European Facility For Airborne Research

European Facility For Airborne Research May 29, 2022, 11:27

Instrument: INTA Forward Scattering Spectrometer Probe 100-ER

Name INTA Forward Scattering Spectrometer Probe 100-ER
Acronym FSSP-100ER-INTA
Manufacturer Particle Measuring Systems
Operated by INTA
Operated onboard

Instrument type

Name Cloud Droplet Size Spectrometer
Acronym Cloud Droplet Spectrometer

Principle of operation

Measured parameter Cloud droplet size spectra, number concentration and water content,
Operating principle

Optical probe. Cloud droplets pass through sample volume, where they scatter a laser beam. Scattered light picked up by detectors allowing size to be determined. Bulk quantities such as total droplet number concentrations, liquid water content, or effective droplet radius can be derived.
Other opto-electronic cloud microphysics probe

Measurement(s) Clouds & Precipitation

Dimension and weight

External dimension 40in L * 7in diameter (101,6 cm * 17,8 cm diameter)
Weight 20.0


Operating mode In situ






Operational restriction

Operational requirements

Power: 115V, 50 to 400 Hz, less than 1 amp
De-Icing Power: 28 V, 320 W
levels with line drivers/receivers. Data latched for minimum of 4 µsec.
Environmental: Temperature (-40°ree; - +40°ree;C)
Altitude (0 to 40.000 feet- 0 to 12.2 km)
Humidity (0 to 100 % RH)

Certification approvals

Additional information

Laser Model number: LB/5T/1M-B
Laser Serial Number: PMS-2725P-2896
Laser replacement Part Number: METK0004
Depth of field: 2.30 mm
Beam Width: 0.234 mm
Total Sample Area before Velocity reject: 0.538 mm2
Acceptance Ratio: Total Counts/Total Strobes % (nominal 0.56)
Effective Sampling Area: Acceptance Ratio*Total Sample Area (nominal 0.300
Sampling Volume: Effective Sampling Area*Velocity

Access, host and processing


Contact INTA

Could also fit on any aircraft having the following characteristics

General description

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