Method and apparatus for aerosol-particle absorption spectroscopy. [DOE patent application]
A method and apparatus are described for determining the absorption spectra, and other properties, of aerosol particles. A heating beam source provides a beam of electromagnetic energy which is scanned through the region of the spectrum which is of interest. Particles exposed to the heating beam which have absorption bands within the band width of the heating beam absorb energy from the beam. The particles are also illuminated by light of a wave length such that the light is scattered by the particles. The absorption spectra of the particles can thus be determined from an analysis of the scattered light since the absorption of energy by the particles will affect the way the light is scattered. Preferably the heating beam is modulated to simplify the analysis of the scattered light. In one embodiment the heating beam is intensity modulated so that the scattered light will also be intensity modulated when the particles absorb energy. In another embodiment the heating beam passes through an interferometer and the scattered light reflects the Fourier Transform of the absorption spectra.
- DOE Contract Number:
- AC02-76CH00016
- Assignee:
- Dept. of Energy
- Application Number:
- ON: DE82011771
- OSTI ID:
- 5181093
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AEROSOLS
ABSORPTION SPECTROSCOPY
MONITORING
DESIGN
ELECTROMAGNETIC RADIATION
EQUIPMENT
FOURIER TRANSFORMATION
INTERFEROMETERS
PARTICULATES
COLLOIDS
DISPERSIONS
INTEGRAL TRANSFORMATIONS
MEASURING INSTRUMENTS
PARTICLES
RADIATIONS
SOLS
SPECTROSCOPY
TRANSFORMATIONS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)