Abstract

The differential modulation of the attenuation bands in a long-period grating is used for simultaneous sensing of axial strain and temperature. A grating fabricated in a conventional optical fiber is demonstrated for concurrent measurements of strain over a range of 2100 µ and temperature over a range of 125  °C, with maximum errors of 58 µ and 1  °C, respectively.

© 1997 Optical Society of America

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