPS / IMU / context camera

Comms

RS485 / Wi-Fi / internal logging

Mechanical

Size / mass

132 × 125 × 106 mm, 0.9 kg

Protection

IP68

Electrical

Power

12 V DC, 10 W peak

Contact

Discuss a mHR-2 deployment

The engineering team handles quotations, mounting requirements, and integration questions

info@lifelidar.com +33 7 80 72 60 72 Sophia Antipolis, Valbonne, France