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Title: 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 National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
6175764
Patent Number(s):
7148328
Application Number:
ON: DE89010897
Assignee:
Dept. of Energy
Patent Classifications (CPCs):
C - CHEMISTRY C12 - BIOCHEMISTRY C12Q - MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS
A - HUMAN NECESSITIES A61 - MEDICAL OR VETERINARY SCIENCE A61K - PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
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. https://www.osti.gov/servlets/purl/6175764.
@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}
}