Work Package 3:  Development of reference materials

 

The requirement was to develop a traceable physical reference material that can be used to calibrate optical instruments used for strain measurement both during their manufacture and their use in-service together with a complementary virtual (or digital) reference material.  Together the physical and virtual reference materials are intended provide a means of calibrating a complete system for optical strain measurement.  Traceability to the international standards is provided via a continuous chain of comparisons to the primary standard for the metre.

 

For more background on the philosophy and methodology behind the development of the reference materials see following three papers presented at the 12th Int. Conf. on Experimental Mechanics in Bari, Italy in 2004.

 

·       CLASSIFICATION OF OPERATIONS AND PROCESSES IN OPTICAL STRAIN MEASUREMENT
Richard Burguete, Erwin Hack, Malgorzata Kujawinska, Eann Patterson

·       CANDIDATE REFERENCE MATERIALS FOR OPTICAL STRAIN MEASUREMENT
Richard Burguete, Erwin Hack, Thorsten Siebert, Eann Patterson, Maurice Whelan

·       TRACEABILITY, REFERENCE MATERIALS AND STANDARDISED TESTS IN OPTICAL STRAIN MEASUREMENT
Erwin Hack, Graham Sims, David Mendels

 

Standardised tests that allow the fitness for purpose of an optical system of strain measurement have also been developed.  The standardised tests involve more complex strain distributions that facilitate the evaluation of optical strain measurement systems.

 

SPOTS Standard for calibration and assessment of optical strain measurement

 

The reference materials are specified together with methodologies for their use in Part I of the SPOTS Standard for Calibration and Assessment of Optical Strain Measurement.  Part II of the same document describes the design and methodology for use of two standardised tests for the evaluation of optical systems for measuring strain.  SPOTS consortium accepts no liability arising from the use of these documents and the designs and methodologies described in them, however the documents are freely available for use and adoption by individuals or organisations.

 

CAD drawings for the reference materials and standardised tests can be obtained from the project co-ordinator.  Sale of the materials produced based on or using the designs is prohibited without the written permission of the project co-ordinator.

 

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