Encapsulated strain gauge - TSM
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The suitability of a strain gauge pattern for a specific application will be dependent on the gauge resistance and type of stress analysis required. Gauge resistances are typically 120ohms, 350ohms and 1000ohms. Higher resistance gauges can use higher bridge voltages, generate higher output signals and reduce heat generation rates and lead wire effects. Single grid gauges are used in circumstances where uni-axial stress states exist and the principle axes are known. Two element grids are used in a bi-axial stress state where the principle axes are known, and three element grids are used in a bi-axial stress state where the principle axes are unknown. Gauge length is the length of the gauge grid that is sensitive to strain and which measures the average strain over the area of the grid. If an average value is required then a long strain gauge should be utilized. For homogeneous materials, the length of the gauge is determined by the available space, ease of handling and application.
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