Stratton Park Engineering Company Inc

SPEC operates an instrumented Learjet 25 aircraft for cloud physics research. Photographs of the SPEC Learjet and sensors are shown below. A table to the right lists characteristics of the research instrumentation. The Learjet has participated in several field projects (e.g., NASA TRMM, NASA EOS validation, NSF wave cloud studies, Alliance Icing Research Study in Ottawa, data collection at the SGP CART site for DOE and CSU CLEX) and it is a well-established research aircraft.

SPEC Learjet 25 Sensors and Manufacturers

Equipment List
Temperature	Rosemount Model 102 & 510BH Amplifier
Dew Point	Buck Research CR-1A
Altitude	Rosemount 1201
Airspeed	Rosemount 1221
Cloud Liquid Water	PMS - CSIRO KLWC-100
Cloud Liquid Water	Sky Tech Nevzorov LWC Probe
Cloud Total Water	Sky Tech Nevzorov TWC Probe
Aircraft Position	Garmen model GPS-92
Aircraft Heading	Learjet Sperry Directional Gyro
Cloud Particle Size Spectra and Imaging	Forward Scattering Spectrometer PMS Model FSSP-100 (3.5 microns to 45 microns). No Imaging Available.
	PMS Model OAP-2D-C (33 microns to 1.0 mm)
	SPEC 2D-Stereo Probe (10 microns to 1.2 mm)
	SPEC Cloud Particle Imager (CPI) version 2 (7 microns to 2.4 mm)
	SPEC High Volume Precipitation Spectrometer (HVPS) (200 microns to 4 cm)
Cloud Boundaries	*SPEC In Situ* Cloud Lidar (532 nm l)**
Optical Cloud Extinction Meter	SPEC Cloud Extinctiometer (0.4 to 2.3 micron l)

Data Acquisition Systems

One data acquisition system is built by Science Engineering Associates (SEA) and is based on a Pentium PC. The CPI and the 2D-Stereo each have a dedicated data system that also ingests a serial data stream of computed parameters from the SEA data system, so that all data streams are synchronized in time. There are three flat-panel displays on the aircraft, two are visible from the cabin and one is visible from the cockpit.

Scientific Findings from Lear Flights

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SPEC Inc.
3022 Sterling Circle, Suite 200
Boulder, CO 80301. USA
Phone 303-449-1105 Fax 303-449-0132