The subject of strain measurement has previously been addressed extensively. Most of the existing transducers either rely on low voltage analogue systems (e.g. conventional resistive strain gauge), complicated mechanical assemblies by physically assessing the specimen displacement, optical systems, acoustic systems or pneumatic systems.
This paper identifies a new, potentially low cost, non-contact, frequency domain strain sensor utilising SAW (Surface Acoustic Wave) Technology for surface strain measurement. The sensor has a short axial length making it flexible in terms of integration into a variety of applications, encompassing both static and dynamic strain measurement. The paper presents a technical description of the resulting strain transducer, regarding its operation, construction and in particularly, application to areas requiring strain measurement. Demonstration of the transducer performance will be addressed utilising test results from existing developed transducers.