Method and apparatus for AC Differential thermal analysis
US5439291A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1993 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Dec 22, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N25/4866
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention is a modulated differential thermal analysis technique for determining the composition, phase, structure, identification, or other properties of a material that undergoes a transition as function of temperature or other driving variable. As applied to differential scanning calorimetric analysis (DSC), the preferred embodiment comprises (1) heating a sample of the material with a linear temperature ramp that is modulated with a sinusoidal heating rate oscillation; (2) simultaneously heating a reference at the same linear temperature ramp; (3) measuring the differential temperature of the sample and reference; and (4) deconvoluting the resultant heat flow signal into rapidly and non-rapidly reversible components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.