Optics: measuring and testing – With sample preparation – Depositing particles on optical surface
Reexamination Certificate
2006-05-02
2006-05-02
Pham, Hoa Q. (Department: 2877)
Optics: measuring and testing
With sample preparation
Depositing particles on optical surface
C356S446000, C356S437000
Reexamination Certificate
active
07038765
ABSTRACT:
For optically measuring black carbon in the atmosphere an aerosol particle collection area of a filter tape is continually illuminated by an illumination source with light of one or more wavelengths. Transmitted and reflected light fractions are measured at several precisely defined angles or angle ranges, such as of 0°, 120 to 140° and 165° to 180° by photodetectors arranged correspondingly relative to the illumination source, achieving maximum symmetry for the angles to be measured. The loading of the filter tape collection area with light absorbing aerosol material is continually determined from the change in the optical properties of the collection area with the aid of known algorithms from transmissivities and reflectivities as detected.
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Petzold Andreas
Schönlinner Markus
Collard & Roe P.C.
Deutsches Zentrum für Luft- und Raumfahet e.V.
ESM Andersen Instruments GmbH
Pham Hoa Q.
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