Aethalometer

专利名称：Aethalometer发明人：Anthony D. Hansen申请号：US07/148328申请日：19880125公开号：US04893934A公开日：19900116

摘要：An improved aethalometer (10) having a single light source (18) and a singlelight detector (20) and two light paths (21, 22) from the light source (18) to the lightdetector (20). A quartz fiber filter (13) is inserted in the device, the filter (13) having acollection 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 toflow through the collection area (23) of the filter (13) so that aerosol particles can becollected on the filter. A rotating disk (31) with an opening (33) therethrough allows lightfor the light source (18) to pass alternately through the two light paths (21, 22). Thevoltage output of the detector (20) is applied to a VCO (52) and the VCO pulses for lighttransmission separately through the two light paths (21, 22 ) are counted and comparedto determine the absorption coefficient of the collected aerosol particles.

申请人：THE UNITED STATES OF AMERICA AS REPRESENTED BY THE UNITED STATESDEPARTMENT OF ENERGY

代理人：Clifton E. Clouse,Roger S. Gaither,William R. Moser

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