Systems and methods for monitoring relative concentrations of di

Details Systems and methods for monitoring relative concentrations of di Systems and methods for monitoring relative concentrations of di

1996-12-10

1999-09-28

Lateef, Marvin M.

Surgery

Diagnostic testing

Respiratory

600532, 250345, 25033903, A61B 5097

Patent

active

059578580

ABSTRACT:
Method and system for measuring the relative concentrations of first and second isotopic forms of a chemical species within a sample. The present invention need not use a laser or high resolution spectrometer. The system typically includes a waveguide cell with good transmission of particular wavelengths of IR radiation, such as a hollow glass fiber waveguide cell. A source emits electromagnetic radiation, which is modulated at first and second wavelength bands that correspond to absorption bands of the first and second isotopic forms of the chemical species, respectively. In certain embodiments, the source is a filtered broad band source, such as a plurality of LEDs. In some embodiments, an FTIR spectrometer may serve as a filtered source and signal detector.

REFERENCES:
patent: 4830010 (1989-05-01), Marshall
patent: 5065025 (1991-11-01), Doyle
patent: 5284054 (1994-02-01), Loebach
patent: 5317156 (1994-05-01), Cooper et al.
patent: 5440664 (1995-08-01), Harrington et al.
patent: 5486699 (1996-01-01), Fabinski et al.

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