Composition measurement of aerosols of submicrometer particles by phase fluctuation absorption spectroscopy

Journal Article · Sat Jun 01 04:00:00 EDT 1985 · Appl. Opt.; (United States)

DOI:https://doi.org/10.1364/AO.24.001668· OSTI ID:5561391

Fluckiger, D U; Lin, H; Marlow, W H

Phase fluctuation optical heterodyne spectroscopy is employed to obtain the first nonextractive data on size-mass distribution of submicrometer ammonium sulfate aerosols. The required theory of aerosol absorption of electromagnetic energy and subsequent thermalization is presented. Based on this theory, the predicted behavior was confirmed by experiments using IR absorption of ammonium sulfate aerosols. The results show good agreement with measurements using conventional methods including condensation nuclei counter, electron micrography, and filtration. In addition, a conversion constant for the photothermal signal of ammonium sulfate aerosols is calculated to be 2.3 ..mu..V/( ..mu..g/m/sup 3/). Furthermore, the signal is shown to be linear in excitation energy and modulation frequency and scalable.

• Research Organization: MIT Lincoln Laboratory, Lexington, Massachusetts 02173
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5561391
• Journal Information: Appl. Opt.; (United States), Journal Name: Appl. Opt.; (United States) Vol. 24:11; ISSN APOPA
• Country of Publication: United States
• Language: English

Related Subjects

440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ABSORPTION
ABSORPTION SPECTROSCOPY
AEROSOLS
AMMONIUM COMPOUNDS
AMMONIUM SULFATES
CALIBRATION
COLLOIDS
DISPERSIONS
DISTRIBUTION
ELECTRONIC EQUIPMENT
ENERGY ABSORPTION
ENERGY LOSSES
EQUIPMENT
FLUCTUATIONS
HETERODYNE RECEIVERS
INFRARED SPECTRA
INFRARED SPECTROMETERS
LOSSES
MASS DISTRIBUTION
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
OPTICAL SPECTROMETERS
OXYGEN COMPOUNDS
PARTICLE SIZE
PERFORMANCE
RADIO EQUIPMENT
SENSITIVITY
SIZE
SOLS
SPATIAL DISTRIBUTION
SPECTRA
SPECTROMETERS
SPECTROSCOPY
SULFATES
SULFUR COMPOUNDS
TABLES
VARIATIONS