Zwick’s latest non-contact extensometer is cool

Strain measurement using laser extensometry in a temperature chamber

Lorsch, (PresseBox) - laserXtens, Zwick’s latest strain measurement system has successfully been used for applications in temperature chambers where materials are typically exposed to temperatures from -70 to +250°C whilst being subjected to tensile or compressive loads.

Such tests are very important for the automotive industry where the measurement of both axial and transverse strain is often required. laserXtens measures bi-axial strain without any specimen contact and without the need to attach any marks to the specimen. Part of the specimen surface is illuminated using the principle of laser speckle interferometry. As the specimen is subjected to load the reflected speckle pattern is tracked by two digital cameras, and highly advanced real-time software algorithms convert this data directly into strain.

The tests carried out in the temperature chamber revealed that this measurement technology was not adversely affected by the thin layer of frost which had formed on the specimen. The speckle pattern was easily detected and could be tracked during the tests.

Only a window is required in order for laserXtens to "see" the specimen inside the temperature chamber so laserXtens offers significant benefits in terms of its ease of use. Meeting class 1 of ISO 9513 (class B2 – ASTM E83) the extensometer remains outside the testing environment and measures strain up to failure. Zwick believes that this device will revolutionize the measurement of strain on specimens under environmental conditions.

Zwick GmbH & Co. KG

About the Zwick Roell Group Zwick Roell Group customers benefit from more than 150 years of experience in the manufacturing of high quality testing systems. Zwick is the global leader in static testing and is experiencing significant growth with its dynamic test systems. A financially strong and family run business, its innovative product developments, diverse product range, and global support provide tailored solutions targeted specifically at the needs of both Research and Development and Quality Assurance customers. Serving more than 20 industry sectors with 960 employees, via manufacturing facilities in Germany, regional headquarters in Atlanta, Georgia, USA and Singapore, as well as offices in 56 countries worldwide, the brand name Zwick is a guarantee of the highest quality and support. For more information see:

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