Method and apparatus for determining analyte concentration using phase and magnitude detection of a radiation transfer function
US6580934B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2000 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | Mar 30, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/35
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus of determining the analyte concentration of a test sample is described. A temperature gradient is introduced in the test sample and infrared radiation detectors measure radiation at selected analyte absorbance peak and reference wavelengths. The modulation of the temperature gradient is controlled by a surface temperature modulation. A transfer function is determined that relates the surface temperature modulation to the modulation of the measured infrared radiation. Reference and analytical signals are detected. In the presence of the selected analyte, phase and magnitude differences in the transfer function are detected. These phase and magnitude differences, having a relationship to analyte concentration, are measured, correlated, and processed to determine analyte concentration in the test sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.