Improved aethalometer
Abstract
An improved aethalometer having a single light source and a single light detector and two light paths from the light source to the light detector. A quartz fiber filter is inserted in the device, the filter having a collection area in one light path and a reference area in the other light path. A gas flow path through the aethalometer housing allows ambient air to flow through the collection area of the filter so that aerosol particles can be collected on the filter. A rotating disk with an opening therethrough allows light for the light source to pass alternately through the two light paths. The voltage output of the detector is applied to a VCO and the VCO pulses for light transmission separately through the two light paths, are counted and compared to determine the absorption coefficient of the collected aerosol particles. 5 figs.
- Inventors:
- Issue Date:
- Research Org.:
- Lawrence Berkeley Lab., CA (USA)
- OSTI Identifier:
- 6175764
- Patent Number(s):
- -US-A7148328
- Application Number:
- ON: DE89010897
- Assignee:
- Dept. of Energy LBNL; EDB-89-072982
- DOE Contract Number:
- AC03-76SF00098
- Resource Type:
- Patent
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; 47 OTHER INSTRUMENTATION; AIR POLLUTION MONITORS; DESIGN; AEROSOL MONITORING; CARBON; INVENTIONS; OPTICAL EQUIPMENT; PARTICLES; SOOT; AIR POLLUTION MONITORING; ELEMENTS; EQUIPMENT; MEASURING INSTRUMENTS; MONITORING; MONITORS; NONMETALS; 500200* - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989); 440300 - Miscellaneous Instruments- (-1989)
Citation Formats
Hansen, A.D. Improved aethalometer. United States: N. p., 1988.
Web.
Hansen, A.D. Improved aethalometer. United States.
Hansen, A.D. Mon .
"Improved aethalometer". United States.
@article{osti_6175764,
title = {Improved aethalometer},
author = {Hansen, A.D.},
abstractNote = {An improved aethalometer having a single light source and a single light detector and two light paths from the light source to the light detector. A quartz fiber filter is inserted in the device, the filter having a collection area in one light path and a reference area in the other light path. A gas flow path through the aethalometer housing allows ambient air to flow through the collection area of the filter so that aerosol particles can be collected on the filter. A rotating disk with an opening therethrough allows light for the light source to pass alternately through the two light paths. The voltage output of the detector is applied to a VCO and the VCO pulses for light transmission separately through the two light paths, are counted and compared to determine the absorption coefficient of the collected aerosol particles. 5 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}