Simultaneous measurement of strain and temperature was demonstrated by using a long-period fiber grating inscribed on a polarization-maintaining fiber (PM-LPG). The spectral sensitivities of the two adjacent resonant dips of the PM-LPG were measured with respect to strain and temperature. The sensitivities of each resonant dip for strain and temperature were different in magnitude and sign, which makes this PM-LPG have a capability of simultaneously sensing strain and temperature. Experimental results show root mean square deviations of 15.6 μ/spl epsiv/ and 0.7/spl deg/C for strain and temperature, respectively.
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Han et al. (2004) studied this question.