 |
 |
 |
 |
Journal articles
Zero applied stress rheometer
Abstract : In order to test the fluctuation-dissipation relation on rheological properties of soft materials, we built an experiment to measure thermally excited strain in a sample and compare it to the classical response to an external stress. The rheometer is based on a cylindrical Couette geometry. We use differential interferometry to achieve better than 10(-10) rad/rootHz sensitivity in angular position above 0.5 Hz. The forcing method, based on electrostatic interaction in a capacitor, generates torques comparable to that of thermal noise. Experiments on a calibrated silicon oil show good agreement between response and fluctuation measurements.
https://hal-ens-lyon.archives-ouvertes.fr/ensl-00179779
Contributor : Ludovic Bellon <>
Submitted on : Tuesday, October 16, 2007 - 4:07:37 PM
Last modification on : Monday, November 30, 2020 - 12:24:01 PM
Contributor : Ludovic Bellon <>
Submitted on : Tuesday, October 16, 2007 - 4:07:37 PM
Last modification on : Monday, November 30, 2020 - 12:24:01 PM