Near normal incidence optical assaying method and system having wavelength and angle sensitivity
US6100991A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1999 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | Jun 22, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S436/807
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and system for optically assaying a substance in a sample using a sensing system having a diffraction grating sensor. A system and method are described that expose the sensor with a light beam at near normal angles of incidence and quantitatively measure the concentration of targeted substance by determining the angular separation between resulting anomaly angles. The present invention also contemplates a system and method that quantitatively measure the concentration of targeted substance by determining the wavelength separation between resulting anomaly wavelengths. Advantages of the present invention include increased sensitivity and less susceptibility to system drifts due to mechanical motion and thermal changes than conventional diffraction grating sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.