European Facility For Airborne Research

European Facility For Airborne Research May 29, 2023, 21:30

Instrument: DLR Lyman Alpha L-5

Name DLR Lyman Alpha L-5
Acronym Buck-LA-DLR
Manufacturer Buck Research
Manufacturer website
Operated by DLR
Operated onboard

Instrument type

Name Non dew/frost point hygrometer
Acronym Other hygrometer

Principle of operation

Measured parameter Water Vapour, Relative Humidity
Operating principle

The MOZAIC-Humidity Device (MHD) is a special airborne humidity sensing device (AD-FS2), developed by Aerodata (Braunschweig, Germany) and based on the humidity and temperature transmitter HMP230 of Vaisala (Helsinkin, Finnland). The sensing element itself is a combination of a capacitive relative humidity sensor (Humicap-H, Vaisala) and a Pt100 temperature sensor which has been installed in a Rosemount housing mounted on the outside skin of the aircraft in the vicinity of the nose cone.

Measurement(s) Thermodynamics

Dimension and weight

External dimension Permanently installed
Weight 3.0


Operating mode In situ






Operational restriction

Permanently installed; needs periodic calibration; measurements within clouds can be erroneous due to droplet evaporation within the inlet

Operational requirements

Permanently installed

Certification approvals

Certified only for FA20-DLR

Additional information

Water Vapour by Lyman-Alpha. Permanently installed on FA20-DLR.

Access, host and processing


Permanently installed

Could also fit on any aircraft having the following characteristics

General description

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