Floriane Soulas, who serves as a Test Engineer within Sopemea’s measuring department, spoke at the European Test and Telemetry Conference (EETC) – the annual international conference dedicated to the field of testing, instrumentation, measurement, telemetry, global flight tracking etc.

This year’s conference was held in Toulouse on June 13th-15th 2017 and focused on the ‘Internet of Things’ and ‘Big Data’ and how they may impact the testing community.

Sopemea’s paper on the stereo-correlation of digital images was chosen among 65 technical presentations previously selected for the European Test and Telemetry Conference (ETTC). The analyses derived from the DICCIT – FUI (government-funded) ASTech centre project – conducted in partnership with ENS Cachan, Airbus Group Innovation and Safran Landing Systems (among others), were considered by the international programme committee to be of particular interest, notably for developments in the field of stereo image correlation.

Measurement using stereo-digital image correlation
Four years ago, the Sopemea group embarked upon a collaborative research project designed to develop stereo-digital image correlation and to encourage the application of this technology within industry. The objective: to calculate structure distortion and analyse its transformation when subjected to a given weight or constraint.

Stereo-digital image correlation is a displacement measurement technique that has already been widely used in research laboratories over the past 20 years. Stereo-image correlation is an optical, fast, non-destructive, non-intrusive measurement tool offering many advantages compared to traditional sensors, particularly as it offers multiple displacement fields rather than single point values. The calculation/test comparisons are also more exhaustive, as stereo-digital image correlation superimposes the test and simulation results on full surfaces. 

View our video on stereo-correlation measurement.

However, while stereo-digital image correlation is widely used in laboratories and academic research, the adoption of the technology in industry – where the controlled laboratory environment is not usually the norm – is proving to be slow. The paper put forward for the ETTC 2017 conference explores the possibility of avoiding speckles when the surfaces under investigation are sufficiently heterogeneous and contrasted. This is of particular interest in cases where structures cannot be painted (inaccessible or difficult to instrumentalise). Dynamic vibration tests have also been conducted as part of a broader initiative designed to explore the limits of the methodology, including speckle-free tests.

The European Test and Telemetry Conference (ETTC) provides a venue for industry professionals to discover new standards, to improve their knowledge of other sectors and to meet new suppliers. Since 1985, ETTC has been run jointly by 3AF and SEE, in liaison with the Arbeitskreis Telemetrie EV in Germany and the International Foundation for Telemetering in the United States. The ETTC conference is held in France every two years (in odd-numbered years); in even-numbered years, the ETC conference is held in Germany.

More information on: www.ettc2017.org