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RPG - Model LWP -Liquid Water Path Radiometers
These radiometers are used for the remote sensing of integrated water vapor (IWV) and Liquid Water Path (LWP). Both quantities give column-integrated (total) values rather than vertically resolved profiles.
- Liquid water path (LWP) measurements
- Integrated water vapour (IWV) measurements
- Attenuation monitoring
- Beacon experiments
- Cloud observations
- Climate monitoring
- Satellite tracking (GPS, Galileo)
The RPG-LWP model is the standard two-channel microwave radiometer typically used for this purpose. Upgraded versions (RPG-LWP-U90, RPG-LWP-U150, RPG-LWP-U72+88) extend the sensitivity to small amounts of LWP (e.g., thin clouds) by adding one or two higher frequency channels. High-frequency two channel versions (RPG-LWP-90-150) are optimised for thin cloud and snow observation. For observation of thick clouds and rain we recommend the dual-polarized Rain Radiometer (LWP-Rain).
- Network capability through Ethernet Interface
- High spatial resolution due to small beam widths (
- High temporal resolution: filter bank receiver produces one observation per second
- Absolute system stability: 0.5 K
- Receiver and antenna thermal stabilization: < 0.02 K
- Operating temperature range: –40°C to +45°C
- Automatic rain-mitigation system: hydrophobic coating and strong blower for rain, heater module with 1.8 kW preventing formation of dew and fog condensation on radome.
- Integrated PC on-board
- Comprehensive operating software included (free updates)
- Full internal retrieval algorithm, retrieval data and raw data output
- GPS clock and receiver
- Additional external meteorological sensors: barometric pressure, humidity, temperature, wind (direction and speed), rain rate
- IR-radiometer option for ice cloud detection
- Azimuth positioner option for full sky scanning: 350 observations of IWV, LWP, IR temperature in less than 6 minutes
- North-alignment by software feature (sun-tracking plus GPS, only with azimith positioner)
- Fiber-optical data cable for lightning protection and secure data transmission (maximum length 1600 m)
- Customized retrieval software available
- Stand alone operation
- Data storage and backup on-board, power-failure safe-guard
- Low maintenance (6 months intervall for absolute calibration using LN2)
- Automatic calibration with sky-tipping (software controlled)
- Power supply: 100 – 240 V AC (at 47 – 63 Hz)
- Power consumption:
- Weight: 60 kg (without dew blower)
- Dimensions: 63 × 40 × 90 cm (H × W × L, without stand)
- Low cost!
channels at 23.8, 31.4, 72.5, 82.5, 90, 150, 225, 350, 448, 664 GHz
Retrieved data types:
- Liquid Water path (LWP)
- Integrated Water Vapor (IWV)
- wet delay
- dry delay