Method and apparatus for aerosol particle absorption spectroscopy
- Nesconset, NY
- Manorville, NY
A method and apparatus 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.
- Research Organization:
- Associated Universities, Inc., Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4415265
- Application Number:
- 06/277,442
- OSTI ID:
- 864783
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
apparatus
aerosol
particle
absorption
spectroscopy
determining
spectra
properties
particles
heating
beam
source
provides
electromagnetic
energy
scanned
region
spectrum
exposed
bands
band
width
absorb
illuminated
light
wave
length
scattered
determined
analysis
affect
preferably
modulated
simplify
embodiment
intensity
passes
interferometer
reflects
fourier
transform
wave length
absorption band
intensity modulated
source provides
aerosol particle
heating beam
beam passes
aerosol particles
scattered light
fourier transform
electromagnetic energy
beam source
absorption spectra
magnetic energy
absorption bands
band width
particles absorb
absorption spectroscopy
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