Aethalometer
Patent
·
OSTI ID:6538774
This patent describes 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.
- Assignee:
- Dept. of Energy, Washington, DC (USA)
- Patent Number(s):
- US 4893934; A
- Application Number:
- PPN: US s 7-148328
- OSTI ID:
- 6538774
- Country of Publication:
- United States
- Language:
- English
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