Thin strain gages

Strain Gages. Strain gages are used to measure the strain or elongation caused by the stress on a material. They are usually made of a thin foil grid laid on a plastic support as shown in Figure 4-259. They are the size of a small postal stamp and are glued to the structure to be stressed. 

Wermelinger T, Charpentier C, Yuzsek MD, Spolanek R (2009) Measuring stresses in thin metal films by means of Raman microscopy using silicon as a strain gage material. J Raman Spectrosc 40 1849-1857... 

Fig. 7.4.3 Measuring principle of steel diaphragm (in this case with thin-film strain gages)...

Placing strain gages on steel diaphragms can be done in several ways. In automotive applications up to 2000 bar three different technologies are widely used thin-film technology, microfused silicon strain gages, and a fused single chip (Fig. 7.4.5). 

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