HR: 1340h
AN: A33B-0890    [Abstracts]
TI: LISST-WING: A New Laser Diffraction Instrument for Cloud Size Distribution and Concentration Research
AU: * Agrawal, Y C
EM: yogi.agrawal@sequoiasci.com
AF: Sequoia Scientific, Inc., 2700 Richards Road, Bellevue, WA 98005 United States
AU: Jonsson, H
EM: hjonsson@nps.navy.mil
AF: CIRPAS, 3240 Imjin Rd., Hanger #510, Marina, CA 93933 United States
AU: Buzorius, G
EM: gbuzoriu@nps.navy.mil
AF: CIRPAS, 3240 Imjin Rd., Hanger #510, Marina, CA 93933 United States
AB: We describe the technology and first in-situ measurements in clouds from a laser diffraction instrument, LISST-WING. The instrument was developed as an SBIR project funded by ONR. Laser diffraction techniques offer the advantage of near-instant measurement of size spectra and concentration as it is based on multi-angle scattering of laser light from an ensemble of droplets contained in a 1 cm diameter, 15 cm long beam. The multi-angle scattering is inverted to obtain the size distribution, which produces the concentration or liquid water content from its sum. The size bins of this device are equally spaced in log(diameter), unlike prior technologies. The large volume of particles sensed per measurement (45 litres/sec at 60 knots) enables stable statistics. A size range from 2 micron to 400 micron is covered by the present instrument. The data are stored on board and downloaded at convenience. In summer 2005 the prototype was test-flown at the CIRPAS facility in Marina, California. High temporal resolution data were obtained. In this paper, these data will be described and compared with data where available from prior sensors installed on the CIRPAS research aircraft.
UR: http://www.sequoiasci.com
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0319 Cloud optics
DE: 0320 Cloud physics and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005