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6 June 1997 Simultaneous strain and temperature sensing using long-period gratings
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We present experimental results to demonstrate the simultaneous strain and temperature measurement capability of long-period gratings. It is shown that the distinct spectral shifts of the multiple resonance bands in a single grating can be employed to separate the concurrent perturbations of axial strain and temperature. Static and quasi-static tests are performed to illustrate the effectiveness of a grating written in a standard optical fiber. It is demonstrated that cross-sensitivities and non- linearities in the temperature- and strain-induced shifts result in a tradeoff between the simplicity and the dynamic range of the sensing system. The advantages and limitations of the long-period grating simultaneous sensing configurations are also discussed.
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Vikram Bhatia, David K. Campbell, Daniel Sherr, and Richard O. Claus "Simultaneous strain and temperature sensing using long-period gratings", Proc. SPIE 3042, Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation, (6 June 1997);

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