Analyzing spectrometric data
US6029115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1997 |
| Grant date | Feb 22, 2000 |
| Priority date | — |
| Expiry date | Sep 30, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/2866
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A spectrometric instrument includes a detector with detecting subarrays on small portions of the surface. Spectral data are acquired for selected subarrays at a first time for a drift standard, and compared to a zero position to obtain first offset data. Data are acquired similarly at a second time to obtain second offset data. The offset data are utilized to obtain a spectral shift for any subarray position at any selected time. The shift is applied to a matrix model used for converting test data to compositional information. Archive data for the model is obtained in the foregoing manner, using slit scanning in the instrument to achieve sub-increments smaller than the detector pixel size, with a procedure to assure that there is an integral number of scanning steps across one pixel. The drift standard may be chemical analytes, or an optical interference element producing fringes related to spectral positions in each subarray. A procedure is used to identify the fringe peaks to spectral position, with temperature correction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.