The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 2012
Filed:
Jun. 24, 2010
Richard K. Defreez, Azalea, OR (US);
Michael A. Potter, Wilderville, OR (US);
Thomas L. Pottberg, Grants Pass, OR (US);
Richard K. DeFreez, Azalea, OR (US);
Michael A. Potter, Wilderville, OR (US);
Thomas L. Pottberg, Grants Pass, OR (US);
Met One Instruments, Inc., Grants Pass, OR (US);
Abstract
A nephelometer for detecting the concentration of particulates in a sample aerosol is provided with a branched flow path with a sample aerosol input, a clean gas input and an output leading to an optical sensor unit. At least one of the inputs has periodic variable flow so that a concentration-modulated gas stream is supplied to the optical sensor unit. The detector output of the sensor unit is processed in synchrony with the concentration modulation to filter out DC components, such as 1/f noise and parasitic instrument noise.