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Title: Aethalometer

Abstract

An improved aethalometer (10) having a single light source (18) and a single light detector (20) and two light paths (21, 22) from the light source (18) to the light detector (20). A quartz fiber filter (13) is inserted in the device, the filter (13) having a collection area (23) in one light path (21) and a reference area (24) in the other light path (22). A gas flow path (46) through the aethalometer housing (11) allows ambient air to flow through the collection area (23) of the filter (13) so that aerosol particles can be collected on the filter. A rotating disk (31) with an opening (33) therethrough allows light for the light source (18) to pass alternately through the two light paths (21, 22). The voltage output of the detector (20) is applied to a VCO (52) and the VCO pulses for light transmission separately through the two light paths (21, 22 ) are counted and compared to determine the absorption coefficient of the collected aerosol particles.

Inventors:
 [1]
  1. Berkeley, CA
Issue Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
867244
Patent Number(s):
4893934
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
aethalometer; improved; 10; single; light; source; 18; detector; 20; paths; 21; 22; quartz; fiber; filter; 13; inserted; device; collection; 23; path; reference; 24; gas; flow; 46; housing; 11; allows; ambient; air; aerosol; particles; collected; rotating; disk; 31; 33; therethrough; pass; alternately; voltage; output; applied; vco; 52; pulses; transmission; separately; counted; compared; determine; absorption; coefficient; single light; light transmission; aerosol particle; aerosol particles; voltage output; ambient air; gas flow; light source; flow path; absorption coefficient; light detector; light paths; rotating disk; light path; quartz fiber; fiber filter; /356/

Citation Formats

Hansen, Anthony D. Aethalometer. United States: N. p., 1990. Web.
Hansen, Anthony D. Aethalometer. United States.
Hansen, Anthony D. Mon . "Aethalometer". United States. https://www.osti.gov/servlets/purl/867244.
@article{osti_867244,
title = {Aethalometer},
author = {Hansen, Anthony D},
abstractNote = {An improved aethalometer (10) having a single light source (18) and a single light detector (20) and two light paths (21, 22) from the light source (18) to the light detector (20). A quartz fiber filter (13) is inserted in the device, the filter (13) having a collection area (23) in one light path (21) and a reference area (24) in the other light path (22). A gas flow path (46) through the aethalometer housing (11) allows ambient air to flow through the collection area (23) of the filter (13) so that aerosol particles can be collected on the filter. A rotating disk (31) with an opening (33) therethrough allows light for the light source (18) to pass alternately through the two light paths (21, 22). The voltage output of the detector (20) is applied to a VCO (52) and the VCO pulses for light transmission separately through the two light paths (21, 22 ) are counted and compared to determine the absorption coefficient of the collected aerosol particles.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}