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Abstract

An apparatus and method for testing the glucose level in a blood sample is provided. The method includes the step of initially filtering a sample of blood to be tested. A beam of light is provided and split into a pair of beams by a beam splitter. The pair of beams travel along generally parallel paths. One path contains a cell of a known optical pathlength and additionally a compensator. The other path has a cell containing the filtered blood sample to be tested. The pair of beams are then recombined by a mirror and a fringe pattern is detected at a detector. From the fringe pattern, the refractive index of the blood sample can be calculated. The refractive index is easily converted to a specific glucose concentration. Alternatively, the original fringe pattern can be restored by changing the effect of the compensator. The refractive index can then be found from the required compensation.

Patent Number

5,168,325

Assignee

Board of Control of Michigan Technological University, Houghton, Mich.

Application Number

486,242

Date Filed

2-28-1990

Certificate of Correction

No

Issue Date

12-1-1992

Disciplines

Engineering

Interferometric measurement of glucose by refractive index determination

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Engineering Commons

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