EXTENSOMETER

High Performance Extensometers to Meet a Great Variety of Materials Testing Needs

Extensometers are available to cover full scale elongations from 0.01 to 20 inches (0.25 mm to 0.5 m), in gage lengths from 0.25 to 20 inches (6 mm to 500 mm).  They cover temperatures from -265°C to +1600°C, and are available with or without electronics.

Extensometers are included for almost all engineering materials, including: elastomers, plastics, composites, metals, ceramics, geomaterials (e.g. rock, concrete, and asphalt), and biomaterials including bone.  There are models for tiny and delicate samples, including relatively fine wire, up to massive metal samples and large rock cores.

The huge variety of models covers nearly every type of test as well, including: tensile, compression, bend, fracture mechanics, and cyclic strain controlled tests like low cycle fatigue.  Most extensometers are capable of relatively high frequency operation.

Each extensometer carries a full year warranty. Strain measurement for materials testing is our sole business.

For ASTM E83, all will meet class B-1, except for a couple of special models, which meet class B-2. For ISO 9513, Epsilon’s extensometers meet class 0,5. Many extensometers regularly achieve a linearity better than 0.1% when calibrated at the factory.

All units ship with a certificate of accuracy, traceable to NIST. Each is individually calibrated, with relevant data provided.

The Videoextensometer ME 46™

This is used in a wide assortment of applications. Very important is the ability to measure strain contactless and the possibility for the user to watch the test cylce on the screen.

The Videoextensometer ME46™ persuades in security and  low maintenance. It enables measurements on "difficult" materials. For example very fine materials with small width, like thin foils or materials which suddenly explode elastically under high energy. When contact extensometers can be harmed due to break shocks the Videoextensometer ME46™ measures until break. Additionally the Videoextensometer ME 46™ can be used together with temperature chambers.

During watching the images on the screen the Videoextensometer ME46™ software can record an image sequence and evaluate it again afterwards. 

The Videoextensometer ME 46™ can also be used for your very special application which is maybe not written in this small introductions. Please contact your MESSPHYISK representative or directly MESSPHYSIK and inform you about additional applications.

Advantages 

The contactless measurement enables various advantages: 
Strain measurement at special materials (Safety belts, ropes of steel, ropes of rubber, thin wires, and many more)
Watching the specimen through a glass of  a temperature chamber
Freely choice of the gauge length
optional: Detection of transversal strain,  poisson ration (limited to class 1 measurement) and plastical anisotropy
optional: automatic search and measurement of necking and detection of the true stress


Due to its great ablility to process full frames the Videoextensometer ME46 is used for over 600 applications worldwide.

The Laser Speckle Extensometer ME53™ 

from MESSPHYSIK is a contactless strain measurement system that enables contactless measurement of surface movements on nearly every kind of material using laser diodes to enlight the samples surfaces. The Laser Speckle Extensometer ME53™ is compatible with all testing machines of different companies and can be connected digitally or analog. Due to using very low laser power (1mW) the system ist described as a class 2 laser system and doesn't have special safety requirements against laser light.

Raw or smooth surfaces, ambient light sources close by specimens, high or low specimen temperatures do not disturb the Laser Speckle Extensometers measurement. That's why the Laser Speckle Extensometer is a very powerful all purpose strain measurement system.

Since there are no markers required when using the Laser Speckle Extensometer it's specially suitable for high temperature tests (up to 1600°C) and in automated testing centers.

Technical data:

Strain measurement system class 1 - ISO 9513                                                                 
CCD or CMOS 2D cameras mesauring the deflection of the specimens surface
Realtime measurement of longitudinal- and transversal strain 
Resolution of a surface shifting at 0,1µm
Resolution of strain measurement is 0.0002 % at gauge length 50mm