Strain gauge developments from HBM
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HBM has now developed its K-OP type optical strain gauges (SGs) even further so that they offer several decisive advantages compared with electrical SGs.
They are now ideally suited to material tests of new fiber composites. Tests with up to 10 million load cycles with an alternating strain of 5.000µm/m are now possible.
The K-OP type optical SGs are based on so-called fiber Bragg gratings. As the strain is measured purely optically, an electric signal is not necessary. This makes utilization in explosive atmospheres, electro-magnetic interferences or even high voltage applications possible without difficulties, say the makers. In addition, several optical SGs can be attached to a fiber, enabling implementation of parallel measurements. Glass fiber lengths of several hundred meters are possible.
The user receives a data sheet with the optical strain gages, which amongst other things includes the important gage factor of each individual SG, already tested by HBM according to the new VDI/VDE2660 requirements.
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