Thursday 9 September 2021 | British Motor Museum | Gaydon

New non-contact Extensometer launched by Make Measurement Matter exhibitor

Recently introduced by Make Measurement Matter exhibitor Tinius Olsen is the Epsilon ONE, a new optical, non-contact extensometer that provides high-accuracy, high-resolution, non-contacting axial strain and displacement measurement. The unit uses video to measure strain, and the company states that the Epsilon ONE is unique in its ease of use for efficient materials testing. The new machine is likely to be a focal point of discussion at the forthcoming Make Measurement Matter event, held in association with the GTMA at the British Motor Museum near Warwick on March 12th.

Tinius Olsen says that the new machine is suitable for testing high-modulus materials including metals, composites and higher-elongation materials, as well as thin or delicate specimens. It can also be used to test for cyclic fatigue, strain controlled testing, deflectometer applications and measuring crack opening displacements. The company says that class-leading accuracy and resolution are achieved by Epsilon’s comprehensive optical path optimisation, thanks to a unification of several optical technologies together with complex signal processing algorithms. 

Epsilon ONE, says Tinius Olsen, offers ultra-high camera resolution, with real-time data rates up to 3000Hz, together with the minimisation of optical error sources and the delivery of high strain resolution and accuracy with the lowest noise. 

Strain or extension is measured and output in real time. Epsilon ONE’s high resolution and ISO 0,5 / ASTM B-1 accuracy make it suitable for non-contact measurement of a wide range of strain values, from very small strains required to measure the modulus of metals, composites, ceramics and CMCs through to elastomers and much in between. 

The company further states that the Epsilon ONE is straightforward to use, and doesn’t have to be started and stopped for each specimen tested, like most video extensometers and DIC systems do. With its Laser-Assist alignment system providing instant alignment and distance spot checks, the machine uses tele-centric lenses to eliminate errors due to out-of-plane movements on low strain materials and components.

Many applications across industry involve specimens that straighten, or grips that are free to align under tensile loading. Unlike conventional lenses, tele-centric lenses such as those used in Epsilon ONE are insensitive to potential inaccuracies caused by these out-of-plane motions. With a tele-centric lens, the image of a test specimen seen by the camera’s sensor is the same size even if the specimen moves closer to, or further away from, the Optics Package.

This gives the benefit of maintaining full strain measurement accuracy, even if the specimen or grips move “out of plane” during the test. The company states that this is a key differentiator between Epsilon ONE and alternative equipment. This new machine, together with many others in the extensive  Tinius Olsen testing range, can be discussed at the forthcoming Make Measurement Matter event.


Make Measurement Matter is backed by the GTMA and showcases the latest advances in metrology and measurement excellence for manufacturing industry. This one-day opportunity provides senior engineers with a platform to meet and talk with some of the most experienced metrology and measurement technologists and application experts in the country. 

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