Methods and apparatus for normalizing path length in non-invasive glucose monitoring
US9759714B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2016 |
| Grant date | Sep 12, 2017 |
| Priority date | — |
| Expiry date | Feb 24, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/6815
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods and apparatus for normalizing path length in an optical system for non-invasive glucose concentration. A method arrangement includes providing an optical energy source spaced from a first photo-detector by a sensing area; transmitting energy from the optical energy source onto the first photo-detector; storing a first reading corresponding to the light intensity observed by the first photo-detector; subsequently, introducing a container of solution including an optically active substance into the sampling area; transmitting energy from the optical energy source through the container in the sampling area and onto the first photo-detector; storing a second reading corresponding to the light intensity observed by the first photo-detector; determining a ratio of the first reading to the second reading; and determining a path length L by computing L=ln(ratio)/μ where μ is an absorption constant of the optical energy in the solution and container. Additional arrangements are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.