Time-resolved Fourier-transform optical spectroscopy utilizing in-phase and quadrature cyclic perturbation data values
US5450196A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1994 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Aug 11, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/447
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In FT-DIRLD (Dynamic Infra Red Linear Dichroism) apparatus partly represented in FIG. 1, units 100-105, responding to interferometer output IB (indicated elsewhere), cause unit 106 to yield an interferogram combining static and dynamic dichroism interferograms. Reference signals respectively in phase and quadrature with cyclic sample strain are derived from rheometer 102. At each OPD point of predetermined uninterrupted scans, controller 108 routes simultaneously a data point of the combined interferogram and the reference signals to respective channels of multiplexer 107. A microprocessor (shown elsewhere) subsequently performs a best-fit-to-an ellipse sorting of the data and for each OPD derives: A) the value of the interferogram unaffected by sample modulation; B) the corresponding in phase term; and C) the corresponding in quadrature term; furthermore, from the A, B,C data-point series it generates the interferogram of each series and transforms it into a spectrum. DIRLD analysis is achieved asynchronously and in continuous fast scanning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.