05348003 is referenced by 337 patents and cites 12 patents.

A method and apparatus for determining the presence of an analyte in a medium or the composition of a medium wherein a volume of material is irradiated with temporally-modulated electromagnetic energy at multiple wavelengths. The electromagnetic radiation is detected after it has traversed a portion of the material. Representation signals related to the degree of absorption of electromagnetic energy at various wavelengths in the material and signals related to the path lengths travelled by the electromagnetic radiation in the material are generated, and signals representative of the optical absorption per unit path length at various wavelengths in the medium are derived. The derived wavelength dependence of the optical absorption per unit path length is compared with a calibration model, and the comparison is analyzed to derive concentrations of specific chemical species within the material and the presence of an analyte or composition of the medium. An output indicative of the concentration and composition is then provided.

Title
Method and apparatus for chemical analysis
Application Number
7/940188
Publication Number
5348003
Application Date
September 3, 1992
Publication Date
September 20, 1994
Inventor
Richard G Caro
San Francisco
CA, US
Agent
Flehr Hohbach Test Albritton & Herbert
Assignee
Sirraya
CA, US
IPC
A61B 5/00
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