User Manual

Introduction
Fundamental Video Extensometer
13
Video Extensometer
Introduction
The video extensometer is available in models for the simple longitudinal strain
to the advanced PRO and DEV models that integrate a machine control system.
This no-contact system of mechanical tests use video for the analysis of
polymers, elastomers, metals strains, and so forth.
Version LC X allow you to measure longitudinal strain. Version LC XY allows
you to measure transverse strain. Version LC XY-b allows you to determine the
volumetric strain.
These versions are installed on the computer provided with your tensile testing
machine and are well adapted for large strains and tests at high or low
temperature.
The principle of measurement is the following-up in real time of the barycenter
position of the markers laid out on the tensile specimen.
The system deduces the strains from the markers (
ε1 and/or ε2) and sends
information to the control machine software either by a RS232 connection or by
transmitting +/- 10 V signal.
Components
Models
*
* X = Standard; O = Optional; U= Unavailable
DEV PRO LC X LC XY LC XY-b
Video acquisition board X X X X X
Video camera X X X X X
Standard lens X X X X X
Extension bellow X X O O O
Zoom lens X X O O O
Telescopic column X X O O O
Photo foot U U X X X
Control board X X U U U
Analog output board 0-10V U U X X X
Fluorescent Lamp X X O O O
2 markers control X X X X X
4 markers control X X U X X
5 markers control X X U U U
7 markers control X U O U X