Abstract
A simultaneous interrogation technique of a hybrid fiber Bragg grating
(FBG) and long-period grating (LPG) sensor pair is proposed and demonstrated
using a monolithically integrated echelle diffractive grating (EDG). The operation
principle that is based on the monotonic temperature dependence of the EDG
transmission wavelengths is presented. Initial results show that a 1-pm resolution
and 24-nm interrogation range are achieved by using the proposed interrogation
technique, which can effectively be implemented to interrogate hybrid FBG/LPG-based
sensor pairs for the discrimination of refractive index (RI)/temperature in
RI measurement. The specially designed EDG-based interrogator has the added
features of low cost and compact size.
© 2009 IEEE
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