Fast Response Sensor for the Measurement of the Optical Properties and Carbon Content of Organic Aerosols

Period of Performance: 08/03/2001 - 08/02/2003

$846K

Phase 2 SBIR

Recipient Firm

Droplet Measurement Technologies, Inc.
2545 Central Avenue
Boulder, CO 80301
Principal Investigator

Abstract

In the Phase I study, a protype instrument, the aerosol vaporization spectrometer (AVS)was evaluated for the ability to classify airborne aerosol particles by their incandescent signal. The instrument uses a diode pumped Nd:YAG laser at 1.06 u wavelength to excite the particles. The scattering signal is monitored from all particles, and black carbon particles absorb sufficient energy to incandesce, and this incandescence is measured by broadband and narrowband detectors. Particles other than black carbon will not incandesce, and they are identified by their scattering signal. The mass of the black carbon particles is directly related to the intensity of the incandescence signal. From the ratio of the scattering to the incandescence signals, it appears possible to obtain information on the shape of the particles. In the Phse II work, further testing will be done on this instrument, and a rugged field ready unit will be constructed.