European Facility For Airborne Research

European Facility For Airborne Research April 6, 2020, 20:02

Instrument: Johnson-Williams probe

Name Johnson-Williams probe
Acronym Johnson-Williams
Manufacturer FAAM
Operated by FAAM
Operated onboard

Instrument type

Name Cloud Liquid Water Content
Acronym LWC

Principle of operation

Measured parameter Liquid water content
Operating principle

Hot wire instrument. Liquid contacts sample wire. Liquid evaporates, altering resistance of wire with comparison to control wire shielded against liquid
or
Nevzorov
or
Opto-electronic cloud physics probes.

Measurement(s) Clouds & Precipitation

Dimension and weight

External dimension JW Head - 155mm - max distance from skin
Weight 0.23

Performance

Operating mode In situ
Range

Resolution

Sensitivity

Accuracy

Bandwidth

Modifications

Operational restriction

Operational requirements

Access to free air flow

Certification approvals

Approved by CAA for use on BAe 146-301.

Additional information

Access, host and processing

Access

Available from Met Office/FAAM

Could also fit on any aircraft having the following characteristics

General description

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