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Spectroscopic detection

United States Patent

January 21, 2003
View the Complete Patent at the US Patent & Trademark Office
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.
Woskov; Paul P. (Bedford, MA), Hadidi; Kamal (Cambridge, MA)
Massaschusetts Institute of Technology (Cambridge, MA)
09/ 572,277
May 17, 2000
This invention was made with government support under Grant Number DE-FG07-98ID13601 awarded by the U.S. Department of Energy. The government has certain rights in the invention.