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Chapter 3 – Raman Spectroscopy of Graphene and Graphene-based Strain Sensors A video camera is normally used to image the fringe patterns (Figure 3.17d) that can reveal information related to orientation and principal stress/strain directions.328, 329 Figure 3.17: a) Schematic representation of reflection Polariscope. b) Application of strain sensitive photoelastic coatings on a complex part. c) Reflection Polariscope. d) Images from Polariscope of a product being incrementally loaded revealing the fringe patterns.328 Commercially available photoelasticity-based sensors like PhotoStress® (Vishay Precision Group)328 and Grey-field Polariscope (Stress Photonics)330, supply a photoelastic sensitive polymer coatings (PMMA/epoxy- or PS/epoxy-based) with a Polariscope for strain/stress analysis. The advantages of this type of sensors are: Full field strain/stress maps with stress distributions can be obtained in real time Strain/stress levels in complex parts can be imaged (Figure 3.17b) Relatively simple to use The accuracy of these sensors is about 0.1 % and the resolutions ranging from 10 – 20 μ𝜀. However, one of the disadvantages is in the slightly complex coating application process on the target substrate. Nevertheless, this technique is suitable for wide-area strain sensing applications due to their simplicity and flexibility. 100PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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