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:
Jan. 21, 2003
Filed:
May. 17, 2000
Applicant:
Inventors:
Paul P. Woskov, Bedford, MA (US);
Kamal Hadidi, Cambridge, MA (US);
Assignee:
Massaschusetts Institute of Technology, Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J 3/02 ; G01J 3/28 ;
U.S. Cl.
CPC ...
G01J 3/02 ; G01J 3/28 ;
Abstract
In embodiments, spectroscopic monitor monitors modulated light signals to detect low levels of contaminants and other compounds in the presence of background interference. The monitor uses a spectrometer that includes a transmissive modulator capable of causing different frequency ranges to move onto and off of the detector. The different ranges can include those with the desired signal and those selected to subtract background contributions from those with the desired signal. Embodiments of the system are particularly useful for monitoring metal concentrations in combustion effluent.