Abstract
An alternative solution for the simultaneous measurement of temperature and
refractive index is presented. A local micro-structured fiber Bragg grating (LMSFBG)
is formed as the sensing head, in which a standard grating is etched by HF.
According to the phase shift theory, the main spectral change of the LMSFBG is the
formation of a narrow allowed band, which is strongly dependent on the etching
features and the surrounding refractive index. As such, the temperature and
refractive index measurements can be achieved by the shifts of the double peaks and
narrow allowed band, and their fitting linearity coefficients are 0.996 and 0.994,
respectively. Thus, the reflection and transmission peaks of the LMSFBG have a good
linear relationship with temperature and refractive index.
© 2012 Chinese Optics Letters
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