Improved aethalometer

Patent · Mon Jan 25 04:00:00 EST 1988

OSTI ID:6175764

Hansen, A. D.

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.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• Assignee: Dept. of Energy
• Patent Number(s): PATENTS-US-A7148328
• Application Number: ON: DE89010897
• OSTI ID: 6175764
• Country of Publication: United States
• Language: English

Related Subjects

440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOL MONITORING
AIR POLLUTION MONITORING
AIR POLLUTION MONITORS
CARBON
DESIGN
ELEMENTS
EQUIPMENT
INVENTIONS
MEASURING INSTRUMENTS
MONITORING
MONITORS
NONMETALS
OPTICAL EQUIPMENT
PARTICLES
SOOT