Dynamic and thermal mechanical analyzer having an optical encoder with diffraction grating and a linear permanent magnet motor
US5710426A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1996 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Mar 1, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0226
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A dynamic and thermal mechanical analyzer incorporating a slide driven vertically in an air bearing guidance system with a large displacement capacity, very low friction and low mass. The position of the slide is measured by digitizing and interpolating two quadrature output signals generated by an optical encoder with very high spatial resolution and a long stroke. A force is applied to the slide using a linear permanent magnet motor with high force, high force linearity and low sensitivity to temperature variations. Position signals derived from the digitized and interpolated quadrature output signals are analyzed as a function of the applied force to calculate viscoelastic properties of a sample of material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.