Optics: measuring and testing – For light transmission or absorption – By comparison
Reexamination Certificate
2011-06-07
2011-06-07
Lauchman, L. G (Department: 2877)
Optics: measuring and testing
For light transmission or absorption
By comparison
C250S345000
Reexamination Certificate
active
07957001
ABSTRACT:
In one embodiment of the spectroscopy method, the method comprises the steps of modulating the wavelength of a monochromatic radiation at a modulation amplitude and a modulation frequency; determining a first variable representative of an absorbance of an analyte in a sample; and demodulating by phase-sensitive detection the first variable at a harmonic of the modulation frequency to produce a harmonic spectrum of the analyte. In one embodiment of the spectroscopy apparatus, the apparatus comprises a laser diode integrated with a first photodetector configured to detect an intensity of a backward emission from the laser diode and act as a reference detector; a second photodetector configured to detect an intensity of laser radiation exiting a sample; and electronic circuitry coupled to the laser diode and the photodetectors, configured to acquire and process spectra of the sample. In another embodiment, the spectroscopy apparatus comprises a beam splitter configured to split the laser radiation into a first radiation portion and a second radiation portion and a first photodetector configured to detect the intensity of the first radiation portion.
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Berkowitz Gene Smith
Gambuzza Michael J.
Huang Yufeng
Kowal Anthony
Li Hejie
Conklin Mark A.
GE Infrastructure Sensing Inc.
Global Patent Operation
Lauchman L. G
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